js/util.js

   1 /*
   2  * StatusNet - a distributed open-source microblogging tool
   3  * Copyright (C) 2008, StatusNet, Inc.
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU Affero General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU Affero General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Affero General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * @category  UI interaction
  19  * @package   StatusNet
  20  * @author    Sarven Capadisli <csarven@status.net>
  21  * @author    Evan Prodromou <evan@status.net>
  22  * @author    Brion Vibber <brion@status.net>
  23  * @copyright 2009,2010 StatusNet, Inc.
  24  * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
  25  * @link      http://status.net/
  26  */
  27
  28 var SN = { // StatusNet
  29     C: { // Config
  30         I: { // Init
  31             CounterBlackout: false,
  32             MaxLength: 140,
  33             PatternUsername: /^[0-9a-zA-Z\-_.]*$/,
  34             HTTP20x30x: [200, 201, 202, 203, 204, 205, 206, 300, 301, 302, 303, 304, 305, 306, 307],
  35             NoticeFormMaster: null // to be cloned from the one at top
  36         },
  37
  38         /**
  39          * @fixme are these worth the trouble? They seem to mostly just duplicate
  40          * themselves while slightly obscuring the actual selector, so it's hard
  41          * to pop over to the HTML and find something.
  42          *
  43          * In theory, minification could reduce them to shorter variable names,
  44          * but at present that doesn't happen with yui-compressor.
  45          */
  46         S: { // Selector
  47             Disabled: 'disabled',
  48             Warning: 'warning',
  49             Error: 'error',
  50             Success: 'success',
  51             Processing: 'processing',
  52             CommandResult: 'command_result',
  53             FormNotice: 'form_notice',
  54             NoticeDataGeo: 'notice_data-geo',
  55             NoticeDataGeoCookie: 'NoticeDataGeo',
  56             NoticeDataGeoSelected: 'notice_data-geo_selected',
  57             StatusNetInstance:'StatusNetInstance'
  58         }
  59     },
  60
  61     /**
  62      * Map of localized message strings exported to script from the PHP
  63      * side via Action::getScriptMessages().
  64      *
  65      * Retrieve them via SN.msg(); this array is an implementation detail.
  66      *
  67      * @access private
  68      */
  69     messages: {},
  70
  71     /**
  72      * Grabs a localized string that's been previously exported to us
  73      * from server-side code via Action::getScriptMessages().
  74      *
  75      * @example alert(SN.msg('coolplugin-failed'));
  76      *
  77      * @param {String} key: string key name to pull from message index
  78      * @return matching localized message string
  79      */
  80     msg: function(key) {
  81         if (typeof SN.messages[key] == "undefined") {
  82             return '[' + key + ']';
  83         } else {
  84             return SN.messages[key];
  85         }
  86     },
  87
  88     U: { // Utils
  89         /**
  90          * Setup function -- DOES NOT trigger actions immediately.
  91          *
  92          * Sets up event handlers on the new notice form.
  93          *
  94          * @param {jQuery} form: jQuery object whose first matching element is the form
  95          * @access private
  96          */
  97         FormNoticeEnhancements: function(form) {
  98             if (jQuery.data(form[0], 'ElementData') === undefined) {
  99                 MaxLength = form.find('.count').text();
 100                 if (typeof(MaxLength) == 'undefined') {
 101                      MaxLength = SN.C.I.MaxLength;
 102                 }
 103                 jQuery.data(form[0], 'ElementData', {MaxLength:MaxLength});
 104
 105                 SN.U.Counter(form);
 106
 107                 NDT = form.find('.notice_data-text:first');
 108
 109                 NDT.bind('keyup', function(e) {
 110                     SN.U.Counter(form);
 111                 });
 112
 113                 var delayedUpdate= function(e) {
 114                     // Cut and paste events fire *before* the operation,
 115                     // so we need to trigger an update in a little bit.
 116                     // This would be so much easier if the 'change' event
 117                     // actually fired every time the value changed. :P
 118                     window.setTimeout(function() {
 119                         SN.U.Counter(form);
 120                     }, 50);
 121                 };
 122                 // Note there's still no event for mouse-triggered 'delete'.
 123                 NDT.bind('cut', delayedUpdate)
 124                    .bind('paste', delayedUpdate);
 125             }
 126             else {
 127                 form.find('.count').text(jQuery.data(form[0], 'ElementData').MaxLength);
 128             }
 129         },
 130
 131         /**
 132          * To be called from event handlers on the notice import form.
 133          * Triggers an update of the remaining-characters counter.
 134          *
 135          * Additional counter updates will be suppressed during the
 136          * next half-second to avoid flooding the layout engine with
 137          * updates, followed by another automatic check.
 138          *
 139          * The maximum length is pulled from data established by
 140          * FormNoticeEnhancements.
 141          *
 142          * @param {jQuery} form: jQuery object whose first element is the notice posting form
 143          * @access private
 144          */
 145         Counter: function(form) {
 146             SN.C.I.FormNoticeCurrent = form;
 147
 148             var MaxLength = jQuery.data(form[0], 'ElementData').MaxLength;
 149
 150             if (MaxLength <= 0) {
 151                 return;
 152             }
 153
 154             var remaining = MaxLength - SN.U.CharacterCount(form);
 155             var counter = form.find('.count');
 156
 157             if (remaining.toString() != counter.text()) {
 158                 if (!SN.C.I.CounterBlackout || remaining === 0) {
 159                     if (counter.text() != String(remaining)) {
 160                         counter.text(remaining);
 161                     }
 162                     if (remaining < 0) {
 163                         form.addClass(SN.C.S.Warning);
 164                     } else {
 165                         form.removeClass(SN.C.S.Warning);
 166                     }
 167                     // Skip updates for the next 500ms.
 168                     // On slower hardware, updating on every keypress is unpleasant.
 169                     if (!SN.C.I.CounterBlackout) {
 170                         SN.C.I.CounterBlackout = true;
 171                         SN.C.I.FormNoticeCurrent = form;
 172                         window.setTimeout("SN.U.ClearCounterBlackout(SN.C.I.FormNoticeCurrent);", 500);
 173                     }
 174                 }
 175             }
 176         },
 177
 178         /**
 179          * Pull the count of characters in the current edit field.
 180          * Plugins replacing the edit control may need to override this.
 181          *
 182          * @param {jQuery} form: jQuery object whose first element is the notice posting form
 183          * @return number of chars
 184          */
 185         CharacterCount: function(form) {
 186             return form.find('.notice_data-text:first').val().length;
 187         },
 188
 189         /**
 190          * Called internally after the counter update blackout period expires;
 191          * runs another update to make sure we didn't miss anything.
 192          *
 193          * @param {jQuery} form: jQuery object whose first element is the notice posting form
 194          * @access private
 195          */
 196         ClearCounterBlackout: function(form) {
 197             // Allow keyup events to poke the counter again
 198             SN.C.I.CounterBlackout = false;
 199             // Check if the string changed since we last looked
 200             SN.U.Counter(form);
 201         },
 202
 203         /**
 204          * Helper function to rewrite default HTTP form action URLs to HTTPS
 205          * so we can actually fetch them when on an SSL page in ssl=sometimes
 206          * mode.
 207          *
 208          * It would be better to output URLs that didn't hardcode protocol
 209          * and hostname in the first place...
 210          *
 211          * @param {String} url
 212          * @return string
 213          */
 214         RewriteAjaxAction: function(url) {
 215             // Quick hack: rewrite AJAX submits to HTTPS if they'd fail otherwise.
 216             if (document.location.protocol == 'https:' && url.substr(0, 5) == 'http:') {
 217                 return url.replace(/^http:\/\/[^:\/]+/, 'https://' + document.location.host);
 218             } else {
 219                 return url;
 220             }
 221         },
 222
 223         /**
 224          * Grabs form data and submits it asynchronously, with 'ajax=1'
 225          * parameter added to the rest.
 226          *
 227          * If a successful response includes another form, that form
 228          * will be extracted and copied in, replacing the original form.
 229          * If there's no form, the first paragraph will be used.
 230          *
 231          * This will automatically be applied on the 'submit' event for
 232          * any form with the 'ajax' class.
 233          *
 234          * @fixme can sometimes explode confusingly if returnd data is bogus
 235          * @fixme error handling is pretty vague
 236          * @fixme can't submit file uploads
 237          *
 238          * @param {jQuery} form: jQuery object whose first element is a form
 239          *
 240          * @access public
 241          */
 242         FormXHR: function(form) {
 243             $.ajax({
 244                 type: 'POST',
 245                 dataType: 'xml',
 246                 url: SN.U.RewriteAjaxAction(form.attr('action')),
 247                 data: form.serialize() + '&ajax=1',
 248                 beforeSend: function(xhr) {
 249                     form
 250                         .addClass(SN.C.S.Processing)
 251                         .find('.submit')
 252                             .addClass(SN.C.S.Disabled)
 253                             .attr(SN.C.S.Disabled, SN.C.S.Disabled);
 254                 },
 255                 error: function (xhr, textStatus, errorThrown) {
 256                     alert(errorThrown || textStatus);
 257                 },
 258                 success: function(data, textStatus) {
 259                     if (typeof($('form', data)[0]) != 'undefined') {
 260                         form_new = document._importNode($('form', data)[0], true);
 261                         form.replaceWith(form_new);
 262                     }
 263                     else {
 264                         form.replaceWith(document._importNode($('p', data)[0], true));
 265                     }
 266                 }
 267             });
 268         },
 269
 270         /**
 271          * Setup function -- DOES NOT trigger actions immediately.
 272          *
 273          * Sets up event handlers for special-cased async submission of the
 274          * notice-posting form, including some pre-post validation.
 275          *
 276          * Unlike FormXHR() this does NOT submit the form immediately!
 277          * It sets up event handlers so that any method of submitting the
 278          * form (click on submit button, enter, submit() etc) will trigger
 279          * it properly.
 280          *
 281          * Also unlike FormXHR(), this system will use a hidden iframe
 282          * automatically to handle file uploads via <input type="file">
 283          * controls.
 284          *
 285          * @fixme tl;dr
 286          * @fixme vast swaths of duplicate code and really long variable names clutter this function up real bad
 287          * @fixme error handling is unreliable
 288          * @fixme cookieValue is a global variable, but probably shouldn't be
 289          * @fixme saving the location cache cookies should be split out
 290          * @fixme some error messages are hardcoded english: needs i18n
 291          * @fixme special-case for bookmarklet is confusing and uses a global var "self". Is this ok?
 292          *
 293          * @param {jQuery} form: jQuery object whose first element is a form
 294          *
 295          * @access public
 296          */
 297         FormNoticeXHR: function(form) {
 298             SN.C.I.NoticeDataGeo = {};
 299             form.append('<input type="hidden" name="ajax" value="1"/>');
 300
 301             // Make sure we don't have a mixed HTTP/HTTPS submission...
 302             form.attr('action', SN.U.RewriteAjaxAction(form.attr('action')));
 303
 304             /**
 305              * Show a response feedback bit under the new-notice dialog.
 306              *
 307              * @param {String} cls: CSS class name to use ('error' or 'success')
 308              * @param {String} text
 309              * @access private
 310              */
 311             var showFeedback = function(cls, text) {
 312                 form.append(
 313                     $('<p class="form_response"></p>')
 314                         .addClass(cls)
 315                         .text(text)
 316                 );
 317             };
 318
 319             /**
 320              * Hide the previous response feedback, if any.
 321              */
 322             var removeFeedback = function() {
 323                 form.find('.form_response').remove();
 324             };
 325
 326             form.ajaxForm({
 327                 dataType: 'xml',
 328                 timeout: '60000',
 329                 beforeSend: function(formData) {
 330                     if (form.find('.notice_data-text:first').val() == '') {
 331                         form.addClass(SN.C.S.Warning);
 332                         return false;
 333                     }
 334                     form
 335                         .addClass(SN.C.S.Processing)
 336                         .find('.submit')
 337                             .addClass(SN.C.S.Disabled)
 338                             .attr(SN.C.S.Disabled, SN.C.S.Disabled);
 339
 340                     SN.U.normalizeGeoData(form);
 341
 342                     return true;
 343                 },
 344                 error: function (xhr, textStatus, errorThrown) {
 345                     form
 346                         .removeClass(SN.C.S.Processing)
 347                         .find('.submit')
 348                             .removeClass(SN.C.S.Disabled)
 349                             .removeAttr(SN.C.S.Disabled, SN.C.S.Disabled);
 350                     removeFeedback();
 351                     if (textStatus == 'timeout') {
 352                         // @fixme i18n
 353                         showFeedback('error', 'Sorry! We had trouble sending your notice. The servers are overloaded. Please try again, and contact the site administrator if this problem persists.');
 354                     }
 355                     else {
 356                         var response = SN.U.GetResponseXML(xhr);
 357                         if ($('.'+SN.C.S.Error, response).length > 0) {
 358                             form.append(document._importNode($('.'+SN.C.S.Error, response)[0], true));
 359                         }
 360                         else {
 361                             if (parseInt(xhr.status) === 0 || jQuery.inArray(parseInt(xhr.status), SN.C.I.HTTP20x30x) >= 0) {
 362                                 form
 363                                     .resetForm()
 364                                     .find('.attach-status').remove();
 365                                 SN.U.FormNoticeEnhancements(form);
 366                             }
 367                             else {
 368                                 // @fixme i18n
 369                                 showFeedback('error', '(Sorry! We had trouble sending your notice ('+xhr.status+' '+xhr.statusText+'). Please report the problem to the site administrator if this happens again.');
 370                             }
 371                         }
 372                     }
 373                 },
 374                 success: function(data, textStatus) {
 375                     removeFeedback();
 376                     var errorResult = $('#'+SN.C.S.Error, data);
 377                     if (errorResult.length > 0) {
 378                         showFeedback('error', errorResult.text());
 379                     }
 380                     else {
 381                         if($('body')[0].id == 'bookmarklet') {
 382                             // @fixme self is not referenced anywhere?
 383                             self.close();
 384                         }
 385
 386                         var commandResult = $('#'+SN.C.S.CommandResult, data);
 387                         if (commandResult.length > 0) {
 388                             showFeedback('success', commandResult.text());
 389                         }
 390                         else {
 391                             // New notice post was successful. If on our timeline, show it!
 392                             var notice = document._importNode($('li', data)[0], true);
 393                             var notices = $('#notices_primary .notices:first');
 394                             var replyItem = form.closest('li.notice-reply');
 395
 396                             if (replyItem.length > 0) {
 397                                 // If this is an inline reply, insert it in place.
 398                                 var id = $(notice).attr('id');
 399                                 if ($("#"+id).length == 0) {
 400                                     var parentNotice = replyItem.closest('li.notice');
 401                                     replyItem.replaceWith(notice);
 402                                     SN.U.NoticeInlineReplyPlaceholder(parentNotice);
 403                                 } else {
 404                                     // Realtime came through before us...
 405                                     replyItem.remove();
 406                                 }
 407                             } else if (notices.length > 0 && SN.U.belongsOnTimeline(notice)) {
 408                                 // Not a reply. If on our timeline, show it at the top!
 409
 410                                 if ($('#'+notice.id).length === 0) {
 411                                     var notice_irt_value = form.find('[name=inreplyto]').val();
 412                                     var notice_irt = '#notices_primary #notice-'+notice_irt_value;
 413                                     if($('body')[0].id == 'conversation') {
 414                                         if(notice_irt_value.length > 0 && $(notice_irt+' .notices').length < 1) {
 415                                             $(notice_irt).append('<ul class="notices"></ul>');
 416                                         }
 417                                         $($(notice_irt+' .notices')[0]).append(notice);
 418                                     }
 419                                     else {
 420                                         notices.prepend(notice);
 421                                     }
 422                                     $('#'+notice.id)
 423                                         .css({display:'none'})
 424                                         .fadeIn(2500);
 425                                     SN.U.NoticeWithAttachment($('#'+notice.id));
 426                                     SN.U.NoticeReplyTo($('#'+notice.id));
 427                                     SN.U.switchInputFormTab("placeholder");
 428                                 }
 429                             } else {
 430                                 // Not on a timeline that this belongs on?
 431                                 // Just show a success message.
 432                                 // @fixme inline
 433                                 showFeedback('success', $('title', data).text());
 434                             }
 435                         }
 436                         form.resetForm();
 437                         form.find('[name=inreplyto]').val('');
 438                         form.find('.attach-status').remove();
 439                         SN.U.FormNoticeEnhancements(form);
 440                     }
 441                 },
 442                 complete: function(xhr, textStatus) {
 443                     form
 444                         .removeClass(SN.C.S.Processing)
 445                         .find('.submit')
 446                             .removeAttr(SN.C.S.Disabled)
 447                             .removeClass(SN.C.S.Disabled);
 448
 449                     form.find('[name=lat]').val(SN.C.I.NoticeDataGeo.NLat);
 450                     form.find('[name=lon]').val(SN.C.I.NoticeDataGeo.NLon);
 451                     form.find('[name=location_ns]').val(SN.C.I.NoticeDataGeo.NLNS);
 452                     form.find('[name=location_id]').val(SN.C.I.NoticeDataGeo.NLID);
 453                     form.find('[name=notice_data-geo]').attr('checked', SN.C.I.NoticeDataGeo.NDG);
 454                 }
 455             });
 456         },
 457
 458         normalizeGeoData: function(form) {
 459             SN.C.I.NoticeDataGeo.NLat = form.find('[name=lat]').val();
 460             SN.C.I.NoticeDataGeo.NLon = form.find('[name=lon]').val();
 461             SN.C.I.NoticeDataGeo.NLNS = form.find('[name=location_ns]').val();
 462             SN.C.I.NoticeDataGeo.NLID = form.find('[name=location_id]').val();
 463             SN.C.I.NoticeDataGeo.NDG = form.find('[name=notice_data-geo]').attr('checked'); // @fixme
 464
 465             var cookieValue = $.cookie(SN.C.S.NoticeDataGeoCookie);
 466
 467             if (cookieValue !== null && cookieValue != 'disabled') {
 468                 cookieValue = JSON.parse(cookieValue);
 469                 SN.C.I.NoticeDataGeo.NLat = form.find('[name=lat]').val(cookieValue.NLat).val();
 470                 SN.C.I.NoticeDataGeo.NLon = form.find('[name=lon]').val(cookieValue.NLon).val();
 471                 if (cookieValue.NLNS) {
 472                     SN.C.I.NoticeDataGeo.NLNS = form.find('[name=location_ns]').val(cookieValue.NLNS).val();
 473                     SN.C.I.NoticeDataGeo.NLID = form.find('[name=location_id]').val(cookieValue.NLID).val();
 474                 } else {
 475                     form.find('[name=location_ns]').val('');
 476                     form.find('[name=location_id]').val('');
 477                 }
 478             }
 479             if (cookieValue == 'disabled') {
 480                 SN.C.I.NoticeDataGeo.NDG = form.find('[name=notice_data-geo]').attr('checked', false).attr('checked');
 481             }
 482             else {
 483                 SN.C.I.NoticeDataGeo.NDG = form.find('[name=notice_data-geo]').attr('checked', true).attr('checked');
 484             }
 485
 486         },
 487         /**
 488          * Fetch an XML DOM from an XHR's response data.
 489          *
 490          * Works around unavailable responseXML when document.domain
 491          * has been modified by Meteor or other tools, in some but not
 492          * all browsers.
 493          *
 494          * @param {XMLHTTPRequest} xhr
 495          * @return DOMDocument
 496          */
 497         GetResponseXML: function(xhr) {
 498             try {
 499                 return xhr.responseXML;
 500             } catch (e) {
 501                 return (new DOMParser()).parseFromString(xhr.responseText, "text/xml");
 502             }
 503         },
 504
 505         /**
 506          * Setup function -- DOES NOT trigger actions immediately.
 507          *
 508          * Sets up event handlers on all visible notice's reply buttons to
 509          * tweak the new-notice form with needed variables and focus it
 510          * when pushed.
 511          *
 512          * (This replaces the default reply button behavior to submit
 513          * directly to a form which comes back with a specialized page
 514          * with the form data prefilled.)
 515          *
 516          * @access private
 517          */
 518         NoticeReply: function() {
 519             if ($('#content .notice_reply').length > 0) {
 520                 $('#content .notice').each(function() { SN.U.NoticeReplyTo($(this)); });
 521             }
 522         },
 523
 524         /**
 525          * Setup function -- DOES NOT trigger actions immediately.
 526          *
 527          * Sets up event handlers on the given notice's reply button to
 528          * tweak the new-notice form with needed variables and focus it
 529          * when pushed.
 530          *
 531          * (This replaces the default reply button behavior to submit
 532          * directly to a form which comes back with a specialized page
 533          * with the form data prefilled.)
 534          *
 535          * @param {jQuery} notice: jQuery object containing one or more notices
 536          * @access private
 537          */
 538         NoticeReplyTo: function(notice) {
 539             notice.find('.notice_reply').live('click', function(e) {
 540                 e.preventDefault();
 541                 var nickname = ($('.author .nickname', notice).length > 0) ? $($('.author .nickname', notice)[0]) : $('.author .nickname.uid');
 542                 SN.U.NoticeInlineReplyTrigger(notice, '@' + nickname.text());
 543                 return false;
 544             });
 545         },
 546
 547         /**
 548          * Open up a notice's inline reply box.
 549          *
 550          * @param {jQuery} notice: jQuery object containing one notice
 551          * @param {String} initialText
 552          */
 553         NoticeInlineReplyTrigger: function(notice, initialText) {
 554             // Find the notice we're replying to...
 555             var id = $($('.notice_id', notice)[0]).text();
 556             var parentNotice = notice;
 557
 558             // Find the threaded replies view we'll be adding to...
 559             var list = notice.closest('.notices');
 560             if (list.hasClass('threaded-replies')) {
 561                 // We're replying to a reply; use reply form on the end of this list.
 562                 // We'll add our form at the end of this; grab the root notice.
 563                 parentNotice = list.closest('.notice');
 564             } else {
 565                 // We're replying to a parent notice; pull its threaded list
 566                 // and we'll add on the end of it. Will add if needed.
 567                 list = $('ul.threaded-replies', notice);
 568                 if (list.length == 0) {
 569                     list = $('<ul class="notices threaded-replies xoxo"></ul>');
 570                     notice.append(list);
 571                 }
 572             }
 573
 574             // See if the form's already open...
 575             var replyForm = $('.notice-reply-form', list);
 576
 577             var nextStep = function() {
 578                 // Override...?
 579                 replyForm.find('input[name=inreplyto]').val(id);
 580
 581                 // Set focus...
 582                 var text = replyForm.find('textarea');
 583                 if (text.length == 0) {
 584                     throw "No textarea";
 585                 }
 586                 var replyto = '';
 587                 if (initialText) {
 588                     replyto = initialText + ' ';
 589                 }
 590                 text.val(replyto + text.val().replace(RegExp(replyto, 'i'), ''));
 591                 text.data('initialText', $.trim(initialText + ''));
 592                 text.focus();
 593                 if (text[0].setSelectionRange) {
 594                     var len = text.val().length;
 595                     text[0].setSelectionRange(len,len);
 596                 }
 597             };
 598             if (replyForm.length > 0) {
 599                 // Update the existing form...
 600                 nextStep();
 601             } else {
 602                 // Remove placeholder if any
 603                 list.find('li.notice-reply-placeholder').remove();
 604
 605                 // Create the reply form entry at the end
 606                 var replyItem = $('li.notice-reply', list);
 607                 if (replyItem.length == 0) {
 608                     replyItem = $('<li class="notice-reply"></li>');
 609
 610                     var intermediateStep = function(formMaster) {
 611                         var formEl = document._importNode(formMaster, true);
 612                         replyItem.append(formEl);
 613                         list.append(replyItem);
 614
 615                         var form = replyForm = $(formEl);
 616                         SN.Init.NoticeFormSetup(form);
 617
 618                         nextStep();
 619                     };
 620                     if (SN.C.I.NoticeFormMaster) {
 621                         // We've already saved a master copy of the form.
 622                         // Clone it in!
 623                         intermediateStep(SN.C.I.NoticeFormMaster);
 624                     } else {
 625                         // Fetch a fresh copy of the notice form over AJAX.
 626                         // Warning: this can have a delay, which looks bad.
 627                         // @fixme this fallback may or may not work
 628                         var url = $('#form_notice').attr('action');
 629                         $.get(url, {ajax: 1}, function(data, textStatus, xhr) {
 630                             intermediateStep($('form', data)[0]);
 631                         });
 632                     }
 633                 }
 634             }
 635         },
 636
 637         NoticeInlineReplyPlaceholder: function(notice) {
 638             var list = notice.find('ul.threaded-replies');
 639             var placeholder = $('<li class="notice-reply-placeholder">' +
 640                                     '<input class="placeholder">' +
 641                                 '</li>');
 642             placeholder.find('input')
 643                 .val(SN.msg('reply_placeholder'))
 644                 .focus(function() {
 645                     SN.U.NoticeInlineReplyTrigger(notice);
 646                     return false;
 647                 });
 648             list.append(placeholder);
 649         },
 650
 651         /**
 652          * Setup function -- DOES NOT apply immediately.
 653          *
 654          * Sets up event handlers for favor/disfavor forms to submit via XHR.
 655          * Uses 'live' rather than 'bind', so applies to future as well as present items.
 656          */
 657         NoticeInlineReplySetup: function() {
 658             $('.threaded-replies').each(function() {
 659                 var list = $(this);
 660                 var notice = list.closest('.notice');
 661                 SN.U.NoticeInlineReplyPlaceholder(notice);
 662             });
 663         },
 664
 665         /**
 666          * Setup function -- DOES NOT trigger actions immediately.
 667          *
 668          * Sets up event handlers for repeat forms to toss up a confirmation
 669          * popout before submitting.
 670          *
 671          * Uses 'live' rather than 'bind', so applies to future as well as present items.
 672          */
 673         NoticeRepeat: function() {
 674             $('.form_repeat').live('click', function(e) {
 675                 e.preventDefault();
 676
 677                 SN.U.NoticeRepeatConfirmation($(this));
 678                 return false;
 679             });
 680         },
 681
 682         /**
 683          * Shows a confirmation dialog box variant of the repeat button form.
 684          * This seems to use a technique where the repeat form contains
 685          * _both_ a standalone button _and_ text and buttons for a dialog.
 686          * The dialog will close after its copy of the form is submitted,
 687          * or if you click its 'close' button.
 688          *
 689          * The dialog is created by duplicating the original form and changing
 690          * its style; while clever, this is hard to generalize and probably
 691          * duplicates a lot of unnecessary HTML output.
 692          *
 693          * @fixme create confirmation dialogs through a generalized interface
 694          * that can be reused instead of hardcoded text and styles.
 695          *
 696          * @param {jQuery} form
 697          */
 698         NoticeRepeatConfirmation: function(form) {
 699             var submit_i = form.find('.submit');
 700
 701             var submit = submit_i.clone();
 702             submit
 703                 .addClass('submit_dialogbox')
 704                 .removeClass('submit');
 705             form.append(submit);
 706             submit.bind('click', function() { SN.U.FormXHR(form); return false; });
 707
 708             submit_i.hide();
 709
 710             form
 711                 .addClass('dialogbox')
 712                 .append('<button class="close">&#215;</button>')
 713                 .closest('.notice-options')
 714                     .addClass('opaque');
 715
 716             form.find('button.close').click(function(){
 717                 $(this).remove();
 718
 719                 form
 720                     .removeClass('dialogbox')
 721                     .closest('.notice-options')
 722                         .removeClass('opaque');
 723
 724                 form.find('.submit_dialogbox').remove();
 725                 form.find('.submit').show();
 726
 727                 return false;
 728             });
 729         },
 730
 731         /**
 732          * Setup function -- DOES NOT trigger actions immediately.
 733          *
 734          * Goes through all notices currently displayed and sets up attachment
 735          * handling if needed.
 736          */
 737         NoticeAttachments: function() {
 738             $('.notice a.attachment').each(function() {
 739                 SN.U.NoticeWithAttachment($(this).closest('.notice'));
 740             });
 741         },
 742
 743         /**
 744          * Setup function -- DOES NOT trigger actions immediately.
 745          *
 746          * Sets up special attachment link handling if needed. Currently this
 747          * consists only of making the "more" button used for OStatus message
 748          * cropping turn into an auto-expansion button that loads the full
 749          * text from an attachment file.
 750          *
 751          * @param {jQuery} notice
 752          */
 753         NoticeWithAttachment: function(notice) {
 754             if (notice.find('.attachment').length === 0) {
 755                 return;
 756             }
 757
 758             var attachment_more = notice.find('.attachment.more');
 759             if (attachment_more.length > 0) {
 760                 $(attachment_more[0]).click(function() {
 761                     var m = $(this);
 762                     m.addClass(SN.C.S.Processing);
 763                     $.get(m.attr('href')+'/ajax', null, function(data) {
 764                         m.parent('.entry-content').html($(data).find('#attachment_view .entry-content').html());
 765                     });
 766
 767                     return false;
 768                 }).attr('title', SN.msg('showmore_tooltip'));
 769             }
 770         },
 771
 772         /**
 773          * Setup function -- DOES NOT trigger actions immediately.
 774          *
 775          * Sets up event handlers for the file-attachment widget in the
 776          * new notice form. When a file is selected, a box will be added
 777          * below the text input showing the filename and, if supported
 778          * by the browser, a thumbnail preview.
 779          *
 780          * This preview box will also allow removing the attachment
 781          * prior to posting.
 782          *
 783          * @param {jQuery} form
 784          */
 785         NoticeDataAttach: function(form) {
 786             var NDA = form.find('input[type=file]');
 787             NDA.change(function(event) {
 788                 form.find('.attach-status').remove();
 789
 790                 var filename = $(this).val();
 791                 if (!filename) {
 792                     // No file -- we've been tricked!
 793                     return false;
 794                 }
 795
 796                 var attachStatus = $('<div class="attach-status '+SN.C.S.Success+'"><code></code> <button class="close">&#215;</button></div>');
 797                 attachStatus.find('code').text(filename);
 798                 attachStatus.find('button').click(function(){
 799                     attachStatus.remove();
 800                     NDA.val('');
 801
 802                     return false;
 803                 });
 804                 form.append(attachStatus);
 805
 806                 if (typeof this.files == "object") {
 807                     // Some newer browsers will let us fetch the files for preview.
 808                     for (var i = 0; i < this.files.length; i++) {
 809                         SN.U.PreviewAttach(form, this.files[i]);
 810                     }
 811                 }
 812             });
 813         },
 814
 815         /**
 816          * Get PHP's MAX_FILE_SIZE setting for this form;
 817          * used to apply client-side file size limit checks.
 818          *
 819          * @param {jQuery} form
 820          * @return int max size in bytes; 0 or negative means no limit
 821          */
 822         maxFileSize: function(form) {
 823             var max = $(form).find('input[name=MAX_FILE_SIZE]').attr('value');
 824             if (max) {
 825                 return parseInt(max);
 826             } else {
 827                 return 0;
 828             }
 829         },
 830
 831         /**
 832          * For browsers with FileAPI support: make a thumbnail if possible,
 833          * and append it into the attachment display widget.
 834          *
 835          * Known good:
 836          * - Firefox 3.6.6, 4.0b7
 837          * - Chrome 8.0.552.210
 838          *
 839          * Known ok metadata, can't get contents:
 840          * - Safari 5.0.2
 841          *
 842          * Known fail:
 843          * - Opera 10.63, 11 beta (no input.files interface)
 844          *
 845          * @param {jQuery} form
 846          * @param {File} file
 847          *
 848          * @todo use configured thumbnail size
 849          * @todo detect pixel size?
 850          * @todo should we render a thumbnail to a canvas and then use the smaller image?
 851          */
 852         PreviewAttach: function(form, file) {
 853             var tooltip = file.type + ' ' + Math.round(file.size / 1024) + 'KB';
 854             var preview = true;
 855
 856             var blobAsDataURL;
 857             if (typeof window.createObjectURL != "undefined") {
 858                 /**
 859                  * createObjectURL lets us reference the file directly from an <img>
 860                  * This produces a compact URL with an opaque reference to the file,
 861                  * which we can reference immediately.
 862                  *
 863                  * - Firefox 3.6.6: no
 864                  * - Firefox 4.0b7: no
 865                  * - Safari 5.0.2: no
 866                  * - Chrome 8.0.552.210: works!
 867                  */
 868                 blobAsDataURL = function(blob, callback) {
 869                     callback(window.createObjectURL(blob));
 870                 }
 871             } else if (typeof window.FileReader != "undefined") {
 872                 /**
 873                  * FileAPI's FileReader can build a data URL from a blob's contents,
 874                  * but it must read the file and build it asynchronously. This means
 875                  * we'll be passing a giant data URL around, which may be inefficient.
 876                  *
 877                  * - Firefox 3.6.6: works!
 878                  * - Firefox 4.0b7: works!
 879                  * - Safari 5.0.2: no
 880                  * - Chrome 8.0.552.210: works!
 881                  */
 882                 blobAsDataURL = function(blob, callback) {
 883                     var reader = new FileReader();
 884                     reader.onload = function(event) {
 885                         callback(reader.result);
 886                     }
 887                     reader.readAsDataURL(blob);
 888                 }
 889             } else {
 890                 preview = false;
 891             }
 892
 893             var imageTypes = ['image/png', 'image/jpeg', 'image/gif', 'image/svg+xml'];
 894             if ($.inArray(file.type, imageTypes) == -1) {
 895                 // We probably don't know how to show the file.
 896                 preview = false;
 897             }
 898
 899             var maxSize = 8 * 1024 * 1024;
 900             if (file.size > maxSize) {
 901                 // Don't kill the browser trying to load some giant image.
 902                 preview = false;
 903             }
 904
 905             if (preview) {
 906                 blobAsDataURL(file, function(url) {
 907                     var img = $('<img>')
 908                         .attr('title', tooltip)
 909                         .attr('alt', tooltip)
 910                         .attr('src', url)
 911                         .attr('style', 'height: 120px');
 912                     form.find('.attach-status').append(img);
 913                 });
 914             } else {
 915                 var img = $('<div></div>').text(tooltip);
 916                 form.find('.attach-status').append(img);
 917             }
 918         },
 919
 920         /**
 921          * Setup function -- DOES NOT trigger actions immediately.
 922          *
 923          * Initializes state for the location-lookup features in the
 924          * new-notice form. Seems to set up some event handlers for
 925          * triggering lookups and using the new values.
 926          *
 927          * @param {jQuery} form
 928          *
 929          * @fixme tl;dr
 930          * @fixme there's not good visual state update here, so users have a
 931          *        hard time figuring out if it's working or fixing if it's wrong.
 932          *
 933          */
 934         NoticeLocationAttach: function(form) {
 935             // @fixme this should not be tied to the main notice form, as there may be multiple notice forms...
 936             var NLat = form.find('[name=lat]')
 937             var NLon = form.find('[name=lon]')
 938             var NLNS = form.find('[name=location_ns]').val();
 939             var NLID = form.find('[name=location_id]').val();
 940             var NLN = ''; // @fixme
 941             var NDGe = form.find('[name=notice_data-geo]');
 942             var check = form.find('[name=notice_data-geo]');
 943             var label = form.find('label.notice_data-geo');
 944
 945             function removeNoticeDataGeo(error) {
 946                 label
 947                     .attr('title', jQuery.trim(label.text()))
 948                     .removeClass('checked');
 949
 950                 form.find('[name=lat]').val('');
 951                 form.find('[name=lon]').val('');
 952                 form.find('[name=location_ns]').val('');
 953                 form.find('[name=location_id]').val('');
 954                 form.find('[name=notice_data-geo]').attr('checked', false);
 955
 956                 $.cookie(SN.C.S.NoticeDataGeoCookie, 'disabled', { path: '/' });
 957
 958                 if (error) {
 959                     form.find('.geo_status_wrapper').removeClass('success').addClass('error');
 960                     form.find('.geo_status_wrapper .geo_status').text(error);
 961                 } else {
 962                     form.find('.geo_status_wrapper').remove();
 963                 }
 964             }
 965
 966             function getJSONgeocodeURL(geocodeURL, data) {
 967                 SN.U.NoticeGeoStatus(form, 'Looking up place name...');
 968                 $.getJSON(geocodeURL, data, function(location) {
 969                     var lns, lid;
 970
 971                     if (typeof(location.location_ns) != 'undefined') {
 972                         form.find('[name=location_ns]').val(location.location_ns);
 973                         lns = location.location_ns;
 974                     }
 975
 976                     if (typeof(location.location_id) != 'undefined') {
 977                         form.find('[name=location_id]').val(location.location_id);
 978                         lid = location.location_id;
 979                     }
 980
 981                     if (typeof(location.name) == 'undefined') {
 982                         NLN_text = data.lat + ';' + data.lon;
 983                     }
 984                     else {
 985                         NLN_text = location.name;
 986                     }
 987
 988                     SN.U.NoticeGeoStatus(form, NLN_text, data.lat, data.lon, location.url);
 989                     label
 990                         .attr('title', NoticeDataGeo_text.ShareDisable + ' (' + NLN_text + ')');
 991
 992                     form.find('[name=lat]').val(data.lat);
 993                     form.find('[name=lon]').val(data.lon);
 994                     form.find('[name=location_ns]').val(lns);
 995                     form.find('[name=location_id]').val(lid);
 996                     form.find('[name=notice_data-geo]').attr('checked', true);
 997
 998                     var cookieValue = {
 999                         NLat: data.lat,
1000                         NLon: data.lon,
1001                         NLNS: lns,
1002                         NLID: lid,
1003                         NLN: NLN_text,
1004                         NLNU: location.url,
1005                         NDG: true
1006                     };
1007
1008                     $.cookie(SN.C.S.NoticeDataGeoCookie, JSON.stringify(cookieValue), { path: '/' });
1009                 });
1010             }
1011
1012             if (check.length > 0) {
1013                 if ($.cookie(SN.C.S.NoticeDataGeoCookie) == 'disabled') {
1014                     check.attr('checked', false);
1015                 }
1016                 else {
1017                     check.attr('checked', true);
1018                 }
1019
1020                 var NGW = form.find('.notice_data-geo_wrap');
1021                 var geocodeURL = NGW.attr('data-api');
1022
1023                 label
1024                     .attr('title', label.text());
1025
1026                 check.change(function() {
1027                     if (check.attr('checked') === true || $.cookie(SN.C.S.NoticeDataGeoCookie) === null) {
1028                         label
1029                             .attr('title', NoticeDataGeo_text.ShareDisable)
1030                             .addClass('checked');
1031
1032                         if ($.cookie(SN.C.S.NoticeDataGeoCookie) === null || $.cookie(SN.C.S.NoticeDataGeoCookie) == 'disabled') {
1033                             if (navigator.geolocation) {
1034                                 SN.U.NoticeGeoStatus(form, 'Requesting location from browser...');
1035                                 navigator.geolocation.getCurrentPosition(
1036                                     function(position) {
1037                                         form.find('[name=lat]').val(position.coords.latitude);
1038                                         form.find('[name=lon]').val(position.coords.longitude);
1039
1040                                         var data = {
1041                                             lat: position.coords.latitude,
1042                                             lon: position.coords.longitude,
1043                                             token: $('#token').val()
1044                                         };
1045
1046                                         getJSONgeocodeURL(geocodeURL, data);
1047                                     },
1048
1049                                     function(error) {
1050                                         switch(error.code) {
1051                                             case error.PERMISSION_DENIED:
1052                                                 removeNoticeDataGeo('Location permission denied.');
1053                                                 break;
1054                                             case error.TIMEOUT:
1055                                                 //$('#'+SN.C.S.NoticeDataGeo).attr('checked', false);
1056                                                 removeNoticeDataGeo('Location lookup timeout.');
1057                                                 break;
1058                                         }
1059                                     },
1060
1061                                     {
1062                                         timeout: 10000
1063                                     }
1064                                 );
1065                             }
1066                             else {
1067                                 if (NLat.length > 0 && NLon.length > 0) {
1068                                     var data = {
1069                                         lat: NLat,
1070                                         lon: NLon,
1071                                         token: $('#token').val()
1072                                     };
1073
1074                                     getJSONgeocodeURL(geocodeURL, data);
1075                                 }
1076                                 else {
1077                                     removeNoticeDataGeo();
1078                                     check.remove();
1079                                     label.remove();
1080                                 }
1081                             }
1082                         }
1083                         else {
1084                             var cookieValue = JSON.parse($.cookie(SN.C.S.NoticeDataGeoCookie));
1085
1086                             form.find('[name=lat]').val(cookieValue.NLat);
1087                             form.find('[name=lon]').val(cookieValue.NLon);
1088                             form.find('[name=location_ns]').val(cookieValue.NLNS);
1089                             form.find('[name=location_id]').val(cookieValue.NLID);
1090                             form.find('[name=notice_data-geo]').attr('checked', cookieValue.NDG);
1091
1092                             SN.U.NoticeGeoStatus(form, cookieValue.NLN, cookieValue.NLat, cookieValue.NLon, cookieValue.NLNU);
1093                             label
1094                                 .attr('title', NoticeDataGeo_text.ShareDisable + ' (' + cookieValue.NLN + ')')
1095                                 .addClass('checked');
1096                         }
1097                     }
1098                     else {
1099                         removeNoticeDataGeo();
1100                     }
1101                 }).change();
1102             }
1103         },
1104
1105         /**
1106          * Create or update a geolocation status widget in this notice posting form.
1107          *
1108          * @param {jQuery} form
1109          * @param {String} status
1110          * @param {String} lat (optional)
1111          * @param {String} lon (optional)
1112          * @param {String} url (optional)
1113          */
1114         NoticeGeoStatus: function(form, status, lat, lon, url)
1115         {
1116             var wrapper = form.find('.geo_status_wrapper');
1117             if (wrapper.length == 0) {
1118                 wrapper = $('<div class="'+SN.C.S.Success+' geo_status_wrapper"><button class="close" style="float:right">&#215;</button><div class="geo_status"></div></div>');
1119                 wrapper.find('button.close').click(function() {
1120                     form.find('[name=notice_data-geo]').removeAttr('checked').change();
1121                     return false;
1122                 });
1123                 form.append(wrapper);
1124             }
1125             var label;
1126             if (url) {
1127                 label = $('<a></a>').attr('href', url);
1128             } else {
1129                 label = $('<span></span>');
1130             }
1131             label.text(status);
1132             if (lat || lon) {
1133                 var latlon = lat + ';' + lon;
1134                 label.attr('title', latlon);
1135                 if (!status) {
1136                     label.text(latlon)
1137                 }
1138             }
1139             wrapper.find('.geo_status').empty().append(label);
1140         },
1141
1142         /**
1143          * Setup function -- DOES NOT trigger actions immediately.
1144          *
1145          * Initializes event handlers for the "Send direct message" link on
1146          * profile pages, setting it up to display a dialog box when clicked.
1147          *
1148          * Unlike the repeat confirmation form, this appears to fetch
1149          * the form _from the original link target_, so the form itself
1150          * doesn't need to be in the current document.
1151          *
1152          * @fixme breaks ability to open link in new window?
1153          */
1154         NewDirectMessage: function() {
1155             NDM = $('.entity_send-a-message a');
1156             NDM.attr({'href':NDM.attr('href')+'&ajax=1'});
1157             NDM.bind('click', function() {
1158                 var NDMF = $('.entity_send-a-message form');
1159                 if (NDMF.length === 0) {
1160                     $(this).addClass(SN.C.S.Processing);
1161                     $.get(NDM.attr('href'), null, function(data) {
1162                         $('.entity_send-a-message').append(document._importNode($('form', data)[0], true));
1163                         NDMF = $('.entity_send-a-message .form_notice');
1164                         SN.U.FormNoticeXHR(NDMF);
1165                         SN.U.FormNoticeEnhancements(NDMF);
1166                         NDMF.append('<button class="close">&#215;</button>');
1167                         $('.entity_send-a-message button').click(function(){
1168                             NDMF.hide();
1169                             return false;
1170                         });
1171                         NDM.removeClass(SN.C.S.Processing);
1172                     });
1173                 }
1174                 else {
1175                     NDMF.show();
1176                     $('.entity_send-a-message textarea').focus();
1177                 }
1178                 return false;
1179             });
1180         },
1181
1182         /**
1183          * Return a date object with the current local time on the
1184          * given year, month, and day.
1185          *
1186          * @param {number} year: 4-digit year
1187          * @param {number} month: 0 == January
1188          * @param {number} day: 1 == 1
1189          * @return {Date}
1190          */
1191         GetFullYear: function(year, month, day) {
1192             var date = new Date();
1193             date.setFullYear(year, month, day);
1194
1195             return date;
1196         },
1197
1198         /**
1199          * Some sort of object interface for storing some structured
1200          * information in a cookie.
1201          *
1202          * Appears to be used to save the last-used login nickname?
1203          * That's something that browsers usually take care of for us
1204          * these days, do we really need to do it? Does anything else
1205          * use this interface?
1206          *
1207          * @fixme what is this?
1208          * @fixme should this use non-cookie local storage when available?
1209          */
1210         StatusNetInstance: {
1211             /**
1212              * @fixme what is this?
1213              */
1214             Set: function(value) {
1215                 var SNI = SN.U.StatusNetInstance.Get();
1216                 if (SNI !== null) {
1217                     value = $.extend(SNI, value);
1218                 }
1219
1220                 $.cookie(
1221                     SN.C.S.StatusNetInstance,
1222                     JSON.stringify(value),
1223                     {
1224                         path: '/',
1225                         expires: SN.U.GetFullYear(2029, 0, 1)
1226                     });
1227             },
1228
1229             /**
1230              * @fixme what is this?
1231              */
1232             Get: function() {
1233                 var cookieValue = $.cookie(SN.C.S.StatusNetInstance);
1234                 if (cookieValue !== null) {
1235                     return JSON.parse(cookieValue);
1236                 }
1237                 return null;
1238             },
1239
1240             /**
1241              * @fixme what is this?
1242              */
1243             Delete: function() {
1244                 $.cookie(SN.C.S.StatusNetInstance, null);
1245             }
1246         },
1247
1248         /**
1249          * Check if the current page is a timeline where the current user's
1250          * posts should be displayed immediately on success.
1251          *
1252          * @fixme this should be done in a saner way, with machine-readable
1253          * info about what page we're looking at.
1254          *
1255          * @param {DOMElement} notice: HTML chunk with formatted notice
1256          * @return boolean
1257          */
1258         belongsOnTimeline: function(notice) {
1259             var action = $("body").attr('id');
1260             if (action == 'public') {
1261                 return true;
1262             }
1263
1264             var profileLink = $('#nav_profile a').attr('href');
1265             if (profileLink) {
1266                 var authorUrl = $(notice).find('.vcard.author a.url').attr('href');
1267                 if (authorUrl == profileLink) {
1268                     if (action == 'all' || action == 'showstream') {
1269                         // Posts always show on your own friends and profile streams.
1270                         return true;
1271                     }
1272                 }
1273             }
1274
1275             // @fixme tag, group, reply timelines should be feasible as well.
1276             // Mismatch between id-based and name-based user/group links currently complicates
1277             // the lookup, since all our inline mentions contain the absolute links but the
1278             // UI links currently on the page use malleable names.
1279
1280             return false;
1281         },
1282
1283         /**
1284          * Switch to another active input sub-form.
1285          * This will hide the current form (if any), show the new one, and
1286          * update the input type tab selection state.
1287          *
1288          * @param {String} tag
1289          */
1290         switchInputFormTab: function(tag) {
1291             // The one that's current isn't current anymore
1292             $('.input_form_nav_tab.current').removeClass('current');
1293             $('#input_form_nav_'+tag).addClass('current');
1294
1295             $('.input_form.current').removeClass('current');
1296             $('#input_form_'+tag)
1297                 .addClass('current')
1298                 .find('.ajax-notice').each(function() {
1299                     var form = $(this);
1300                     SN.Init.NoticeFormSetup(form);
1301                 })
1302                 .find('textarea:first').focus();
1303         }
1304     },
1305
1306     Init: {
1307         /**
1308          * If user is logged in, run setup code for the new notice form:
1309          *
1310          *  - char counter
1311          *  - AJAX submission
1312          *  - location events
1313          *  - file upload events
1314          */
1315         NoticeForm: function() {
1316             if ($('body.user_in').length > 0) {
1317                 // SN.Init.NoticeFormSetup() will get run
1318                 // when forms get displayed for the first time...
1319
1320                 // Hack to initialize the placeholder at top
1321                 $('#input_form_placeholder input.placeholder').focus(function() {
1322                     SN.U.switchInputFormTab("status");
1323                 });
1324
1325                 // Make inline reply forms self-close when clicking out.
1326                 $('body').bind('click', function(e) {
1327                     var currentForm = $('#content .input_forms div.current');
1328                     if (currentForm.length > 0) {
1329                         if ($('#content .input_forms').has(e.target).length == 0) {
1330                             // If all fields are empty, switch back to the placeholder.
1331                             var fields = currentForm.find('textarea, input[type=text], input[type=""]');
1332                             var anything = false;
1333                             fields.each(function() {
1334                                 anything = anything || $(this).val();
1335                             });
1336                             if (!anything) {
1337                                 SN.U.switchInputFormTab("placeholder");
1338                             }
1339                         }
1340                     }
1341
1342                     var openReplies = $('li.notice-reply');
1343                     if (openReplies.length > 0) {
1344                         var target = $(e.target);
1345                         openReplies.each(function() {
1346                             // Did we click outside this one?
1347                             var replyItem = $(this);
1348                             if (replyItem.has(e.target).length == 0) {
1349                                 var textarea = replyItem.find('.notice_data-text:first');
1350                                 var cur = $.trim(textarea.val());
1351                                 // Only close if there's been no edit.
1352                                 if (cur == '' || cur == textarea.data('initialText')) {
1353                                     var parentNotice = replyItem.closest('li.notice');
1354                                     replyItem.remove();
1355                                     SN.U.NoticeInlineReplyPlaceholder(parentNotice);
1356                                 }
1357                             }
1358                         });
1359                     }
1360                 });
1361             }
1362         },
1363
1364         /**
1365          * Encapsulate notice form setup for a single form.
1366          * Plugins can add extra setup by monkeypatching this
1367          * function.
1368          *
1369          * @param {jQuery} form
1370          */
1371         NoticeFormSetup: function(form) {
1372             if (!form.data('NoticeFormSetup')) {
1373                 SN.U.NoticeLocationAttach(form);
1374                 SN.U.FormNoticeXHR(form);
1375                 SN.U.FormNoticeEnhancements(form);
1376                 SN.U.NoticeDataAttach(form);
1377                 form.data('NoticeFormSetup', true);
1378             }
1379         },
1380
1381         /**
1382          * Run setup code for notice timeline views items:
1383          *
1384          * - AJAX submission for fave/repeat/reply (if logged in)
1385          * - Attachment link extras ('more' links)
1386          */
1387         Notices: function() {
1388             if ($('body.user_in').length > 0) {
1389                 var masterForm = $('.form_notice:first');
1390                 if (masterForm.length > 0) {
1391                     SN.C.I.NoticeFormMaster = document._importNode(masterForm[0], true);
1392                 }
1393                 SN.U.NoticeRepeat();
1394                 SN.U.NoticeReply();
1395                 SN.U.NoticeInlineReplySetup();
1396             }
1397
1398             SN.U.NoticeAttachments();
1399         },
1400
1401         /**
1402          * Run setup code for user & group profile page header area if logged in:
1403          *
1404          * - AJAX submission for sub/unsub/join/leave/nudge
1405          * - AJAX form popup for direct-message
1406          */
1407         EntityActions: function() {
1408             if ($('body.user_in').length > 0) {
1409                 SN.U.NewDirectMessage();
1410             }
1411         },
1412
1413         /**
1414          * Run setup code for login form:
1415          *
1416          * - loads saved last-used-nickname from cookie
1417          * - sets event handler to save nickname to cookie on submit
1418          *
1419          * @fixme is this necessary? Browsers do their own form saving these days.
1420          */
1421         Login: function() {
1422             if (SN.U.StatusNetInstance.Get() !== null) {
1423                 var nickname = SN.U.StatusNetInstance.Get().Nickname;
1424                 if (nickname !== null) {
1425                     $('#form_login #nickname').val(nickname);
1426                 }
1427             }
1428
1429             $('#form_login').bind('submit', function() {
1430                 SN.U.StatusNetInstance.Set({Nickname: $('#form_login #nickname').val()});
1431                 return true;
1432             });
1433         },
1434
1435         /**
1436          * Set up any generic 'ajax' form so it submits via AJAX with auto-replacement.
1437          */
1438         AjaxForms: function() {
1439             $('form.ajax').live('submit', function() {
1440                 SN.U.FormXHR($(this));
1441                 return false;
1442             });
1443         },
1444
1445         /**
1446          * Add logic to any file upload forms to handle file size limits,
1447          * on browsers that support basic FileAPI.
1448          */
1449         UploadForms: function () {
1450             $('input[type=file]').change(function(event) {
1451                 if (typeof this.files == "object" && this.files.length > 0) {
1452                     var size = 0;
1453                     for (var i = 0; i < this.files.length; i++) {
1454                         size += this.files[i].size;
1455                     }
1456
1457                     var max = SN.U.maxFileSize($(this.form));
1458                     if (max > 0 && size > max) {
1459                         var msg = 'File too large: maximum upload size is %d bytes.';
1460                         alert(msg.replace('%d', max));
1461
1462                         // Clear the files.
1463                         $(this).val('');
1464                         event.preventDefault();
1465                         return false;
1466                     }
1467                 }
1468             });
1469         }
1470     }
1471 };
1472
1473 /**
1474  * Run initialization functions on DOM-ready.
1475  *
1476  * Note that if we're waiting on other scripts to load, this won't happen
1477  * until that's done. To load scripts asynchronously without delaying setup,
1478  * don't start them loading until after DOM-ready time!
1479  */
1480 $(document).ready(function(){
1481     SN.Init.AjaxForms();
1482     SN.Init.UploadForms();
1483     if ($('.'+SN.C.S.FormNotice).length > 0) {
1484         SN.Init.NoticeForm();
1485     }
1486     if ($('#content .notices').length > 0) {
1487         SN.Init.Notices();
1488     }
1489     if ($('#content .entity_actions').length > 0) {
1490         SN.Init.EntityActions();
1491     }
1492     if ($('#form_login').length > 0) {
1493         SN.Init.Login();
1494     }
1495 });