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                                 }
 428                             } else {
 429                                 // Not on a timeline that this belongs on?
 430                                 // Just show a success message.
 431                                 // @fixme inline
 432                                 showFeedback('success', $('title', data).text());
 433                             }
 434                         }
 435                         form.resetForm();
 436                         form.find('[name=inreplyto]').val('');
 437                         form.find('.attach-status').remove();
 438                         SN.U.FormNoticeEnhancements(form);
 439                     }
 440                 },
 441                 complete: function(xhr, textStatus) {
 442                     form
 443                         .removeClass(SN.C.S.Processing)
 444                         .find('.submit')
 445                             .removeAttr(SN.C.S.Disabled)
 446                             .removeClass(SN.C.S.Disabled);
 447
 448                     form.find('[name=lat]').val(SN.C.I.NoticeDataGeo.NLat);
 449                     form.find('[name=lon]').val(SN.C.I.NoticeDataGeo.NLon);
 450                     form.find('[name=location_ns]').val(SN.C.I.NoticeDataGeo.NLNS);
 451                     form.find('[name=location_id]').val(SN.C.I.NoticeDataGeo.NLID);
 452                     form.find('[name=notice_data-geo]').attr('checked', SN.C.I.NoticeDataGeo.NDG);
 453                 }
 454             });
 455         },
 456
 457         normalizeGeoData: function(form) {
 458             SN.C.I.NoticeDataGeo.NLat = form.find('[name=lat]').val();
 459             SN.C.I.NoticeDataGeo.NLon = form.find('[name=lon]').val();
 460             SN.C.I.NoticeDataGeo.NLNS = form.find('[name=location_ns]').val();
 461             SN.C.I.NoticeDataGeo.NLID = form.find('[name=location_id]').val();
 462             SN.C.I.NoticeDataGeo.NDG = form.find('[name=notice_data-geo]').attr('checked'); // @fixme
 463
 464             var cookieValue = $.cookie(SN.C.S.NoticeDataGeoCookie);
 465
 466             if (cookieValue !== null && cookieValue != 'disabled') {
 467                 cookieValue = JSON.parse(cookieValue);
 468                 SN.C.I.NoticeDataGeo.NLat = form.find('[name=lat]').val(cookieValue.NLat).val();
 469                 SN.C.I.NoticeDataGeo.NLon = form.find('[name=lon]').val(cookieValue.NLon).val();
 470                 if (cookieValue.NLNS) {
 471                     SN.C.I.NoticeDataGeo.NLNS = form.find('[name=location_ns]').val(cookieValue.NLNS).val();
 472                     SN.C.I.NoticeDataGeo.NLID = form.find('[name=location_id]').val(cookieValue.NLID).val();
 473                 } else {
 474                     form.find('[name=location_ns]').val('');
 475                     form.find('[name=location_id]').val('');
 476                 }
 477             }
 478             if (cookieValue == 'disabled') {
 479                 SN.C.I.NoticeDataGeo.NDG = form.find('[name=notice_data-geo]').attr('checked', false).attr('checked');
 480             }
 481             else {
 482                 SN.C.I.NoticeDataGeo.NDG = form.find('[name=notice_data-geo]').attr('checked', true).attr('checked');
 483             }
 484
 485         },
 486         /**
 487          * Fetch an XML DOM from an XHR's response data.
 488          *
 489          * Works around unavailable responseXML when document.domain
 490          * has been modified by Meteor or other tools, in some but not
 491          * all browsers.
 492          *
 493          * @param {XMLHTTPRequest} xhr
 494          * @return DOMDocument
 495          */
 496         GetResponseXML: function(xhr) {
 497             try {
 498                 return xhr.responseXML;
 499             } catch (e) {
 500                 return (new DOMParser()).parseFromString(xhr.responseText, "text/xml");
 501             }
 502         },
 503
 504         /**
 505          * Setup function -- DOES NOT trigger actions immediately.
 506          *
 507          * Sets up event handlers on all visible notice's reply buttons to
 508          * tweak the new-notice form with needed variables and focus it
 509          * when pushed.
 510          *
 511          * (This replaces the default reply button behavior to submit
 512          * directly to a form which comes back with a specialized page
 513          * with the form data prefilled.)
 514          *
 515          * @access private
 516          */
 517         NoticeReply: function() {
 518             if ($('#content .notice_reply').length > 0) {
 519                 $('#content .notice').each(function() { SN.U.NoticeReplyTo($(this)); });
 520             }
 521         },
 522
 523         /**
 524          * Setup function -- DOES NOT trigger actions immediately.
 525          *
 526          * Sets up event handlers on the given notice's reply button to
 527          * tweak the new-notice form with needed variables and focus it
 528          * when pushed.
 529          *
 530          * (This replaces the default reply button behavior to submit
 531          * directly to a form which comes back with a specialized page
 532          * with the form data prefilled.)
 533          *
 534          * @param {jQuery} notice: jQuery object containing one or more notices
 535          * @access private
 536          */
 537         NoticeReplyTo: function(notice) {
 538             notice.find('.notice_reply').live('click', function(e) {
 539                 e.preventDefault();
 540                 var nickname = ($('.author .nickname', notice).length > 0) ? $($('.author .nickname', notice)[0]) : $('.author .nickname.uid');
 541                 SN.U.NoticeInlineReplyTrigger(notice, '@' + nickname.text());
 542                 return false;
 543             });
 544         },
 545
 546         /**
 547          * Open up a notice's inline reply box.
 548          *
 549          * @param {jQuery} notice: jQuery object containing one notice
 550          * @param {String} initialText
 551          */
 552         NoticeInlineReplyTrigger: function(notice, initialText) {
 553             // Find the notice we're replying to...
 554             var id = $($('.notice_id', notice)[0]).text();
 555             var parentNotice = notice;
 556
 557             // Find the threaded replies view we'll be adding to...
 558             var list = notice.closest('.notices');
 559             if (list.hasClass('threaded-replies')) {
 560                 // We're replying to a reply; use reply form on the end of this list.
 561                 // We'll add our form at the end of this; grab the root notice.
 562                 parentNotice = list.closest('.notice');
 563             } else {
 564                 // We're replying to a parent notice; pull its threaded list
 565                 // and we'll add on the end of it. Will add if needed.
 566                 list = $('ul.threaded-replies', notice);
 567                 if (list.length == 0) {
 568                     list = $('<ul class="notices threaded-replies xoxo"></ul>');
 569                     notice.append(list);
 570                 }
 571             }
 572
 573             // See if the form's already open...
 574             var replyForm = $('.notice-reply-form', list);
 575
 576             var nextStep = function() {
 577                 // Override...?
 578                 replyForm.find('input[name=inreplyto]').val(id);
 579
 580                 // Set focus...
 581                 var text = replyForm.find('textarea');
 582                 if (text.length == 0) {
 583                     throw "No textarea";
 584                 }
 585                 var replyto = '';
 586                 if (initialText) {
 587                     replyto = initialText + ' ';
 588                 }
 589                 text.val(replyto + text.val().replace(RegExp(replyto, 'i'), ''));
 590                 text.data('initialText', $.trim(initialText + ''));
 591                 text.focus();
 592                 if (text[0].setSelectionRange) {
 593                     var len = text.val().length;
 594                     text[0].setSelectionRange(len,len);
 595                 }
 596             };
 597             if (replyForm.length > 0) {
 598                 // Update the existing form...
 599                 nextStep();
 600             } else {
 601                 // Remove placeholder if any
 602                 list.find('li.notice-reply-placeholder').remove();
 603
 604                 // Create the reply form entry at the end
 605                 var replyItem = $('li.notice-reply', list);
 606                 if (replyItem.length == 0) {
 607                     replyItem = $('<li class="notice-reply"></li>');
 608
 609                     var intermediateStep = function(formMaster) {
 610                         var formEl = document._importNode(formMaster, true);
 611                         replyItem.append(formEl);
 612                         list.append(replyItem);
 613
 614                         var form = replyForm = $(formEl);
 615                         SN.Init.NoticeFormSetup(form);
 616
 617                         nextStep();
 618                     };
 619                     if (SN.C.I.NoticeFormMaster) {
 620                         // We've already saved a master copy of the form.
 621                         // Clone it in!
 622                         intermediateStep(SN.C.I.NoticeFormMaster);
 623                     } else {
 624                         // Fetch a fresh copy of the notice form over AJAX.
 625                         // Warning: this can have a delay, which looks bad.
 626                         // @fixme this fallback may or may not work
 627                         var url = $('#form_notice').attr('action');
 628                         $.get(url, {ajax: 1}, function(data, textStatus, xhr) {
 629                             intermediateStep($('form', data)[0]);
 630                         });
 631                     }
 632                 }
 633             }
 634         },
 635
 636         NoticeInlineReplyPlaceholder: function(notice) {
 637             var list = notice.find('ul.threaded-replies');
 638             var placeholder = $('<li class="notice-reply-placeholder">' +
 639                                     '<input class="placeholder">' +
 640                                 '</li>');
 641             placeholder.click(function() {
 642                 SN.U.NoticeInlineReplyTrigger(notice);
 643                 return false;
 644             });
 645             placeholder.find('input').val(SN.msg('reply_placeholder'));
 646             list.append(placeholder);
 647         },
 648
 649         /**
 650          * Setup function -- DOES NOT apply immediately.
 651          *
 652          * Sets up event handlers for favor/disfavor forms to submit via XHR.
 653          * Uses 'live' rather than 'bind', so applies to future as well as present items.
 654          */
 655         NoticeInlineReplySetup: function() {
 656             $('.threaded-replies').each(function() {
 657                 var list = $(this);
 658                 var notice = list.closest('.notice');
 659                 SN.U.NoticeInlineReplyPlaceholder(notice);
 660             });
 661         },
 662
 663         /**
 664          * Setup function -- DOES NOT trigger actions immediately.
 665          *
 666          * Sets up event handlers for repeat forms to toss up a confirmation
 667          * popout before submitting.
 668          *
 669          * Uses 'live' rather than 'bind', so applies to future as well as present items.
 670          */
 671         NoticeRepeat: function() {
 672             $('.form_repeat').live('click', function(e) {
 673                 e.preventDefault();
 674
 675                 SN.U.NoticeRepeatConfirmation($(this));
 676                 return false;
 677             });
 678         },
 679
 680         /**
 681          * Shows a confirmation dialog box variant of the repeat button form.
 682          * This seems to use a technique where the repeat form contains
 683          * _both_ a standalone button _and_ text and buttons for a dialog.
 684          * The dialog will close after its copy of the form is submitted,
 685          * or if you click its 'close' button.
 686          *
 687          * The dialog is created by duplicating the original form and changing
 688          * its style; while clever, this is hard to generalize and probably
 689          * duplicates a lot of unnecessary HTML output.
 690          *
 691          * @fixme create confirmation dialogs through a generalized interface
 692          * that can be reused instead of hardcoded text and styles.
 693          *
 694          * @param {jQuery} form
 695          */
 696         NoticeRepeatConfirmation: function(form) {
 697             var submit_i = form.find('.submit');
 698
 699             var submit = submit_i.clone();
 700             submit
 701                 .addClass('submit_dialogbox')
 702                 .removeClass('submit');
 703             form.append(submit);
 704             submit.bind('click', function() { SN.U.FormXHR(form); return false; });
 705
 706             submit_i.hide();
 707
 708             form
 709                 .addClass('dialogbox')
 710                 .append('<button class="close">&#215;</button>')
 711                 .closest('.notice-options')
 712                     .addClass('opaque');
 713
 714             form.find('button.close').click(function(){
 715                 $(this).remove();
 716
 717                 form
 718                     .removeClass('dialogbox')
 719                     .closest('.notice-options')
 720                         .removeClass('opaque');
 721
 722                 form.find('.submit_dialogbox').remove();
 723                 form.find('.submit').show();
 724
 725                 return false;
 726             });
 727         },
 728
 729         /**
 730          * Setup function -- DOES NOT trigger actions immediately.
 731          *
 732          * Goes through all notices currently displayed and sets up attachment
 733          * handling if needed.
 734          */
 735         NoticeAttachments: function() {
 736             $('.notice a.attachment').each(function() {
 737                 SN.U.NoticeWithAttachment($(this).closest('.notice'));
 738             });
 739         },
 740
 741         /**
 742          * Setup function -- DOES NOT trigger actions immediately.
 743          *
 744          * Sets up special attachment link handling if needed. Currently this
 745          * consists only of making the "more" button used for OStatus message
 746          * cropping turn into an auto-expansion button that loads the full
 747          * text from an attachment file.
 748          *
 749          * @param {jQuery} notice
 750          */
 751         NoticeWithAttachment: function(notice) {
 752             if (notice.find('.attachment').length === 0) {
 753                 return;
 754             }
 755
 756             var attachment_more = notice.find('.attachment.more');
 757             if (attachment_more.length > 0) {
 758                 $(attachment_more[0]).click(function() {
 759                     var m = $(this);
 760                     m.addClass(SN.C.S.Processing);
 761                     $.get(m.attr('href')+'/ajax', null, function(data) {
 762                         m.parent('.entry-content').html($(data).find('#attachment_view .entry-content').html());
 763                     });
 764
 765                     return false;
 766                 }).attr('title', SN.msg('showmore_tooltip'));
 767             }
 768         },
 769
 770         /**
 771          * Setup function -- DOES NOT trigger actions immediately.
 772          *
 773          * Sets up event handlers for the file-attachment widget in the
 774          * new notice form. When a file is selected, a box will be added
 775          * below the text input showing the filename and, if supported
 776          * by the browser, a thumbnail preview.
 777          *
 778          * This preview box will also allow removing the attachment
 779          * prior to posting.
 780          *
 781          * @param {jQuery} form
 782          */
 783         NoticeDataAttach: function(form) {
 784             var NDA = form.find('input[type=file]');
 785             NDA.change(function(event) {
 786                 form.find('.attach-status').remove();
 787
 788                 var filename = $(this).val();
 789                 if (!filename) {
 790                     // No file -- we've been tricked!
 791                     return false;
 792                 }
 793
 794                 var attachStatus = $('<div class="attach-status '+SN.C.S.Success+'"><code></code> <button class="close">&#215;</button></div>');
 795                 attachStatus.find('code').text(filename);
 796                 attachStatus.find('button').click(function(){
 797                     attachStatus.remove();
 798                     NDA.val('');
 799
 800                     return false;
 801                 });
 802                 form.append(attachStatus);
 803
 804                 if (typeof this.files == "object") {
 805                     // Some newer browsers will let us fetch the files for preview.
 806                     for (var i = 0; i < this.files.length; i++) {
 807                         SN.U.PreviewAttach(form, this.files[i]);
 808                     }
 809                 }
 810             });
 811         },
 812
 813         /**
 814          * Get PHP's MAX_FILE_SIZE setting for this form;
 815          * used to apply client-side file size limit checks.
 816          *
 817          * @param {jQuery} form
 818          * @return int max size in bytes; 0 or negative means no limit
 819          */
 820         maxFileSize: function(form) {
 821             var max = $(form).find('input[name=MAX_FILE_SIZE]').attr('value');
 822             if (max) {
 823                 return parseInt(max);
 824             } else {
 825                 return 0;
 826             }
 827         },
 828
 829         /**
 830          * For browsers with FileAPI support: make a thumbnail if possible,
 831          * and append it into the attachment display widget.
 832          *
 833          * Known good:
 834          * - Firefox 3.6.6, 4.0b7
 835          * - Chrome 8.0.552.210
 836          *
 837          * Known ok metadata, can't get contents:
 838          * - Safari 5.0.2
 839          *
 840          * Known fail:
 841          * - Opera 10.63, 11 beta (no input.files interface)
 842          *
 843          * @param {jQuery} form
 844          * @param {File} file
 845          *
 846          * @todo use configured thumbnail size
 847          * @todo detect pixel size?
 848          * @todo should we render a thumbnail to a canvas and then use the smaller image?
 849          */
 850         PreviewAttach: function(form, file) {
 851             var tooltip = file.type + ' ' + Math.round(file.size / 1024) + 'KB';
 852             var preview = true;
 853
 854             var blobAsDataURL;
 855             if (typeof window.createObjectURL != "undefined") {
 856                 /**
 857                  * createObjectURL lets us reference the file directly from an <img>
 858                  * This produces a compact URL with an opaque reference to the file,
 859                  * which we can reference immediately.
 860                  *
 861                  * - Firefox 3.6.6: no
 862                  * - Firefox 4.0b7: no
 863                  * - Safari 5.0.2: no
 864                  * - Chrome 8.0.552.210: works!
 865                  */
 866                 blobAsDataURL = function(blob, callback) {
 867                     callback(window.createObjectURL(blob));
 868                 }
 869             } else if (typeof window.FileReader != "undefined") {
 870                 /**
 871                  * FileAPI's FileReader can build a data URL from a blob's contents,
 872                  * but it must read the file and build it asynchronously. This means
 873                  * we'll be passing a giant data URL around, which may be inefficient.
 874                  *
 875                  * - Firefox 3.6.6: works!
 876                  * - Firefox 4.0b7: works!
 877                  * - Safari 5.0.2: no
 878                  * - Chrome 8.0.552.210: works!
 879                  */
 880                 blobAsDataURL = function(blob, callback) {
 881                     var reader = new FileReader();
 882                     reader.onload = function(event) {
 883                         callback(reader.result);
 884                     }
 885                     reader.readAsDataURL(blob);
 886                 }
 887             } else {
 888                 preview = false;
 889             }
 890
 891             var imageTypes = ['image/png', 'image/jpeg', 'image/gif', 'image/svg+xml'];
 892             if ($.inArray(file.type, imageTypes) == -1) {
 893                 // We probably don't know how to show the file.
 894                 preview = false;
 895             }
 896
 897             var maxSize = 8 * 1024 * 1024;
 898             if (file.size > maxSize) {
 899                 // Don't kill the browser trying to load some giant image.
 900                 preview = false;
 901             }
 902
 903             if (preview) {
 904                 blobAsDataURL(file, function(url) {
 905                     var img = $('<img>')
 906                         .attr('title', tooltip)
 907                         .attr('alt', tooltip)
 908                         .attr('src', url)
 909                         .attr('style', 'height: 120px');
 910                     form.find('.attach-status').append(img);
 911                 });
 912             } else {
 913                 var img = $('<div></div>').text(tooltip);
 914                 form.find('.attach-status').append(img);
 915             }
 916         },
 917
 918         /**
 919          * Setup function -- DOES NOT trigger actions immediately.
 920          *
 921          * Initializes state for the location-lookup features in the
 922          * new-notice form. Seems to set up some event handlers for
 923          * triggering lookups and using the new values.
 924          *
 925          * @param {jQuery} form
 926          *
 927          * @fixme tl;dr
 928          * @fixme there's not good visual state update here, so users have a
 929          *        hard time figuring out if it's working or fixing if it's wrong.
 930          *
 931          */
 932         NoticeLocationAttach: function(form) {
 933             // @fixme this should not be tied to the main notice form, as there may be multiple notice forms...
 934             var NLat = form.find('[name=lat]')
 935             var NLon = form.find('[name=lon]')
 936             var NLNS = form.find('[name=location_ns]').val();
 937             var NLID = form.find('[name=location_id]').val();
 938             var NLN = ''; // @fixme
 939             var NDGe = form.find('[name=notice_data-geo]');
 940             var check = form.find('[name=notice_data-geo]');
 941             var label = form.find('label.notice_data-geo');
 942
 943             function removeNoticeDataGeo(error) {
 944                 label
 945                     .attr('title', jQuery.trim(label.text()))
 946                     .removeClass('checked');
 947
 948                 form.find('[name=lat]').val('');
 949                 form.find('[name=lon]').val('');
 950                 form.find('[name=location_ns]').val('');
 951                 form.find('[name=location_id]').val('');
 952                 form.find('[name=notice_data-geo]').attr('checked', false);
 953
 954                 $.cookie(SN.C.S.NoticeDataGeoCookie, 'disabled', { path: '/' });
 955
 956                 if (error) {
 957                     form.find('.geo_status_wrapper').removeClass('success').addClass('error');
 958                     form.find('.geo_status_wrapper .geo_status').text(error);
 959                 } else {
 960                     form.find('.geo_status_wrapper').remove();
 961                 }
 962             }
 963
 964             function getJSONgeocodeURL(geocodeURL, data) {
 965                 SN.U.NoticeGeoStatus(form, 'Looking up place name...');
 966                 $.getJSON(geocodeURL, data, function(location) {
 967                     var lns, lid;
 968
 969                     if (typeof(location.location_ns) != 'undefined') {
 970                         form.find('[name=location_ns]').val(location.location_ns);
 971                         lns = location.location_ns;
 972                     }
 973
 974                     if (typeof(location.location_id) != 'undefined') {
 975                         form.find('[name=location_id]').val(location.location_id);
 976                         lid = location.location_id;
 977                     }
 978
 979                     if (typeof(location.name) == 'undefined') {
 980                         NLN_text = data.lat + ';' + data.lon;
 981                     }
 982                     else {
 983                         NLN_text = location.name;
 984                     }
 985
 986                     SN.U.NoticeGeoStatus(form, NLN_text, data.lat, data.lon, location.url);
 987                     label
 988                         .attr('title', NoticeDataGeo_text.ShareDisable + ' (' + NLN_text + ')');
 989
 990                     form.find('[name=lat]').val(data.lat);
 991                     form.find('[name=lon]').val(data.lon);
 992                     form.find('[name=location_ns]').val(lns);
 993                     form.find('[name=location_id]').val(lid);
 994                     form.find('[name=notice_data-geo]').attr('checked', true);
 995
 996                     var cookieValue = {
 997                         NLat: data.lat,
 998                         NLon: data.lon,
 999                         NLNS: lns,
1000                         NLID: lid,
1001                         NLN: NLN_text,
1002                         NLNU: location.url,
1003                         NDG: true
1004                     };
1005
1006                     $.cookie(SN.C.S.NoticeDataGeoCookie, JSON.stringify(cookieValue), { path: '/' });
1007                 });
1008             }
1009
1010             if (check.length > 0) {
1011                 if ($.cookie(SN.C.S.NoticeDataGeoCookie) == 'disabled') {
1012                     check.attr('checked', false);
1013                 }
1014                 else {
1015                     check.attr('checked', true);
1016                 }
1017
1018                 var NGW = form.find('.notice_data-geo_wrap');
1019                 var geocodeURL = NGW.attr('title');
1020                 NGW.removeAttr('title');
1021
1022                 label
1023                     .attr('title', label.text());
1024
1025                 check.change(function() {
1026                     if (check.attr('checked') === true || $.cookie(SN.C.S.NoticeDataGeoCookie) === null) {
1027                         label
1028                             .attr('title', NoticeDataGeo_text.ShareDisable)
1029                             .addClass('checked');
1030
1031                         if ($.cookie(SN.C.S.NoticeDataGeoCookie) === null || $.cookie(SN.C.S.NoticeDataGeoCookie) == 'disabled') {
1032                             if (navigator.geolocation) {
1033                                 SN.U.NoticeGeoStatus(form, 'Requesting location from browser...');
1034                                 navigator.geolocation.getCurrentPosition(
1035                                     function(position) {
1036                                         form.find('[name=lat]').val(position.coords.latitude);
1037                                         form.find('[name=lon]').val(position.coords.longitude);
1038
1039                                         var data = {
1040                                             lat: position.coords.latitude,
1041                                             lon: position.coords.longitude,
1042                                             token: $('#token').val()
1043                                         };
1044
1045                                         getJSONgeocodeURL(geocodeURL, data);
1046                                     },
1047
1048                                     function(error) {
1049                                         switch(error.code) {
1050                                             case error.PERMISSION_DENIED:
1051                                                 removeNoticeDataGeo('Location permission denied.');
1052                                                 break;
1053                                             case error.TIMEOUT:
1054                                                 //$('#'+SN.C.S.NoticeDataGeo).attr('checked', false);
1055                                                 removeNoticeDataGeo('Location lookup timeout.');
1056                                                 break;
1057                                         }
1058                                     },
1059
1060                                     {
1061                                         timeout: 10000
1062                                     }
1063                                 );
1064                             }
1065                             else {
1066                                 if (NLat.length > 0 && NLon.length > 0) {
1067                                     var data = {
1068                                         lat: NLat,
1069                                         lon: NLon,
1070                                         token: $('#token').val()
1071                                     };
1072
1073                                     getJSONgeocodeURL(geocodeURL, data);
1074                                 }
1075                                 else {
1076                                     removeNoticeDataGeo();
1077                                     check.remove();
1078                                     label.remove();
1079                                 }
1080                             }
1081                         }
1082                         else {
1083                             var cookieValue = JSON.parse($.cookie(SN.C.S.NoticeDataGeoCookie));
1084
1085                             form.find('[name=lat]').val(cookieValue.NLat);
1086                             form.find('[name=lon]').val(cookieValue.NLon);
1087                             form.find('[name=location_ns]').val(cookieValue.NLNS);
1088                             form.find('[name=location_id]').val(cookieValue.NLID);
1089                             form.find('[name=notice_data-geo]').attr('checked', cookieValue.NDG);
1090
1091                             SN.U.NoticeGeoStatus(form, cookieValue.NLN, cookieValue.NLat, cookieValue.NLon, cookieValue.NLNU);
1092                             label
1093                                 .attr('title', NoticeDataGeo_text.ShareDisable + ' (' + cookieValue.NLN + ')')
1094                                 .addClass('checked');
1095                         }
1096                     }
1097                     else {
1098                         removeNoticeDataGeo();
1099                     }
1100                 }).change();
1101             }
1102         },
1103
1104         /**
1105          * Create or update a geolocation status widget in this notice posting form.
1106          *
1107          * @param {jQuery} form
1108          * @param {String} status
1109          * @param {String} lat (optional)
1110          * @param {String} lon (optional)
1111          * @param {String} url (optional)
1112          */
1113         NoticeGeoStatus: function(form, status, lat, lon, url)
1114         {
1115             var wrapper = form.find('.geo_status_wrapper');
1116             if (wrapper.length == 0) {
1117                 wrapper = $('<div class="'+SN.C.S.Success+' geo_status_wrapper"><button class="close" style="float:right">&#215;</button><div class="geo_status"></div></div>');
1118                 wrapper.find('button.close').click(function() {
1119                     form.find('[name=notice_data-geo]').removeAttr('checked').change();
1120                 });
1121                 form.append(wrapper);
1122             }
1123             var label;
1124             if (url) {
1125                 label = $('<a></a>').attr('href', url);
1126             } else {
1127                 label = $('<span></span>');
1128             }
1129             label.text(status);
1130             if (lat || lon) {
1131                 var latlon = lat + ';' + lon;
1132                 label.attr('title', latlon);
1133                 if (!status) {
1134                     label.text(latlon)
1135                 }
1136             }
1137             wrapper.find('.geo_status').empty().append(label);
1138         },
1139
1140         /**
1141          * Setup function -- DOES NOT trigger actions immediately.
1142          *
1143          * Initializes event handlers for the "Send direct message" link on
1144          * profile pages, setting it up to display a dialog box when clicked.
1145          *
1146          * Unlike the repeat confirmation form, this appears to fetch
1147          * the form _from the original link target_, so the form itself
1148          * doesn't need to be in the current document.
1149          *
1150          * @fixme breaks ability to open link in new window?
1151          */
1152         NewDirectMessage: function() {
1153             NDM = $('.entity_send-a-message a');
1154             NDM.attr({'href':NDM.attr('href')+'&ajax=1'});
1155             NDM.bind('click', function() {
1156                 var NDMF = $('.entity_send-a-message form');
1157                 if (NDMF.length === 0) {
1158                     $(this).addClass(SN.C.S.Processing);
1159                     $.get(NDM.attr('href'), null, function(data) {
1160                         $('.entity_send-a-message').append(document._importNode($('form', data)[0], true));
1161                         NDMF = $('.entity_send-a-message .form_notice');
1162                         SN.U.FormNoticeXHR(NDMF);
1163                         SN.U.FormNoticeEnhancements(NDMF);
1164                         NDMF.append('<button class="close">&#215;</button>');
1165                         $('.entity_send-a-message button').click(function(){
1166                             NDMF.hide();
1167                             return false;
1168                         });
1169                         NDM.removeClass(SN.C.S.Processing);
1170                     });
1171                 }
1172                 else {
1173                     NDMF.show();
1174                     $('.entity_send-a-message textarea').focus();
1175                 }
1176                 return false;
1177             });
1178         },
1179
1180         /**
1181          * Return a date object with the current local time on the
1182          * given year, month, and day.
1183          *
1184          * @param {number} year: 4-digit year
1185          * @param {number} month: 0 == January
1186          * @param {number} day: 1 == 1
1187          * @return {Date}
1188          */
1189         GetFullYear: function(year, month, day) {
1190             var date = new Date();
1191             date.setFullYear(year, month, day);
1192
1193             return date;
1194         },
1195
1196         /**
1197          * Some sort of object interface for storing some structured
1198          * information in a cookie.
1199          *
1200          * Appears to be used to save the last-used login nickname?
1201          * That's something that browsers usually take care of for us
1202          * these days, do we really need to do it? Does anything else
1203          * use this interface?
1204          *
1205          * @fixme what is this?
1206          * @fixme should this use non-cookie local storage when available?
1207          */
1208         StatusNetInstance: {
1209             /**
1210              * @fixme what is this?
1211              */
1212             Set: function(value) {
1213                 var SNI = SN.U.StatusNetInstance.Get();
1214                 if (SNI !== null) {
1215                     value = $.extend(SNI, value);
1216                 }
1217
1218                 $.cookie(
1219                     SN.C.S.StatusNetInstance,
1220                     JSON.stringify(value),
1221                     {
1222                         path: '/',
1223                         expires: SN.U.GetFullYear(2029, 0, 1)
1224                     });
1225             },
1226
1227             /**
1228              * @fixme what is this?
1229              */
1230             Get: function() {
1231                 var cookieValue = $.cookie(SN.C.S.StatusNetInstance);
1232                 if (cookieValue !== null) {
1233                     return JSON.parse(cookieValue);
1234                 }
1235                 return null;
1236             },
1237
1238             /**
1239              * @fixme what is this?
1240              */
1241             Delete: function() {
1242                 $.cookie(SN.C.S.StatusNetInstance, null);
1243             }
1244         },
1245
1246         /**
1247          * Check if the current page is a timeline where the current user's
1248          * posts should be displayed immediately on success.
1249          *
1250          * @fixme this should be done in a saner way, with machine-readable
1251          * info about what page we're looking at.
1252          *
1253          * @param {DOMElement} notice: HTML chunk with formatted notice
1254          * @return boolean
1255          */
1256         belongsOnTimeline: function(notice) {
1257             var action = $("body").attr('id');
1258             if (action == 'public') {
1259                 return true;
1260             }
1261
1262             var profileLink = $('#nav_profile a').attr('href');
1263             if (profileLink) {
1264                 var authorUrl = $(notice).find('.vcard.author a.url').attr('href');
1265                 if (authorUrl == profileLink) {
1266                     if (action == 'all' || action == 'showstream') {
1267                         // Posts always show on your own friends and profile streams.
1268                         return true;
1269                     }
1270                 }
1271             }
1272
1273             // @fixme tag, group, reply timelines should be feasible as well.
1274             // Mismatch between id-based and name-based user/group links currently complicates
1275             // the lookup, since all our inline mentions contain the absolute links but the
1276             // UI links currently on the page use malleable names.
1277
1278             return false;
1279         },
1280
1281         /**
1282          * Switch to another active input sub-form.
1283          * This will hide the current form (if any), show the new one, and
1284          * update the input type tab selection state.
1285          *
1286          * @param {String} tag
1287          */
1288         switchInputFormTab: function(tag) {
1289             // The one that's current isn't current anymore
1290             $('.input_form_nav_tab.current').removeClass('current');
1291             $('#input_form_nav_'+tag).addClass('current');
1292
1293             $('.input_form.current').removeClass('current');
1294             $('#input_form_'+tag).addClass('current');
1295         }
1296     },
1297
1298     Init: {
1299         /**
1300          * If user is logged in, run setup code for the new notice form:
1301          *
1302          *  - char counter
1303          *  - AJAX submission
1304          *  - location events
1305          *  - file upload events
1306          */
1307         NoticeForm: function() {
1308             if ($('body.user_in').length > 0) {
1309                 $('.ajax-notice').each(function() {
1310                     var form = $(this);
1311                     SN.Init.NoticeFormSetup(form);
1312                 });
1313
1314                 // Make inline reply forms self-close when clicking out.
1315                 $('body').bind('click', function(e) {
1316                     var openReplies = $('li.notice-reply');
1317                     if (openReplies.length > 0) {
1318                         var target = $(e.target).closest('li.notice-reply');
1319                         if (target.length == 0) {
1320                             // There are inline replies open, and we
1321                             // clicked outside of one...
1322                             openReplies.each(function() {
1323                                 var replyItem = $(this);
1324                                 // Only close if there's been no edit.
1325                                 if (replyItem.find('.notice_data-text:first').val() == '') {
1326                                     var parentNotice = replyItem.closest('li.notice');
1327                                     replyItem.remove();
1328                                     SN.U.NoticeInlineReplyPlaceholder(parentNotice);
1329                                 }
1330                             });
1331                         }
1332                     }
1333                 });
1334             }
1335         },
1336
1337         /**
1338          * Encapsulate notice form setup for a single form.
1339          * Plugins can add extra setup by monkeypatching this
1340          * function.
1341          *
1342          * @param {jQuery} form
1343          */
1344         NoticeFormSetup: function(form) {
1345             SN.U.NoticeLocationAttach(form);
1346             SN.U.FormNoticeXHR(form);
1347             SN.U.FormNoticeEnhancements(form);
1348             SN.U.NoticeDataAttach(form);
1349         },
1350
1351         /**
1352          * Run setup code for notice timeline views items:
1353          *
1354          * - AJAX submission for fave/repeat/reply (if logged in)
1355          * - Attachment link extras ('more' links)
1356          */
1357         Notices: function() {
1358             if ($('body.user_in').length > 0) {
1359                 var masterForm = $('.form_notice:first');
1360                 if (masterForm.length > 0) {
1361                     SN.C.I.NoticeFormMaster = document._importNode(masterForm[0], true);
1362                 }
1363                 SN.U.NoticeRepeat();
1364                 SN.U.NoticeReply();
1365                 SN.U.NoticeInlineReplySetup();
1366             }
1367
1368             SN.U.NoticeAttachments();
1369         },
1370
1371         /**
1372          * Run setup code for user & group profile page header area if logged in:
1373          *
1374          * - AJAX submission for sub/unsub/join/leave/nudge
1375          * - AJAX form popup for direct-message
1376          */
1377         EntityActions: function() {
1378             if ($('body.user_in').length > 0) {
1379                 SN.U.NewDirectMessage();
1380             }
1381         },
1382
1383         /**
1384          * Run setup code for login form:
1385          *
1386          * - loads saved last-used-nickname from cookie
1387          * - sets event handler to save nickname to cookie on submit
1388          *
1389          * @fixme is this necessary? Browsers do their own form saving these days.
1390          */
1391         Login: function() {
1392             if (SN.U.StatusNetInstance.Get() !== null) {
1393                 var nickname = SN.U.StatusNetInstance.Get().Nickname;
1394                 if (nickname !== null) {
1395                     $('#form_login #nickname').val(nickname);
1396                 }
1397             }
1398
1399             $('#form_login').bind('submit', function() {
1400                 SN.U.StatusNetInstance.Set({Nickname: $('#form_login #nickname').val()});
1401                 return true;
1402             });
1403         },
1404
1405         /**
1406          * Set up any generic 'ajax' form so it submits via AJAX with auto-replacement.
1407          */
1408         AjaxForms: function() {
1409             $('form.ajax').live('submit', function() {
1410                 SN.U.FormXHR($(this));
1411                 return false;
1412             });
1413         },
1414
1415         /**
1416          * Add logic to any file upload forms to handle file size limits,
1417          * on browsers that support basic FileAPI.
1418          */
1419         UploadForms: function () {
1420             $('input[type=file]').change(function(event) {
1421                 if (typeof this.files == "object" && this.files.length > 0) {
1422                     var size = 0;
1423                     for (var i = 0; i < this.files.length; i++) {
1424                         size += this.files[i].size;
1425                     }
1426
1427                     var max = SN.U.maxFileSize($(this.form));
1428                     if (max > 0 && size > max) {
1429                         var msg = 'File too large: maximum upload size is %d bytes.';
1430                         alert(msg.replace('%d', max));
1431
1432                         // Clear the files.
1433                         $(this).val('');
1434                         event.preventDefault();
1435                         return false;
1436                     }
1437                 }
1438             });
1439         }
1440     }
1441 };
1442
1443 /**
1444  * Run initialization functions on DOM-ready.
1445  *
1446  * Note that if we're waiting on other scripts to load, this won't happen
1447  * until that's done. To load scripts asynchronously without delaying setup,
1448  * don't start them loading until after DOM-ready time!
1449  */
1450 $(document).ready(function(){
1451     SN.Init.AjaxForms();
1452     SN.Init.UploadForms();
1453     if ($('.'+SN.C.S.FormNotice).length > 0) {
1454         SN.Init.NoticeForm();
1455     }
1456     if ($('#content .notices').length > 0) {
1457         SN.Init.Notices();
1458     }
1459     if ($('#content .entity_actions').length > 0) {
1460         SN.Init.EntityActions();
1461     }
1462     if ($('#form_login').length > 0) {
1463         SN.Init.Login();
1464     }
1465 });