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