js/jqueryui/ui/jquery.ui.dialog.js

   1 /*
   2  * jQuery UI Dialog 1.8.4
   3  *
   4  * Copyright 2010, AUTHORS.txt (http://jqueryui.com/about)
   5  * Dual licensed under the MIT or GPL Version 2 licenses.
   6  * http://jquery.org/license
   7  *
   8  * http://docs.jquery.com/UI/Dialog
   9  *
  10  * Depends:
  11  *      jquery.ui.core.js
  12  *      jquery.ui.widget.js
  13  *  jquery.ui.button.js
  14  *      jquery.ui.draggable.js
  15  *      jquery.ui.mouse.js
  16  *      jquery.ui.position.js
  17  *      jquery.ui.resizable.js
  18  */
  19 (function( $, undefined ) {
  20
  21 var uiDialogClasses =
  22         'ui-dialog ' +
  23         'ui-widget ' +
  24         'ui-widget-content ' +
  25         'ui-corner-all ';
  26
  27 $.widget("ui.dialog", {
  28         options: {
  29                 autoOpen: true,
  30                 buttons: {},
  31                 closeOnEscape: true,
  32                 closeText: 'close',
  33                 dialogClass: '',
  34                 draggable: true,
  35                 hide: null,
  36                 height: 'auto',
  37                 maxHeight: false,
  38                 maxWidth: false,
  39                 minHeight: 150,
  40                 minWidth: 150,
  41                 modal: false,
  42                 position: {
  43                         my: 'center',
  44                         at: 'center',
  45                         of: window,
  46                         collision: 'fit',
  47                         // ensure that the titlebar is never outside the document
  48                         using: function(pos) {
  49                                 var topOffset = $(this).css(pos).offset().top;
  50                                 if (topOffset < 0) {
  51                                         $(this).css('top', pos.top - topOffset);
  52                                 }
  53                         }
  54                 },
  55                 resizable: true,
  56                 show: null,
  57                 stack: true,
  58                 title: '',
  59                 width: 300,
  60                 zIndex: 1000
  61         },
  62
  63         _create: function() {
  64                 this.originalTitle = this.element.attr('title');
  65                 // #5742 - .attr() might return a DOMElement
  66                 if ( typeof this.originalTitle !== "string" ) {
  67                         this.originalTitle = "";
  68                 }
  69
  70                 var self = this,
  71                         options = self.options,
  72
  73                         title = options.title || self.originalTitle || '&#160;',
  74                         titleId = $.ui.dialog.getTitleId(self.element),
  75
  76                         uiDialog = (self.uiDialog = $('<div></div>'))
  77                                 .appendTo(document.body)
  78                                 .hide()
  79                                 .addClass(uiDialogClasses + options.dialogClass)
  80                                 .css({
  81                                         zIndex: options.zIndex
  82                                 })
  83                                 // setting tabIndex makes the div focusable
  84                                 // setting outline to 0 prevents a border on focus in Mozilla
  85                                 .attr('tabIndex', -1).css('outline', 0).keydown(function(event) {
  86                                         if (options.closeOnEscape && event.keyCode &&
  87                                                 event.keyCode === $.ui.keyCode.ESCAPE) {
  88
  89                                                 self.close(event);
  90                                                 event.preventDefault();
  91                                         }
  92                                 })
  93                                 .attr({
  94                                         role: 'dialog',
  95                                         'aria-labelledby': titleId
  96                                 })
  97                                 .mousedown(function(event) {
  98                                         self.moveToTop(false, event);
  99                                 }),
 100
 101                         uiDialogContent = self.element
 102                                 .show()
 103                                 .removeAttr('title')
 104                                 .addClass(
 105                                         'ui-dialog-content ' +
 106                                         'ui-widget-content')
 107                                 .appendTo(uiDialog),
 108
 109                         uiDialogTitlebar = (self.uiDialogTitlebar = $('<div></div>'))
 110                                 .addClass(
 111                                         'ui-dialog-titlebar ' +
 112                                         'ui-widget-header ' +
 113                                         'ui-corner-all ' +
 114                                         'ui-helper-clearfix'
 115                                 )
 116                                 .prependTo(uiDialog),
 117
 118                         uiDialogTitlebarClose = $('<a href="#"></a>')
 119                                 .addClass(
 120                                         'ui-dialog-titlebar-close ' +
 121                                         'ui-corner-all'
 122                                 )
 123                                 .attr('role', 'button')
 124                                 .hover(
 125                                         function() {
 126                                                 uiDialogTitlebarClose.addClass('ui-state-hover');
 127                                         },
 128                                         function() {
 129                                                 uiDialogTitlebarClose.removeClass('ui-state-hover');
 130                                         }
 131                                 )
 132                                 .focus(function() {
 133                                         uiDialogTitlebarClose.addClass('ui-state-focus');
 134                                 })
 135                                 .blur(function() {
 136                                         uiDialogTitlebarClose.removeClass('ui-state-focus');
 137                                 })
 138                                 .click(function(event) {
 139                                         self.close(event);
 140                                         return false;
 141                                 })
 142                                 .appendTo(uiDialogTitlebar),
 143
 144                         uiDialogTitlebarCloseText = (self.uiDialogTitlebarCloseText = $('<span></span>'))
 145                                 .addClass(
 146                                         'ui-icon ' +
 147                                         'ui-icon-closethick'
 148                                 )
 149                                 .text(options.closeText)
 150                                 .appendTo(uiDialogTitlebarClose),
 151
 152                         uiDialogTitle = $('<span></span>')
 153                                 .addClass('ui-dialog-title')
 154                                 .attr('id', titleId)
 155                                 .html(title)
 156                                 .prependTo(uiDialogTitlebar);
 157
 158                 //handling of deprecated beforeclose (vs beforeClose) option
 159                 //Ticket #4669 http://dev.jqueryui.com/ticket/4669
 160                 //TODO: remove in 1.9pre
 161                 if ($.isFunction(options.beforeclose) && !$.isFunction(options.beforeClose)) {
 162                         options.beforeClose = options.beforeclose;
 163                 }
 164
 165                 uiDialogTitlebar.find("*").add(uiDialogTitlebar).disableSelection();
 166
 167                 if (options.draggable && $.fn.draggable) {
 168                         self._makeDraggable();
 169                 }
 170                 if (options.resizable && $.fn.resizable) {
 171                         self._makeResizable();
 172                 }
 173
 174                 self._createButtons(options.buttons);
 175                 self._isOpen = false;
 176
 177                 if ($.fn.bgiframe) {
 178                         uiDialog.bgiframe();
 179                 }
 180         },
 181
 182         _init: function() {
 183                 if ( this.options.autoOpen ) {
 184                         this.open();
 185                 }
 186         },
 187
 188         destroy: function() {
 189                 var self = this;
 190
 191                 if (self.overlay) {
 192                         self.overlay.destroy();
 193                 }
 194                 self.uiDialog.hide();
 195                 self.element
 196                         .unbind('.dialog')
 197                         .removeData('dialog')
 198                         .removeClass('ui-dialog-content ui-widget-content')
 199                         .hide().appendTo('body');
 200                 self.uiDialog.remove();
 201
 202                 if (self.originalTitle) {
 203                         self.element.attr('title', self.originalTitle);
 204                 }
 205
 206                 return self;
 207         },
 208
 209         widget: function() {
 210                 return this.uiDialog;
 211         },
 212
 213         close: function(event) {
 214                 var self = this,
 215                         maxZ;
 216
 217                 if (false === self._trigger('beforeClose', event)) {
 218                         return;
 219                 }
 220
 221                 if (self.overlay) {
 222                         self.overlay.destroy();
 223                 }
 224                 self.uiDialog.unbind('keypress.ui-dialog');
 225
 226                 self._isOpen = false;
 227
 228                 if (self.options.hide) {
 229                         self.uiDialog.hide(self.options.hide, function() {
 230                                 self._trigger('close', event);
 231                         });
 232                 } else {
 233                         self.uiDialog.hide();
 234                         self._trigger('close', event);
 235                 }
 236
 237                 $.ui.dialog.overlay.resize();
 238
 239                 // adjust the maxZ to allow other modal dialogs to continue to work (see #4309)
 240                 if (self.options.modal) {
 241                         maxZ = 0;
 242                         $('.ui-dialog').each(function() {
 243                                 if (this !== self.uiDialog[0]) {
 244                                         maxZ = Math.max(maxZ, $(this).css('z-index'));
 245                                 }
 246                         });
 247                         $.ui.dialog.maxZ = maxZ;
 248                 }
 249
 250                 return self;
 251         },
 252
 253         isOpen: function() {
 254                 return this._isOpen;
 255         },
 256
 257         // the force parameter allows us to move modal dialogs to their correct
 258         // position on open
 259         moveToTop: function(force, event) {
 260                 var self = this,
 261                         options = self.options,
 262                         saveScroll;
 263
 264                 if ((options.modal && !force) ||
 265                         (!options.stack && !options.modal)) {
 266                         return self._trigger('focus', event);
 267                 }
 268
 269                 if (options.zIndex > $.ui.dialog.maxZ) {
 270                         $.ui.dialog.maxZ = options.zIndex;
 271                 }
 272                 if (self.overlay) {
 273                         $.ui.dialog.maxZ += 1;
 274                         self.overlay.$el.css('z-index', $.ui.dialog.overlay.maxZ = $.ui.dialog.maxZ);
 275                 }
 276
 277                 //Save and then restore scroll since Opera 9.5+ resets when parent z-Index is changed.
 278                 //  http://ui.jquery.com/bugs/ticket/3193
 279                 saveScroll = { scrollTop: self.element.attr('scrollTop'), scrollLeft: self.element.attr('scrollLeft') };
 280                 $.ui.dialog.maxZ += 1;
 281                 self.uiDialog.css('z-index', $.ui.dialog.maxZ);
 282                 self.element.attr(saveScroll);
 283                 self._trigger('focus', event);
 284
 285                 return self;
 286         },
 287
 288         open: function() {
 289                 if (this._isOpen) { return; }
 290
 291                 var self = this,
 292                         options = self.options,
 293                         uiDialog = self.uiDialog;
 294
 295                 self.overlay = options.modal ? new $.ui.dialog.overlay(self) : null;
 296                 if (uiDialog.next().length) {
 297                         uiDialog.appendTo('body');
 298                 }
 299                 self._size();
 300                 self._position(options.position);
 301                 uiDialog.show(options.show);
 302                 self.moveToTop(true);
 303
 304                 // prevent tabbing out of modal dialogs
 305                 if (options.modal) {
 306                         uiDialog.bind('keypress.ui-dialog', function(event) {
 307                                 if (event.keyCode !== $.ui.keyCode.TAB) {
 308                                         return;
 309                                 }
 310
 311                                 var tabbables = $(':tabbable', this),
 312                                         first = tabbables.filter(':first'),
 313                                         last  = tabbables.filter(':last');
 314
 315                                 if (event.target === last[0] && !event.shiftKey) {
 316                                         first.focus(1);
 317                                         return false;
 318                                 } else if (event.target === first[0] && event.shiftKey) {
 319                                         last.focus(1);
 320                                         return false;
 321                                 }
 322                         });
 323                 }
 324
 325                 // set focus to the first tabbable element in the content area or the first button
 326                 // if there are no tabbable elements, set focus on the dialog itself
 327                 $(self.element.find(':tabbable').get().concat(
 328                         uiDialog.find('.ui-dialog-buttonpane :tabbable').get().concat(
 329                                 uiDialog.get()))).eq(0).focus();
 330
 331                 self._trigger('open');
 332                 self._isOpen = true;
 333
 334                 return self;
 335         },
 336
 337         _createButtons: function(buttons) {
 338                 var self = this,
 339                         hasButtons = false,
 340                         uiDialogButtonPane = $('<div></div>')
 341                                 .addClass(
 342                                         'ui-dialog-buttonpane ' +
 343                                         'ui-widget-content ' +
 344                                         'ui-helper-clearfix'
 345                                 ),
 346                         uiButtonSet = $( "<div></div>" )
 347                                 .addClass( "ui-dialog-buttonset" )
 348                                 .appendTo( uiDialogButtonPane );
 349
 350                 // if we already have a button pane, remove it
 351                 self.uiDialog.find('.ui-dialog-buttonpane').remove();
 352
 353                 if (typeof buttons === 'object' && buttons !== null) {
 354                         $.each(buttons, function() {
 355                                 return !(hasButtons = true);
 356                         });
 357                 }
 358                 if (hasButtons) {
 359                         $.each(buttons, function(name, fn) {
 360                                 var button = $('<button type="button"></button>')
 361                                         .text(name)
 362                                         .click(function() { fn.apply(self.element[0], arguments); })
 363                                         .appendTo(uiButtonSet);
 364                                 if ($.fn.button) {
 365                                         button.button();
 366                                 }
 367                         });
 368                         uiDialogButtonPane.appendTo(self.uiDialog);
 369                 }
 370         },
 371
 372         _makeDraggable: function() {
 373                 var self = this,
 374                         options = self.options,
 375                         doc = $(document),
 376                         heightBeforeDrag;
 377
 378                 function filteredUi(ui) {
 379                         return {
 380                                 position: ui.position,
 381                                 offset: ui.offset
 382                         };
 383                 }
 384
 385                 self.uiDialog.draggable({
 386                         cancel: '.ui-dialog-content, .ui-dialog-titlebar-close',
 387                         handle: '.ui-dialog-titlebar',
 388                         containment: 'document',
 389                         start: function(event, ui) {
 390                                 heightBeforeDrag = options.height === "auto" ? "auto" : $(this).height();
 391                                 $(this).height($(this).height()).addClass("ui-dialog-dragging");
 392                                 self._trigger('dragStart', event, filteredUi(ui));
 393                         },
 394                         drag: function(event, ui) {
 395                                 self._trigger('drag', event, filteredUi(ui));
 396                         },
 397                         stop: function(event, ui) {
 398                                 options.position = [ui.position.left - doc.scrollLeft(),
 399                                         ui.position.top - doc.scrollTop()];
 400                                 $(this).removeClass("ui-dialog-dragging").height(heightBeforeDrag);
 401                                 self._trigger('dragStop', event, filteredUi(ui));
 402                                 $.ui.dialog.overlay.resize();
 403                         }
 404                 });
 405         },
 406
 407         _makeResizable: function(handles) {
 408                 handles = (handles === undefined ? this.options.resizable : handles);
 409                 var self = this,
 410                         options = self.options,
 411                         // .ui-resizable has position: relative defined in the stylesheet
 412                         // but dialogs have to use absolute or fixed positioning
 413                         position = self.uiDialog.css('position'),
 414                         resizeHandles = (typeof handles === 'string' ?
 415                                 handles :
 416                                 'n,e,s,w,se,sw,ne,nw'
 417                         );
 418
 419                 function filteredUi(ui) {
 420                         return {
 421                                 originalPosition: ui.originalPosition,
 422                                 originalSize: ui.originalSize,
 423                                 position: ui.position,
 424                                 size: ui.size
 425                         };
 426                 }
 427
 428                 self.uiDialog.resizable({
 429                         cancel: '.ui-dialog-content',
 430                         containment: 'document',
 431                         alsoResize: self.element,
 432                         maxWidth: options.maxWidth,
 433                         maxHeight: options.maxHeight,
 434                         minWidth: options.minWidth,
 435                         minHeight: self._minHeight(),
 436                         handles: resizeHandles,
 437                         start: function(event, ui) {
 438                                 $(this).addClass("ui-dialog-resizing");
 439                                 self._trigger('resizeStart', event, filteredUi(ui));
 440                         },
 441                         resize: function(event, ui) {
 442                                 self._trigger('resize', event, filteredUi(ui));
 443                         },
 444                         stop: function(event, ui) {
 445                                 $(this).removeClass("ui-dialog-resizing");
 446                                 options.height = $(this).height();
 447                                 options.width = $(this).width();
 448                                 self._trigger('resizeStop', event, filteredUi(ui));
 449                                 $.ui.dialog.overlay.resize();
 450                         }
 451                 })
 452                 .css('position', position)
 453                 .find('.ui-resizable-se').addClass('ui-icon ui-icon-grip-diagonal-se');
 454         },
 455
 456         _minHeight: function() {
 457                 var options = this.options;
 458
 459                 if (options.height === 'auto') {
 460                         return options.minHeight;
 461                 } else {
 462                         return Math.min(options.minHeight, options.height);
 463                 }
 464         },
 465
 466         _position: function(position) {
 467                 var myAt = [],
 468                         offset = [0, 0],
 469                         isVisible;
 470
 471                 if (position) {
 472                         // deep extending converts arrays to objects in jQuery <= 1.3.2 :-(
 473         //              if (typeof position == 'string' || $.isArray(position)) {
 474         //                      myAt = $.isArray(position) ? position : position.split(' ');
 475
 476                         if (typeof position === 'string' || (typeof position === 'object' && '0' in position)) {
 477                                 myAt = position.split ? position.split(' ') : [position[0], position[1]];
 478                                 if (myAt.length === 1) {
 479                                         myAt[1] = myAt[0];
 480                                 }
 481
 482                                 $.each(['left', 'top'], function(i, offsetPosition) {
 483                                         if (+myAt[i] === myAt[i]) {
 484                                                 offset[i] = myAt[i];
 485                                                 myAt[i] = offsetPosition;
 486                                         }
 487                                 });
 488
 489                                 position = {
 490                                         my: myAt.join(" "),
 491                                         at: myAt.join(" "),
 492                                         offset: offset.join(" ")
 493                                 };
 494                         }
 495
 496                         position = $.extend({}, $.ui.dialog.prototype.options.position, position);
 497                 } else {
 498                         position = $.ui.dialog.prototype.options.position;
 499                 }
 500
 501                 // need to show the dialog to get the actual offset in the position plugin
 502                 isVisible = this.uiDialog.is(':visible');
 503                 if (!isVisible) {
 504                         this.uiDialog.show();
 505                 }
 506                 this.uiDialog
 507                         // workaround for jQuery bug #5781 http://dev.jquery.com/ticket/5781
 508                         .css({ top: 0, left: 0 })
 509                         .position(position);
 510                 if (!isVisible) {
 511                         this.uiDialog.hide();
 512                 }
 513         },
 514
 515         _setOption: function(key, value){
 516                 var self = this,
 517                         uiDialog = self.uiDialog,
 518                         isResizable = uiDialog.is(':data(resizable)'),
 519                         resize = false;
 520
 521                 switch (key) {
 522                         //handling of deprecated beforeclose (vs beforeClose) option
 523                         //Ticket #4669 http://dev.jqueryui.com/ticket/4669
 524                         //TODO: remove in 1.9pre
 525                         case "beforeclose":
 526                                 key = "beforeClose";
 527                                 break;
 528                         case "buttons":
 529                                 self._createButtons(value);
 530                                 resize = true;
 531                                 break;
 532                         case "closeText":
 533                                 // convert whatever was passed in to a string, for text() to not throw up
 534                                 self.uiDialogTitlebarCloseText.text("" + value);
 535                                 break;
 536                         case "dialogClass":
 537                                 uiDialog
 538                                         .removeClass(self.options.dialogClass)
 539                                         .addClass(uiDialogClasses + value);
 540                                 break;
 541                         case "disabled":
 542                                 if (value) {
 543                                         uiDialog.addClass('ui-dialog-disabled');
 544                                 } else {
 545                                         uiDialog.removeClass('ui-dialog-disabled');
 546                                 }
 547                                 break;
 548                         case "draggable":
 549                                 if (value) {
 550                                         self._makeDraggable();
 551                                 } else {
 552                                         uiDialog.draggable('destroy');
 553                                 }
 554                                 break;
 555                         case "height":
 556                                 resize = true;
 557                                 break;
 558                         case "maxHeight":
 559                                 if (isResizable) {
 560                                         uiDialog.resizable('option', 'maxHeight', value);
 561                                 }
 562                                 resize = true;
 563                                 break;
 564                         case "maxWidth":
 565                                 if (isResizable) {
 566                                         uiDialog.resizable('option', 'maxWidth', value);
 567                                 }
 568                                 resize = true;
 569                                 break;
 570                         case "minHeight":
 571                                 if (isResizable) {
 572                                         uiDialog.resizable('option', 'minHeight', value);
 573                                 }
 574                                 resize = true;
 575                                 break;
 576                         case "minWidth":
 577                                 if (isResizable) {
 578                                         uiDialog.resizable('option', 'minWidth', value);
 579                                 }
 580                                 resize = true;
 581                                 break;
 582                         case "position":
 583                                 self._position(value);
 584                                 break;
 585                         case "resizable":
 586                                 // currently resizable, becoming non-resizable
 587                                 if (isResizable && !value) {
 588                                         uiDialog.resizable('destroy');
 589                                 }
 590
 591                                 // currently resizable, changing handles
 592                                 if (isResizable && typeof value === 'string') {
 593                                         uiDialog.resizable('option', 'handles', value);
 594                                 }
 595
 596                                 // currently non-resizable, becoming resizable
 597                                 if (!isResizable && value !== false) {
 598                                         self._makeResizable(value);
 599                                 }
 600                                 break;
 601                         case "title":
 602                                 // convert whatever was passed in o a string, for html() to not throw up
 603                                 $(".ui-dialog-title", self.uiDialogTitlebar).html("" + (value || '&#160;'));
 604                                 break;
 605                         case "width":
 606                                 resize = true;
 607                                 break;
 608                 }
 609
 610                 $.Widget.prototype._setOption.apply(self, arguments);
 611                 if (resize) {
 612                         self._size();
 613                 }
 614         },
 615
 616         _size: function() {
 617                 /* If the user has resized the dialog, the .ui-dialog and .ui-dialog-content
 618                  * divs will both have width and height set, so we need to reset them
 619                  */
 620                 var options = this.options,
 621                         nonContentHeight;
 622
 623                 // reset content sizing
 624                 // hide for non content measurement because height: 0 doesn't work in IE quirks mode (see #4350)
 625                 this.element.css({
 626                         width: 'auto',
 627                         minHeight: 0,
 628                         height: 0
 629                 });
 630
 631                 if (options.minWidth > options.width) {
 632                         options.width = options.minWidth;
 633                 }
 634
 635                 // reset wrapper sizing
 636                 // determine the height of all the non-content elements
 637                 nonContentHeight = this.uiDialog.css({
 638                                 height: 'auto',
 639                                 width: options.width
 640                         })
 641                         .height();
 642
 643                 this.element
 644                         .css(options.height === 'auto' ? {
 645                                         minHeight: Math.max(options.minHeight - nonContentHeight, 0),
 646                                         height: 'auto'
 647                                 } : {
 648                                         minHeight: 0,
 649                                         height: Math.max(options.height - nonContentHeight, 0)
 650                         })
 651                         .show();
 652
 653                 if (this.uiDialog.is(':data(resizable)')) {
 654                         this.uiDialog.resizable('option', 'minHeight', this._minHeight());
 655                 }
 656         }
 657 });
 658
 659 $.extend($.ui.dialog, {
 660         version: "1.8.4",
 661
 662         uuid: 0,
 663         maxZ: 0,
 664
 665         getTitleId: function($el) {
 666                 var id = $el.attr('id');
 667                 if (!id) {
 668                         this.uuid += 1;
 669                         id = this.uuid;
 670                 }
 671                 return 'ui-dialog-title-' + id;
 672         },
 673
 674         overlay: function(dialog) {
 675                 this.$el = $.ui.dialog.overlay.create(dialog);
 676         }
 677 });
 678
 679 $.extend($.ui.dialog.overlay, {
 680         instances: [],
 681         // reuse old instances due to IE memory leak with alpha transparency (see #5185)
 682         oldInstances: [],
 683         maxZ: 0,
 684         events: $.map('focus,mousedown,mouseup,keydown,keypress,click'.split(','),
 685                 function(event) { return event + '.dialog-overlay'; }).join(' '),
 686         create: function(dialog) {
 687                 if (this.instances.length === 0) {
 688                         // prevent use of anchors and inputs
 689                         // we use a setTimeout in case the overlay is created from an
 690                         // event that we're going to be cancelling (see #2804)
 691                         setTimeout(function() {
 692                                 // handle $(el).dialog().dialog('close') (see #4065)
 693                                 if ($.ui.dialog.overlay.instances.length) {
 694                                         $(document).bind($.ui.dialog.overlay.events, function(event) {
 695                                                 // stop events if the z-index of the target is < the z-index of the overlay
 696                                                 return ($(event.target).zIndex() >= $.ui.dialog.overlay.maxZ);
 697                                         });
 698                                 }
 699                         }, 1);
 700
 701                         // allow closing by pressing the escape key
 702                         $(document).bind('keydown.dialog-overlay', function(event) {
 703                                 if (dialog.options.closeOnEscape && event.keyCode &&
 704                                         event.keyCode === $.ui.keyCode.ESCAPE) {
 705
 706                                         dialog.close(event);
 707                                         event.preventDefault();
 708                                 }
 709                         });
 710
 711                         // handle window resize
 712                         $(window).bind('resize.dialog-overlay', $.ui.dialog.overlay.resize);
 713                 }
 714
 715                 var $el = (this.oldInstances.pop() || $('<div></div>').addClass('ui-widget-overlay'))
 716                         .appendTo(document.body)
 717                         .css({
 718                                 width: this.width(),
 719                                 height: this.height()
 720                         });
 721
 722                 if ($.fn.bgiframe) {
 723                         $el.bgiframe();
 724                 }
 725
 726                 this.instances.push($el);
 727                 return $el;
 728         },
 729
 730         destroy: function($el) {
 731                 this.oldInstances.push(this.instances.splice($.inArray($el, this.instances), 1)[0]);
 732
 733                 if (this.instances.length === 0) {
 734                         $([document, window]).unbind('.dialog-overlay');
 735                 }
 736
 737                 $el.remove();
 738
 739                 // adjust the maxZ to allow other modal dialogs to continue to work (see #4309)
 740                 var maxZ = 0;
 741                 $.each(this.instances, function() {
 742                         maxZ = Math.max(maxZ, this.css('z-index'));
 743                 });
 744                 this.maxZ = maxZ;
 745         },
 746
 747         height: function() {
 748                 var scrollHeight,
 749                         offsetHeight;
 750                 // handle IE 6
 751                 if ($.browser.msie && $.browser.version < 7) {
 752                         scrollHeight = Math.max(
 753                                 document.documentElement.scrollHeight,
 754                                 document.body.scrollHeight
 755                         );
 756                         offsetHeight = Math.max(
 757                                 document.documentElement.offsetHeight,
 758                                 document.body.offsetHeight
 759                         );
 760
 761                         if (scrollHeight < offsetHeight) {
 762                                 return $(window).height() + 'px';
 763                         } else {
 764                                 return scrollHeight + 'px';
 765                         }
 766                 // handle "good" browsers
 767                 } else {
 768                         return $(document).height() + 'px';
 769                 }
 770         },
 771
 772         width: function() {
 773                 var scrollWidth,
 774                         offsetWidth;
 775                 // handle IE 6
 776                 if ($.browser.msie && $.browser.version < 7) {
 777                         scrollWidth = Math.max(
 778                                 document.documentElement.scrollWidth,
 779                                 document.body.scrollWidth
 780                         );
 781                         offsetWidth = Math.max(
 782                                 document.documentElement.offsetWidth,
 783                                 document.body.offsetWidth
 784                         );
 785
 786                         if (scrollWidth < offsetWidth) {
 787                                 return $(window).width() + 'px';
 788                         } else {
 789                                 return scrollWidth + 'px';
 790                         }
 791                 // handle "good" browsers
 792                 } else {
 793                         return $(document).width() + 'px';
 794                 }
 795         },
 796
 797         resize: function() {
 798                 /* If the dialog is draggable and the user drags it past the
 799                  * right edge of the window, the document becomes wider so we
 800                  * need to stretch the overlay. If the user then drags the
 801                  * dialog back to the left, the document will become narrower,
 802                  * so we need to shrink the overlay to the appropriate size.
 803                  * This is handled by shrinking the overlay before setting it
 804                  * to the full document size.
 805                  */
 806                 var $overlays = $([]);
 807                 $.each($.ui.dialog.overlay.instances, function() {
 808                         $overlays = $overlays.add(this);
 809                 });
 810
 811                 $overlays.css({
 812                         width: 0,
 813                         height: 0
 814                 }).css({
 815                         width: $.ui.dialog.overlay.width(),
 816                         height: $.ui.dialog.overlay.height()
 817                 });
 818         }
 819 });
 820
 821 $.extend($.ui.dialog.overlay.prototype, {
 822         destroy: function() {
 823                 $.ui.dialog.overlay.destroy(this.$el);
 824         }
 825 });
 826
 827 }(jQuery));