resources/jquery.ui/jquery.ui.dialog.js

   1 /*
   2  * jQuery UI Dialog 1.8.2
   3  *
   4  * Copyright (c) 2010 AUTHORS.txt (http://jqueryui.com/about)
   5  * Dual licensed under the MIT (MIT-LICENSE.txt)
   6  * and GPL (GPL-LICENSE.txt) licenses.
   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($) {
  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: 'center',
  43                 resizable: true,
  44                 show: null,
  45                 stack: true,
  46                 title: '',
  47                 width: 300,
  48                 zIndex: 1000
  49         },
  50         _create: function() {
  51                 this.originalTitle = this.element.attr('title');
  52
  53                 var self = this,
  54                         options = self.options,
  55
  56                         title = options.title || self.originalTitle || '&#160;',
  57                         titleId = $.ui.dialog.getTitleId(self.element),
  58
  59                         uiDialog = (self.uiDialog = $('<div></div>'))
  60                                 .appendTo(document.body)
  61                                 .hide()
  62                                 .addClass(uiDialogClasses + options.dialogClass)
  63                                 .css({
  64                                         zIndex: options.zIndex
  65                                 })
  66                                 // setting tabIndex makes the div focusable
  67                                 // setting outline to 0 prevents a border on focus in Mozilla
  68                                 .attr('tabIndex', -1).css('outline', 0).keydown(function(event) {
  69                                         if (options.closeOnEscape && event.keyCode &&
  70                                                 event.keyCode === $.ui.keyCode.ESCAPE) {
  71
  72                                                 self.close(event);
  73                                                 event.preventDefault();
  74                                         }
  75                                 })
  76                                 .attr({
  77                                         role: 'dialog',
  78                                         'aria-labelledby': titleId
  79                                 })
  80                                 .mousedown(function(event) {
  81                                         self.moveToTop(false, event);
  82                                 }),
  83
  84                         uiDialogContent = self.element
  85                                 .show()
  86                                 .removeAttr('title')
  87                                 .addClass(
  88                                         'ui-dialog-content ' +
  89                                         'ui-widget-content')
  90                                 .appendTo(uiDialog),
  91
  92                         uiDialogTitlebar = (self.uiDialogTitlebar = $('<div></div>'))
  93                                 .addClass(
  94                                         'ui-dialog-titlebar ' +
  95                                         'ui-widget-header ' +
  96                                         'ui-corner-all ' +
  97                                         'ui-helper-clearfix'
  98                                 )
  99                                 .prependTo(uiDialog),
 100
 101                         uiDialogTitlebarClose = $('<a href="#"></a>')
 102                                 .addClass(
 103                                         'ui-dialog-titlebar-close ' +
 104                                         'ui-corner-all'
 105                                 )
 106                                 .attr('role', 'button')
 107                                 .hover(
 108                                         function() {
 109                                                 uiDialogTitlebarClose.addClass('ui-state-hover');
 110                                         },
 111                                         function() {
 112                                                 uiDialogTitlebarClose.removeClass('ui-state-hover');
 113                                         }
 114                                 )
 115                                 .focus(function() {
 116                                         uiDialogTitlebarClose.addClass('ui-state-focus');
 117                                 })
 118                                 .blur(function() {
 119                                         uiDialogTitlebarClose.removeClass('ui-state-focus');
 120                                 })
 121                                 .click(function(event) {
 122                                         self.close(event);
 123                                         return false;
 124                                 })
 125                                 .appendTo(uiDialogTitlebar),
 126
 127                         uiDialogTitlebarCloseText = (self.uiDialogTitlebarCloseText = $('<span></span>'))
 128                                 .addClass(
 129                                         'ui-icon ' +
 130                                         'ui-icon-closethick'
 131                                 )
 132                                 .text(options.closeText)
 133                                 .appendTo(uiDialogTitlebarClose),
 134
 135                         uiDialogTitle = $('<span></span>')
 136                                 .addClass('ui-dialog-title')
 137                                 .attr('id', titleId)
 138                                 .html(title)
 139                                 .prependTo(uiDialogTitlebar);
 140
 141                 //handling of deprecated beforeclose (vs beforeClose) option
 142                 //Ticket #4669 http://dev.jqueryui.com/ticket/4669
 143                 //TODO: remove in 1.9pre
 144                 if ($.isFunction(options.beforeclose) && !$.isFunction(options.beforeClose)) {
 145                         options.beforeClose = options.beforeclose;
 146                 }
 147
 148                 uiDialogTitlebar.find("*").add(uiDialogTitlebar).disableSelection();
 149
 150                 if (options.draggable && $.fn.draggable) {
 151                         self._makeDraggable();
 152                 }
 153                 if (options.resizable && $.fn.resizable) {
 154                         self._makeResizable();
 155                 }
 156
 157                 self._createButtons(options.buttons);
 158                 self._isOpen = false;
 159
 160                 if ($.fn.bgiframe) {
 161                         uiDialog.bgiframe();
 162                 }
 163         },
 164         _init: function() {
 165                 if ( this.options.autoOpen ) {
 166                         this.open();
 167                 }
 168         },
 169
 170         destroy: function() {
 171                 var self = this;
 172
 173                 if (self.overlay) {
 174                         self.overlay.destroy();
 175                 }
 176                 self.uiDialog.hide();
 177                 self.element
 178                         .unbind('.dialog')
 179                         .removeData('dialog')
 180                         .removeClass('ui-dialog-content ui-widget-content')
 181                         .hide().appendTo('body');
 182                 self.uiDialog.remove();
 183
 184                 if (self.originalTitle) {
 185                         self.element.attr('title', self.originalTitle);
 186                 }
 187
 188                 return self;
 189         },
 190
 191         widget: function() {
 192                 return this.uiDialog;
 193         },
 194
 195         close: function(event) {
 196                 var self = this,
 197                         maxZ;
 198
 199                 if (false === self._trigger('beforeClose', event)) {
 200                         return;
 201                 }
 202
 203                 if (self.overlay) {
 204                         self.overlay.destroy();
 205                 }
 206                 self.uiDialog.unbind('keypress.ui-dialog');
 207
 208                 self._isOpen = false;
 209
 210                 if (self.options.hide) {
 211                         self.uiDialog.hide(self.options.hide, function() {
 212                                 self._trigger('close', event);
 213                         });
 214                 } else {
 215                         self.uiDialog.hide();
 216                         self._trigger('close', event);
 217                 }
 218
 219                 $.ui.dialog.overlay.resize();
 220
 221                 // adjust the maxZ to allow other modal dialogs to continue to work (see #4309)
 222                 if (self.options.modal) {
 223                         maxZ = 0;
 224                         $('.ui-dialog').each(function() {
 225                                 if (this !== self.uiDialog[0]) {
 226                                         maxZ = Math.max(maxZ, $(this).css('z-index'));
 227                                 }
 228                         });
 229                         $.ui.dialog.maxZ = maxZ;
 230                 }
 231
 232                 return self;
 233         },
 234
 235         isOpen: function() {
 236                 return this._isOpen;
 237         },
 238
 239         // the force parameter allows us to move modal dialogs to their correct
 240         // position on open
 241         moveToTop: function(force, event) {
 242                 var self = this,
 243                         options = self.options,
 244                         saveScroll;
 245
 246                 if ((options.modal && !force) ||
 247                         (!options.stack && !options.modal)) {
 248                         return self._trigger('focus', event);
 249                 }
 250
 251                 if (options.zIndex > $.ui.dialog.maxZ) {
 252                         $.ui.dialog.maxZ = options.zIndex;
 253                 }
 254                 if (self.overlay) {
 255                         $.ui.dialog.maxZ += 1;
 256                         self.overlay.$el.css('z-index', $.ui.dialog.overlay.maxZ = $.ui.dialog.maxZ);
 257                 }
 258
 259                 //Save and then restore scroll since Opera 9.5+ resets when parent z-Index is changed.
 260                 //  http://ui.jquery.com/bugs/ticket/3193
 261                 saveScroll = { scrollTop: self.element.attr('scrollTop'), scrollLeft: self.element.attr('scrollLeft') };
 262                 $.ui.dialog.maxZ += 1;
 263                 self.uiDialog.css('z-index', $.ui.dialog.maxZ);
 264                 self.element.attr(saveScroll);
 265                 self._trigger('focus', event);
 266
 267                 return self;
 268         },
 269
 270         open: function() {
 271                 if (this._isOpen) { return; }
 272
 273                 var self = this,
 274                         options = self.options,
 275                         uiDialog = self.uiDialog;
 276
 277                 self.overlay = options.modal ? new $.ui.dialog.overlay(self) : null;
 278                 if (uiDialog.next().length) {
 279                         uiDialog.appendTo('body');
 280                 }
 281                 self._size();
 282                 self._position(options.position);
 283                 uiDialog.show(options.show);
 284                 self.moveToTop(true);
 285
 286                 // prevent tabbing out of modal dialogs
 287                 if (options.modal) {
 288                         uiDialog.bind('keypress.ui-dialog', function(event) {
 289                                 if (event.keyCode !== $.ui.keyCode.TAB) {
 290                                         return;
 291                                 }
 292
 293                                 var tabbables = $(':tabbable', this),
 294                                         first = tabbables.filter(':first'),
 295                                         last  = tabbables.filter(':last');
 296
 297                                 if (event.target === last[0] && !event.shiftKey) {
 298                                         first.focus(1);
 299                                         return false;
 300                                 } else if (event.target === first[0] && event.shiftKey) {
 301                                         last.focus(1);
 302                                         return false;
 303                                 }
 304                         });
 305                 }
 306
 307                 // set focus to the first tabbable element in the content area or the first button
 308                 // if there are no tabbable elements, set focus on the dialog itself
 309                 $([])
 310                         .add(uiDialog.find('.ui-dialog-content :tabbable:first'))
 311                         .add(uiDialog.find('.ui-dialog-buttonpane :tabbable:first'))
 312                         .add(uiDialog)
 313                         .filter(':first')
 314                         .focus();
 315
 316                 self._trigger('open');
 317                 self._isOpen = true;
 318
 319                 return self;
 320         },
 321
 322         _createButtons: function(buttons) {
 323                 var self = this,
 324                         hasButtons = false,
 325                         uiDialogButtonPane = $('<div></div>')
 326                                 .addClass(
 327                                         'ui-dialog-buttonpane ' +
 328                                         'ui-widget-content ' +
 329                                         'ui-helper-clearfix'
 330                                 );
 331
 332                 // if we already have a button pane, remove it
 333                 self.uiDialog.find('.ui-dialog-buttonpane').remove();
 334
 335                 if (typeof buttons === 'object' && buttons !== null) {
 336                         $.each(buttons, function() {
 337                                 return !(hasButtons = true);
 338                         });
 339                 }
 340                 if (hasButtons) {
 341                         $.each(buttons, function(name, fn) {
 342                                 var button = $('<button type="button"></button>')
 343                                         .text(name)
 344                                         .click(function() { fn.apply(self.element[0], arguments); })
 345                                         .appendTo(uiDialogButtonPane);
 346                                 if ($.fn.button) {
 347                                         button.button();
 348                                 }
 349                         });
 350                         uiDialogButtonPane.appendTo(self.uiDialog);
 351                 }
 352         },
 353
 354         _makeDraggable: function() {
 355                 var self = this,
 356                         options = self.options,
 357                         doc = $(document),
 358                         heightBeforeDrag;
 359
 360                 function filteredUi(ui) {
 361                         return {
 362                                 position: ui.position,
 363                                 offset: ui.offset
 364                         };
 365                 }
 366
 367                 self.uiDialog.draggable({
 368                         cancel: '.ui-dialog-content, .ui-dialog-titlebar-close',
 369                         handle: '.ui-dialog-titlebar',
 370                         containment: 'document',
 371                         start: function(event, ui) {
 372                                 heightBeforeDrag = options.height === "auto" ? "auto" : $(this).height();
 373                                 $(this).height($(this).height()).addClass("ui-dialog-dragging");
 374                                 self._trigger('dragStart', event, filteredUi(ui));
 375                         },
 376                         drag: function(event, ui) {
 377                                 self._trigger('drag', event, filteredUi(ui));
 378                         },
 379                         stop: function(event, ui) {
 380                                 options.position = [ui.position.left - doc.scrollLeft(),
 381                                         ui.position.top - doc.scrollTop()];
 382                                 $(this).removeClass("ui-dialog-dragging").height(heightBeforeDrag);
 383                                 self._trigger('dragStop', event, filteredUi(ui));
 384                                 $.ui.dialog.overlay.resize();
 385                         }
 386                 });
 387         },
 388
 389         _makeResizable: function(handles) {
 390                 handles = (handles === undefined ? this.options.resizable : handles);
 391                 var self = this,
 392                         options = self.options,
 393                         // .ui-resizable has position: relative defined in the stylesheet
 394                         // but dialogs have to use absolute or fixed positioning
 395                         position = self.uiDialog.css('position'),
 396                         resizeHandles = (typeof handles === 'string' ?
 397                                 handles :
 398                                 'n,e,s,w,se,sw,ne,nw'
 399                         );
 400
 401                 function filteredUi(ui) {
 402                         return {
 403                                 originalPosition: ui.originalPosition,
 404                                 originalSize: ui.originalSize,
 405                                 position: ui.position,
 406                                 size: ui.size
 407                         };
 408                 }
 409
 410                 self.uiDialog.resizable({
 411                         cancel: '.ui-dialog-content',
 412                         containment: 'document',
 413                         alsoResize: self.element,
 414                         maxWidth: options.maxWidth,
 415                         maxHeight: options.maxHeight,
 416                         minWidth: options.minWidth,
 417                         minHeight: self._minHeight(),
 418                         handles: resizeHandles,
 419                         start: function(event, ui) {
 420                                 $(this).addClass("ui-dialog-resizing");
 421                                 self._trigger('resizeStart', event, filteredUi(ui));
 422                         },
 423                         resize: function(event, ui) {
 424                                 self._trigger('resize', event, filteredUi(ui));
 425                         },
 426                         stop: function(event, ui) {
 427                                 $(this).removeClass("ui-dialog-resizing");
 428                                 options.height = $(this).height();
 429                                 options.width = $(this).width();
 430                                 self._trigger('resizeStop', event, filteredUi(ui));
 431                                 $.ui.dialog.overlay.resize();
 432                         }
 433                 })
 434                 .css('position', position)
 435                 .find('.ui-resizable-se').addClass('ui-icon ui-icon-grip-diagonal-se');
 436         },
 437
 438         _minHeight: function() {
 439                 var options = this.options;
 440
 441                 if (options.height === 'auto') {
 442                         return options.minHeight;
 443                 } else {
 444                         return Math.min(options.minHeight, options.height);
 445                 }
 446         },
 447
 448         _position: function(position) {
 449                 var myAt = [],
 450                         offset = [0, 0],
 451                         isVisible;
 452
 453                 position = position || $.ui.dialog.prototype.options.position;
 454
 455                 // deep extending converts arrays to objects in jQuery <= 1.3.2 :-(
 456 //              if (typeof position == 'string' || $.isArray(position)) {
 457 //                      myAt = $.isArray(position) ? position : position.split(' ');
 458
 459                 if (typeof position === 'string' || (typeof position === 'object' && '0' in position)) {
 460                         myAt = position.split ? position.split(' ') : [position[0], position[1]];
 461                         if (myAt.length === 1) {
 462                                 myAt[1] = myAt[0];
 463                         }
 464
 465                         $.each(['left', 'top'], function(i, offsetPosition) {
 466                                 if (+myAt[i] === myAt[i]) {
 467                                         offset[i] = myAt[i];
 468                                         myAt[i] = offsetPosition;
 469                                 }
 470                         });
 471                 } else if (typeof position === 'object') {
 472                         if ('left' in position) {
 473                                 myAt[0] = 'left';
 474                                 offset[0] = position.left;
 475                         } else if ('right' in position) {
 476                                 myAt[0] = 'right';
 477                                 offset[0] = -position.right;
 478                         }
 479
 480                         if ('top' in position) {
 481                                 myAt[1] = 'top';
 482                                 offset[1] = position.top;
 483                         } else if ('bottom' in position) {
 484                                 myAt[1] = 'bottom';
 485                                 offset[1] = -position.bottom;
 486                         }
 487                 }
 488
 489                 // need to show the dialog to get the actual offset in the position plugin
 490                 isVisible = this.uiDialog.is(':visible');
 491                 if (!isVisible) {
 492                         this.uiDialog.show();
 493                 }
 494                 this.uiDialog
 495                         // workaround for jQuery bug #5781 http://dev.jquery.com/ticket/5781
 496                         .css({ top: 0, left: 0 })
 497                         .position({
 498                                 my: myAt.join(' '),
 499                                 at: myAt.join(' '),
 500                                 offset: offset.join(' '),
 501                                 of: window,
 502                                 collision: 'fit',
 503                                 // ensure that the titlebar is never outside the document
 504                                 using: function(pos) {
 505                                         var topOffset = $(this).css(pos).offset().top;
 506                                         if (topOffset < 0) {
 507                                                 $(this).css('top', pos.top - topOffset);
 508                                         }
 509                                 }
 510                         });
 511                 if (!isVisible) {
 512                         this.uiDialog.hide();
 513                 }
 514         },
 515
 516         _setOption: function(key, value){
 517                 var self = this,
 518                         uiDialog = self.uiDialog,
 519                         isResizable = uiDialog.is(':data(resizable)'),
 520                         resize = false;
 521
 522                 switch (key) {
 523                         //handling of deprecated beforeclose (vs beforeClose) option
 524                         //Ticket #4669 http://dev.jqueryui.com/ticket/4669
 525                         //TODO: remove in 1.9pre
 526                         case "beforeclose":
 527                                 key = "beforeClose";
 528                                 break;
 529                         case "buttons":
 530                                 self._createButtons(value);
 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                 // reset wrapper sizing
 632                 // determine the height of all the non-content elements
 633                 nonContentHeight = this.uiDialog.css({
 634                                 height: 'auto',
 635                                 width: options.width
 636                         })
 637                         .height();
 638
 639                 this.element
 640                         .css(options.height === 'auto' ? {
 641                                         minHeight: Math.max(options.minHeight - nonContentHeight, 0),
 642                                         height: 'auto'
 643                                 } : {
 644                                         minHeight: 0,
 645                                         height: Math.max(options.height - nonContentHeight, 0)
 646                         })
 647                         .show();
 648
 649                 if (this.uiDialog.is(':data(resizable)')) {
 650                         this.uiDialog.resizable('option', 'minHeight', this._minHeight());
 651                 }
 652         }
 653 });
 654
 655 $.extend($.ui.dialog, {
 656         version: "1.8.2",
 657
 658         uuid: 0,
 659         maxZ: 0,
 660
 661         getTitleId: function($el) {
 662                 var id = $el.attr('id');
 663                 if (!id) {
 664                         this.uuid += 1;
 665                         id = this.uuid;
 666                 }
 667                 return 'ui-dialog-title-' + id;
 668         },
 669
 670         overlay: function(dialog) {
 671                 this.$el = $.ui.dialog.overlay.create(dialog);
 672         }
 673 });
 674
 675 $.extend($.ui.dialog.overlay, {
 676         instances: [],
 677         // reuse old instances due to IE memory leak with alpha transparency (see #5185)
 678         oldInstances: [],
 679         maxZ: 0,
 680         events: $.map('focus,mousedown,mouseup,keydown,keypress,click'.split(','),
 681                 function(event) { return event + '.dialog-overlay'; }).join(' '),
 682         create: function(dialog) {
 683                 if (this.instances.length === 0) {
 684                         // prevent use of anchors and inputs
 685                         // we use a setTimeout in case the overlay is created from an
 686                         // event that we're going to be cancelling (see #2804)
 687                         setTimeout(function() {
 688                                 // handle $(el).dialog().dialog('close') (see #4065)
 689                                 if ($.ui.dialog.overlay.instances.length) {
 690                                         $(document).bind($.ui.dialog.overlay.events, function(event) {
 691                                                 // stop events if the z-index of the target is < the z-index of the overlay
 692                                                 return ($(event.target).zIndex() >= $.ui.dialog.overlay.maxZ);
 693                                         });
 694                                 }
 695                         }, 1);
 696
 697                         // allow closing by pressing the escape key
 698                         $(document).bind('keydown.dialog-overlay', function(event) {
 699                                 if (dialog.options.closeOnEscape && event.keyCode &&
 700                                         event.keyCode === $.ui.keyCode.ESCAPE) {
 701
 702                                         dialog.close(event);
 703                                         event.preventDefault();
 704                                 }
 705                         });
 706
 707                         // handle window resize
 708                         $(window).bind('resize.dialog-overlay', $.ui.dialog.overlay.resize);
 709                 }
 710
 711                 var $el = (this.oldInstances.pop() || $('<div></div>').addClass('ui-widget-overlay'))
 712                         .appendTo(document.body)
 713                         .css({
 714                                 width: this.width(),
 715                                 height: this.height()
 716                         });
 717
 718                 if ($.fn.bgiframe) {
 719                         $el.bgiframe();
 720                 }
 721
 722                 this.instances.push($el);
 723                 return $el;
 724         },
 725
 726         destroy: function($el) {
 727                 this.oldInstances.push(this.instances.splice($.inArray($el, this.instances), 1)[0]);
 728
 729                 if (this.instances.length === 0) {
 730                         $([document, window]).unbind('.dialog-overlay');
 731                 }
 732
 733                 $el.remove();
 734
 735                 // adjust the maxZ to allow other modal dialogs to continue to work (see #4309)
 736                 var maxZ = 0;
 737                 $.each(this.instances, function() {
 738                         maxZ = Math.max(maxZ, this.css('z-index'));
 739                 });
 740                 this.maxZ = maxZ;
 741         },
 742
 743         height: function() {
 744                 var scrollHeight,
 745                         offsetHeight;
 746                 // handle IE 6
 747                 if ($.browser.msie && $.browser.version < 7) {
 748                         scrollHeight = Math.max(
 749                                 document.documentElement.scrollHeight,
 750                                 document.body.scrollHeight
 751                         );
 752                         offsetHeight = Math.max(
 753                                 document.documentElement.offsetHeight,
 754                                 document.body.offsetHeight
 755                         );
 756
 757                         if (scrollHeight < offsetHeight) {
 758                                 return $(window).height() + 'px';
 759                         } else {
 760                                 return scrollHeight + 'px';
 761                         }
 762                 // handle "good" browsers
 763                 } else {
 764                         return $(document).height() + 'px';
 765                 }
 766         },
 767
 768         width: function() {
 769                 var scrollWidth,
 770                         offsetWidth;
 771                 // handle IE 6
 772                 if ($.browser.msie && $.browser.version < 7) {
 773                         scrollWidth = Math.max(
 774                                 document.documentElement.scrollWidth,
 775                                 document.body.scrollWidth
 776                         );
 777                         offsetWidth = Math.max(
 778                                 document.documentElement.offsetWidth,
 779                                 document.body.offsetWidth
 780                         );
 781
 782                         if (scrollWidth < offsetWidth) {
 783                                 return $(window).width() + 'px';
 784                         } else {
 785                                 return scrollWidth + 'px';
 786                         }
 787                 // handle "good" browsers
 788                 } else {
 789                         return $(document).width() + 'px';
 790                 }
 791         },
 792
 793         resize: function() {
 794                 /* If the dialog is draggable and the user drags it past the
 795                  * right edge of the window, the document becomes wider so we
 796                  * need to stretch the overlay. If the user then drags the
 797                  * dialog back to the left, the document will become narrower,
 798                  * so we need to shrink the overlay to the appropriate size.
 799                  * This is handled by shrinking the overlay before setting it
 800                  * to the full document size.
 801                  */
 802                 var $overlays = $([]);
 803                 $.each($.ui.dialog.overlay.instances, function() {
 804                         $overlays = $overlays.add(this);
 805                 });
 806
 807                 $overlays.css({
 808                         width: 0,
 809                         height: 0
 810                 }).css({
 811                         width: $.ui.dialog.overlay.width(),
 812                         height: $.ui.dialog.overlay.height()
 813                 });
 814         }
 815 });
 816
 817 $.extend($.ui.dialog.overlay.prototype, {
 818         destroy: function() {
 819                 $.ui.dialog.overlay.destroy(this.$el);
 820         }
 821 });
 822
 823 }(jQuery));