https://www.hussainiat.com/jquery/ui/external/bgiframe/jquery.bgiframe.js

1/* Copyright (c) 2006 Brandon Aaron (http://brandonaaron.net)
2 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) 
3 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
4 *
5 * $LastChangedDate: 2007-07-21 18:44:59 -0500 (Sat, 21 Jul 2007) $
6 * $Rev: 2446 $
7 *
8 * Version 2.1.1
9 */
10
11(function($){
12
13/**
14 * The bgiframe is chainable and applies the iframe hack to get 
15 * around zIndex issues in IE6. It will only apply itself in IE6 
16 * and adds a class to the iframe called 'bgiframe'. The iframe
17 * is appeneded as the first child of the matched element(s) 
18 * with a tabIndex and zIndex of -1.
19 * 
20 * By default the plugin will take borders, sized with pixel units,
21 * into account. If a different unit is used for the border's width,
22 * then you will need to use the top and left settings as explained below.
23 *
24 * NOTICE: This plugin has been reported to cause perfromance problems
25 * when used on elements that change properties (like width, height and
26 * opacity) a lot in IE6. Most of these problems have been caused by 
27 * the expressions used to calculate the elements width, height and 
28 * borders. Some have reported it is due to the opacity filter. All 
29 * these settings can be changed if needed as explained below.
30 *
31 * @example $('div').bgiframe();
32 * @before <div><p>Paragraph</p></div>
33 * @result <div><iframe class="bgiframe".../><p>Paragraph</p></div>
34 *
35 * @param Map settings Optional settings to configure the iframe.
36 * @option String|Number top The iframe must be offset to the top
37 * 		by the width of the top border. This should be a negative 
38 *      number representing the border-top-width. If a number is 
39 * 		is used here, pixels will be assumed. Otherwise, be sure
40 *		to specify a unit. An expression could also be used. 
41 * 		By default the value is "auto" which will use an expression 
42 * 		to get the border-top-width if it is in pixels.
43 * @option String|Number left The iframe must be offset to the left
44 * 		by the width of the left border. This should be a negative 
45 *      number representing the border-left-width. If a number is 
46 * 		is used here, pixels will be assumed. Otherwise, be sure
47 *		to specify a unit. An expression could also be used. 
48 * 		By default the value is "auto" which will use an expression 
49 * 		to get the border-left-width if it is in pixels.
50 * @option String|Number width This is the width of the iframe. If
51 *		a number is used here, pixels will be assume. Otherwise, be sure
52 * 		to specify a unit. An experssion could also be used.
53 *		By default the value is "auto" which will use an experssion
54 * 		to get the offsetWidth.
55 * @option String|Number height This is the height of the iframe. If
56 *		a number is used here, pixels will be assume. Otherwise, be sure
57 * 		to specify a unit. An experssion could also be used.
58 *		By default the value is "auto" which will use an experssion
59 * 		to get the offsetHeight.
60 * @option Boolean opacity This is a boolean representing whether or not
61 * 		to use opacity. If set to true, the opacity of 0 is applied. If
62 *		set to false, the opacity filter is not applied. Default: true.
63 * @option String src This setting is provided so that one could change 
64 *		the src of the iframe to whatever they need.
65 *		Default: "javascript:false;"
66 *
67 * @name bgiframe
68 * @type jQuery
69 * @cat Plugins/bgiframe
70 * @author Brandon Aaron ([email protected] || http://brandonaaron.net)
71 */
72$.fn.bgIframe = $.fn.bgiframe = function(s) {
73	// This is only for IE6
74	if ( $.browser.msie && /6.0/.test(navigator.userAgent) ) {
75		s = $.extend({
76			top     : 'auto', // auto == .currentStyle.borderTopWidth
77			left    : 'auto', // auto == .currentStyle.borderLeftWidth
78			width   : 'auto', // auto == offsetWidth
79			height  : 'auto', // auto == offsetHeight
80			opacity : true,
81			src     : 'javascript:false;'
82		}, s || {});
83		var prop = function(n){return n&&n.constructor==Number?n+'px':n;},
84		    html = '<iframe class="bgiframe"frameborder="0"tabindex="-1"src="'+s.src+'"'+
85		               'style="display:block;position:absolute;z-index:-1;'+

86			               (s.opacity !== false?'filter:Alpha(Opacity=\'0\');':'')+
87					       'top:'+(s.top=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderTopWidth)||0)*-1)+\'px\')':prop(s.top))+';'+
88					       'left:'+(s.left=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderLeftWidth)||0)*-1)+\'px\')':prop(s.left))+';'+
89					       'width:'+(s.width=='auto'?'expression(this.parentNode.offsetWidth+\'px\')':prop(s.width))+';'+
90					       'height:'+(s.height=='auto'?'expression(this.parentNode.offsetHeight+\'px\')':prop(s.height))+';'+
91					'"/>';
92		return this.each(function() {
93			if ( $('> iframe.bgiframe', this).length == 0 )
94				this.insertBefore( document.createElement(html), this.firstChild );
95		});
96	}
97	return this;
98};
99
100})(jQuery);