/* Copyright (c) 2006 Brandon Aaron (http://brandonaaron.net)
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* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
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* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
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*
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* $LastChangedDate: 2007-07-21 18:44:59 -0500 (Sat, 21 Jul 2007) $
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* $Rev: 2446 $
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*
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* Version 2.1.1
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*/
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(function($){
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/**
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* The bgiframe is chainable and applies the iframe hack to get
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* around zIndex issues in IE6. It will only apply itself in IE6
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* and adds a class to the iframe called 'bgiframe'. The iframe
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* is appeneded as the first child of the matched element(s)
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* with a tabIndex and zIndex of -1.
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*
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* By default the plugin will take borders, sized with pixel units,
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* into account. If a different unit is used for the border's width,
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* then you will need to use the top and left settings as explained below.
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*
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* NOTICE: This plugin has been reported to cause perfromance problems
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* when used on elements that change properties (like width, height and
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* opacity) a lot in IE6. Most of these problems have been caused by
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* the expressions used to calculate the elements width, height and
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* borders. Some have reported it is due to the opacity filter. All
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* these settings can be changed if needed as explained below.
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*
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* @example $('div').bgiframe();
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* @before <div><p>Paragraph</p></div>
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* @result <div><iframe class="bgiframe".../><p>Paragraph</p></div>
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*
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* @param Map settings Optional settings to configure the iframe.
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* @option String|Number top The iframe must be offset to the top
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* by the width of the top border. This should be a negative
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* number representing the border-top-width. If a number is
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* is used here, pixels will be assumed. Otherwise, be sure
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* to specify a unit. An expression could also be used.
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* By default the value is "auto" which will use an expression
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* to get the border-top-width if it is in pixels.
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* @option String|Number left The iframe must be offset to the left
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* by the width of the left border. This should be a negative
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* number representing the border-left-width. If a number is
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* is used here, pixels will be assumed. Otherwise, be sure
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* to specify a unit. An expression could also be used.
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* By default the value is "auto" which will use an expression
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* to get the border-left-width if it is in pixels.
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* @option String|Number width This is the width of the iframe. If
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* a number is used here, pixels will be assume. Otherwise, be sure
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* to specify a unit. An experssion could also be used.
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* By default the value is "auto" which will use an experssion
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* to get the offsetWidth.
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* @option String|Number height This is the height of the iframe. If
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* a number is used here, pixels will be assume. Otherwise, be sure
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* to specify a unit. An experssion could also be used.
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* By default the value is "auto" which will use an experssion
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* to get the offsetHeight.
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* @option Boolean opacity This is a boolean representing whether or not
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* to use opacity. If set to true, the opacity of 0 is applied. If
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* set to false, the opacity filter is not applied. Default: true.
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* @option String src This setting is provided so that one could change
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* the src of the iframe to whatever they need.
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* Default: "javascript:false;"
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*
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* @name bgiframe
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* @type jQuery
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* @cat Plugins/bgiframe
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* @author Brandon Aaron (brandon.aaron@gmail.com || http://brandonaaron.net)
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*/
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$.fn.bgIframe = $.fn.bgiframe = function(s) {
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// This is only for IE6
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if ( $.browser.msie && /6.0/.test(navigator.userAgent) ) {
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s = $.extend({
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top : 'auto', // auto == .currentStyle.borderTopWidth
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left : 'auto', // auto == .currentStyle.borderLeftWidth
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width : 'auto', // auto == offsetWidth
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height : 'auto', // auto == offsetHeight
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opacity : true,
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src : 'javascript:false;'
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}, s || {});
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var prop = function(n){return n&&n.constructor==Number?n+'px':n;},
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html = '<iframe class="bgiframe"frameborder="0"tabindex="-1"src="'+s.src+'"'+
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'style="display:block;position:absolute;z-index:-1;'+
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(s.opacity !== false?'filter:Alpha(Opacity=\'0\');':'')+
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'top:'+(s.top=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderTopWidth)||0)*-1)+\'px\')':prop(s.top))+';'+
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'left:'+(s.left=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderLeftWidth)||0)*-1)+\'px\')':prop(s.left))+';'+
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'width:'+(s.width=='auto'?'expression(this.parentNode.offsetWidth+\'px\')':prop(s.width))+';'+
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'height:'+(s.height=='auto'?'expression(this.parentNode.offsetHeight+\'px\')':prop(s.height))+';'+
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'"/>';
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//return this.each(function() {
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//if ( $('> iframe.bgiframe', this).length == 0 )
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// this.insertBefore( document.createElement(html), this.firstChild );
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//});
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}
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return this;
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};
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})(jQuery);
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