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