X-Git-Url: http://git.cyclocoop.org/?p=velocampus%2Fweb%2Fwww.git;a=blobdiff_plain;f=www%2Fprive%2Fjavascript%2Fbgiframe.js;fp=www%2Fprive%2Fjavascript%2Fbgiframe.js;h=c2a180561a3f06c5093f9f8cf153661e78ac383a;hp=0000000000000000000000000000000000000000;hb=80b4d3e85f78d402ed2e73f8f5d1bf4c19962eed;hpb=aaf970bf4cdaf76689ecc10609048e18d073820c

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