X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=src%2Fsupport.js;h=f502811ae8d8b78d0424caa4c1e1aca24e396540;hb=0cbe4cb8bdce9eacd2b63de6e9ca0b662606b633;hp=85deb1b98908a3c2aeb05fb8ff601fa54676b44b;hpb=5057ff9f43017f673894584358ca95c8753b65d4;p=jquery.git

diff --git a/src/support.js b/src/support.js
index 85deb1b..f502811 100644
--- a/src/support.js
+++ b/src/support.js
@@ -4,10 +4,7 @@
 
 	jQuery.support = {};
 
-	var root = document.documentElement,
-		script = document.createElement("script"),
-		div = document.createElement("div"),
-		id = "script" + jQuery.now();
+	var div = document.createElement("div");
 
 	div.style.display = "none";
 	div.innerHTML = "   <link/><table></table><a href='/a' style='color:red;float:left;opacity:.55;'>a</a><input type='checkbox'/>";
@@ -61,9 +58,10 @@
 		optSelected: opt.selected,
 
 		// Will be defined later
+		deleteExpando: true,
 		optDisabled: false,
 		checkClone: false,
-		scriptEval: false,
+		_scriptEval: null,
 		noCloneEvent: true,
 		boxModel: null,
 		inlineBlockNeedsLayout: false,
@@ -76,23 +74,45 @@
 	select.disabled = true;
 	jQuery.support.optDisabled = !opt.disabled;
 
-	script.type = "text/javascript";
-	try {
-		script.appendChild( document.createTextNode( "window." + id + "=1;" ) );
-	} catch(e) {}
+	jQuery.support.scriptEval = function() {
+		if ( jQuery.support._scriptEval === null) {
+			var root = document.documentElement,
+				script = document.createElement("script"),
+				id = "script" + jQuery.now();
+
+			script.type = "text/javascript";
+			try {
+				script.appendChild( document.createTextNode( "window." + id + "=1;" ) );
+			} catch(e) {}
+
+			root.insertBefore( script, root.firstChild );
+
+			// Make sure that the execution of code works by injecting a script
+			// tag with appendChild/createTextNode
+			// (IE doesn't support this, fails, and uses .text instead)
+			if ( window[ id ] ) {
+				jQuery.support._scriptEval = true;
+				delete window[ id ];
+			} else {
+				jQuery.support._scriptEval = false;
+			}
+
+			root.removeChild( script );
+			// release memory in IE
+			root = script = id  = null;
+		}
+		return jQuery.support._scriptEval;
+	};
 
-	root.insertBefore( script, root.firstChild );
+	// Test to see if it's possible to delete an expando from an element
+	// Fails in Internet Explorer
+	try {
+		delete div.test;
 
-	// Make sure that the execution of code works by injecting a script
-	// tag with appendChild/createTextNode
-	// (IE doesn't support this, fails, and uses .text instead)
-	if ( window[ id ] ) {
-		jQuery.support.scriptEval = true;
-		delete window[ id ];
+	} catch(e) {
+		jQuery.support.deleteExpando = false;
 	}
 
-	root.removeChild( script );
-
 	if ( div.attachEvent && div.fireEvent ) {
 		div.attachEvent("onclick", function click() {
 			// Cloning a node shouldn't copy over any
@@ -121,24 +141,24 @@
 		document.body.appendChild( div );
 		jQuery.boxModel = jQuery.support.boxModel = div.offsetWidth === 2;
 
-		if ( 'zoom' in div.style ) {
+		if ( "zoom" in div.style ) {
 			// Check if natively block-level elements act like inline-block
 			// elements when setting their display to 'inline' and giving
 			// them layout
 			// (IE < 8 does this)
-			div.style.display = 'inline';
+			div.style.display = "inline";
 			div.style.zoom = 1;
 			jQuery.support.inlineBlockNeedsLayout = div.offsetWidth === 2;
 
 			// Check if elements with layout shrink-wrap their children
 			// (IE 6 does this)
-			div.style.display = '';
-			div.innerHTML = '<div style="width:4px;"></div>';
+			div.style.display = "";
+			div.innerHTML = "<div style='width:4px;'></div>";
 			jQuery.support.shrinkWrapBlocks = div.offsetWidth !== 2;
 		}
 
-		div.innerHTML = '<table><tr><td style="padding:0;display:none"></td><td>t</td></tr></table>';
-		var tds = div.getElementsByTagName('td');
+		div.innerHTML = "<table><tr><td style='padding:0;border:0;display:none'></td><td>t</td></tr></table>";
+		var tds = div.getElementsByTagName("td");
 
 		// Check if table cells still have offsetWidth/Height when they are set
 		// to display:none and there are still other visible table cells in a
@@ -149,15 +169,15 @@
 		// (only IE 8 fails this test)
 		jQuery.support.reliableHiddenOffsets = tds[0].offsetHeight === 0;
 
-		tds[0].style.display = '';
-		tds[1].style.display = 'none';
+		tds[0].style.display = "";
+		tds[1].style.display = "none";
 
 		// Check if empty table cells still have offsetWidth/Height
 		// (IE < 8 fail this test)
 		jQuery.support.reliableHiddenOffsets = jQuery.support.reliableHiddenOffsets && tds[0].offsetHeight === 0;
-		div.innerHTML = '';
+		div.innerHTML = "";
 
-		document.body.removeChild( div ).style.display = 'none';
+		document.body.removeChild( div ).style.display = "none";
 		div = tds = null;
 	});
 
@@ -181,20 +201,6 @@
 	jQuery.support.changeBubbles = eventSupported("change");
 
 	// release memory in IE
-	root = script = div = all = a = null;
+	div = all = a = null;
 })();
-
-jQuery.props = {
-	"for": "htmlFor",
-	"class": "className",
-	readonly: "readOnly",
-	maxlength: "maxLength",
-	cellspacing: "cellSpacing",
-	rowspan: "rowSpan",
-	colspan: "colSpan",
-	tabindex: "tabIndex",
-	usemap: "useMap",
-	frameborder: "frameBorder"
-};
-
 })( jQuery );