Moved unload abort code so that the event is only bound if the xhr transport is used...
[jquery.git] / src / support.js
index c9bfdf0..e4c3ea9 100644 (file)
@@ -1,3 +1,5 @@
+(function( jQuery ) {
+
 (function() {
 
        jQuery.support = {};
@@ -5,13 +7,15 @@
        var root = document.documentElement,
                script = document.createElement("script"),
                div = document.createElement("div"),
-               id = "script" + now();
+               id = "script" + jQuery.now();
 
        div.style.display = "none";
        div.innerHTML = "   <link/><table></table><a href='/a' style='color:red;float:left;opacity:.55;'>a</a><input type='checkbox'/>";
 
        var all = div.getElementsByTagName("*"),
-               a = div.getElementsByTagName("a")[0];
+               a = div.getElementsByTagName("a")[0],
+               select = document.createElement("select"),
+               opt = select.appendChild( document.createElement("option") );
 
        // Can't get basic test support
        if ( !all || !all.length || !a ) {
 
                // Make sure that a selected-by-default option has a working selected property.
                // (WebKit defaults to false instead of true, IE too, if it's in an optgroup)
-               optSelected: document.createElement("select").appendChild( document.createElement("option") ).selected,
-
-               parentNode: div.removeChild( div.appendChild( document.createElement("div") ) ).parentNode === null,
+               optSelected: opt.selected,
 
                // Will be defined later
                deleteExpando: true,
+               optDisabled: false,
                checkClone: false,
                scriptEval: false,
                noCloneEvent: true,
-               boxModel: null
+               boxModel: null,
+               inlineBlockNeedsLayout: false,
+               shrinkWrapBlocks: false,
+               reliableHiddenOffsets: true
        };
 
+       // Make sure that the options inside disabled selects aren't marked as disabled
+       // (WebKit marks them as diabled)
+       select.disabled = true;
+       jQuery.support.optDisabled = !opt.disabled;
+
        script.type = "text/javascript";
        try {
                script.appendChild( document.createTextNode( "window." + id + "=1;" ) );
                delete window[ id ];
        }
 
+       // Test to see if it's possible to delete an expando from an element
+       // Fails in Internet Explorer
+       try {
+               delete script.test;
+
+       } catch(e) {
+               jQuery.support.deleteExpando = false;
+       }
+
        root.removeChild( script );
 
        if ( div.attachEvent && div.fireEvent ) {
 
                document.body.appendChild( div );
                jQuery.boxModel = jQuery.support.boxModel = div.offsetWidth === 2;
-               document.body.removeChild( div ).style.display = 'none';
-
-               // Test to see if it's possible to delete an expando from an element
-               // Fails in Internet Explorer
-               try {
-                       div.test = 1;
-                       delete doc.test;
-       
-               } catch(e) {
-                       jQuery.support.deleteExpando = false;
+
+               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.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>";
+                       jQuery.support.shrinkWrapBlocks = div.offsetWidth !== 2;
                }
 
-               div = null;
+               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
+               // table row; if so, offsetWidth/Height are not reliable for use when
+               // determining if an element has been hidden directly using
+               // display:none (it is still safe to use offsets if a parent element is
+               // hidden; don safety goggles and see bug #4512 for more information).
+               // (only IE 8 fails this test)
+               jQuery.support.reliableHiddenOffsets = tds[0].offsetHeight === 0;
+
+               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 = "";
+
+               document.body.removeChild( div ).style.display = "none";
+               div = tds = null;
        });
 
        // Technique from Juriy Zaytsev
        // http://thinkweb2.com/projects/prototype/detecting-event-support-without-browser-sniffing/
-       var eventSupported = function( eventName ) { 
-               var el = document.createElement("div"); 
-               eventName = "on" + eventName; 
-
-               var isSupported = (eventName in el); 
-               if ( !isSupported ) { 
-                       el.setAttribute(eventName, "return;"); 
-                       isSupported = typeof el[eventName] === "function"; 
-               } 
-               el = null; 
-
-               return isSupported; 
+       var eventSupported = function( eventName ) {
+               var el = document.createElement("div");
+               eventName = "on" + eventName;
+
+               var isSupported = (eventName in el);
+               if ( !isSupported ) {
+                       el.setAttribute(eventName, "return;");
+                       isSupported = typeof el[eventName] === "function";
+               }
+               el = null;
+
+               return isSupported;
        };
-       
+
        jQuery.support.submitBubbles = eventSupported("submit");
        jQuery.support.changeBubbles = eventSupported("change");
 
        // release memory in IE
        root = script = 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 );