X-Git-Url: http://git.asbjorn.biz/?p=jquery.git;a=blobdiff_plain;f=src%2Fsupport.js;h=4807ce27eb23c3ca3aca36a9c5612a6f3fbb6c44;hp=878db1f0ba401d1986b8dbbc0c705fafb66c50ac;hb=9d306bd73bb47562cd52f0fc4cc158c534cfdfdf;hpb=0cdcef5b364fa3c89d7f27935e77b453f4a56efd diff --git a/src/support.js b/src/support.js index 878db1f..4807ce2 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 = "
a"; @@ -61,12 +58,14 @@ optSelected: opt.selected, // Will be defined later + deleteExpando: true, optDisabled: false, checkClone: false, - scriptEval: false, + _scriptEval: null, noCloneEvent: true, boxModel: null, inlineBlockNeedsLayout: false, + shrinkWrapBlocks: false, reliableHiddenOffsets: true }; @@ -75,23 +74,46 @@ 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 @@ -114,23 +136,37 @@ // Figure out if the W3C box model works as expected // document.body must exist before we can do this jQuery(function() { - var div = document.createElement("div"); - div.style.width = div.style.paddingLeft = "1px"; + var div = document.createElement("div"), + body = document.getElementsByTagName("body")[0]; - document.body.appendChild( div ); - jQuery.boxModel = jQuery.support.boxModel = div.offsetWidth === 2; + // Frameset documents with no body should not run this code + if ( !body ) { + return; + } - // Check if natively block-level elements act like inline-block - // elements when setting their display to 'inline' - // (IE < 8 does this) - if ( 'zoom' in div.style ) { - div.style.display = 'inline'; + div.style.width = div.style.paddingLeft = "1px"; + body.appendChild( div ); + jQuery.boxModel = jQuery.support.boxModel = div.offsetWidth === 2; - // Layout is necessary to trigger this “feature” + 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 = "
"; + jQuery.support.shrinkWrapBlocks = div.offsetWidth !== 2; } + div.innerHTML = "
t
"; + 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 @@ -138,48 +174,48 @@ // 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) - div.innerHTML = '
t
'; - jQuery.support.reliableHiddenOffsets = div.getElementsByTagName('td')[0].offsetHeight === 0; - div.innerHTML = ''; + jQuery.support.reliableHiddenOffsets = tds[0].offsetHeight === 0; + + tds[0].style.display = ""; + tds[1].style.display = "none"; - document.body.removeChild( div ).style.display = 'none'; - div = null; + // 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 = ""; + + 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; + + // We only care about the case where non-standard event systems + // are used, namely in IE. Short-circuiting here helps us to + // avoid an eval call (in setAttribute) which can cause CSP + // to go haywire. See: https://developer.mozilla.org/en/Security/CSP + if ( !el.attachEvent ) { + return true; + } + + 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; + 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 );