X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=src%2Fsupport.js;h=4807ce27eb23c3ca3aca36a9c5612a6f3fbb6c44;hb=08fcde6a59e5bb6ca9e58bf78aac64ff2c15c29d;hp=e4c3ea9164c6e8e41efa542499c351d97470670c;hpb=52b1709b94cf631e0641eebfa4f76b101528d93b;p=jquery.git
diff --git a/src/support.js b/src/support.js
index e4c3ea9..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";
@@ -64,7 +61,7 @@
deleteExpando: true,
optDisabled: false,
checkClone: false,
- scriptEval: false,
+ _scriptEval: null,
noCloneEvent: true,
boxModel: null,
inlineBlockNeedsLayout: false,
@@ -77,32 +74,46 @@
select.disabled = true;
jQuery.support.optDisabled = !opt.disabled;
- script.type = "text/javascript";
- try {
- script.appendChild( document.createTextNode( "window." + id + "=1;" ) );
- } catch(e) {}
-
- root.insertBefore( script, root.firstChild );
+ 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;
+ }
- // 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 ];
- }
+ return jQuery.support._scriptEval;
+ };
// Test to see if it's possible to delete an expando from an element
// Fails in Internet Explorer
try {
- delete script.test;
+ delete div.test;
} 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
@@ -125,10 +136,16 @@
// 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];
+
+ // Frameset documents with no body should not run this code
+ if ( !body ) {
+ return;
+ }
- document.body.appendChild( div );
+ div.style.width = div.style.paddingLeft = "1px";
+ body.appendChild( div );
jQuery.boxModel = jQuery.support.boxModel = div.offsetWidth === 2;
if ( "zoom" in div.style ) {
@@ -167,7 +184,7 @@
jQuery.support.reliableHiddenOffsets = jQuery.support.reliableHiddenOffsets && tds[0].offsetHeight === 0;
div.innerHTML = "";
- document.body.removeChild( div ).style.display = "none";
+ body.removeChild( div ).style.display = "none";
div = tds = null;
});
@@ -177,6 +194,14 @@
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;");
@@ -191,6 +216,6 @@
jQuery.support.changeBubbles = eventSupported("change");
// release memory in IE
- root = script = div = all = a = null;
+ div = all = a = null;
})();
})( jQuery );