src/support.js

   1 (function() {
   2
   3         jQuery.support = {};
   4
   5         var root = document.documentElement,
   6                 script = document.createElement("script"),
   7                 div = document.createElement("div"),
   8                 id = "script" + now();
   9
  10         div.style.display = "none";
  11         div.innerHTML = '   <link/><table></table><a href="/a" style="color:red;float:left;opacity:.55;">a</a><select><option>text</option></select>';
  12
  13         var all = div.getElementsByTagName("*"),
  14                 a = div.getElementsByTagName("a")[0];
  15
  16         // Can't get basic test support
  17         if ( !all || !all.length || !a ) {
  18                 return;
  19         }
  20
  21         jQuery.support = {
  22                 // IE strips leading whitespace when .innerHTML is used
  23                 leadingWhitespace: div.firstChild.nodeType === 3,
  24
  25                 // Make sure that tbody elements aren't automatically inserted
  26                 // IE will insert them into empty tables
  27                 tbody: !div.getElementsByTagName("tbody").length,
  28
  29                 // Make sure that link elements get serialized correctly by innerHTML
  30                 // This requires a wrapper element in IE
  31                 htmlSerialize: !!div.getElementsByTagName("link").length,
  32
  33                 // Get the style information from getAttribute
  34                 // (IE uses .cssText insted)
  35                 style: /red/.test( a.getAttribute("style") ),
  36
  37                 // Make sure that URLs aren't manipulated
  38                 // (IE normalizes it by default)
  39                 hrefNormalized: a.getAttribute("href") === "/a",
  40
  41                 // Make sure that element opacity exists
  42                 // (IE uses filter instead)
  43                 // Use a regex to work around a WebKit issue. See #5145
  44                 opacity: /^0.55$/.test( a.style.opacity ),
  45
  46                 // Verify style float existence
  47                 // (IE uses styleFloat instead of cssFloat)
  48                 cssFloat: !!a.style.cssFloat,
  49
  50                 // Will be defined later
  51                 scriptEval: false,
  52                 noCloneEvent: true,
  53                 boxModel: null
  54         };
  55
  56         script.type = "text/javascript";
  57         try {
  58                 script.appendChild( document.createTextNode( "window." + id + "=1;" ) );
  59         } catch(e) {}
  60
  61         root.insertBefore( script, root.firstChild );
  62
  63         // Make sure that the execution of code works by injecting a script
  64         // tag with appendChild/createTextNode
  65         // (IE doesn't support this, fails, and uses .text instead)
  66         if ( window[ id ] ) {
  67                 jQuery.support.scriptEval = true;
  68                 delete window[ id ];
  69         }
  70
  71         root.removeChild( script );
  72
  73         if ( div.attachEvent && div.fireEvent ) {
  74                 div.attachEvent("onclick", function click() {
  75                         // Cloning a node shouldn't copy over any
  76                         // bound event handlers (IE does this)
  77                         jQuery.support.noCloneEvent = false;
  78                         div.detachEvent("onclick", click);
  79                 });
  80                 div.cloneNode(true).fireEvent("onclick");
  81         }
  82
  83         // Figure out if the W3C box model works as expected
  84         // document.body must exist before we can do this
  85         // TODO: This timeout is temporary until I move ready into core.js.
  86         jQuery(function() {
  87                 var div = document.createElement("div");
  88                 div.style.width = div.style.paddingLeft = "1px";
  89
  90                 document.body.appendChild( div );
  91                 jQuery.boxModel = jQuery.support.boxModel = div.offsetWidth === 2;
  92                 document.body.removeChild( div ).style.display = 'none';
  93                 div = null;
  94         });
  95
  96         // Technique from Juriy Zaytsev
  97         // http://thinkweb2.com/projects/prototype/detecting-event-support-without-browser-sniffing/
  98         var eventSupported = function( eventName ) {
  99                 var el = document.createElement("div");
 100                 eventName = "on" + eventName;
 101
 102                 var isSupported = (eventName in el);
 103                 if ( !isSupported ) {
 104                         el.setAttribute(eventName, "return;");
 105                         isSupported = typeof el[eventName] === "function";
 106                 }
 107                 el = null;
 108
 109                 return isSupported;
 110         };
 111
 112         jQuery.support.submitBubbles = eventSupported("submit");
 113         jQuery.support.changeBubbles = eventSupported("change");
 114
 115         // release memory in IE
 116         root = script = div = all = a = null;
 117 })();
 118
 119 jQuery.props = {
 120         "for": "htmlFor",
 121         "class": "className",
 122         readonly: "readOnly",
 123         maxlength: "maxLength",
 124         cellspacing: "cellSpacing",
 125         rowspan: "rowSpan",
 126         colspan: "colSpan",
 127         tabindex: "tabIndex",
 128         usemap: "useMap",
 129         frameborder: "frameBorder"
 130 };