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                 opacity: a.style.opacity === "0.55",
  44
  45                 // Verify style float existence
  46                 // (IE uses styleFloat instead of cssFloat)
  47                 cssFloat: !!a.style.cssFloat,
  48
  49                 // Will be defined later
  50                 scriptEval: false,
  51                 noCloneEvent: true,
  52                 boxModel: null
  53         };
  54
  55         script.type = "text/javascript";
  56         try {
  57                 script.appendChild( document.createTextNode( "window." + id + "=1;" ) );
  58         } catch(e){}
  59
  60         root.insertBefore( script, root.firstChild );
  61
  62         // Make sure that the execution of code works by injecting a script
  63         // tag with appendChild/createTextNode
  64         // (IE doesn't support this, fails, and uses .text instead)
  65         if ( window[ id ] ) {
  66                 jQuery.support.scriptEval = true;
  67                 delete window[ id ];
  68         }
  69
  70         root.removeChild( script );
  71
  72         if ( div.attachEvent && div.fireEvent ) {
  73                 div.attachEvent("onclick", function click(){
  74                         // Cloning a node shouldn't copy over any
  75                         // bound event handlers (IE does this)
  76                         jQuery.support.noCloneEvent = false;
  77                         div.detachEvent("onclick", click);
  78                 });
  79                 div.cloneNode(true).fireEvent("onclick");
  80         }
  81
  82         // Figure out if the W3C box model works as expected
  83         // document.body must exist before we can do this
  84         // TODO: This timeout is temporary until I move ready into core.js.
  85         setTimeout(function(){
  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         }, 13);
  96
  97         // Technique from Juriy Zaytsev
  98         // http://thinkweb2.com/projects/prototype/detecting-event-support-without-browser-sniffing/
  99         var eventSupported = function( eventName ) {
 100                 var el = document.createElement("div");
 101                 eventName = "on" + eventName;
 102
 103                 var isSupported = (eventName in el);
 104                 if ( !isSupported ) {
 105                         el.setAttribute(eventName, "return;");
 106                         isSupported = typeof el[eventName] === "function";
 107                 }
 108                 el = null;
 109
 110                 return isSupported;
 111         };
 112
 113         jQuery.support.submitBubbles = eventSupported("submit");
 114         jQuery.support.changeBubbles = eventSupported("change");
 115         jQuery.support.focusBubbles = eventSupported("focus");
 116
 117         // release memory in IE
 118         root = script = div = all = a = null;
 119 })();
 120
 121 jQuery.props = {
 122         "for": "htmlFor",
 123         "class": "className",
 124         readonly: "readOnly",
 125         maxlength: "maxLength",
 126         cellspacing: "cellSpacing",
 127         rowspan: "rowSpan",
 128         colspan: "colSpan",
 129         tabindex: "tabIndex",
 130         usemap: "useMap",
 131         frameborder: "frameBorder"
 132 };