mirror of
https://github.com/jquery/jquery.git
synced 2024-11-23 02:54:22 +00:00
237 lines
7.3 KiB
JavaScript
237 lines
7.3 KiB
JavaScript
(function( jQuery ) {
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jQuery.support = (function() {
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var div = document.createElement( "div" ),
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all,
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a,
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select,
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opt,
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input,
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marginDiv,
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support,
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fragment,
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body,
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bodyStyle,
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tds,
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events,
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eventName,
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i,
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isSupported;
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// Preliminary tests
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div.setAttribute("className", "t");
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div.innerHTML = " <link/><table></table><a href='/a' style='top:1px;float:left;opacity:.55;'>a</a><input type='checkbox'/>";
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all = div.getElementsByTagName( "*" );
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a = div.getElementsByTagName( "a" )[ 0 ];
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// Can't get basic test support
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if ( !all || !all.length || !a ) {
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return {};
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}
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// First batch of supports tests
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select = document.createElement( "select" );
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opt = select.appendChild( document.createElement("option") );
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input = div.getElementsByTagName( "input" )[ 0 ];
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support = {
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// IE strips leading whitespace when .innerHTML is used
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leadingWhitespace: ( div.firstChild.nodeType === 3 ),
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// Make sure that tbody elements aren't automatically inserted
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// IE will insert them into empty tables
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tbody: !div.getElementsByTagName( "tbody" ).length,
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// Make sure that link elements get serialized correctly by innerHTML
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// This requires a wrapper element in IE
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htmlSerialize: !!div.getElementsByTagName( "link" ).length,
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// Get the style information from getAttribute
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// (IE uses .cssText instead)
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style: /top/.test( a.getAttribute("style") ),
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// Make sure that URLs aren't manipulated
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// (IE normalizes it by default)
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hrefNormalized: ( a.getAttribute( "href" ) === "/a" ),
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// Make sure that element opacity exists
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// (IE uses filter instead)
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// Use a regex to work around a WebKit issue. See #5145
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opacity: /^0.55$/.test( a.style.opacity ),
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// Verify style float existence
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// (IE uses styleFloat instead of cssFloat)
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cssFloat: !!a.style.cssFloat,
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// Make sure that if no value is specified for a checkbox
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// that it defaults to "on".
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// (WebKit defaults to "" instead)
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checkOn: ( input.value === "on" ),
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// Make sure that a selected-by-default option has a working selected property.
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// (WebKit defaults to false instead of true, IE too, if it's in an optgroup)
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optSelected: opt.selected,
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// Test setAttribute on camelCase class. If it works, we need attrFixes when doing get/setAttribute (ie6/7)
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getSetAttribute: div.className !== "t",
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// Test for presence of native Function#bind.
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// Not in: >= Chrome 6, >= FireFox 3, Safari 5?, IE 9?, Opera 11?
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nativeBind: jQuery.isFunction( Function.prototype.bind ),
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// Will be defined later
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submitBubbles: true,
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changeBubbles: true,
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focusinBubbles: false,
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deleteExpando: true,
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noCloneEvent: true,
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inlineBlockNeedsLayout: false,
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shrinkWrapBlocks: false,
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reliableMarginRight: true
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};
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// Make sure checked status is properly cloned
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input.checked = true;
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support.noCloneChecked = input.cloneNode( true ).checked;
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// Make sure that the options inside disabled selects aren't marked as disabled
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// (WebKit marks them as disabled)
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select.disabled = true;
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support.optDisabled = !opt.disabled;
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// Test to see if it's possible to delete an expando from an element
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// Fails in Internet Explorer
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try {
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delete div.test;
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} catch( e ) {
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support.deleteExpando = false;
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}
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if ( !div.addEventListener && div.attachEvent && div.fireEvent ) {
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div.attachEvent( "onclick", function click() {
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// Cloning a node shouldn't copy over any
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// bound event handlers (IE does this)
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support.noCloneEvent = false;
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div.detachEvent( "onclick", click );
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});
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div.cloneNode( true ).fireEvent( "onclick" );
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}
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div.innerHTML = "<input type='radio' name='radiotest' checked='checked'/>";
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fragment = document.createDocumentFragment();
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fragment.appendChild( div.firstChild );
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// WebKit doesn't clone checked state correctly in fragments
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support.checkClone = fragment.cloneNode( true ).cloneNode( true ).lastChild.checked;
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div.innerHTML = "";
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// Figure out if the W3C box model works as expected
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div.style.width = div.style.paddingLeft = "1px";
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// We use our own, invisible, body
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body = document.createElement( "body" );
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bodyStyle = {
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visibility: "hidden",
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width: 0,
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height: 0,
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border: 0,
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margin: 0
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};
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for ( i in bodyStyle ) {
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body.style[ i ] = bodyStyle[ i ];
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}
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body.appendChild( div );
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document.documentElement.appendChild( body );
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support.boxModel = div.offsetWidth === 2;
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if ( "zoom" in div.style ) {
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// Check if natively block-level elements act like inline-block
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// elements when setting their display to 'inline' and giving
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// them layout
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// (IE < 8 does this)
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div.style.display = "inline";
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div.style.zoom = 1;
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support.inlineBlockNeedsLayout = ( div.offsetWidth === 2 );
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// Check if elements with layout shrink-wrap their children
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// (IE 6 does this)
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div.style.display = "";
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div.innerHTML = "<div style='width:4px;'></div>";
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support.shrinkWrapBlocks = ( div.offsetWidth !== 2 );
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}
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div.innerHTML = "<table><tr><td style='padding:0;border:0;display:none'></td><td>t</td></tr></table>";
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tds = div.getElementsByTagName( "td" );
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// Check if table cells still have offsetWidth/Height when they are set
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// to display:none and there are still other visible table cells in a
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// table row; if so, offsetWidth/Height are not reliable for use when
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// determining if an element has been hidden directly using
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// display:none (it is still safe to use offsets if a parent element is
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// hidden; don safety goggles and see bug #4512 for more information).
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// (only IE 8 fails this test)
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isSupported = ( tds[ 0 ].offsetHeight === 0 );
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tds[ 0 ].style.display = "";
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tds[ 1 ].style.display = "none";
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// Check if empty table cells still have offsetWidth/Height
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// (IE < 8 fail this test)
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support.reliableHiddenOffsets = isSupported && ( tds[ 0 ].offsetHeight === 0 );
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div.innerHTML = "";
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// Check if div with explicit width and no margin-right incorrectly
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// gets computed margin-right based on width of container. For more
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// info see bug #3333
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// Fails in WebKit before Feb 2011 nightlies
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// WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
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if ( document.defaultView && document.defaultView.getComputedStyle ) {
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marginDiv = document.createElement('div');
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marginDiv.style.width = "0";
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marginDiv.style.marginRight = "0";
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div.appendChild( marginDiv );
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support.reliableMarginRight =
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( parseInt( document.defaultView.getComputedStyle( marginDiv ).marginRight, 10 ) || 0 ) === 0;
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}
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// Remove the body element we added
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document.documentElement.removeChild( body );
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// Technique from Juriy Zaytsev
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// http://thinkweb2.com/projects/prototype/detecting-event-support-without-browser-sniffing/
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// We only care about the case where non-standard event systems
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// are used, namely in IE. Short-circuiting here helps us to
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// avoid an eval call (in setAttribute) which can cause CSP
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// to go haywire. See: https://developer.mozilla.org/en/Security/CSP
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if ( div.attachEvent ) {
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for( i in {
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submit: 1,
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change: 1,
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focusin: 1
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} ) {
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eventName = "on" + i;
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isSupported = ( eventName in div );
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if ( !isSupported ) {
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div.setAttribute( eventName, "return;" );
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isSupported = ( typeof div[ eventName ] === "function" );
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}
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support[ i + "Bubbles" ] = isSupported;
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}
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}
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// release memory in IE
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body = div = all = a = tds = undefined;
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return support;
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})();
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// Keep track of boxModel
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jQuery.boxModel = jQuery.support.boxModel;
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})( jQuery );
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