overview-summary-sarissa_ieemu_xpath.js.html

sarissa用于支持多浏览器的浏览及编程

    * (moz will rezolve non-default namespaces by itself). You will need to map that
    * namespace to a prefix for queries to work.</p>
    * <p><b>Note 2 </b>: This method calls IE's setProperty method to set the
    * appropriate namespace-prefix mappings, so you dont have to do that.</p>
    * <span class="attrib">@param</span> oDoc The target XMLDocument to set the namespace mappings for.
    * <span class="attrib">@param</span> sNsSet A whilespace-seperated list of namespace declarations as
    *            those would appear in an XML document. E.g.:
    *            &lt;code&gt;&amp;quot;xmlns:xhtml=&amp;apos;http://www.w3.org/1999/xhtml&amp;apos;
    * xmlns:&amp;apos;http://www.w3.org/1999/XSL/Transform&amp;apos;&amp;quot;&lt;/code&gt;
    * <span class="attrib">@throws</span> An error if the format of the given namespace declarations is bad.
    */</span>
    Sarissa.setXpathNamespaces = <span class="reserved">function</span>(oDoc, sNsSet) {
        <span class="comment">//oDoc._sarissa_setXpathNamespaces(sNsSet);</span>
        oDoc._sarissa_useCustomResolver = true;
        var namespaces = sNsSet.indexOf(<span class="literal">" "</span>)&gt;-1?sNsSet.split(<span class="literal">" "</span>):new Array(sNsSet);
        oDoc._sarissa_xpathNamespaces = new Array(namespaces.length);
        <span class="reserved">for</span>(var i=0;i &lt; namespaces.length;i++){
            var ns = namespaces[i];
            var colonPos = ns.indexOf(<span class="literal">":"</span>);
            var assignPos = ns.indexOf(<span class="literal">"="</span>);
            <span class="reserved">if</span>(colonPos &gt; 0 &amp;&amp; assignPos &gt; colonPos+1){
                var prefix = ns.substring(colonPos+1, assignPos);
                var uri = ns.substring(assignPos+2, ns.length-1);
                oDoc._sarissa_xpathNamespaces[prefix] = uri;
            }<span class="reserved">else</span>{
                throw <span class="literal">"Bad format on namespace declaration(s) given"</span>;
            };
        };
    };
    <span class="comment">/**
    * <span class="attrib">@private</span> Flag to control whether a custom namespace resolver should
    *          be used, set to true by Sarissa.setXpathNamespaces
    */</span>
    XMLDocument.<span class="reserved">prototype</span>._sarissa_useCustomResolver = false;
    <span class="comment">/** <span class="attrib">@private</span> */</span>
    XMLDocument.<span class="reserved">prototype</span>._sarissa_xpathNamespaces = new Array();
    <span class="comment">/**
    * &lt;p&gt;Extends the XMLDocument to emulate IE's selectNodes.&lt;/p&gt;
    * <span class="attrib">@argument</span> sExpr the XPath expression to use
    * <span class="attrib">@argument</span> contextNode this is for internal use only by the same
    *           method when called on Elements
    * <span class="attrib">@returns</span> the result of the XPath search as a SarissaNodeList
    * <span class="attrib">@throws</span> An error if no namespace URI is found for the given prefix.
    */</span>
    XMLDocument.<span class="reserved">prototype</span>.selectNodes = <span class="reserved">function</span>(sExpr, contextNode, returnSingle){
        var nsDoc = <span class="reserved">this</span>;
        var nsresolver = <span class="reserved">this</span>._sarissa_useCustomResolver
        ? <span class="reserved">function</span>(prefix){
            var s = nsDoc._sarissa_xpathNamespaces[prefix];
            <span class="reserved">if</span>(s)<span class="reserved">return</span> s;
            <span class="reserved">else</span> throw <span class="literal">"No namespace URI found for prefix: '"</span> + prefix+<span class="literal">"'"</span>;
            }
        : <span class="reserved">this</span>.createNSResolver(<span class="reserved">this</span>.documentElement);
        var result = null;
        <span class="reserved">if</span>(!returnSingle){
            var oResult = <span class="reserved">this</span>.evaluate(sExpr,
                (contextNode?contextNode:<span class="reserved">this</span>),
                nsresolver,
                XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
            var nodeList = new SarissaNodeList(oResult.snapshotLength);
            nodeList.expr = sExpr;
            <span class="reserved">for</span>(var i=0;i&lt;nodeList.length;i++)
                nodeList[i] = oResult.snapshotItem(i);
            result = nodeList;
        }
        <span class="reserved">else</span> {
            result = oResult = <span class="reserved">this</span>.evaluate(sExpr,
                (contextNode?contextNode:<span class="reserved">this</span>),
                nsresolver,
                XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
        };
        <span class="reserved">return</span> result;      
    };
    <span class="comment">/**
    * &lt;p&gt;Extends the Element to emulate IE's selectNodes&lt;/p&gt;
    * <span class="attrib">@argument</span> sExpr the XPath expression to use
    * <span class="attrib">@returns</span> the result of the XPath search as an (Sarissa)NodeList
    * <span class="attrib">@throws</span> An
    *             error if invoked on an HTML Element as this is only be
    *             available to XML Elements.
    */</span>
    Element.<span class="reserved">prototype</span>.selectNodes = <span class="reserved">function</span>(sExpr){
        var doc = <span class="reserved">this</span>.ownerDocument;
        <span class="reserved">if</span>(doc.selectNodes)
            <span class="reserved">return</span> doc.selectNodes(sExpr, <span class="reserved">this</span>);
        <span class="reserved">else</span>
            throw <span class="literal">"Method selectNodes is only supported by XML Elements"</span>;
    };
    <span class="comment">/**
    * &lt;p&gt;Extends the XMLDocument to emulate IE's selectSingleNode.&lt;/p&gt;
    * <span class="attrib">@argument</span> sExpr the XPath expression to use
    * <span class="attrib">@argument</span> contextNode this is for internal use only by the same
    *           method when called on Elements
    * <span class="attrib">@returns</span> the result of the XPath search as an (Sarissa)NodeList
    */</span>
    XMLDocument.<span class="reserved">prototype</span>.selectSingleNode = <span class="reserved">function</span>(sExpr, contextNode){
        var ctx = contextNode?contextNode:null;
        <span class="reserved">return</span> <span class="reserved">this</span>.selectNodes(sExpr, ctx, true);
    };
    <span class="comment">/**
    * &lt;p&gt;Extends the Element to emulate IE's selectSingleNode.&lt;/p&gt;
    * <span class="attrib">@argument</span> sExpr the XPath expression to use
    * <span class="attrib">@returns</span> the result of the XPath search as an (Sarissa)NodeList
    * <span class="attrib">@throws</span> An error if invoked on an HTML Element as this is only be
    *             available to XML Elements.
    */</span>
    Element.<span class="reserved">prototype</span>.selectSingleNode = <span class="reserved">function</span>(sExpr){
        var doc = <span class="reserved">this</span>.ownerDocument;
        <span class="reserved">if</span>(doc.selectSingleNode)
            <span class="reserved">return</span> doc.selectSingleNode(sExpr, <span class="reserved">this</span>);
        <span class="reserved">else</span>
            throw <span class="literal">"Method selectNodes is only supported by XML Elements"</span>;
    };
    Sarissa.IS_ENABLED_SELECT_NODES = true;
};
</pre>
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<div class="jsdoc_ctime">Documentation generated by <a href="http://jsdoc.sourceforge.net/" target="_parent">JSDoc</a> on Thu Nov 30 22:06:11 2006</div>
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