treewalkerexample1.htm

来自「这是javascript高级程序设计的源码」· HTM 代码 · 共 43 行

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43 行
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<html>
    <head>
        <title>TreeWalker Example</title>
        <script type="text/javascript">

           var walker = null;

           function makeList() {
               var oDiv = document.getElementById("div1");
               var oFilter = new Object;
               oFilter.acceptNode = function (oNode) {
                   return (oNode.tagName == "P") ? 
                           NodeFilter.FILTER_REJECT : NodeFilter.FILTER_ACCEPT;
               };

               walker = document.createTreeWalker(oDiv, NodeFilter.SHOW_ELEMENT, oFilter, false);

               var oOutput = document.getElementById("text1");
               var oNode = walker.nextNode();
               while (oNode) {
                   oOutput.value += oNode.tagName + "\n";
                   oNode = walker.nextNode();
               }

           }

        </script>
    </head>
    <body>
        <p><strong>Note:</strong> The <code>TreeWalker</code> object has only been implemented in Opera (version 7.6 and higher), Safari (version 1.3 and higher), and Firefox (version 1.0 and higher). It has not been implemented in Internet Explorer (so this example won't work).</p>
        <div id="div1">
            <p>Hello <b>World!</b></p>
            <ul>
                <li>List item 1</li>
                <li>List item 2</li>
                <li>List item 3</li>
            </ul>
        </div>
        <textarea rows="10" cols="40" id="text1"></textarea><br />
        <input type="button" value="Make List" onclick="makeList()" />
    </body>
</html>

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