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使用W3C DOM方法和JavaScript動態建立搜尋結果

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代碼清單3-5  dynamicContent.xml

<?xml version="1.0" encoding="UTF-8"?>

<properties>

    <property>

        <address>812 Gwyn Ave</address>

        <price>$100,000</price>

        <comments>Quiet, serene neighborhood</comments>

    </property>

    <property>

        <address>3308 James Ave S</address>

        <price>$110,000</price>

        <comments>Close to schools, shopping, entertainment</comments>

    </property>

    <property>

        <address>98320 County Rd 113</address>

        <price>$115,000</price>

        <comments>Small acreage outside of town</comments>

    </property>

</properties>

代碼清單3-6  dynamicContent.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"

  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<title>Dynamically Editing Page Content</title>

 

<script type="text/javascript">

var xmlHttp;

 

function createXMLHttpRequest() {

    if (window.ActiveXObject) {

        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");

    }

    else if (window.XMLHttpRequest) {

        xmlHttp = new XMLHttpRequest();

    }

}

 

function doSearch() {

    createXMLHttpRequest();

    xmlHttp.onreadystatechange = handleStateChange;

    xmlHttp.open("GET", "dynamicContent.xml", true);

    xmlHttp.send(null);

}

 

function handleStateChange() {

    if(xmlHttp.readyState == 4) {

        if(xmlHttp.status == 200) {

            clearPreviousResults();

            parseResults();

        }

    }

}

 

function clearPreviousResults() {

    var header = document.getElementById("header");

    if(header.hasChildNodes()) {

        header.removeChild(header.childNodes[0]);

    }

 

    var tableBody = document.getElementById("resultsBody");

    while(tableBody.childNodes.length > 0) {

        tableBody.removeChild(tableBody.childNodes[0]);

    }

}

 

function parseResults() {

    var results = xmlHttp.responseXML;

 

    var property = null;

    var address = "";

    var price = "";

    var comments = "";

 

    var properties = results.getElementsByTagName("property");

    for(var i = 0; i < properties.length; i++) {

        property = properties[i];

        address = property.getElementsByTagName("address")[0].firstChild.nodeValue;

        price = property.getElementsByTagName("price")[0].firstChild.nodeValue;

        comments = property.getElementsByTagName("comments")[0]

                                                                  .firstChild.nodeValue;

        addTableRow(address, price, comments);

    }

    var header = document.createElement("h2");

    var headerText = document.createTextNode("Results:");

    header.appendChild(headerText);

    document.getElementById("header").appendChild(header);

 

    document.getElementById("resultsTable").setAttribute("border", "1");

}

 

function addTableRow(address, price, comments) {

    var row = document.createElement("tr");

    var cell = createCellWithText(address);

    row.appendChild(cell);

 

    cell = createCellWithText(price);

    row.appendChild(cell);

 

    cell = createCellWithText(comments);

    row.appendChild(cell);

 

    document.getElementById("resultsBody").appendChild(row);

}

 

function createCellWithText(text) {

    var cell = document.createElement("td");

    var textNode = document.createTextNode(text);

    cell.appendChild(textNode);

 

    return cell;

}

</script>

</head>

 

<body>

  <h1>Search Real Estate Listings</h1>

 

  <form action="#">

    Show listings from

        <select>

            <option value="50000">$50,000</option>

            <option value="100000">$100,000</option>

            <option value="150000">$150,000</option>

        </select>

        to

        <select>

            <option value="100000">$100,000</option>

            <option value="150000">$150,000</option>

            <option value="200000">$200,000</option>

        </select>

    <input type="button" value="Search" onclick="doSearch();"/>

  </form>

 <span id="header">

 

  </span>

 

  <table id="resultsTable" width="75%" border="0">

    <tbody id="resultsBody">

    </tbody>

  </table>

</body>

</html>

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