本文介绍了一个使用JavaScript处理XML文档的示例。该示例展示了如何通过浏览器加载XML文件，并根据用户选择显示所有州或仅北部地区的州。通过简单的HTML界面和JavaScript函数实现了这一功能。
在浏览器上会生成具有两个按钮的HTML页面。点击第一个按钮，将从服务器加载XML文档，然后在警告框中显示列于文档中的所有州。点击第二个按钮也会从服务器加载XML文档，不过只在警告框中显示北部地区的各个州。
ParseXML.htm完整代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Parsing XML Responses with the W3C DOM</title>
<script type="text/javascript">
var xmlHttp;
var requestType = "";
function createXMLHttpRequest() {
if (window.ActiveXObject) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else if (window.XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
}
}
function startRequest(requestedList) {
requestType = requestedList;
createXMLHttpRequest();
xmlHttp.onreadystatechange = handleStateChange;
xmlHttp.open("GET", "parseXML.xml", true);
xmlHttp.send(null);
}
function handleStateChange() {
if(xmlHttp.readyState == 4) {
if(xmlHttp.status == 200) {
if(requestType == "north") {
listNorthStates();
}
else if(requestType == "all") {
listAllStates();
}
}
}
}
function listNorthStates() {
var xmlDoc = xmlHttp.responseXML;
var northNode = xmlDoc.getElementsByTagName("north")[0];
var out = "Northern States";
var northStates = northNode.getElementsByTagName("state");
outputList("Northern States", northStates);
}
function listAllStates() {
var xmlDoc = xmlHttp.responseXML;
var allStates = xmlDoc.getElementsByTagName("state");
outputList("All States in Document", allStates);
}
function outputList(title, states) {
var out = title;
var currentState = null;
for(var i = 0; i < states.length; i++) {
currentState = states[i];
out = out + "/n- " + currentState.childNodes[0].nodeValue;
}
alert(out);
}
</script>
</head>
<body>
<h1>Process XML Document of U.S. States</h1>
<br/><br/>
<form action="#">
<input type="button" value="View All Listed States" onclick="startRequest('all');"/>
<br/><br/>
<input type="button" value="View All Listed Northern States" onclick="startRequest('north');"/>
</form>
</body>
</html>
ParseXML.xml内容：
<?xml version="1.0" encoding="UTF-8"?>
<states>
<north>
<state>Minnesota</state>
<state>Iowa</state>
<state>North Dakota</state>
</north>
<south>
<state>Texas</state>
<state>Oklahoma</state>
<state>Louisiana</state>
</south>
<east>
<state>New York</state>
<state>North Carolina</state>
<state>Massachusetts</state>
</east>
<west>
<state>California</state>
<state>Oregon</state>
<state>Nevada</state>
</west>
</states>
ParseXML.htm完整代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head> <title>Parsing XML Responses with the W3C DOM</title><script type="text/javascript">var xmlHttp;var requestType = "";function createXMLHttpRequest() { if (window.ActiveXObject) { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } else if (window.XMLHttpRequest) { xmlHttp = new XMLHttpRequest(); }} function startRequest(requestedList) { requestType = requestedList; createXMLHttpRequest(); xmlHttp.onreadystatechange = handleStateChange; xmlHttp.open("GET", "parseXML.xml", true); xmlHttp.send(null);} function handleStateChange() { if(xmlHttp.readyState == 4) { if(xmlHttp.status == 200) { if(requestType == "north") { listNorthStates(); } else if(requestType == "all") { listAllStates(); } } }} function listNorthStates() { var xmlDoc = xmlHttp.responseXML; var northNode = xmlDoc.getElementsByTagName("north")[0]; var out = "Northern States"; var northStates = northNode.getElementsByTagName("state"); outputList("Northern States", northStates);}function listAllStates() { var xmlDoc = xmlHttp.responseXML; var allStates = xmlDoc.getElementsByTagName("state"); outputList("All States in Document", allStates);}function outputList(title, states) { var out = title; var currentState = null; for(var i = 0; i < states.length; i++) { currentState = states[i]; out = out + "/n- " + currentState.childNodes[0].nodeValue; } alert(out);}</script></head><body> <h1>Process XML Document of U.S. States</h1> <br/><br/> <form action="#"> <input type="button" value="View All Listed States" onclick="startRequest('all');"/> <br/><br/> <input type="button" value="View All Listed Northern States" onclick="startRequest('north');"/> </form></body></html>ParseXML.xml内容：
<?xml version="1.0" encoding="UTF-8"?><states> <north> <state>Minnesota</state> <state>Iowa</state> <state>North Dakota</state> </north> <south> <state>Texas</state> <state>Oklahoma</state> <state>Louisiana</state> </south> <east> <state>New York</state> <state>North Carolina</state> <state>Massachusetts</state> </east> <west> <state>California</state> <state>Oregon</state> <state>Nevada</state> </west></states>
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