<script type="text/javascript">
var req;
var target;
//初始化
function initRequest()
{
if (window.XMLHttpRequest) {
req = new XMLHttpRequest();
} else if (window.ActiveXObject) {
req = new ActiveXObject("Microsoft.XMLHTTP");
}
}
function getCharacterCount() {
//未实例化时,下次调用时不再实例化对象。
if (!target) target = document.getElementById("myinputid");
//这里注意的是:escape的使用
var url = "validate?id=" + escape(target.value);
initRequest();
req.onreadystatechange = processRequest;
req.open("GET", url, true);
req.send(null);
}
function processRequest() {
if (req.readyState == 4) {
if (req.status == 200) {
var message = req.responseXML.getElementsByTagName("number")[0].childNodes[0].nodeValue;
setMessageUsingDOM(message);
}
}
}
function setMessageUsingDOM(message) {
var userMessageElement = document.getElementById("myInputIdMessage");
var messageText;
userMessageElement.style.color = "green";
messageText = message + " characters are typed!";
var messageBody = document.createTextNode(messageText);
if (userMessageElement.childNodes[0]) {
userMessageElement.replaceChild(messageBody, userMessageElement.childNodes[0]);
} else {
userMessageElement.appendChild(messageBody);
}
}
</script>
<td><b>Enter something</b></td>
<td>
<input type="text" size="20" id="myinputid" name="myinputfield" onkeyup="getCharacterCount()">
</td>
<td>
<div id="myInputIdMessage"></div>
</td>
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