📄 9-9.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>自动校验的表单</title>
<style type="text/css">
<!--
form{
padding:0px; margin:0px;
font-size:12px;
font-family:Arial, Helvetica, sans-serif;
}
input{
border:1px solid #004082;
font-size:12px;
font-family:Arial, Helvetica, sans-serif;
}
-->
</style>
<script language="javascript">
var xmlHttp;
function createXMLHttpRequest(){
if(window.ActiveXObject)
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
else if(window.XMLHttpRequest)
xmlHttp = new XMLHttpRequest();
}
function showResult(sText){
var oSpan = document.getElementById("UserResult");
oSpan.innerHTML = sText;
if(sText.indexOf("already exists") >= 0)
//如果用户名已被占用
oSpan.style.color = "red";
else
oSpan.style.color = "black";
}
function startCheck(oInput){
//首先判断是否有输入，没有输入直接返回，并提示
if(!oInput.value){
oInput.focus(); //聚焦到用户名的输入框
document.getElementById("UserResult").innerHTML = "User cannot be empty.";
return;
}
//创建异步请求
createXMLHttpRequest();
var sUrl = "9-9.aspx?user=" + oInput.value.toLowerCase() + "×tamp=" + new Date().getTime();
xmlHttp.open("GET",sUrl,true);
xmlHttp.onreadystatechange = function(){
if(xmlHttp.readyState == 4 && xmlHttp.status == 200)
showResult(xmlHttp.responseText); //显示服务器结果
}
xmlHttp.send(null);
}
</script>
</head>
<body>
<form name="register">
<table cellpadding="5" cellspacing="0" border="0">
<tr><td>用户名:</td><td><input type="text" onblur="startCheck(this)" name="User"></td> <td><span id="UserResult"></span></td> </tr>
<tr><td>输入密码:</td><td><input type="password" name="passwd1"></td> <td></td> </tr>
<tr><td>确认密码:</td><td><input type="password" name="passwd2"></td> <td></td> </tr>
<tr>
<td colspan="2" align="center">
<input type="submit" value="注册">
<input type="reset" value="重置">
</td> <td></td>
</tr>
</table>
</form>
</body>
</html>⌨️ 快捷键说明
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