简单的Ajax表单验证

发布时间：2020-12-16 01:49:10 所属栏目：百科来源：网络整理

导读：新建JavaWeb项目，新建a.jsp %@ page language="java" import="java.util.*" pageEncoding="UTF-8"%%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%

新建JavaWeb项目，新建a.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'a.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
	<script type="text/javascript">
		var xmlHttp = false;
		try {
			xmlHttp = new ActiveObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				xmlHttp = new ActiveObject("Microsoft.XMLHTTP");
			} catch (e) {
				xmlHttp = false;
			}
		}
		if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
			xmlHttp = new XMLHttpRequest();
		}
		function callServer(){
			
			var city = document.getElementById("city").value;
			var url = "b.jsp?city="+city;
			xmlHttp.open("GET",url,true);
			xmlHttp.onreadystatechange = updatePage;
			xmlHttp.send(null);
		}
		
		function updatePage(){
			if(xmlHttp.readyState == 4){
				var response  = xmlHttp.responseText;
				document.getElementById("check").innerHTML = response;
			}
		}
	</script>
  </head>
  
  <body>
	城市：<input type="text" id="city" onblur="callServer();" />*<a style="color: red;" id="check"></a><br/>
	状态：<input type="text" id="state" onblur="" /><br/>
  </body>
</html>

新建b.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
	String city = request.getParameter("city");
	System.out.println(city);
	if (city == null || city.trim().equals("")) {
		out.print("城市名不能为空！");
	} else {
		out.print("OK!");
	}
%>

（编辑：李大同）

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