AJAX 自学练习 请求与显示
主要功能输入 城市代码触发发送请求最终返回城市名称。如下:request.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title><script language="javascript"><!--function GetXmlHttpObject(){var xmlHttp = null;try{xmlHttp = new XMLHttpRequest();}catch(e){try{xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");}catch(e){xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");}}return xmlHttp;}function showMsg(str){xmlHttp = GetXmlHttpObject();if(xmlHttp == null){alert ("you browser don't support the ajax");return;}var url = "response.jsp";url = url + "?q="+ str;url = url + "&sid ="+ Math.random();xmlHttp.onreadystatechange = stateChanged;xmlHttp.open("GET", url, true);xmlHttp.send(null);}function stateChanged(){if(xmlHttp.readyState==4){document.getElementById("city").value = xmlHttp.responseText;}}// --></script></head><body><form name="form1" action="" method="post"><label >City Code:</label><input type="text" name="code" onblur = "showMsg(this.value)" /><br></br><label>City Name:</label><input type="text" name="city" id="city" ></input></form></body></html>
response.jsp
<%@ page language="java" contentType="text/plain; charset=UTF-8"pageEncoding="UTF-8"%><%@ page import="com.lwf.eus.util.*,java.util.*,com.lwf.eus.entity.*,com.lwf.eus.bean.*" %><%String code = request.getParameter("q");System.out.println(code);if(code.equals("140"))out.print("上海");else if(code.equals("150"))out.print("北京");else if(code.equals("160"))out.print("天津");elseout.print("未知地");%>
这里要注意的是由于返回的结果要在文本框中显示,因此在response.jsp中没有<html>等标签,因为测试发现如果有这些标签的话,在cityname文本框中这些标签也会显示。
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