AJAX 自学练习 请求与显示
如下:
request.jsp
response.jsp
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。
request.jsp
代码如下:
<%@ 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
代码如下:
<%@ 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"); else out.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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