AJAX 自学练习 请求与显示
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2023-11-26 20:25:34
如下： request.jsp 复制代码 代码如下:<%@ page language="java" contenttype="text/html; charset=...
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");
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。
request.jsp
复制代码 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
复制代码 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。