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<%@ page contentType="text/plain;charset=utf-8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>BookInfo.htm</title>
<script language="JavaScript">
var xmlHttp;
function createXMLHttpRequest() {
if (window.XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
} else {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
}
//获取数据的调用函数
function Query() {
var value = myform.users.value;
alert(value);
createXMLHttpRequest();
xmlHttp.onreadystatechange = getData;
xmlHttp.open("GET","SearchBook.jsp?value="+value,true);
xmlHttp.send(null);
}
//回调函数
function getData() {
if(xmlHttp.readyState == 4 && xmlHttp.status==200) {
document.getElementById('bookinfo').innerHTML = xmlHttp.responseText;
}
}
</script>
</head>
<body>
<h1>实验三下拉菜单示例</h1>
<form action="myform">
选择图书编号:
<select name="users" onchange="Query()">
<option value="1"> 1程序设计 </option>
<option value="2"> 2网络维护 </option>
<option value="3"> 3多媒体设计 </option>
</select>
</form>
<div id="bookinfo"> </div>
</body>
</html>
<%@ page contentType="text/plain;charset=UTF-8"%>
<%@ page language="java"%>
<%
out.clear();//清空当前的输出内容(空格和换行符)
String valueStr = request.getParameter("value");
String bookinfo = null;//用于保存详细信息
if (valueStr != null) {
if("1".equals(valueStr)) {
bookinfo = "bookinfo详细信息1:我是xxxxx!!!!!!!";
} else if("2".equals(valueStr)) {
bookinfo = "bookinfo详细信息2:欢迎进入我的空间!!!!";
} else {
bookinfo = "bookinfo详细信息3:成功感言!!!!!!!!";
}
}
//根据是否包含正确内容决定输出的信息
if (null != bookinfo) {
out.println(bookinfo);
} else {
out.println("无法或者book详细信息");
}
%>
function Query(value) {
var value = myform.users.value;
alert(value);
createXMLHttpRequest();
xmlHttp.onreadystatechange = getData;
xmlHttp.open("GET","SearchBook.jsp?value="+value,true);
xmlHttp.send(null);
}
<select name="users" onchange="Query(this.value)">
就可以得到值了