ASP.NET：多级下拉菜单的级连显示问题
日期：2011-01-08 浏览次数：20563 次
多级下拉菜单的级连显示问题。
在这里，我为了实现公司－部门级连显示问题，我编写了leader_add_competence_dialogquery.jsp ，web.xml，SelectCropDepartServlet.java 类。
其中注意的是leader_add_competence_dialogquery中的.jspChange_Select() javascript函数中的/selectCropDepart是在web.xml中定义的servlet类。我们在实现应用当中需要修改的用红字标出。
其中leader_add_competence_dialogquery.jsp代码如下：
<%@ page contentType="text/html; charset=gbk" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="pub.*" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>添加领导权限</title>
<link href="../css/putong.css" type="text/css" rel="stylesheet">
<base target="_self">
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache">
<META HTTP-EQUIV="Expires" CONTENT="0">
</head>
<script language="javascript">
var req;
window.onload=function(){
}
function Change_Select(){
var zhi = document.getElementById('Corp').value;
var url = "../selectCropDepart?id=" + escape(zhi);
//alert(url);
if (window.XMLHttpRequest) {
req = new XMLHttpRequest();
}else if (window.ActiveXObject) {
req = new ActiveXObject("Microsoft.XMLHTTP");
}
if(req){
req.open("GET", url, true);
req.onreadystatechange = callback;
req.send(null);
}
}
function callback() {
if (req.readyState == 4) {
if (req.status == 200) {
parseMessage();
// update the HTML DOM based on whether or not message is valid
}else{
alert ("Not able to retrieve description" +req.status+req.statusText);
}
}
}
function parseMessage() {
var xmlDoc = req.responseXML.documentElement;
var xSel = xmlDoc.getElementsByTagName('select');
var select_root = document.getElementById('Depart');
select_root.options.length=0;
for(var i=0;i<xSel.length;i++)
{
var xValue = xSel[i].childNodes[0].firstChild.nodeValue;
var xText = xSel[i].childNodes[1].firstChild.nodeValue;
var option = new Option(xText,xValue);
