ajax讀取數據庫內容實現二級聯動下拉選擇菜單示例
2024-09-01 08:29:01
供稿：網友
代碼如下:
<PRE class=javascript name="code"></PRE><PRE class=javascript name="code">—————————————————————這是ajax（javascript）代碼———————————————————————————</PRE><PRE class=javascript name="code"></PRE><PRE class=javascript name="code">function send_request(callback, urladdress, isReturnData){
var xmlhttp = getXMLHttpRequest();
xmlhttp.onreadystatechange = function(){
if (xmlhttp.readyState == 4) {//readystate 為4即數據傳輸結束
try{
if(xmlhttp.status == 200){
if(isReturnData && isReturnData==true){
callback(xmlhttp.responseText);
}
}else{
callback("抱歉，沒找到此頁面:"+ urladdress +"");
}
} catch(e){
callback("抱歉，發送請求失敗，請重試 " + e);
}
}
}
xmlhttp.open("POST", urladdress, true);
xmlhttp.send(null);
}
function getXMLHttpRequest() {
var xmlhttp;
if (window.XMLHttpRequest) {
try {
xmlhttp = new XMLHttpRequest();
xmlhttp.overrideMimeType("text/html;charset=UTF-8");//設定以UTF-8編碼識別數據
} catch (e) {}
} else if (window.ActiveXObject) {
try {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {
try {
xmlhttp = new ActiveXObject("Msxml2.XMLHttp");
} catch (e) {
try {
xmlhttp = new ActiveXObject("Msxml3.XMLHttp");
} catch (e) {}
}
}
}
return xmlhttp;
}
</PRE>————————————————————————這是客戶端表單jsp代碼——————————————————————————————<BR>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib uri="/struts-tags" prefix="s"%><!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 type="text/javascript" src="<%=request.getContextPath()%>/js/xmlhttp.js"></script><script type="text/javascript">function getProcess(value) {var process = document.getElementById('process');send_request(function(value2)
{process.innerHTML = value2;}, "getProcessType.action?value="+value, true);}</script></head><body><div><form action="" method="post" name="form"><select name="process" onchange="getProcess(this.value)"><option value="0" selected>請選擇流程種類</option><option value="Y">業務流程</option><option
value="G">管理流程</option><option value="Z">支持流程</option></select><div id="process"><select name="smallclass"><option value="一級流程名稱" selected>請選擇一級流程名稱</OPTION></select></div><input type="submit" value="提交"></form></div></body></html>
