Insert title here

ajax读取数据库内容实现二级联动下拉选择菜单示例复制代码代码如下:

—————————————————————这是ajax（javascript）代码———————————————————————————

function send_request(callback, urladdress, isReturnData){ var xmlhttp = getXMLHttpRequest(); xmlhttp.onreadystatechange = function(){ if (xmlhttp.readyState == 4) {//readystate 为4即数据传输结束 try{ if(xmlhttp.status == 200){ if(isReturnData && isReturnData==true){ callback(xmlhttp.responseText); } }else{ callback("抱歉，没找到此页面:"+ urladdress +""); } } catch(e){ callback("抱歉，发送请求失败，请重试 " + 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");//设定以UTF-8编码识别数据 } 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; }

————————————————————————这是客户端表单jsp代码——————————————————————————————
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib uri="/struts-tags" prefix="s"%>Insert title here

————————————————————————这是服务端action代码——————————————————————————————

 
 
 这里是我的业务逻辑，每个逻辑不同，所以这段代码这只是为了把想要显示的内容放在request范围内，然后return到下一个页面.javabean中有我的MyProcess类和它的属性 
 
public String getProcessType(){ HttpServletRequest request=ServletActionContext.getRequest(); String value=request.getParameter("value"); List MyProcesses= processService.getProcessByType(value); for(MyProcess p:MyProcesses){ System.out.println(p.getName()); } request.setAttribute("list",MyProcesses); return SUCCESS; }
————————————————————————这是服务端jsp代码——————————————————————————————
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ include file="/page/share/taglib.jsp"%>     Insert title here     

 
 
 这个过程差不多就这些！