Ajax实现二级或者三级联动下拉框

$.ajax({ url: url + "option=dropdown",
  type: "post",
  data: "znstr=" + str + "&znclass="+ zclass + "",
  datatype: "html",
  error: function(xmlhttprequest) { },
  success: function(data) {
  if(data!="false")
  {  
  if(data.tostring().length > 0)
  {
  cleardrop(znclass);  
  }  
  var vars = new array(); 
  vars = data.tostring().split(',');
  for(var i =0;i< (vars.length) ;i=i+2 )
  {
  switch(znclass)
  {
  case 2:
  $("#citytwo").append("<option value='"+vars[i+1]+"'>"+vars[i]+"</option>");
  break;
  case 3:
  $("#citythree").append("<option value='"+vars[i+1]+"'>"+vars[i]+"</option>");
  break;
  case 4:
  $("#cityfour").append("<option value='"+vars[i+1]+"'>"+vars[i]+"</option>");
  break;
  }
   
  }
  %>
 
  下面看个完整实例
 
  <%@ page contenttype = "text/html; charset=gbk"  import="java.util.*,com.wehave.hyerp.procurement.domain.cgsqd"%>
<%@ taglib uri="struts-html" prefix="html" %>
<%@ taglib uri="struts-logic" prefix="logic" %>
<%@ taglib uri="struts-bean" prefix="bean" %>
<html>
    <head>
        <title> </title>
        <link rel = "stylesheet" type = "text/css教程" href = "../css/olstyle.css">   
        <script type="text/网页特效">
        var req;
        window.onload=function(){
        }
       
        function change_select()
        {
            var zhi=document.getelementbyid('m_gykfwzlbb_lbbm').value;
            var url="sqdselect.go?method=getskill&id="+zhi;
            if(zhi=="0"){
                alert("请选择您要察看的信息");
                   return;
            }else{
                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 change_select2()
        {
            var zhi=document.getelementbyid('m_lbbm_se').value;
            //alert(zhi.substring(0,2));
            if(zhi=="0"){
                alert("请选择您要察看的信息");
                   return;
               }
            if(zhi.substring(0,2)=="wy"){
                var url="sqdselect.go?method=getskill2&id="+zhi;
                if(window.xmlhttprequest)
                {
                    req=new xmlhttprequest();
                }else if(window.activexobject)
                {
                    req=new activexobject("microsoft.xmlhttp");
                }
               
                if(req)
                {
                    req.open("get",url,true);
                    req.onreadystatechange=callback2;
                    req.send(null);
                }
            }else{
                parent.topfram.location ="sqdselectall.go?method=getlistall&id="+zhi;
            }
        }
       
        function change_select3()
        {
            var zhi=document.getelementbyid('m_lbbm_th').value;
            //alert(zhi.substring(0,2));
            if(zhi=="0"){
                alert("请选择您要察看的信息");
                   return;
               }else{
                parent.topfram.location ="sqdselectall.go?method=getlistall2&id="+zhi;
            }
        }
       
        function callback()
        {
            if(req.readystate == 4)
            {
                if(req.status == 200)
                {
                    parsemessage();
                }else{
                    alert("not able to retrieve description"+req.statustext);
                }
            }
        }
       
        function callback2()
        {
            if(req.readystate == 4)
            {
                if(req.status == 200)
                {
                    parsemessage2();
                }else{
                    alert("not able to retrieve description"+req.statustext);
                }
            }
        }
       
        function parsemessage()
        {
            var xmldoc=req.responsexml.documentelement;
            var xsel=xmldoc.getelementsbytagname('select');
            var select_root=document.getelementbyid('m_lbbm_se');
            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);
                try{
                    select_root.add(option);
                }catch(e){
                }
            }
        }
       
        function parsemessage2()
        {
            var xmldoc=req.responsexml.documentelement;
            var xsel=xmldoc.getelementsbytagname('select');
            var select_root=document.getelementbyid('m_lbbm_th');
            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);
                try{
                    select_root.add(option);
                }catch(e){
                }
            }
        }
       
       
       
    </script>
    </head>

<body bgcolor = "#c8d0d4">
    <html:form action="/cgsqdnewaction.go">
    <table class = "cbtoolbar" id = "idtoolbar" cellpadding = '0' cellspacing = '0'>
        <tr align = "left" valign = "top" >
            <td  nowrap>&nbsp;物质类别:&nbsp;&nbsp;
                <html:select property="m_gykfwzlbb_lbbm" onchange="change_select()">
                    <html:option value="0">请选择</html:option>
                       <html:options collection="lbflist" property="m_gykfwzlbb_lbbm" labelproperty="m_gykfwzlbb_lbmc"/>
                </html:select> &nbsp;
                <html:select property="m_lbbm_se" styleid="m_lbbm_se" onchange="change_select2()">
                    <html:option value="0">&nbsp;&nbsp;&nbsp;</html:option>
                </html:select>
                <html:select property="m_lbbm_th" styleid="m_lbbm_th" onchange="change_select3()">
                    <html:option value="0">&nbsp;&nbsp;&nbsp;</html:option>
                </html:select>
               
            </td>
           
        </tr>
    </table>
     </html:form>
</body>
</html>

action

public actionforward doselectwzlb(
            actionmapping mapping,
            actionform form,
            https教程ervletrequest req,
            httpservletresponse res) {
        httpsession session = req.getsession();
        usersession usersession =
            (usersession) session.getattribute("usersession");
        permission.setuserid(usersession.getuserid());
        permission.setusername(usersession.getusername());
        permission.setmodulename("m_cgsqd");
        permission.setactionstr("'m_select'");
        if(permissionservice.checkuserpermission(permission)){
            int updatesign=0;
            try{
                cgsqdservice.updatecgsqwzhzb_sqsl();
                updatesign=1;
            }catch(exception e){
                e.printstacktrace();
                updatesign=0;
            }
            if(updatesign==1){
                list lbflist=cgsqdservice.treelistwzlb2();
                req.setattribute("lbflist",lbflist);
                return mapping.findforward("tools");
            }else{
                return null;
            }
        }else{
            return mapping.findforward("failure");
        }
    }
   
    /** *//**
     *
     * 查询物质编码类别列表操作(二级)
     * */
    public actionforward doselectwzlb1(
            actionmapping mapping,
            actionform form,
            httpservletrequest req,
            httpservletresponse res) {
        httpsession session = req.getsession();
        usersession usersession =
            (usersession) session.getattribute("usersession");
        permission.setuserid(usersession.getuserid());
        permission.setusername(usersession.getusername());
        permission.setmodulename("m_cgsqd");
        permission.setactionstr("'m_select'");
        if(permissionservice.checkuserpermission(permission)){
            int updatesign=0;
            try{
                cgsqdservice.updatecgsqwzhzb_sqsl();
                updatesign=1;
            }catch(exception e){
                e.printstacktrace();
                updatesign=0;
            }
            if(updatesign==1){
                list lbflist=cgsqdservice.treelistwzlb2();
                req.setattribute("lbflist",lbflist);
                return mapping.findforward("tools1");
            }else{
                return null;
            }
        }else{
            return mapping.findforward("failure");
        }
    }
   
    /** *//**
     *
     * 查询物质编码类别列表操作(三级)
     * */
    public actionforward getskill(
            actionmapping mapping,
            actionform form,
            httpservletrequest req,
            httpservletresponse res) {
        httpsession session = req.getsession();
        usersession usersession =
            (usersession) session.getattribute("usersession");
        permission.setuserid(usersession.getuserid());
        permission.setusername(usersession.getusername());
        permission.setmodulename("m_cgsqd");
        permission.setactionstr("'m_select'");
        if(permissionservice.checkuserpermission(permission)){
            string id=req.getparameter("id");
           
            res.setcontenttype("text/xml;charset=gbk");
            res.setheader("cache-control","no-cache");
            string xml_start="<?xml version="1.0" encoding="gbk"?>";
            xml_start+="<selects>";
            string xml_end="</selects>";
            string xml="<select><value>0</value><text>请选择</text></select>";
            string m_lbbm_se="";
            string m_lbmc_se="";
            list lbflist=null;
            if(id.equals("wy")){
                lbflist=cgsqdservice.treelistwzlb3_2(id);
            }else{
                lbflist=cgsqdservice.treelistwzlb3_1(id);   
            }
            iterator it=lbflist.iterator();
            while(it.hasnext()){
                cgsqd cgsqd=(cgsqd)it.next();
                m_lbbm_se=cgsqd.getm_gykfwzlbb_lbbm();
                m_lbmc_se=cgsqd.getm_gykfwzlbb_lbmc();
                xml +="<select><value>"+m_lbbm_se+"</value><text>"+m_lbmc_se+"</text></select>";
            }
            string last_xml=xml_start+xml+xml_end;
            logger.debug("xml是："+last_xml);
            try {
                res.getwriter().write(last_xml);
            } catch (ioexception e) {
                e.printstacktrace();
            }
            return null;
        }else{
            return null;
        }
    }

时间： 2025-01-28 05:22:21

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