ztree连接数据库，实现下拉菜单

    $(document).ready(function(){
        var treeObj = $("#treeDemo");
        $.fn.zTree.init(treeObj, setting, zNodes);
        department_select();//页面加载完成执行方法
    });
            /*ztree实现下拉菜单*/
    var setting = {
        data: {
            simpleData: {
                enable: true,
                idKey: "id",
                pIdKey: "pId",
                rootPId: 0
            }
        }
    };
            /*通过查询area确定区域，根据区域id确定下面的部门*/
            /*将数据库里面的部门信息查询出来，循环显示出来*/
    /*获取区域id和区域名称*/
    var arr_areaid = Array();
    var arr_areaname = Array();
    var url="{:U('area/select_area')}";//ajax传值路径
    $.ajax({
        type:'post',
        data:"",
        url:url,
        async:false,//设置ajax同步和 异步，如果想在ajax外面用数据，需要将其设置为同步，运行完成之后才能用数据
        dataType:"json",
        success: function (data) { 
            for(var i = 0;i < data.length;i++){
                arr_areaid[i] = data[i].areaid;
                arr_areaname[i] = data[i].areaname;
            }
        }
    });
//    console.log("!!!"+arr_areaid);//区域id
//    console.log("!!!"+arr_areaname);//区域名称
    /*获取部门名称以及所属于的区域id*/
    var arr_departmentname = Array();
    var arr_department_areaid = Array();
    var url="{:U('department/select_department')}";//ajax传值路径
    $.ajax({
        type:'post',
        data:"",
        url:url,
        async:false,
        dataType:"json",
        success: function (data) { 
            for(var i = 0;i < data.length;i++){
                arr_departmentname[i] = data[i].departmentname;
                arr_department_areaid[i] = data[i].areaid
            }
        }
    });
//    console.log(arr_departmentname);
//    console.log(arr_department_areaid);
    var zNodes =[];
    for(var i = 0;i < arr_areaid.length;i++){
        zNodes.push({ id:arr_areaid[i], pId:0, name:arr_areaname[i], open:true,iconClose:"__PUBLIC__img/user/12.png",iconOpen:"__PUBLIC__img/user/13.png"});
        for(var j = 0;j < arr_departmentname.length;j++){
            if(arr_areaid[i] == arr_department_areaid[j]){
                zNodes.push({ id:(""+i+13+j), pId:arr_areaid[i], name:arr_departmentname[j],icon:"__PUBLIC__img/user/14.png"}) ;
            }    
        }
    }