EasyUI ComboTree 递归绑定详解

html代码：

 <input id="Series" name="Series" class="easyui-combotree"  method=‘get‘/> 

js代码：

$(document).ready(function () {
 $(‘#Series‘).combotree({
        //需要返回的json格式
        //data: [
        //    {
        //        "id": "222", "text": "黑色系列",
        //        "children": [
        //            { "id": "280", "text": "黑1"},
        //            { "id": "282", "text": "黑2"}
        //        ]
        //    },
        //    {
        //        "id": "225", "text": "白色系列",
        //        "children": [{ "id": "281", "text": "白1" },
        //            { "id": "283", "text": "白2" }
        //        ]
        //    }],
        //请求数据的一般处理程序的路径
        url: getRootPath() + ‘/handler/Page/Product/ProductClassify.ashx?action=MList‘,
        multiple: false,//是否有多选框
        lines: true//选项前是否显示虚线
    });
});    

一般处理程序：

<%@ WebHandler Language="C#" Class="ProductClassify" %>

using System;
using System.Web;
using System.Data;
using System.Text;
using System.Web.Script.Serialization;

public class ProductClassify : IHttpHandler {
    HttpContext Context = null;
    JiaSoft.BLL.Classify_BLL PClassiyList = new JiaSoft.BLL.Classify_BLL();
    public void ProcessRequest (HttpContext context) {
        Context = context;
        string action = context.Request["action"].ToString();
        responseAction(action);
    }
    private void responseAction(string action)
    {
       if (action.Equals("MList"))  //获得多级列表
        {
            InitComboTree(Context, PClassiyList);

        }
    }
    //初始化ComboTree数据
    public void InitComboTree(HttpContext context, JiaSoft.BLL.Classify_BLL PClassiyList)
    {
            DataTable dt;
            System.Text.StringBuilder sb = new System.Text.StringBuilder(); 　　　　　　　//数据库设计名称、id、父类id 初始化先获取父类id=0的数据集，返回数据是DataTable类型
            dt = PClassiyList.GetList("  Mtype=102 and ParentID=0 ").Tables[0];
            string sbs =string.Empty;
            if (dt == null)
            {
                sbs= "[]";
            }
            StringBuilder builder = new StringBuilder();
            builder.Append("[");
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    builder.Append("{");

                    builder.Append("\"id\":" + new JavaScriptSerializer().Serialize(dt.Rows[i]["ClassifyID"].ToString()));
                    builder.Append(",");
                    builder.Append("\"text\":" + new JavaScriptSerializer().Serialize(dt.Rows[i]["CodeName"].ToString()));
                    builder.Append(",");　　　　　　　　　　　　//调用递归方法
                    builder = InitChild(builder, dt.Rows[i]["ClassifyID"].ToString(), PClassiyList);
                    builder.Append("}");
                    if (i < (dt.Rows.Count - 1))
                    {
                        builder.Append(",");
                    }
                }
            }
            builder.Append("]");
            sbs = builder.ToString();
            Context.Response.Write(sbs);
    }
    //递归子类
    public StringBuilder InitChild(StringBuilder builder, string parentID, JiaSoft.BLL.Classify_BLL PClassiyList)
    {
        DataTable dt = PClassiyList.GetList("  Mtype=102 and ParentID=" + parentID ).Tables[0];
        if (dt == null)
        {
            builder.Append("");
        }
        builder.Append("\"children\":[");
        if (dt.Rows.Count > 0)
        {
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                builder.Append("{");

                builder.Append("\"id\":" + new JavaScriptSerializer().Serialize(dt.Rows[i]["ClassifyID"].ToString()));
                builder.Append(",");
                builder.Append("\"text\":" + new JavaScriptSerializer().Serialize(dt.Rows[i]["CodeName"].ToString()));
                builder.Append(",");
                builder = InitChild(builder, dt.Rows[i]["ClassifyID"].ToString(), PClassiyList);
                builder.Append("}");
                if (i < (dt.Rows.Count - 1))
                {
                    builder.Append(",");
                }
            }
        }
        builder.Append("]");
        return builder;
    }
    public bool IsReusable {
        get {
            return false;
        }
    }

}

效果图：