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EasyUI combox实现联动

很多时候都会用到combox的联动效果,选择上一个combox的值就自动带出这个值对应的其它信息,比如省市联动,最近我也刚好遇到了类似的要求,是用EasyUI  combobox 控件完成的,如果是ASP.NET 里面的DropDownList的话,那就很简单了,一个SelectIndexChange事件再加一个AutoPostBack就行了,下面就是我实现的功能,其实很简单,但是对于像我这样刚接触EasyUI,并且对JQ不熟悉的人来说还是有点费神。

首先是数据库:为此我特地做了一个测试数据库用来测试效果。

tb_Factory表为最上层
tb_Factory表中的FactoryID与tb_WorkCenter表中的FactoryID为主外键关系
tb_WorkCenter表中的WorkCenterID与tb_Lines表中的WorkCenterID为主外键关系

下面是前台页面代码,引用那些JQ的就不写了:

<body>
    <form id="form1" runat="server">
    <div>
        <div id="divcenter" style="width: 400px; height: 500px; position: absolute">
            <div id="divQuery" class="easyui-panel" title="查询">
                <table style="border: 0; width: 100%">
                    <tr style="height: 30px;">
                        <td style="text-align: right;" class="style2" align="right">
                            工厂:
                        </td>
                        <td style="text-align: left;" class="style1">
                            <select id="SelectF" class="easyui-combobox" data-options="valueField:'FactoryID',textField:'FactoryName',url:'Index.aspx?Oper=GetAllFactory',width:200,modal:true">
                            </select>
                        </td>
                    </tr>
                    <tr style="height: 30px;">
                        <td style="text-align: right;" class="style2" align="right">
                            工作中心:
                        </td>
                        <td style="text-align: left;" class="style1">
                            <select id="SelectW" class="easyui-combobox" data-options="valueField:'WorkCenterID',textField:'WorkCenterName',width:200">
                            </select>
                        </td>
                    </tr>
                    <tr style="height: 30px;">
                        <td style="text-align: right;" class="style2" align="right">
                            线别:
                        </td>
                        <td style="text-align: left;" class="style1">
                            <select id="SelectL" class="easyui-combobox" data-options="valueField:'LineID',textField:'LineName',width:200">
                            </select>
                        </td>
                    </tr>
                    <tr style="height: 30px;">
                        <td style="text-align: right;" class="style2" align="right">
                            日期:
                        </td>
                        <td style="text-align: left; font-weight: bold; padding-left: 10px;" class="style1">
                            <input id="StartDate_WorkGroup" type="text" style="width: 90px;" class="easyui-datebox" />至
                            <input id="EndDate_WorkGroup" type="text" style="width: 90px;" class="easyui-datebox" />
                        </td>
                    </tr>
                </table>
            </div>
        </div>
    </div>
    </form>
</body>

以下是脚本代码,通过JQ来实现combox的onSelect事件,重新创建新的URL,通过这个URL来使目标combox重新加载数据,在API上看到的方法:reload。

<script language="javascript" type="text/javascript">

        $(document).ready(function () {

            //Start:居中显示
            $("#divcenter").css("left", (($(document).width()) / 2 - (parseInt($("#divcenter").width()) / 2)) + "px");
            $("#divcenter").css("top", (($(document).height()) / 2 - (parseInt($("#divcenter").height()) / 2)) + "px");
            //End:居中显示

            //Start:设置combox的选择事件
            $('#SelectF').combobox({
                onSelect: function () {
                    var url = 'Index.aspx?Oper=GetWorkCenterListByFactoryID&FactoryID=' + $('#SelectF').combobox('getValue');
                    $('#SelectW').combobox('reload', url);
                }
            });

            $('#SelectW').combobox({
                onSelect: function () {
                    var url = 'Index.aspx?Oper=GetLineListByWorkCenterID&WorkCenterID=' + $('#SelectW').combobox('getValue');
                    $('#SelectL').combobox('reload', url);
                }
            });
            //End:设置combox的选择事件

        });


            </script>


下面在cs文件里面根据前台的请求,分别作出相应的处理,比如前台请求查询工厂,那后台就执行查询工厂的方法,其它的也是一样:

using System;
using System.Collections.Generic;

using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Test
{
    public partial class Index : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Request.QueryString["Oper"] != null) 
            {
                string _FactoryID;
                string _WorkCenterID;

                //根据前台的请求进行分别处理。
                switch (Request.QueryString["Oper"])
                {
                        //初始化的时候加载所有的工厂。
                    case "GetAllFactory":
                        GetAllFactory();
                        break;
                    case "GetWorkCenterListByFactoryID":
                        //前台发出请求的时候会传递一个工厂ID的参数进来,这里接收到这个参数,
                        //作为条件进行查询该工厂下面的工作中心。
                        _FactoryID = Request.QueryString["FactoryID"];
                        GetWorkCenterByFactoryID(_FactoryID);
                        break;
                    case "GetLineListByWorkCenterID":
                        //同上
                        _WorkCenterID = Request.QueryString["WorkCenterID"];
                        GetLineByWorkCenterID(_WorkCenterID);
                        break;
                }
            }
        }

        //*******************************************
        //以下部分的函数都是将DataTable类型的结果转换为JSON格式
        //*******************************************

        /// <summary>
        /// Get all factory
        /// </summary>
        /// <returns></returns>
        public void GetAllFactory()
        {
            var dt =new DAL().GetAllFactoryList();
            var json = JsonHelper.ConvertDataTable(dt);
            Response.Write(json);
            Response.End();
        }

        /// <summary>
        /// Get all workcenter by factory id
        /// </summary>
        /// <param name="FactoryID">Factory ID</param>
        /// <returns></returns>
        public void GetWorkCenterByFactoryID(string FactoryID)
        {
            var dt = new DAL().GetWorkCenterListByFactoryID(FactoryID);
            var json = JsonHelper.ConvertDataTable(dt);
            Response.Write(json);
            Response.End();
        }

        /// <summary>
        /// Get all lines by workcenter id
        /// </summary>
        /// <param name="WorkCenterID">Workcenter ID</param>
        /// <returns></returns>
        public void GetLineByWorkCenterID(string WorkCenterID)
        {
            var dt = new DAL().GetLineListByWorkCenterID(WorkCenterID);
            var json = JsonHelper.ConvertDataTable(dt);
            Response.Write(json);
            Response.End();
        }
    }
}



 

using System;
using System.Collections.Generic;
using System.Web;
using System.Data;
namespace Test
{
    public class DAL
    {
        /// <summary>
        /// Get all factory
        /// </summary>
        /// <returns></returns>
        public DataTable GetAllFactoryList() 
        {
            string strSql = "SELECT FactoryID,FactoryName FROM dbo.tb_Factory (NOLOCK) ORDER BY 2 ";
            return new DataAccess().GetDataTable(strSql);
        }

        /// <summary>
        /// Get all workcenter by factory id
        /// </summary>
        /// <param name="FactoryID">Factory ID</param>
        /// <returns></returns>
        public DataTable GetWorkCenterListByFactoryID(string FactoryID) 
        {
            string strSql = "SELECT WorkCenterID,WorkCenterName FROM tb_WorkCenter (NOLOCK) WHERE FactoryID='" + FactoryID + "' ORDER BY WorkCenterName";
            return new DataAccess().GetDataTable(strSql);
        }

        /// <summary>
        /// Get all lines by workcenter id
        /// </summary>
        /// <param name="WorkCenterID">Workcenter ID</param>
        /// <returns></returns>
        public DataTable GetLineListByWorkCenterID(string WorkCenterID) 
        {
            string strSql = " SELECT LineID,LineName FROM tb_Lines (NOLOCK) WHERE WorkCenterID='" + WorkCenterID + "' ORDER BY LineName";
            return new DataAccess().GetDataTable(strSql);
        }
    }
}


最后看一下效果: