之前写了一篇2级联动的,将其修改,就可以得到3级联动菜单。
BigClass
表结构:
测试数据:
SmallClass1
表结构:
测试数据:
SmallClass2
表结构:
测试数据:
aspx页面:
aspx代码:
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cs代码:
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using System;
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using System.Text;
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using System.Collections;
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using System.ComponentModel;
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using System.Data;
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using System.Data.SqlClient;
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using System.Drawing;
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using System.Web;
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using System.Web.SessionState;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.HtmlControls;
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namespace AspNetTest.Common
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{
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/// <summary>
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/// liandong_three 的摘要说明。
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/// </summary>
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public class liandong_three : System.Web.UI.Page
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{
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protected System.Web.UI.WebControls.DropDownList DropDownList1;
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protected System.Web.UI.WebControls.DropDownList DropDownList2;
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protected System.Web.UI.WebControls.DropDownList DropDownList3;
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private void Page_Load(object sender, System.EventArgs e)
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{
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BindDDLCreateJsdArray();
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// 在此处放置用户代码以初始化页面
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}
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private void BindDDLCreateJsdArray()
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{
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string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
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SqlConnection conn = new SqlConnection(ConnectionString);
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string sql = "select b.d_name as bname,b.d_id as bid,s.d_id as sid,s.d_name as sname,ss.d_id as ssid,ss.d_name as ssname from SmallClass1 s,BigClass b,SmallClass2 ss where b.d_id=s.d_classid and s.d_id=ss.d_classid";
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SqlCommand cmd = new SqlCommand(sql, conn);
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conn.Open();
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SqlDataReader dr = cmd.ExecuteReader();
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StringBuilder sb = new StringBuilder();
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sb.Append("<script language=javascript>\n");
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//定义JS数组
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sb.Append("var arrSmallClass2 = new Array();\n");
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sb.Append("var arrSmallClass1 = new Array();\n");
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ListItem lt = new ListItem("=选择大类=", "");
DropDownList1.Items.Clear();
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DropDownList1.Items.Add(lt);
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lt = new ListItem("=选择小类1=", "");
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DropDownList2.Items.Add(lt);
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lt = new ListItem("=选择小类2=", "");
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DropDownList3.Items.Add(lt);
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int i = 0;
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int j = 0;
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int PreBigClassId = 0;
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int PreSmallClass1Id = 0;
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while(dr.Read())
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{
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string BigClassName = dr["bname"].ToString();
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int BigClassId = Convert.ToInt32(dr["bid"].ToString());
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string SmallClass1Name = dr["sname"].ToString();
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int SmallClass1ID = Convert.ToInt32(dr["sid"].ToString());
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string SmallClass2Name = dr["ssname"].ToString();
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int SmallClass2ID = Convert.ToInt32(dr["ssid"].ToString());
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lt = new ListItem(BigClassName, BigClassId.ToString());
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//防止创建重复值
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if(BigClassId != PreBigClassId)
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{
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DropDownList1.Items.Add(lt);
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PreBigClassId = BigClassId;
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}
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lt = new ListItem(SmallClass1Name, SmallClass1ID.ToString());
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if(SmallClass1ID != PreSmallClass1Id)
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{
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DropDownList2.Items.Add(lt);
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PreSmallClass1Id = SmallClass1ID;
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/*
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给JS数组赋值。
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注意:JS中不能直接创建二维数组,要创建可以这样
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var arrTest = new Array();
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arrTest[0] = new Array();
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arrTest[0][0] = 1
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*/
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sb.Append("arrSmallClass1["+ j +"] = new Array();\n");
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sb.Append("arrSmallClass1["+ j +"][0] = " + SmallClass1ID.ToString() + ";\n");
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sb.Append("arrSmallClass1["+ j +"][1] = \"" + SmallClass1Name + "\";\n");
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sb.Append("arrSmallClass1["+ j +"][2] = " + BigClassId + ";\n");
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j++;
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}
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sb.Append("arrSmallClass2["+ i +"] = new Array();\n");
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sb.Append("arrSmallClass2["+ i +"][0] = " + SmallClass2ID.ToString() + ";\n");
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sb.Append("arrSmallClass2["+ i +"][1] = \"" + SmallClass2Name + "\";\n");
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sb.Append("arrSmallClass2["+ i +"][2] = " + SmallClass1ID + ";\n");
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i++;
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}
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sb.Append("</script>");
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//将JS字符串输出到客户端
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Page.Response.Write(sb.ToString());
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//大类change事件
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DropDownList1.Attributes.Add("onchange", "change1();change2()");
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//小类1change事件
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DropDownList2.Attributes.Add("onchange", "change2();");
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}
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Web 窗体设计器生成的代码
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}
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}
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