02-26c# three-level provinces and cities Ajax linkage controls, using UpdatePanel, and page values

Source: Internet
Author: User

First step: Setting up the interface

1<%@ Control language="C #"autoeventwireup="true"codefile="PCAControl.ascx.cs"inherits="Pcacontrol"%>2<asp:scriptmanager id="ScriptManager1"runat="Server">3</asp:ScriptManager>4<asp:updatepanel id="UpdatePanel1"runat="Server">5<ContentTemplate>6<asp:dropdownlist id="Ddlprovice"runat="Server"appenddatabounditems="true"autopostback="true" 7Onselectedindexchanged="ddlprovice_selectedindexchanged">8<asp:listitem text="-Please select province-"Value=""></asp:ListItem>9</asp:DropDownList>Ten<asp:dropdownlist id="ddlcity"runat="Server"autopostback="true"  OneOnselectedindexchanged="ddlcity_selectedindexchanged"> A<asp:listitem text="-Please select CITY-"Value=""></asp:ListItem> -</asp:DropDownList> -<asp:dropdownlist id="Ddlarea"runat="Server"> the<asp:listitem text="-Please select County District-"Value=""></asp:ListItem> -</asp:DropDownList> -</ContentTemplate> -</asp:UpdatePanel>

Step two: C # write method functions

1 usingSystem.Collections.Generic;2 usingSystem.Linq;3 usingsystem.web;4 usingSystem.Data;5 usingSystem.Web.UI;6 usingSystem.Web.UI.WebControls;7  8  Public Partial classPCAControl:System.Web.UI.UserControl9 { Ten   One     protected voidPage_Load (Objectsender, EventArgs e) A     {  -         if(!IsPostBack) -         {  the bindprovince (); -         }  -     }  -   +     //Loading Provinces -     protected voidbindprovince () +     {  ADataTable dt = Maticsoft.DBUtility.DbHelperOra.Query ("SELECT DISTINCT Province from Sy_citycode GROUP by province"). tables[0];  atDdlprovice.datatextfield ="Province";  -Ddlprovice.datavaluefield ="Province";  -Ddlprovice.datasource =DT; - Ddlprovice.databind (); -     }  -   in     //Load City -     protected voidDdlprovice_selectedindexchanged (Objectsender, EventArgs e) to     {  +         stringSelectpro =Ddlprovice.selectedvalue; -         if(!string. IsNullOrEmpty (Selectpro)) the         {  * ddlCity.Items.Clear (); $Ddlcity.appenddatabounditems =true; Panax NotoginsengDdlCity.Items.Insert (0,NewListItem ("-Please select CITY-",""));  -DataTable dt1 = Maticsoft.DBUtility.DbHelperOra.Query ("SELECT City from Sy_citycode Where province= '"+ Selectpro +"' Group by City '"). tables[0];  theDdlcity.datatextfield =" City";  +Ddlcity.datavaluefield =" City";  ADdlcity.datasource =dt1; the Ddlcity.databind (); +         }  -     }  $   $     //Load County Area -     protected voidDdlcity_selectedindexchanged (Objectsender, EventArgs e) -     {  the         stringSelectcity =Ddlcity.selectedvalue; -         if(!string. IsNullOrEmpty (selectcity))Wuyi         {  the ddlArea.Items.Clear (); -Ddlarea.appenddatabounditems =true;  WuDdlArea.Items.Insert (0,NewListItem ("-Please select County District-",""));  -DataTable DT2 = Maticsoft.DBUtility.DbHelperOra.Query ("SELECT area from Sy_citycode Where city= '"+ selectcity +"'"). tables[0];  AboutDdlarea.datatextfield =" Area";  $Ddlarea.datavaluefield =" Area";  -Ddlarea.datasource =DT2; - Ddlarea.databind (); -         }  A     }  +}

Step three: Call the function in the page

1 protected voidButton1_Click (Objectsender, EventArgs e)2 { 3     stringSelectedprov = ((DropDownList) Pcacontrol1.findcontrol ("Ddlprovice")). SelectedValue; 4     stringSelectedcity = ((DropDownList) Pcacontrol1.findcontrol ("ddlcity")). SelectedValue; 5     stringSelectedarea = ((DropDownList) Pcacontrol1.findcontrol ("Ddlarea")). SelectedValue; 6MscL. Jshelper.alert (Selectedprov +"-"+ selectedcity +"-"+Selectedarea, Page); 7}

02-26c# three-level provinces and cities Ajax linkage controls, using UpdatePanel, and page values

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