two dropDownList in gridview country and city, Change city value when selected value from Country (RowCommand), Please help me fast [Answered]RSS

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  Khalid Salam...

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  two dropDownList in gridview country and city, Change city value when selected value from Country...

  Mar 04, 2017 08:44 AM|Khalid Salameh|LINK

  Hello,

  I Have two DropDownList in gridView, first one is Country and second one is City, I fill the country DropDownList in (OnRowDataBound), then what I want, when the user selected value from country dropDownList, the City DorpDownList must fill with value of Country Selected,

  I tried the command name and command arguments, but the command name Or command argument not show in attributes of dropdownlist?

  how can I do this please?

  Here is My Code

   protected void grvList_RowDataBound(object sender, GridViewRowEventArgs e)
          {
              if (e.Row.RowType == DataControlRowType.DataRow)
              {
                  DataTable dtCountry = new DataTable();
                  dtCountry.Columns.Add("ID");
                  dtCountry.Columns.Add("NAME");
                  dtCountry.Rows.Add(1, "JORDAN");
                  dtCountry.Rows.Add(1, "UAE");
                 
                  DropDownList ddlCountry = (DropDownList)e.Row.FindControl("ddlCountry") as DropDownList;
                  ddlCountry.DataSource = dtCountry;
                  ddlCountry.DataValueField = "ID";
                  ddlCountry.DataTextField = "NAME";
                  ddlCountry.DataBind();
   }
          }
  
  

   

   <asp:GridView ID="grvList" runat="server" AutoGenerateColumns="false" OnRowDataBound="grvList_RowDataBound" OnRowCommand="grvList_RowCommand">
              <Columns>
              <asp:BoundField HeaderText="NAME" DataField="NAME"/>
              <asp:BoundField HeaderText="GENDER" DataField="GENDER" />
                  <asp:TemplateField>
                      <ItemTemplate>
                          <asp:DropDownList ID="ddlCountry" runat="server">
                          </asp:DropDownList>
                      </ItemTemplate>
                  </asp:TemplateField>
                  <asp:TemplateField>
                      <ItemTemplate>
                          <asp:DropDownList ID="ddlCity" runat="server">
                          </asp:DropDownList>
                      </ItemTemplate>
                  </asp:TemplateField>
              </Columns>

   

• • Reply
  oned_gk

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  Re: two dropDownList in gridview country and city, Change city value when selected value from Cou...

  Mar 04, 2017 09:44 AM|oned_gk|LINK

      protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
      {
          DropDownList ddlCountry=(DropDownList)sender;
          DropDownList ddlCity = (DropDownList)ddl1.NamingContainer.FindControl("ddlCity");
          //populate ddl2 items based ddl1.selectedvalue
      }

  Programming to simplify, don't look for difficult way
  Suwandi - Non Graduate Programmer
• • Reply
  Khalid Salam...

  Member

  10 Points

  51 Posts

  Re: two dropDownList in gridview country and city, Change city value when selected value from Cou...

  Mar 04, 2017 10:14 AM|Khalid Salameh|LINK

  oned_gk Thank you very much.

  I tried it and it works successfully ,, but please, if you can explain what is the NamingContainer do? what is the benefits? when should be used?

• • Reply
  oned_gk

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  Re: two dropDownList in gridview country and city, Change city value when selected value from Cou...

  Mar 04, 2017 11:54 AM|oned_gk|LINK

  I have simplify the codes, the dropdown namingcontainer is the gridviewrow

      protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
      {
          DropDownList ddlCountry=(DropDownList)sender;
          GridViewRow row = (GridViewRow)ddlCountry.NamingContainer;
          DropDownList ddlCity = (DropDownList)row.FindControl("ddlCity");
          //populate ddl2 items based ddl1.selectedvalue
      }

  the dropdown is inside gridviewrow

  Programming to simplify, don't look for difficult way
  Suwandi - Non Graduate Programmer