C# ASP.NET AJAX CascadingDropDown Selected value propriety problem
- by Eyla
Greetings,
I have a problem to use selected value propriety of CascadingDropDown.
I have 3 asp dropdown controls with ajax CascadingDropDown for each one of them.
I have no problem to bind data to the 3 CascadingDropDown but my problem is to rebind CascadingDropDown.
simply what I want to do is to select a record from Gridview which has the selected values for the CascadingDropDown that I want to pass then rebind the CascadingDropDown with selected value.
I'm posting my code down which include:
1-ASP.NET code.
2-Code behind to handle selected record from grid view.
3- web servisice that handle binding data to the 3 CascadingDropDown.
please advice how to rebind data to CascadingDropDown with selected value.
by the way I used selected value proprety as showning in my code but it is not working and there is no error.
Thank you,
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ASP.NET code
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<%@ Page Title="" Language="C#" MasterPageFile="~/Master.Master" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="IMAM_APPLICATION.WebForm1" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
DataKeyNames="idcontact_info" DataSourceID="ObjectDataSource1"
onselectedindexchanged="GridView1_SelectedIndexChanged">
<Columns>
<asp:CommandField ShowSelectButton="True" />
<asp:BoundField DataField="idcontact_info" HeaderText="idcontact_info"
InsertVisible="False" ReadOnly="True" SortExpression="idcontact_info" />
<asp:BoundField DataField="Work_Field" HeaderText="Work_Field"
SortExpression="Work_Field" />
<asp:BoundField DataField="Occupation" HeaderText="Occupation"
SortExpression="Occupation" />
<asp:BoundField DataField="sub_Occupation" HeaderText="sub_Occupation"
SortExpression="sub_Occupation" />
</Columns>
</asp:GridView>
<asp:Label ID="lbl" runat="server" Text="Label"></asp:Label>
<asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
DeleteMethod="Delete" InsertMethod="Insert"
OldValuesParameterFormatString="original_{0}" SelectMethod="GetData"
TypeName="IMAM_APPLICATION.DSContactTableAdapters.contact_infoTableAdapter"
UpdateMethod="Update">
<DeleteParameters>
<asp:Parameter Name="Original_idcontact_info" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp:Parameter Name="Work_Field" Type="String" />
<asp:Parameter Name="Occupation" Type="String" />
<asp:Parameter Name="sub_Occupation" Type="String" />
<asp:Parameter Name="Original_idcontact_info" Type="Int32" />
</UpdateParameters>
<InsertParameters>
<asp:Parameter Name="Work_Field" Type="String" />
<asp:Parameter Name="Occupation" Type="String" />
<asp:Parameter Name="sub_Occupation" Type="String" />
</InsertParameters>
</asp:ObjectDataSource>
<asp:DropDownList ID="cmbWorkField" runat="server" Style="top: 715px; left: 180px;
position: absolute; height: 22px; width: 126px">
</asp:DropDownList>
<asp:DropDownList runat="server" ID="cmbOccupation" Style="top: 745px; left: 180px;
position: absolute; height: 22px; width: 77px">
</asp:DropDownList>
<asp:DropDownList ID="cmbSubOccup" runat="server"
style="position:absolute; top: 775px; left: 180px;">
</asp:DropDownList>
<cc1:CascadingDropDown ID="cmbWorkField_CascadingDropDown" runat="server"
TargetControlID="cmbWorkField"
Category="WorkField"
LoadingText="Please Wait ..."
PromptText="Select Wor kField ..."
ServiceMethod="GetWorkField"
ServicePath="ServiceTags.asmx">
</cc1:CascadingDropDown>
<cc1:CascadingDropDown ID="cmbOccupation_CascadingDropDown" runat="server"
TargetControlID="cmbOccupation"
Category="Occup"
LoadingText="Please wait..."
PromptText="Select Occup ..."
ServiceMethod="GetOccup"
ServicePath="ServiceTags.asmx"
ParentControlID="cmbWorkField">
</cc1:CascadingDropDown>
<cc1:CascadingDropDown ID="cmbSubOccup_CascadingDropDown" runat="server"
Category="SubOccup"
Enabled="True"
LoadingText="Please Wait..."
ParentControlID="cmbOccupation"
PromptText="Select Sub Occup"
ServiceMethod="GetSubOccup"
ServicePath="ServiceTags.asmx"
TargetControlID="cmbSubOccup">
</cc1:CascadingDropDown>
</asp:Content>
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C# code behind
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protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
string strg = GridView1.SelectedDataKey["idcontact_info"].ToString();
int index = Convert.ToInt32(GridView1.SelectedDataKey["idcontact_info"].ToString());
//txtSearch.Text = GridView1.SelectedIndex.ToString();
// txtSearch.Text = GridView1.SelectedDataKey["idcontact_info"].ToString();
DSContactTableAdapters.contact_infoTableAdapter GetByIDAdapter = new DSContactTableAdapters.contact_infoTableAdapter();
DSContact.contact_infoDataTable ByID = GetByIDAdapter.GetDataByID(index);
//DSSearch.contact_infoDataTable FirstName = FirstNameAdapter.GetDataByFirstNameList(prefixText);
foreach (DataRow dr in ByID.Rows)
{
lbl.Text = dr["Work_Field"].ToString() + "....." + dr["Occupation"].ToString() + "....." + dr["sub_Occupation"].ToString();
cmbWorkField_CascadingDropDown.SelectedValue = dr["Work_Field"].ToString();
cmbOccupation_CascadingDropDown.SelectedValue = dr["Occupation"].ToString();
cmbSubOccup_CascadingDropDown.SelectedValue = dr["sub_Occupation"].ToString();
}
}
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web Service
.......................................................
[WebMethod]
public CascadingDropDownNameValue[] GetWorkField(string knownCategoryValues, string category)
{
//dsCarsTableAdapters.CarsTableAdapter makeAdapter = new dsCarsTableAdapters.CarsTableAdapter();
//dsCars.CarsDataTable makes = makeAdapter.GetAllCars();
DSContactTableAdapters.tag_work_fieldTableAdapter GetWorkFieldAdapter = new DSContactTableAdapters.tag_work_fieldTableAdapter();
DSContact.tag_work_fieldDataTable WorkFields = GetWorkFieldAdapter.GetDataByGetWorkField();
List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();
foreach (DataRow dr in WorkFields)
{
string Work_Field = (string)dr["work_Field_name"];
int idtag_work_field = (int)dr["idtag_work_field"];
values.Add(new CascadingDropDownNameValue(Work_Field, idtag_work_field.ToString()));
}
return values.ToArray();
}
[WebMethod]
public CascadingDropDownNameValue[] GetOccup(string knownCategoryValues, string category)
{
StringDictionary kv = CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
int idtag_work_field;
if (!kv.ContainsKey("WorkField") || !Int32.TryParse(kv["WorkField"], out idtag_work_field))
{
return null;
}
//dsCarModelsTableAdapters.CarModelsTableAdapter modelAdapter = new dsCarModelsTableAdapters.CarModelsTableAdapter();
//dsCarModels.CarModelsDataTable models = modelAdapter.GetModelsByCarId(makeId);
DSContactTableAdapters.tag_OccupTableAdapter GetOccupAdapter = new DSContactTableAdapters.tag_OccupTableAdapter();
DSContact.tag_OccupDataTable Occups = GetOccupAdapter.GetByOccup_ID(idtag_work_field);
//
List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();
foreach (DataRow dr in Occups)
{
values.Add(new CascadingDropDownNameValue((string)dr["Occup_Name"], dr["idtag_Occup"].ToString()));
}
return values.ToArray();
}
[WebMethod]
public CascadingDropDownNameValue[] GetSubOccup(string knownCategoryValues, string category)
{
StringDictionary kv = CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
int idtag_Occup;
if (!kv.ContainsKey("Occup") || !Int32.TryParse(kv["Occup"], out idtag_Occup))
{
return null;
}
//dsModelColorsTableAdapters.ModelColorsTableAdapter adapter = new dsModelColorsTableAdapters.ModelColorsTableAdapter();
//dsModelColors.ModelColorsDataTable colors = adapter.GetColorsByModelId(colorId);
DSContactTableAdapters.tag_Sub_OccupTableAdapter GetSubOccupAdapter = new DSContactTableAdapters.tag_Sub_OccupTableAdapter();
DSContact.tag_Sub_OccupDataTable SubOccups = GetSubOccupAdapter.GetDataBy_Sub_Occup_ID(idtag_Occup);
List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();
foreach (DataRow dr in SubOccups)
{
values.Add(new CascadingDropDownNameValue((string)dr["Sub_Occup_Name"], dr["idtag_Sub_Occup"].ToString()));
}
return values.ToArray();
}
