Forms Data Controls :: Cascading Dropdownlist / Codes Not Working

Mar 16, 2011

I have 2 dropdownlists and on change 1st dropdownlist (ddlPlant), the 2nd dropdownlist (ddlCategoryName) refreshes its data based on 1st dropdownlist value. However, the codes does not worked.

My codes:

[Code]....

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Data Controls :: Cascading DropDownList Not Working When DateValueField Is Set

Jan 5, 2013

I have 2 dropdownlist in my page

1--ddlTarde
2--ddlTradeClass

and 2 table in database

1-Trade table

ID Tname
1 Industry
2 Cloth

2-Tradeclass

ID Class Tname
1 Electronic Industry
2 Car Industry
3 Scarf Cloth
4 Pants Cloth

I bind ddlTrade from Tradetable and I want when users click on Item from ddlTrade it bind data from ddlTradeclass that TNAME=ddlTrade.selectedItem in ddltradeClass for this I used below code

for binding ddltrade

BindDropDownList(DDLtrade, "tradename", "Name", "id");
protected void BindDropDownList(DropDownList DDL, string spname, string dataTextfield, string dataValuefield) {
SqlCommand _cmd = new SqlCommand(spname, _cn);
_cmd.CommandType = CommandType.StoredProcedure;
_cn.Open();
SqlDataReader _dr = _cmd.ExecuteReader();

[Code] ....

NOW my problem is that when I select Item from ddlTrade it didn't show any thing in ddlTradeClass but when I delete this code

DDL.DataValueField=dataValuefield;

from BindDropDownList Metod and change like below:

protected void BindDropDownList(DropDownList DDL, string spname, string dataTextfield)
{
SqlCommand _cmd = new SqlCommand(spname, _cn);
_cmd.CommandType = CommandType.StoredProcedure;
_cn.Open();

[Code] ....

It worked correctly I mean when I click Item from ddlTrade in ddlTradeClass show data from TradeClass Table

so here what should I do ? I need DataValueField in ddlbinding ... Why this problem happen?

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Cascading Dropdownlist Not Working

Sep 23, 2010

i tried to change an cascading dropdownlist example

http://www.codedigest.com/Articles/jQuery/224_Building_Cascading_DropDownList_in_ASPNet_Using_jQuery_and_JSON.aspx

But i get always the message "Microsoft JScript runtime error: Object expected"

<asp:Content ID="Content1" ContentPlaceHolderID="contentplaceholderHEAD" runat="Server">
</script src="~/_scripts/jQuery-1.4.2.js" type="text/javascript">
<script language="javascript">[code]...

Can't tag all my code as "Sourceode" because its not working corectly..

<asp:Content ID="Content2" ContentPlaceHolderID="maincontent" runat="Server">
<div> [code]...

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Jan 8, 2013

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[URL]

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Forms Data Controls :: Detailsview Edit For Cascading Dropdownlist

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I have created two dropdown lists. The 2nd DDL depends for values on the 1st DDL. I have written code on the SelectedIndexChanged event of 1st DDL to change values of 2nd DDL. also i have used detailsview. In the template field i have used 2 DDL mentioned above. they are having SelectedValue='<%# Bind("") %>' property. Everything works fine but when i tried to edit record in detailsview & select value from 1st DDL then it gives me following error.

Server Error in '/' Application. Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.

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Feb 9, 2011

I have an ASP.NET/C# web project that uses an Entity Data Model and Entity Framework to interact with my database. I also have a DetailsView control that will serve as the control used to insert a new record. The user will need to be able to select from multiple,
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<asp:Repeater ID="rpt" runat="server" OnItemDataBound="rpt_ItemDataBound">
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<tr>

[Code].....

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How do I fill ProductNameID on selection of ProductCategoryID dropdown by passing

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aspx Code

<asp:GridView ID="gridPosition" runat="server" AutoGenerateColumns="False" ShowFooter="True" OnRowDataBound="gridPosition_onRowDataBound"
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[Code] .....

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[URL] ....

if (!IsPostBack)
{
if (cookie["Location"] == null)
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[Code] ......

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[CODE].....

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[URL]

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[Code]....

aspx.cs

[Code]....

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<
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runat="server"
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[Code]....

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[Code]....

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