Forms Data Controls :: Populating DropDownList In ListView While Rendering?
Dec 12, 2010
I have a ListView that I need to populate a dropdownlist while rendering. For each rown in my table has a field called sizes which has data that looks like this "blue; red; yellow; green", I need to render a dropdownlist in the ItemTemplate with these values, I tried placing a PlaceHolder but I don't know how to populate it. I have tried to populate it OnItemDataBound and OnUnload but neither seem to work.
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Similar Messages:
Jan 19, 2010
I have the following ListView (extra code removed for clarity) :
<asp:ListView ID="lvParticipants" runat="server" DataSource='<%# Eval("Participants") %>' >
<EditItemTemplate>
<asp:DropDownList ID="ddlCountry" runat="server" SelectedValue='<%# Eval("Country") %>'
DataSource="<%# GetCountries() %>" DataTextField="Text" DataValueField="Value" />
</EditItemTemplate>
<InsertItemTemplate>
<asp:DropDownList ID="ddlCountry" runat="server" SelectedValue='<%# Eval("Country") %>'
DataSource="<%# GetCountries() %>" DataTextField="Text" DataValueField="Value" />
</InsertItemTemplate>
</asp:ListView>
The Insert row in the ListView has an empty DropDownList and GetCountries() is not called. However, if I click the Edit button on an existing row, GetCountries() is called twice (not sure why) and the DropDownList is properly populated. Why isn't the InsertItemTemplate DropDownList getting populated?
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Mar 5, 2010
I have a dropdownlist in EditItemTemplate and InsertItemTemplate which I want it to populate at the runtime while Inserting an item or Editing an item.
I am facing an issue regarding populating a dropdownlist dynamically while in Edit and Insert mode. There are 0 Records in my table and it shows "Empty Data message" in my Listview control. Even the ItemDataBound event does not fire. So I am not able to find the dropdownlist in that listview.
This is my Aspx code which shows only InsertItemTemplate and EditItemTemplate.
[Code]....
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Jan 16, 2010
I have the following (abbreviated) code:
<asp:FormView ID="FormView1" runat="server" DataKeyNames="ItemID" DataSourceID="LinqDataSource1">
<EditItemTemplate>
<asp:DropDownList ID="ddlCategory" runat="server" SelectedValue='<%# Eval("Category") %>'
DataSource="<%# GetCategories() %>" DataTextField="Text" DataValueField="Value" />
</EditItemTemplate>
<ItemTemplate>
<asp:ListView ID="lvParticipants" runat="server" DataSource='<%# Eval("Participants") %>' >
<InsertItemTemplate>
<asp:DropDownList ID="ddlCountry" runat="server" SelectedValue='<%# Eval("Country") %>'
DataSource="<%# GetCountries() %>" DataTextField="Text" DataValueField="Value" />
</InsertItemTemplate>
</asp:ListView>
<ItemTemplate>
</asp:FormView>
When the FormView is in Edit mode, ddlCategory is populated as expected by calling GetCategories(), which returns a List of categories. However, when the ListView is in Insert mode, ddlCountry is empty. I put a break point in GetCountries(), but it never gets called. If I change the name of the method, I get an error. So it recognizes the method at compile time, but does not call it at run time. I'm guessing this is an embedded binding issue of some kind, but I'm hoping someone can save me a lot of time by pointing out the solution.
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Nov 27, 2010
I can get selected values from my first page with session. In my second page i want to populate product details side by side in listview with this values. How can i do it?
here is my seconde page code behind in VB
[Code]....
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Aug 20, 2010
I'm using code similar to code mention at http://www.dutch-creatives.com/post/2009/08/11/Export-ListView-to-Excel.aspx
to export Listview to excel
My listview [Code]....
I tried to debug, understand why it is generating an extra tr td but couldn't.How Can i directly cast item into HTMLTablerow?
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Feb 19, 2010
I am trying to list 3 results per line in a list view. I have done 2 results in 1 line using the itemtemplate and alternatingitemtemplate, but how can I get 3 results to show per line?
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Dec 3, 2010
Here is a snippet of my code...
<ItemTemplate>
<asp:LinkButton
ID="lbEdit"
runat="server"
CommandName="Edit"
>Edit</asp:LinkButton>
<asp:LinkButton
ID="lbNew"
runat="server"
onclick="lbNew_Click"
CommandName="New">New</asp:LinkButton>
</ItemTemplate>
Code behind...
Protected Sub gvPunches_RowEditing(ByVal sender
As
Object,
ByVal e
As System.Web.UI.WebControls.GridViewEditEventArgs)
Handles gvPunches.RowEditing
Dim i
As
Integer = e.NewEditIndex()
Dim ddl
As DropDownList =
CType(gvPunches.Rows(i).FindControl("ddlDiv"), DropDownList)
the question I have is when i enter this procedure in the code behind, ddl is nothing. what am I doing wrong in populating the dropdown for the row I am editing?
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Oct 25, 2010
On my formview I have a drop down list that is populated with the names of the files in a certain directory. This works fine, but when the drop down list selected value is bound to the database field I get the following error :
'ImageFileDropDownList' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value
I have setup other drop down lists in the same formview populated from SqlDataSources and these all work fine. I can see perhaps why this is an issue because I have not specified a DataValueField or a DataTextField for this drop down that is populated in code (whereas I can for the SQL bound ones) because I'm not sure what these settings would be.
I need to have a "blank" option as well so that the field does not default to the first value in the list.
My code (I have stripped out some meaningless controls) :
[Code]....
My code behind populating the ddl :
[Code]....
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Dec 28, 2010
On my webform, i have one grid, 2 dropdownlist and one datepicker control.
When i select items from my both dropdown and date from datepicker control, i want to populate my grid based on above mention control selections.
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Feb 1, 2011
1. textbox (Search for staff)
2. Dropdownlist( Search for department)
3. Listbox( Populate staff name based on textbox or dropdownlist)
I am able to populate the staffs indenpendantly according to what is written in textbox or dropdownlist. Whar i wanted to do is mix the population of staffnames from textbox and dropdownlist. In other words, when i search "sandra' in textbox and select a Department A , the listbox will show all the sandra from Department A only.
[Code]....
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Nov 5, 2010
during edit mode i populate the drop down in question with data based on a value selected in another drop down also in the gridview, all works find, but the paramater is not being updated with the selected value, i think this is because i do not call any Bind in the aspx side.
<asp:TemplateField HeaderText="Build Types">
<ItemTemplate>
<asp:Label ID="lblBuildTypes runat="server" Text='<%# Bind("BuildType") %>'></asp:Label>
</ItemTemplate>
[Code]....
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Jan 3, 2011
I am drawing a blank and need some direction.I am putting together a simple website that has a single DropDownList that is DataBound to table inside of a FormView Template.What I want to happen is when the page loads, it runs the SELECT statement and displays that result(which it does, so that part works).Where I am stuck is that if I Click the DropDownList and select another item, and display the results of that selected item in the associated Databound controls.My code is below;
[Code]....
[Code]....
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Sep 6, 2010
I need to create a TemplateField column dynamically , which will contain dropdowlist controls. I've been using this
example to create my first dynamic columns and for the last column, the one that contains dropdowlist controls, I've written this class:
[Code]....
But what I don't know is, where should I populate the dropdownlist control?
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Aug 29, 2013
I read your article on ASPSnippets and everything worked great. I am having one problem and this is preventing me from moving forward. When I select the edit for a row (I only have two columns), the drop down comes back blank (no records). I have looked at the code multiple times and can't see where I made a mistake. is it possible to control the width of the drop down list? I can't tell if the column automatically adjusts because I am not returning any records.
using System;
using System.Collections.Generic;
using System.Linq;
[Code].....
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May 26, 2010
I have 3 dropdownlist controls for use with capturing birth dates. One captures the month, the next the day and the next the year. Rather than having to use 3 different xml files to populate the controls I want to be able to use just 1 xml file, but I haven't been able to work things out. I thought this would work:
<dates>
<date month="1"/>
<date month="2"/>[code]....
I thought I'd be able to assign the datatextfield of month, day or year to a given control, but this isn't working. They show up in the datatextfield dropdown in properties, but when I try to view the page in a browser I get an error that tells me the field (i.e., day) does not exist. Is there a way I can accomplish this? I am developing an ASP.NET 2.0 site in VS 2005.
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Jul 13, 2010
I have a listview that I am trying to initiate the connection string in codebehind. When I do it, I get the following error:The ConnectionString property has not been intialized.I know that I am successfully creating the connection string in codebehind because all other controls populate correctly from the dsame database.I do not get an error if I initiate the connection string in the html code.
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Jan 19, 2010
Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control. error when I place a drop down list into my instert item template of my listview, but I have the exact same control in my edit view and it works fine, any reason I am getting this error? I know what it means but why would it work in the edit mode, and not the insert mode?
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Apr 28, 2010
I have this code:
aspx
[Code]....
aspx.cs
[Code]....
Why can I not view anything in my dropdown list? It is totally blank
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Nov 20, 2010
How can I populate a dropdownlist in an InsertItemTemplate in a ListView when it depends on another dropdownlist i.e. First DropDownList has a list of continents, once this one is selected DropDownList2 should be populated with the countries of the selected continent. Mind, of course both DropDownLists are inside the same InsertItemTemplate.
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Feb 7, 2011
i have a listview linked to sqlDataSource1 and inside the listview in the itemtemplate i have a dropdownlist linked to another sqlDataSource2. in my item template I also have a button, I want to get the value that has been selected in the dropdownlist, click a button and launch a sql insert statement to insert data from the listview row and dropdowlist.selected value in another table.
how can I get data from the Dropdownlist, pass it to the "function()" in onItemCommand="function()" of my ListView instance, in order to achieve what I said before?.
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Aug 20, 2010
In my edit template I want a dropdownlist containing a list of possible customers. The list is populated from a database table containing existing customers. If the main record has customer "XYZ", then I want that customer to be the default in the dropdown. I'm using VS 2008 and C# My markup for the dropdownlist is currently:
[Code]....
The dropdownlist is populated but the problem is it shows the first customer in the list. I don't want the user to have to rechoose customer if that is not what they are changing.
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Jul 10, 2010
on SelectedIndexChanged event handling of DropDownList in ItemTemplate of ListView. I put OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" in mark up, with code behind, but only to get Compiler Error Message: BC30456: 'DropDownList1_SelectedIndexChanged' is not a member of 'ASP.webform1_aspx'. How do I make it a member? When I do not put OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" in mark up, BC30456 does not pop up, but nothing happens when dropdownlist selected item is changed.
[Code]....
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Aug 9, 2010
I have a dropdown list in ListView control in InsertItem Template. I want to bind the DropDownList when I Click on Link. I want to bind it in CodeBehind not to use Datasource. I tryed lot but not finding the DropDownList. See My Code....
<InsertItemTemplate>
<tr>
<td colspan="7">
</td>
</tr>
<tr>
<td colspan="7">
<table border="0">
<tr>
<td> </td>
<td>
Sector</td>
<td>:</td>
<td align="left">
<asp:DropDownList ID="DropDnSector" runat="server" ></asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" Display="Dynamic"
ControlToValidate="DropDnSector" SetFocusOnError="true"
ValidationGroup="vgUpdate">*
</asp:RequiredFieldValidator>
</td>
</tr>
</table>
</td>
</tr>
</InsertItemTemplate>
lnkNew is my linkbutton outside the ListView
Code Behind:
Protected Sub lnkNew_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles lnkNew.Click
Try
lvSubscription.InsertItemPosition = InsertItemPosition.LastItem
lvSubscription.EditIndex = -1
BindDropDownList()
fn_ShowSubscriptionLevel(fn_BindSubscriptionLevelEvents)
Catch ex As Exception
fn_ShowMessage(ex)
End Try
End Sub
------------------------------------------------------------------------------------------------------------------
Protected Sub BindDropDownList()
Try
Dim objSector As IEnumerable(Of SystemBuilder.SystemBuilder_Sector)
Dim objSubscriptionLevel As SystemBuilder.SystemBuilder_SubscriptionLevel
Dim DDLSectorctrl As DropDownList
objSector = CSectorDB.CSectorInstance().GetAllSector()
If (lvSubscription.InsertItemPosition = InsertItemPosition.FirstItem Or lvSubscription.InsertItemPosition = InsertItemPosition.LastItem) Then
DDLSectorctrl = CType(lvSubscription.InsertItem.FindControl("DropDnSector"), DropDownList)
If DDLSectorctrl IsNot Nothing Then
DDLSectorctrl.Items.Add(New ListItem("--Select--", "0"))
For Each ObjRec As SystemBuilder.SystemBuilder_Sector In objSector
DDLSectorctrl.Items.Add(New ListItem(ObjRec.SectorText.ToString(), ObjRec.SectorID.ToString()))
Next
End If
ElseIf (lvSubscription.EditIndex >= 0) Then
Dim DDLSectorctrl1 As DropDownList
DDLSectorctrl1 = DirectCast(lvSubscription.Items(lvSubscription.EditIndex).FindControl("DropDnSector"), DropDownList)
If DDLSectorctrl1 IsNot Nothing Then
DDLSectorctrl1.Items.Add(New ListItem("--Select--", "0"))
For Each ObjRec As SystemBuilder.SystemBuilder_Sector In objSector
DDLSectorctrl1.Items.Add(New ListItem(ObjRec.SectorText.ToString(), ObjRec.SectorID.ToString()))
Next
objSubscriptionLevel = CSubscriptionLevelsDB.CSubLvlInstance().GetSubscriptionLevelDetailsBySubscrptionID(ViewState("ID"))
If objSubscriptionLevel IsNot Nothing Then
DDLSectorctrl1.SelectedValue = objSubscriptionLevel.SubscriptionID.ToString()
End If
End If
End If
Catch ex As Exception
End Try
End Sub
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Apr 29, 2010
I have a listview with following structure :
column1 column2 column3
row1 dropdownlist1 dropdownlist3 dropdownlist5
dropdownlist2 dropdownlist4 dropdownlist6
row2 dropdownlist7 dropdownlist9 dropdownlist11
dropdownlist8 dropdownlist10 dropdownlist12
Now, what i want is that , when a user select something from any dropdownlist , a fuction should be called in which I can get column and row of that dropdownlist.
I can get the dropdownlist's id in that function along with row and column of dropdownlist.
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