Databinding - OnDataBinding Event For EditItemTemplate DropDownList?
Mar 2, 2010
I have a dropdownlist control in an edititemtemplate for a details view defined like this:
<asp:TemplateField HeaderText="Primary Use">
<EditItemTemplate>
<asp:DropDownList ID="ddlPrimaryUseEdit" runat="server" OnDataBinding="DropDownList_DataBinding"
[code]...
I have a datasource definded as a query to my database that has a column named "PrimaryUse". Sometimes there can be a value in the PrimaryUse column that isn't listed as one of the dropdownlist items and so my application crashes when trying to bind the dropdownlist's selectedvalue to that field. I'm trying to create code in the edititemtemplate's OnDataBinding event that will check if the value being returned from the datasource is a valid value listed as an item in the dropdownlist options. My problem is that I'm not sure how to get the datasources fieldvalue for that column in the behind code. Is this possible? Is so, can some one give me an example or point me in the direction on how to do this?So, in the OnDataBinding event for the edititemtemplate listed above, I would like to do the something like the following (psuedo code):
if datasource.datafieldvalue("PrimaryUse") is in dropdownlist.Items then Valid
else set dropdownlist.Selectedvalue = "Default"
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Apr 9, 2010
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int row;
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{
[[if this row = that data row]]
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}
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Aug 11, 2010
Using Visual Web Developer Express 2010 with ASP.NET 4.0.
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[code]....
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Sep 30, 2012
web in asp.net+vb code+sql database
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one dropdownlist out side grid selected value is displayed in gridview
DROPDOWNLIST OUTSIDE THE GRID
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
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DataValueField="ENTRY_COURSE">
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<asp:GridView ID="GridView1" runat="server" AllowSorting="True"
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style="font-family: Arial; font-size: small">
<FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
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[Code] ....
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Jun 15, 2010
I am handling the row databound event. I need to bind a dropdownlist which is present only in the EditItemTemplate.
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Mar 28, 2011
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[Code]....
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Oct 21, 2012
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<asp:DropDownList ID="ddlItemtList" runat="server">
<asp:ListItem Selected="True" Text="--Select Item--" Value="0" />
</asp:DropDownList>
[Code]....
I get the "Nothing" as output whever I press edit. How do I access the DropDownList withint he Listview?
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Mar 24, 2011
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[Code]....
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Aug 16, 2010
Using Visual Web Developer Express 2010 with ASP.NET 4.0.
I have a FormView and I want to set a default value from the database. I can't get it to bind to the value in the database. My FormView looks like this:
[Code]....
The EditItemTemplate does not even load when I click the edit button on my FormView control, but I don't get an error message either.
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Mar 2, 2011
I have two embedded dropdown lists in Gridview control. One gives you business channel options and the other represents products depending on the business channel selected.I am trying to use different data sources for product dropdown list depeding on what the user selected from the business channel drop down list. How could I do this. Here is my current code:
[Code]....
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Sep 3, 2010
I'm attempting to load DropDownLists from the C# codebehind as the FormView switches modes to Edit and displays the EditItemTemplate. I present the data in a FormView ItemTemplate using text boxes. When the user selects Edit, I have been attempting to load the EditItemTemplate dropdownlists by creating a dataset and binding it to the control, without success.
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I include the code below. If someone could point me to an example I would be greatful. There has to be an elegant way of accomplishing this.
[code]....
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Apr 15, 2010
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Jan 6, 2010
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Sep 24, 2010
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[code]...
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Feb 26, 2010
I've got a class that implements IListSource and returns a generic List of ListItem objects (List<ListItem>). in this list one of the ListItems has the Selected attribute set to true.On the web page I have a standard asp:dropdownlist and I set it's datasource to the getList method of my class and databind it.The problem is that the databind seems to loose the selected Item and the first item in the generic list becomes selected.
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Nov 8, 2010
I have a dynamically created dropdownlist I'm databinding. Everything seems fine until I trigger the ondatabinging to change the text of the item bound. How can I access the source data from here?
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Mar 29, 2010
I have a gridview in which I have two drop downs. One is populated with values that are static, so I have a regular sub that does that in the code behind. I tried to add code for databinding the other ddl to a datatable. I cannot get this to work. It just comes up empty. My asp code is fine, and the datatable definately has data in it - just nothing gets populated.
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[Code]....
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Mar 24, 2010
I am trying to create a Gridview in which I can update the Project Officer name in the Gridview from a DropDownList.
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[Code]....
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Feb 18, 2010
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Sep 20, 2010
I have a custom DataControlField class that works fine but when I try to use <%# Eval('???') %> with it I get an error."Databinding expressions are only supported on objects that have a DataBinding event. SharedG.ImageLinkButtonField does not have a DataBinding event."I can't get this to work,the DataControlField dosen't seem to have a DataBinding event to override or anything.I could use a normal templatefield itemtemplate etc.with eval but I don't want to rewrite this all the time.
[Code]....
want to use it:
[Code]....
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Oct 11, 2010
I have a webForm which host a gridview and a formview. The formview is used for showing/editing a record which the user Select from the gridview.
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SelectedValue='<% bind("datafield")%>'
for enabling the user easier interface. A few of the DropDownList controls need to have a list of 100 items and I want to load the items from code behind and not from the aspx.
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nothing I am getting an error like this:
[code]....
How do I load the DropDownList controls with items BEFORE the form databinding occurs.
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Aug 27, 2010
I have many controls on my form, but in particular, I have 2 dropdownlists. 1 dropdown list has 2 values, and each value controls what the second dropdownlist displays. This is an edititemtemplate and both dropdowns have the selecteditem set via '<%# Bind("fieldname") #>' on page load.
THe problem is, if I change the value of the first dropdown, it errors out because the second dropdwon has a bound value that is no longer acceptable.
Can I cancel the bind of the second control, if the the first one is changed? I would like to cancel the bind, and update the values by using a different datasource depending on the value of the first dropdown or hardcode the new values.
If Dropdown1 has a value of "A" for example Dropdown 2 Shows Values "1", "2", "3"
If Dropdown 1 has a value of "B" , Dropdown2 Shows Values "4", "5", "6".
It binds fine initially, but if I change Dropdown1 from A to B, I want Dropdown2 to show the new values, maybe with a default of "Select an Item" and not error out b/c it's attempts to bind a value of 1, 2, or 3.
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Dec 23, 2010
Bringing back to life an old post that I dont believe ever got solved: http://forums.asp.net/t/1562245.aspxThis may be an old thread .... but no answer was ever given ... and I too have a radio button list and DDL and am stuck in the EXACT same place. If I check one of the two data bound radio buttons, the DDL should repopulate with a different set of results. This works just fine EXCEPT .... the DDL cannot be databound. If I set SELECTEDVALUE of the control to a bind I get this error:Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.I have followed the advice on this page from various users, all to no avail....surely this can be done, and I assume quite simply. Anyone know the answer?
[Code]....
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Mar 31, 2011
I have a formview that has several dropdownlists in the EditItemTemplate. Some of the dropdownlists are added using placeholders. I can add and populate their listitems without any problem. But when I update the record, none of the controls can be found--even though when I look at the page source they are there. I first strated out using asp:ControlParameter in my sqldatasource updateparameters, but even referencing the control as myform$mycontrol did nothing. So then I moved to code behind on the sqldatasource.updating event (code is attached). The only controls I cannot seem to bind to the update are those added via the placeholder.
[Code]....
The item at the dim statement is not an item added using a placeholder and does not get a null reference exception (I used that to prove during debbugging that I wasn't losing my mind)--however, all the items being used to get the parameter values are getting null reference exceptions and are added via placeholders. Here is the code I'm using to set up the dropdownlists:
[Code]....
how to get the value of these controls so they can be used in my update?
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Sep 6, 2013
I have requirement to bind ASP.Net DropDownList control in EditItemTemplate of GridView.
I preferred the tutorial:
[URL]...
i have followed same steps just but difference is i have a edit imagebutton with commandname="Edit".Also dropdown needs to be binded from different table(directory) and not the table through whicch grid is binded(details).
if (e.Row.RowType == DataControlRowType.DataRow && (e.Row.RowState & DataControlRowState.Edit) == DataControlRowState.Edit && GridView1.EditIndex == e.Row.RowIndex)
{
DropDownList DStatusEdit = (DropDownList)e.Row.FindControl("DStatusEdit");
string query = "select distinct status from directory";
SqlCommand cmd = new SqlCommand(query);
DStatusEdit.DataSource = GetData(cmd);
[CODE]..
the page is running but when i click edit image button the dropdwn shows but no data in dropdown binded it is empty.
My gridview is inside update panel.
How can i achieve this?
Should dropdownlist in my case be binded inside rowcommand and how?
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