Set Dropdownlist Value In Listview On Itemdatabound?
Apr 1, 2010
i have dropdownlist of year which is coming dynamically.i have filled the dropdownlist using object datasource.on inserting in the listview control it is working fine. but when i click on edit button that dropdownlist value should be set which is coming from the database. e.g. if i have a row which contains Year=2006 and month="Jan"then on click on edit button these dropdown list should be fill up. i have written the code in ItemDataBound to set the value of the dropdownlilst.but when i use findcontrol its taking null so object reference error is coming.
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Similar Messages:
Feb 18, 2011
The ItemDataBound event of the ASP.NET ListView seems to only deal with the visible page as determined by the DataPager. How would I be able to utilize data binding on all pages worth of the ListView? This is regarding using ItemDataBound to check checkboxes.
protected void lvCFR_ItemDataBound(object sender, ListViewItemEventArgs e)
{
ListView lv = (ListView)sender;
ListViewDataItem lvi = (ListViewDataItem)e.Item;
if (lvi.ItemType == ListViewItemType.DataItem)
{
CheckBox cb = (CheckBox)lvi.FindControl("cb1");
DropDownList ddl = (DropDownList)lvi.FindControl("ddl1");
if (ddl != null)
ddl.Enabled = false;
if (cb != null && ddl != null)
{
int ID = Convert.ToInt32(lv.DataKeys[lvi.DisplayIndex].Value);
foreach (KeyValuePair<int, string> kv in CFRIDs)
if (kv.Key == ID)
{
cb.Checked = true;
ddl.Enabled = true;
ddl.SelectedValue = kv.Value;
break;
}
}
}
}
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Jul 13, 2010
i am getting the following error during itemdataboundevent of a listview. Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.Compiler Error Message: CS0030: Cannot convert type 'System.Web.UI.WebControls.ListViewItemType' to 'System.Data.DataRowView'
Source Error:
Line 91: CheckBox chk = (CheckBox)e.Item.FindControl("chkFocusArea");
Line 92:
Line 93: System.Data.DataRowView rowView = (System.Data.DataRowView)e.Item.ItemType;
Line 94:
Line 95: }
my code behind for itembound event is
protected void lvFocusArea_ItemDataBound(object sender, ListViewItemEventArgs e)
{
if (e.Item.ItemType == ListViewItemType.DataItem)
{
CheckBox chk = (CheckBox)e.Item.FindControl("chkFocusArea");
System.Data.DataRowView rowView = (System.Data.DataRowView)e.Item.ItemType;
}
}
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Apr 4, 2010
I previously had a datalist bound to an objectDataSource. Within the ItemDataBound event, i could quite happily access the current bound row as follows:
[Code]....
where ASPNETDB was the database and tblJobs the tableadapter. I could then reference the tblJobs items as job.JobId and job.StartDate etc. Upon chainging the datalist to a listview, I can't seem to find any way of accessing the same data. I've tried ListViewItem and ListViewDataItem, is this the right method or am i missing something?
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Sep 15, 2010
I am using the ItemDataBound event of a ListView to attach data for the different kind of templates I am using. Well, actually, want to use - I have not yet figured out how to know which template is coming in in the ItemDataBound event. I want to figure out if it is the edititemtemplate, insertitemplate, itemtemplate, etc. All these templates have different controls (edit and insert are the same though) and I need to set the controls contained in them.
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Sep 13, 2010
I am using a listview to which I want to bind the MembershipUserCollection which you get from GetAllUsers(). I don't want to use reflection, I want to assign it in the ItemDataBound event of my listview. I've done this before, but with datatables. The code will be something like DataRow dr = (e.item.DataItem as DataRowView).Row. You can then access specific columns with
dr["ColumnNamehere"].ToString().
But how do you do this with MembershipUserCollection?
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Jan 12, 2011
I'm presenting a list of products within a ListView. Each product can have associated "Options" (Size, Colour etc), but may have none. For each product that gets added, I need to render a dropdownlist for each of its options. E.g. A "Colour" dropdown might have "Black", "White", "Red" etc. I need to generate these controls dynamically, as they are defined by the data itself.
So far, so good. The dropdowns are rendered, and everything "looks" good. The trouble is, I can't work out how to actually get it to work. .Net is complaining about "EnableEventValidation", and ViewState won't work as I've added the controls late in the page's life cycle. As these controls are dynamic, I don't know how to pick up the selected values, and persist them on a post back! When the user clicks on the "Add to basket" option for the product, I need to determine which options the user has selected, and add them to the basket.
Am I missing something here? Is there an easier way of achieving this? I kind-of feel like I'm in a "chicken and egg" situation here. I can't create the controls until the data is loaded (in the ItemDataBound event), but that too late for ViewState. Is there a generally accepted best approach for achieving this sort of thing in ASP/Net?
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Apr 16, 2010
I stumbled into a problem which is that FindControl will only return a control in the ListView after the listview has been databound. Here is the code which is not working, and I'm getting the "Object reference not set to an instance of an object error" when I try to add the attribute to the control:
[Code]....
Any ideas on how I can elegantly fix this?
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Oct 25, 2010
System.InvalidCastException was unhandled by user code
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Apr 20, 2010
I am populating an asp.net listview control from my page_load event. Unfortunately, due to my projects requirements, I have to use a third party control within my listviews ItemTemplate that needs to have database values written to its attributes before my listview control is bound, if this is not the case my control flags a null reference exception error. From some investigation into the listview control, it seems that the only way to do this is through my listviews ItemDataBound event as my thrid party control will hold different value depending on each row.was wondering if it's at all possible to force my listviews ItemDataBound event to fire before I call mylistview.databind();?
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Oct 25, 2010
using a listView control... I'm trying to use the ItemDataBound event to map a field's native value to a more 'friendly' name... so far I have the code to access the underlying data so the decision can be made for the actual mapping, but I don't know how to actually change the data displayed?
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Feb 17, 2011
I am attaching an image to a listview from code behind, the image depends on a value from the database and there are 5 different images.It sometimes works fine and then will randomly come up with an error, when nothing has changed, the error is:[Code]....
It doesn't seem to make sense to me because ImageUrl IS a member of image. Here is my code:
[Code]....
And code behind: [Code]....
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Jan 18, 2011
I have created a ListView that has editing enabled, the wizard generated the table with the use of textboxes but i require the use of dropdown lists for some options. I have created the dropdown list
<asp:DropDownList ID="ActionStatusTextBox" runat="server">
<asp:ListItem Value="Ongoing">Ongoing</asp:ListItem>
<asp:ListItem Value="Open">Open</asp:ListItem>
<asp:ListItem Value="Closed">Closed</asp:ListItem>
</asp:DropDownList>
The drop down list generates successfully but doesn't submit and enter itself in the databse.
<%# Bind("ActionStatus") %>'
The above snippet needs to used somewhere in order to bind the data but which parameter does it need attaching to to pass the data?
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Jul 11, 2010
I have various difficulties handling dropdownlist in listview itemtemplate.Hopefully, resolving this example will help me understand how to make things work.I need to do several things upon DropDownList1_SelectedIndexChanged.(1) Fetch row index of listview then set the row as listview selected, or vice versa, in which dropdownlist was changed.(2) Fetch text of namelabel in that selected listview row.(3) Fetch selected text of dropdownlist in that selected listview row.
[Code]....
At the moment...(1) Label1.Text = ListView1.SelectedIndex always shows '-1' regardless in which row dropdownlist is selected/changed.(2) Label2.Text = NL.Text pops 'Object reference not set to an instance of an object'.(3) Label3.Text = DDL1.SelectedItem.Text pops 'Object reference not set to an instance of an object'.
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Sep 24, 2010
Basically when editing an item, I want to bind its ProviderId value to the DropDownList's select value.DropDownList is getting its list of values from other entity entity_List as you can see.
Markup:
<asp:ListView ID="aList" runat="server" OnDataBound="aList_OnDataBound" DataKeyNames="ListServID" DataSourceID="ListServCon" InsertItemPosition="LastItem" selectedvalue='<%# Bind("ProviderID") %>' >
[code]...
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Jul 6, 2010
i want to display two columns of a table in a single dropdownlist or a listview.
india ind
pakistan pak
australia aus
these two columns should display at same control which comes from same table...
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Sep 15, 2010
I want to filter the table in my Listview (mvc2) using values from a dropdownlist shown at the top of the page. The values in the list are hard coded. Next to the dropdownlist I got a "Filter" button that calls the filter method on the controller / How can I pass the selected value from the list to the controller? for now I'm using a classic asp:dropdownlist
[Code]....
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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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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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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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