Forms Data Controls :: ListView ItemDataBound - Can't Access
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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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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Jan 15, 2011
i have simple repeater control on my page:
<asp:Repeater id="Repeater1" runat="server" DataSourceID="SqlDataSource1">
<ItemTemplate>
<asp:TextBox id="txtBox1" runat="server" Text='<%#Eval("attributename") %>'></TextBox>
<ItemTemplate>
</Repeater>
I'm bounding data to repeater control by using SqlDataSource Control
bounded data is something like this:
attributeid attributename
1 color
2 size
How can I get access to attributeid values in Repeater control's ItemDataBound event handler,
I tried to use DataBinder.GetPropertyValue(container,"attribuetid"), but I can't set container, am I doing right, or maybe I should use another approach.
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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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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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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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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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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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Jan 23, 2011
How can I access the last column in a list view whose columns are varying?
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Jan 23, 2011
How to access the HeaderText of a listView control ?
I want to fill the headerText of a listview dynamically.
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Jul 19, 2010
see the following code. How do I access the imageButton (or any other control I may happen to have) within the listView? In this case, I'd like to change the image of the imagebutton based on certain conditions in the code behind file while the listview is being populated.
[Code]....
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Mar 8, 2011
I have a search box on a web application that is to use a query I have built in Access to search through projects to find any that are related to the text entered in the search box.
The query in Access is just made up of parameters that use wildcards to search through all the fields. In Access the query works fine and returns the correct data but when I try and link this all up to a ListView in Visual Studio, the ListView just diplays the message "No data was returned"
Below is my page-behind code, hopefully you can see why it is not working but it looks like it should work to me.
[Code]....
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Jun 21, 2010
I've googled around for a couple of days now and tried different solutions posted here and there, but nothing has worked so far. Therefore I'm forced to write a new thread about this subject.
I'm working on a solution containing nested listviews. The top listview lists different projects, and in each project a nested listview lists images from that specific project using a nested sqldatasource. Inside the nested listview I want the user to be able to add new images, and i'm using the InsertItemTemplate of the nested listview. When inserting a new image, the project need to be specified, as the project is a foreign key in my image database. The problem is that in my InsertItemTemplate, "Bind" and "Eval" does not work (I believe this is by design). Therefore, when adding the new image I don't have access to the project. I'm using the ItemInserting event of the nested listview to upload the image, and the optimal solution would be to have access to the project in this event and just pass it on as a parameter.
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Jan 22, 2010
Now, I have a ListView populate products from LinQ DataSource, and a DataPager, when I load the page, it load page 1 of products(I have many pages of products), how can I acess a specific page (page number 2 for example) when I load page.
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Mar 28, 2011
I have a RadioButtonList control inside of a nested ListView control InsertTemplate. I need a way to access this control in the nestedListView_ItemInserting method.
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Mar 29, 2011
on my page, there are two listboxes,
[Code]....
Based on the selection of SchoolID in listviewSchools, the ListviewStudents will be filled with the data.
SchoolIDLabel is in the ItemTemplate of the ListviewSchools. The following works for insertitemtemplate
Dim txtTitle As TextBox = CType(ListView1.InsertItem.FindControl("txtTitle"), TextBox), but i can not Access a control inside the ItemTemplate of a listview.
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Sep 5, 2010
While running ItemDetabound upon load of a listivew, I am trying to access the text in a label of the LayoutTemplate of a different Listview. It works fine if I try access the same labels under the same names if they are in the same listview, but not if they are in a different one. It was working for a while, can't figure out what I changed, but now says that object doesn't exist.
[Code]....
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Jul 29, 2010
I am working on setting up an aspx page using access datasource in web eepression. Access Datasource is having image source information from other resources feed. I am using listview to display all the images.
The problem I am facing is that all the images are displaying in different sizes. I tried to customize Layout template by specifying the td height and width but it's not working. Is there any way to autosize the pictures in listview once page is displayed.
<LayoutTemplate>
<table runat="server">
<tr runat="server">
[code]...
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Jan 26, 2011
I have a ListView that is managing a link click event through the OnItemCommand and the list pages the data.
<asp:ListView
runat="server"
ID="lvRequests"
ItemPlaceholderID="litPlaceHolder"
OnItemCommand="lvRequests_ItemCommand"
DataSourceID="odsResults"
OnItemDataBound="lvRequests_ItemDataBound">
<LayoutTemplate>
</LayoutTemplate>
<ItemTemplate>
<tr>
<td>
<asp:Label runat="server" ID="lblSPNMatch" Visible="false" />......................
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May 24, 2010
I have a very simple datalist setup to a SQLDatasource. Displaying the data works great. But I want to replace the plain databinder container with a hyperlink instead and have that link setup to point to a detail page with a parameter. Here is my datalist setup:
[Code]....
On another page im using gridviews adn able to do what i need by using the RowDataBound of the gridview like so, how can I accomplish the same thing with a datalist?
[Code]....
I tried using the ItemDataBound and trying to modify the logic above to fit the datalist, but cant figure out how to, so I have it commented out at the moment.
[Code]....
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