Forms Data Controls :: Determine Template In Listview's ItemDataBound?
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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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 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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Sep 10, 2010
how to do this when the checkbox in listview layout template check select all checkboxes in listview itemtemplate.I dont give 'Eval 'field to checkbox present in itemtemplate.
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Jan 14, 2010
I am simply trying to change the listView template based on a value in the listview data. I do have this displaying the information correctly. Except when I try to change the item template based on a value in the listview. My code is below ....
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Aug 11, 2010
I have an application that I would like to be able to allow the user to modify multiple characteristics of each record within a datagrid.
Most characteristics require data to be entered in a text box but some a check box would be more appropriate.
My question is does a gridview column need to have all the same item template controls? or could I read from the database the control type and dynamically alter the template control for each row as it loads?
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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 28, 2011
I am trying to determine if the user selected a checkbox for each row in a ListView after hitting a submit button. If so, I need to get the record ID and one other piece of information from that row to insert their selection into a table. I would use a GridView but the questions must be grouped by their categories with the category names displayed followed by their corresponding questions (from what I've read ListView makes this easier).
I tried the code in this forum posting
[URL]
The problem I am encountering so far is that it keeps returning null even if the Checkbox is checked.
Here is my code:
foreach (ListViewDataItem lvi in lvQuestions.Items)
{
// Find the checkbox in each row
CheckBox cb = (CheckBox)lvQuestions.FindControl("cbQuestion");
// If the checkbox is ticked
[Code]....
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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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Mar 26, 2010
I have 2 tables in my sql server and 1 ListView:
- Table Documents (DocId, Name, TemplateId)
- Table Templates (Id, Name)
My ListView:
[Code]....
Code behind:
[Code]....
I show the TemplateId but I wont to show the Name of the Template.
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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 5, 2010
I have a ListView Which displays Customer, product, price, Quantity and comments from database.The User can either edit it or Insert new items. In Edit Item template and Insert item template, i need to add a image button next to the textbox, which when clicked, will display a pop up window with list of customers or products.I have been doing it with the normal aspx page with textboxes. I use click handler to pop up the windows.i'm not able to do with listview Please help to give a solution to it.How else can i add an image icon and click it and get the values back to the textboxes?i will post what i'm doing without listview first and then the part of the relavant code of 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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Aug 25, 2010
I am trying to do this with many issues of data binding doubling the amount and not setting selectedValue on dropdownlist. I have read some posts and they help but I am missing a crucial piece. My problem is that my dropdownlist is doubling the amount of records for the dropdownlist. Instead of "YES;NO;SELECT A VALUE", I am getting "YES;NO;SELECT A VALUE;YES;NO;YES;NO". My database is correct with the UPDATE part but the rebind after update is failing horribly.
[Code]....
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Jan 31, 2011
I'm using listview with datapager.
when I'm trying to change the page if an item is in edit mode, the item with same row number in other page is opening in edit mode.
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Aug 31, 2010
Using a listview control for the first time... I need a button for each item, and of course I need to handle the click event for the buttons... upon clicking a particular button I of course need to know which item the button is associated with so the appropriate action can be taken...
In VS, I can't select the button and see my list of available events in the properties window like is normally done for controls outside of templates like this... what do I need to do?
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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 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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