Forms Data Controls :: Databound Event Is Triggered While There Is No Data In The Listview?
Jan 13, 2010
I have 2 pages (let's say one is a.aspx and the other one is b.aspx). In the b.aspx, there is a nested listview control (let's say outer listview and inner listview).Therefore, there is an event on databound for the outer listview. so basically, the event will programmatically bind the datasource for the inner listview.
Now, in a.aspx there is a button to open a new window (with unique window name) b.aspx. The very first time click on the button, a.aspx opens a new window for b.aspx without triggering the databound event. However, the second click and so on will trigger the databound event which is causing an error because there is no data yet in the outer listview.My question is, what could have possibly triggered the databound event while there is no data in the listview?
I have a checkbox in gridview. I have a onclick event in which i am checking if there are more than one record selected in the gridview, i need to select only one and de-select other checkboxes.
This is my aspx code:
[Code]....
This is my checkedchanged code:
[Code]....
I am not sure why the check change is not getting trigerred. And, is this code correct for selecting only one checkbox
have an annoying problem. i'm trying to update single items in a databound listview. but when i click the update button it gives me the cannot insert NULL value. it doesnt seem to read anything from the textboxes which i have databound from the database. even though text is clearly shown...
i have setup my update statement and parameters, it uses the Update command name and ItemUpdating event. i catch the data from the textboxes by using e.ItemIndex and use the text assigned to the parameters in a SqlCommand.
The thing i'm aiming for too is that when an item is updated it stays on the page where the item was updated, (i was using response.redirect before but it went against my aim since the whole page reloaded)
I have a condition on which i have to set the column of the datalist at run time.IT may be 2,3 or 4 at run time. How i do it. plz replay as soon as possible.
Is this possible that on the item bound event i set the html <tr><td>.
i have a check box list control that is used for showing related files to some post.
what i want to do is set the databound items "checked" to true by default
then,
if a user unchecks some item and clicks the save button. then the selectedindexchanged will fire and i will do some logic.
what i have done is.
--Set All Databound items to "checked" --
[code]....
in the end i want the item that was unchecked to be removed (all other items will remain checked). but even before that, when the user control is loaded all the files that were bounded are being deleted by the index change event.
While writing a web application Using MS Web Developer 2010 Express, I noticed a rather disconcerting behavior of the asp:DropDownlist control.When using databinding and you assign a DataValueField the selectedIndexChanged does not fire or change unless the value of the DataValueField changes no matter what the value of the DataTextField. This means that if I have several different text values(States/Provinces) with the same datavalue (US/Canada) I cannot fire an event if the text changes (the textchanged does not fire either) as long as the datavalue doesn't change (all States are US all Provinces are CA). This would seem to be a counter intuitive behavior?
last year I inherited a webapplication that seems to refuse to run on a new hosting company's servers due to a "security violation"... Our old host was bought out and now sucks...So I uploaded the code to the new company - looking forward to some sleep and found that my life was about to get more complex.. I go the good old generic security error
The biggest issue was that it didn't say where the error was.. Digging deeper (taking the code appart one block a time) the error was being triggered by the followin itemdatabound event. My host says it is because they are running under medium trust, but I am not seeing why this block should cause issues. Any help very much appreciated.
Sub dlstAlsoDish_ItemDataBound(ByVal s As Object, ByVal e As DataListItemEventArgs) Handles dlstAlsoDish.ItemDataBound If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Then Dim lngDateType As Long = e.Item.DataItem("dateType")Dim strEvent As String = "> " & e.Item.DataItem("restName") & " :: " & e.Item.DataItem("eventName") & " : " Dim lnkAlsoEvent As HyperLink = e.Item.FindControl("lnkAlsoEvent")Dim dtmStart As DateTime = e.Item.DataItem("eventSrt")Dim dtmEnd As DateTime = e.Item.DataItem("eventEnd")If lngDateType = 1 Then strEvent = strEvent & Format(dtmStart, "MMM")ElseIf lngDateType = 2 Then strEvent = strEvent & Format(dtmStart, "dd MMM") & " TO " & Format(DateAdd(DateInterval.Day, -1, dtmEnd), "dd MMM")Else strEvent = strEvent & Format(dtmStart,"dd MMM")End If lnkAlsoEvent.Text = strEvent lnkAlsoEvent.NavigateUrl = e.Item.DataItem("restURL") & "/events.aspx#e" & e.Item.DataItem("eventID")ElseIf e.Item.ItemType = ListItemType.Header Then imgBorder.ImageUrl = strImageURLDim imgBorder As Image = e.Item.FindControl("imgBorder")End If End Sub
have a listview with a list of comments. I would like to add the avatar of the person that posted the comment to each comment. To accomplish this I need to find the ListViewItem find the UserID get the avatar URL and add it to the ListView. I am sure I can do all of this in the ListView Databound event but how?
I know the question has already been posted here but we didn't get to an real solution.I have bound my ListView to an SqlDataSource and I want to write some text in a control present in the view created in the LayoutTemplate depending on some properties of the rows returned.Obviously, I'm using the ItemDataBound event to feed my items but this is not the point.
The spontaneous solution was to bind the ListView.DataBound event and access the raw datasource (a DataTable?) and do the required calculations.I inspected the Items property and, despite it was not empty, the related DataItem property was null.The only work-around I can come to is to execute the calculations in the ItemDataBound event and accumulate the result in some private fields. But it's really ugly to see and makes harder to get some of the required values.
I want to access the data that was databound to my list view when handling list view events such as:
protected void List_ItemDataBound(object sender, ListViewItemEventArgs e) or protected void List_ItemCommand(object sender, ListViewCommandEventArgs e) Inside the events, I can not access the data via somthing like Eval("ID") Currently we are using a very hacky solution: string id = e.Item.FindControl("lblID").Text; Where lblID is a hidden control that is populated with data in the aspx file using: <asp:Label ID="lblID" runat="server" Text='<%# Eval("ID") %>' />
My eyes bleed when I look at this, Is there a better way?
I have created a WPF ListView that uses GridView as its view. Below is the XAML code for my ListView
[Code]....
I am binding data to the Listview through a DataTable using the following
[Code]....
My data is being displayed properly.My question is that when I click on a particular row of data, how do I generate a click event?For Example, when I click on someones name I want a MessageBox to appread.
I have a ListView control that makes use of a DataPager. In each row of the ListView there is a text box where the user will enter some notes relevant to that particular record. Then they use the DataPager to navigate to the second page of records. If they then return back to the first page in the ListView the text they entered is gone.
Question: Is there a way (through use of a paging event or databound event maybe?) to retain the textbox values between paging events ?
I would like the user to be able navigate backward or forward and still see the text heshe has entered.
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:
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();?
What's occurring is that I'm explicitly firing an event so that the parent web page can monitor this and take appropriate actions. Thus when the user clicks on a different ListViewItem it triggers the population of associated data elsewhere on the web page.
This all works fine except for one thing: When I first load the control I'm pre-setting the first ListViewItem. Unfortunately, just setting the ListView's SelectedIndex = 0 doesn't fire the aforementioned event handler.
So I started investigating how to call "listView1_ItemCommand" but couldn't figure out how to instantiate the "e" parameter.
I'm using VS2008. When a dataset is bound to the DataSource of a ListView, SelectedIndexChanged event does not fire. If I used DataSourceID instead, it has no problem. But SelectedIndexChanging event fires for both.
why and how I can get SelectedIndexChanged event fired when DataSource is used?
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?
I have a ListView (table inside) and it's first row are some TextBoxes for filtering actions.
In the last column I have a button that calls my Search function and filters the records according to the inputs.
[Code]....
My Search function for now only displays a text inside a Label at the top of the page.
When I load the page, I'm using ListViewPesquisa.DataBind() so it shows it's EmptyDataTemplate, but when I click the button inside the event isn't called at all. If I do put some data (any data) in the ListView and it shows it's LayoutTemplate instead, the event is called properly.
I can get around this issue by moving the filter line out of the table, but I'd like to know why is that the button inside the EmptyDataTemplate doesn't work.
I have discovered something strange when using a ListView. I have a listview contained inside an uodate panel and everything works OK until I edit the editItemTemplate to use a LinkButton instead of a Button.When i use a LinkButton then the Page_Load event is fired.
