DataBound Event Is Not Available For DataList Control?
Mar 16, 2011
I am working on a project in ASP.Net, in which I am using DataList control to list the candidate data. As we know, DataBoud event is available for gridview control, which is raises after databound. In DataList control no such event is available. Yes, ItemDataBound event is there which is arises on every Item bound. Let us assume, that I want the number of items are listed in datalist, after completing the data bound of datalist.
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Similar Messages:
Oct 5, 2010
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>.
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May 10, 2010
i have a FormView, and i already have a Label control that gets the value of theselected propery inside the FormView, so each time the FormView displays data, i have a Label control that displays individual values, according to the value of the FormView, here is the code:
[code]....
What i would like to do is to know how i could add a DataList instead of a Label, and then each time the FormView databinds an item, to show the value of the DataList How would i go about doing that?
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Feb 24, 2011
I have DataList control and I want to assign to it's edititemtemplate some User Control. The problem is I can't find when I should databound UserControl to data, as my UserControl doesn't have static look (it renders different depending on some property values and datasource).
I was try to simply set my user control in edititemtemplate
<EditItemTemplate>
<uc:MyUserControl id="myUserControl1" runat="server" />
</EditItemTemplate>
and then bind it to data in ItemDataBound event handler, but it remains empty
if(e.Item.ItemType == ListItemType.EditItem)
{
var p = (Pair)DataBinder.GetPropertyValue(e.Item.DataItem, "Key");
((AnnouncementUserControl) e.Item.FindControl("userControl1")).RepeaterDataSource =
_templateWorker.ReturnTemplateByAnnouncementId(Convert.ToInt32(p.First), true);
}
how can I databound my control, or another approach which will make me avoid this problem?
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Dec 20, 2010
Take for example a DetailsView control with an ObjectDataSource as its datasource.Normally in the DetailsView.ItemUpdated event I would grab a reference to the details view by casting the sender:
DetailsView dv = (DetailsView)sender;
In certain situations it becomes necessary to handle the event inside the ObjectDataSource.ItemUpdated event. In this case sender is now of type ObjectDataSource. What I want to be able to do is write clean code that isnt hardcoded like
Label label1 = DetailsView1.FindControl("Label1");
I looked over the documentation and also did some searches but couldnt find how I would write some code like the following:
protected void ObjectDataSource1_Inserted(object sender, ObjectDataSourceStatusEventArgs e)
{
ObjectDataSource ods = (ObjectDataSource)sender;
DetailsView dv = (DetailsView)ods.SOMETHING_HERE;
}
what I should be putting in the SOMETHING_HERE in the snippet above?
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Dec 7, 2010
I want to render something like this (with ASP.Net Controls in the codebehind):
<ul>
<li class="first"><h1>This is a caption</h1></li>
<li><a href="#" title="" target="_self">Foo</a></li>
<li><a href="#" title="" target="_self">Foo1</a></li>
<li><a href="#" title="" target="_self">Foo2</a></li>
<li><a href="#" title="" target="_self">Foo3</a></li>
<li><a href="#" title="" target="_self">Foo4</a></li>
</ul>
<ul>
<li class="first"><h1>This is a another caption</h1></li>
<li><a href="#" title="" target="_self">Foo5</a></li>
<li><a href="#" title="" target="_self">Foo6</a></li>
<li><a href="#" title="" target="_self">Foo7</a></li>
<li><a href="#" title="" target="_self">Foo8</a></li>
<li><a href="#" title="" target="_self">Foo9</a></li>
<li><a href="#" title="" target="_self">Foo10</a></li>
<li><a href="#" title="" target="_self">Foo11</a></li>
</ul>
The amount of li elements that will be rendered into each ul is determined at runtime. Each link in a li belongs to into a specific ul (the one containing a specific caption. Imagine this as a kind of a treeview with nodes and subnodes) During the bind Event I need access to an ASP:HyperLink that will be rendered into the a-element. Which databound ASP.Net control should I pick for this? Looks like a repeater in a repeater, which should make the databinding process ugly. I'm thinking about creating this HTML-Output with StringWriters myself.
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Mar 13, 2011
I am using datalist control on Default.aspx. In that datalist control I have ASP Link Button and the data is fetched from the Database while loading the control. Now, When my user clicks on that particular Link Button, the data associated with it should be shown on the next page. Which event shall I use? How do i select the values that I would show on the next page?
[Code]....
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Sep 20, 2015
How to fire check changed event in Data-list control?
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Dec 23, 2010
I have a datalist that loops thru cart items. Within the datalist template I call a user control that has a small form that gets repeated for each item. When this control is called outside of the datalist, the form submits fine, but when called within the datalist the button has no event action. I've tried adding an event handler to ItemDataBound of the datalist, but still no event action. How can I get my form to submit?
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Jun 2, 2010
I have a DataList in my page which it has been bound to Database.
I want to open a popup at mouseover of a databound label inside the DataList.
how can open this popup using jQuery.
I do exactly know what to do with AjaxControlToolkit and Obout.
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Feb 3, 2010
I have a LinkButton that is databound to a description. Sometimes the descriptions are very long and unorganized so I would like it to show for example 75 characters and then append a '...' to the end of any description greater than 75 characters. I found this snippet which pretty much is exactly what I want to do :
from [URL]
[Code]....
I just cant figure out how to do this for the LinkButton in my ItemTemplate in the DataList.
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Aug 10, 2010
I was just wondering what is the best way to fetch gridview data using row databound event of gridview. I am previously used to Eval but read its not recommended as it uses reflection.
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Mar 16, 2010
I just started working with LinqDataSources and I was wondering how you retrieve values in a FormView DataBound Event.
With an ObjectDataSource I believe you can grab them like:
[Code]....
Is there a similar way to acheive this with a LinqDataSource?
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Apr 23, 2010
I have FormView in my page markup:
[code].....
In theory, I'm able to find control on FormView after it being data bound. But I'm not. Why?
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Jan 19, 2011
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?
protected
void ListViewViewComments_DataBound(object sender,
EventArgs e)
{
try
[code]...
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Sep 22, 2010
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.
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Nov 7, 2010
How can i do the following:
I already have an ArrayList populated from an Oracle table using SQL Select statement.
[Code]....
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Oct 7, 2010
Currently struggling with a problem that I've encountered variations on in the past. At the moment a worthwhile solution escapes me, but it seems such an obvious issue that I can't help wondering whether or not there's a "best practice" approach I should adopt.Without code, here's the issues in a nutshell:
page has databound control (a repeater) which isn't populated until user inputs data and clicks a button.Repeater item template contains a buttonUser clicks button, page posts back. On load, the repeater is actually empty so event is never handled because the originating control no longer existsGo back to the beginning of wretched cycle I've confirmed that this is the problem because if you provide the repeater with some static data on page load, everything works fine. But of course that's no use because it has to be populated dynamically.Is there a commonly approved way round this headache? I can store the data in session and re-use it on page load, but it seems terribly clumsy.
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Feb 11, 2011
I have a DetailsView control bound to an ObjectDataSource within a User Control (.ascx). It appears that the DetailsView.OnDataBound event is being fired on every page load or postback.
I do not see this behavior with a similiar DetailsView directly placed on an aspx page.
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Jul 22, 2010
I wanted to get the total row count in a GridView's databound event handler, so I tried the following:
protected void grid_DataBound(object sender, EventArgs e)
{
GridView grid = (GridView)sender;
DataSet data = grid.DataSource as DataSet;
if (data == null)
return;
int totalRows = data.Tables[0].Rows.Count;
}
The problem is that the grid.DataSource property is null. The DataSourceID property is not null, so does that mean that I can't access the DataSource object in the DataBound event handler unless I assign the DataSource property directly?
Edit1: Here is the code in my GridHelper class for adding rowcount to the BottomPagerRow. I would like to get rid of the requirement to pass in the ObjectDataSource, but can't because I need to use the Selected event to get total row count. Hence the reason for the question. I also think this might be better in a custom control where I can access ViewState, and/or create child controls during the Init event (I still have a problem to resolve with the way the pager renders with an extra cell), but then I'd still have the problem of how to get to the total row count when the DataSource itself doesn't appear to be available in any GridView events.
Edit 2: Not really relevant to the specific problem, but I resolved the problem I was having with the pager rendering so i've updated the code posted. I found the trick here: [URL]
#region Fields
private int totalRows = -1;
#endregion
#region Constructors
/// <summary>
/// Initializes a new instance of the <see cref="GridHelper"/> class.
/// Adds EventHandlers to the GridView to display results from the ObjectDataSource in the footer.
/// Marked as obsolete because AddResultsToFooter method provides a static access to the same functionality
/// An instance of GridHelper is required by the passed in GridView to store the totalRows value between the two event handlers
/// </summary>
/// <param name="grid">The grid.</param>
/// <param name="source">The ObjectDataSource linked to the GridView.</param>
[Obsolete("Use AddResultsToFooter instead.")]
[EditorBrowsable(EditorBrowsableState.Never)]
public GridHelper(GridView grid, ObjectDataSource source)
{
source.Selected += source_Selected;
grid.PreRender += grid_PreRender;
}
#endregion
#region Event Handlers
private void grid_PreRender(object sender, EventArgs e)
{
GridView grid = (GridView)sender;
if (grid.HeaderRow != null)
grid.HeaderRow.TableSection = TableRowSection.TableHeader;
//Add a cell to the bottom pager row to display the total results
if (grid.BottomPagerRow == null || !grid.BottomPagerRow.Visible)
return;
//Get the control used to render the pager
//http://michaelmerrell.com/2010/01/dynamically-modifying-the-asp-net-gridview-paging-control/
Table tblPager = grid.BottomPagerRow.Cells[0].Controls[0] as Table;
if (tblPager == null)
return;
if (totalRows < 0)
{
//The DataSource has not been refreshed so get totalRows from round trip to client
addResultsToPagerTable(tblPager, grid.Attributes["results"]);
return;
}
int firstRow = grid.PageIndex * grid.PageSize + 1;
int lastRow = firstRow + grid.Rows.Count - 1;
string results;
if (totalRows <= grid.PageSize)
results = string.Format("<span class='grid-pager'>{0} Results</span>", totalRows);
else
results = string.Format("Results <b>{0}</b> to <b>{1}</b> of <b>{2}</b>", firstRow, lastRow, totalRows);
addResultsToPagerTable(tblPager, results);
//Need to store the information somewhere that is persisted via ViewState, and we don't have access to ViewState here
grid.Attributes.Add("results", results);
}
/// <summary>
/// Handles the Selected event of the source control. Gets the total rows, since it is not possible to access them from the GridView.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.Web.UI.WebControls.ObjectDataSourceStatusEventArgs"/> instance containing the event data.</param>
private void source_Selected(object sender, ObjectDataSourceStatusEventArgs e)
{
if (e.ReturnValue is DataView)
totalRows = ((DataView)e.ReturnValue).Count;
else if (e.ReturnValue is EntitySet)
totalRows = ((EntitySet)e.ReturnValue).Count;
}
#endregion
#region Private Methods
private static void addResultsToPagerTable(Table tblPager, string results)
{
//http://michaelmerrell.com/2010/01/dynamically-modifying-the-asp-net-gridview-paging-control/
//Get a handle to the original pager row
TableRow pagesTableRow = tblPager.Rows[0];
//Add enough cells to make the pager row bigger than the label we're adding
while (pagesTableRow.Cells.Count < 10)
pagesTableRow.Cells.Add(new TableCell { BorderStyle = BorderStyle.None });
//Add a new cell in a new row to the table
TableRow newTableRow = new TableRow();
newTableRow.Cells.AddAt(0, new TableCell
{
Text = results,
BorderStyle = BorderStyle.None,
ColumnSpan = pagesTableRow.Cells.Count
});
tblPager.Rows.AddAt(0, newTableRow);
}
#endregion
#region Public Methods
/// <summary>
/// Adds EventHandlers to the GridView to display results from the ObjectDataSource in the footer.
/// </summary>
/// <param name="grid">The GridView.</param>
/// <param name="source">The ObjectDataSource linked to the GridView.</param>
public static void AddResultsToFooter(GridView grid, ObjectDataSource source)
{
if (grid == null)
throw new ArgumentNullException("grid", "grid is null.");
if (source == null)
throw new ArgumentNullException("source", "source is null.");
new GridHelper(grid, source);
}
#endregion
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Jul 12, 2010
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.
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Jun 28, 2010
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
System.Security.CodeAccessSecurityEngine.ThrowSecurityException(Assembly asm, PermissionSet granted, PermissionSet refused, RuntimeMethodHandle rmh, SecurityAction action, Object
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
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Dec 4, 2010
how do I use the datalist "DL_Pro_Result" to find the child datalist "DL_Gro_Result" in C#?
For example in the following code, dlii value is null, even though dli != null.
DataList dli = (DataList)Page.FindControl("DL_Pro_Result");
DataList dlii = (DataList)dli.FindControl("DL_Gro_Result");
<div id="ProList">
<asp:DataList ID="DL_Pro_Result" runat="server">
<HeaderTemplate>
<table id="T_Pro_Result_Header" runat="server">
<tr>
<td>
<asp:Label ID="L_Pro_Result_Header" runat="server"></asp:Label>
</td>
</tr>
</table>
</HeaderTemplate>
<ItemTemplate>
<table id="T_Pro_Result_Item" class="table" runat="server">
<tr>
<td>
<asp:Label ID="L_Pro_Result_Item" runat="server"></asp:Label>
<asp:Button ID="B_Pro_Result_Item_1" OnClick="B_Pro_Result_Item_1_Click"/>
</td>
</tr>
<tr>
<td>
<asp:DataList ID="DL_Gro_Result" runat="server">
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Aug 31, 2010
Depending on the case, I'd like to hide a databound control in a page. But no matter what I try, it seems like the control will try biding no matter what. I've tried setting Visible="false", but it would still try to bind. I've tried putting the control into a placeholder and then hide the placeholder, it will try to bind anyway. I've also tried putting it into a MultiView, same thing. You would think that in a wizard interface using a MultiView you would not want the controls in the next steps of the wizard to bind, but no. It binds anyway...
The only way I've found is to unset and set the DataSourceID property which seems to prevent binding.
Is this really the only option?
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Feb 25, 2010
I have a control that inherits CompositeDataBoundControl. Based on the values of the bound data, I create som dynamic controls. In order to preserve state, I need to recreate the control tree on every request(from CreateChildControls):
[code]....
The problem is that on postback the PaymentMethod object is null, so I have no method of knowing what kind of control to recreate. That means that the control state is ruined. If I hardcode the type of payment control to make, it works as expected:
UserControl userCtrl = (UserControl)Page.LoadControl("~/WAF/View/VisitControls/Shop/CreditCardForm.ascx");
dataContainer.Controls.Add(userCtrl);
userCtrl.ID = "CreditCardForm";
how I can find out what payment method is used, so that I can create the correct control on postback?
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