Forms Data Controls :: How To Avoid Repeater Databind On ItemCommand
Apr 3, 2010
I have a repeater which does quite expensive processing when it is populated. It gets the info from a web service which is itself a federated search service and will take 15 to 20 seconds to return results.
In each repeater item/alternatingitem, i have 3 imagebuttons doing some actions (saving in session some ID's, updating some custom collections...) , the problem is when clicking on one of the buttons, the repeater will trigger the command and then databind again, which takes quite some time to process again..
The following code successfully displays a record in a FormView and sets the FormView mode to 'Edit' when the user clicks on a LinkButton within a Repeater, however the record is not Updated. If I don't change the .SelectCommand and call .DataBind, I'm able to update the first record that is displayed. Naturally that's a moot point because the idea is to be able to update the record that the user selects in the Repeater.Because of the design of the FormView and Repeater, the record *must* be updated via the FormView. Updating the record via the Repeater is not an option.
I have worked a lot with gridviews, etc, but I am relatively new to Repeaters and I have a page that uses a Repeater to display records from a SQL Database. By default the date in the SQL field is 01/01/1900. I need to format the dateSHAWSTART & dateSHAWEND in my repeater so that if the date is 01/01/1900 that the fields should be blank. Here is my VB Code Behind:
Here is the situation I have, I have a repeater inside a Usercontrol. The datasource is a IEnumerable<Investor> Exposed through a UserControl's Property. I have overridden the UserControl's databind event to set the Repeater Datasource before databinding the repeater. When it's not a postback, it databinds find and the events on the repeater item's controls fires up fine. But there is one event on repeater items (Delete Investor) which call back the DataBind of the UserControl after removing the Investor from de datasource. When this Event is called, it does all the work (deleting the investor and so on...) calls back the usercontrol's databind but when (within the usercontrol databind) the repeater is databinded again, the repeater items doesn't update (repeater items for investor not on the DataSource anymore still appears). My ItemDataBind doesn't even fire by then.
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and code bedind
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I Tried with both the Repeater Item Command and each LinkButton Event to see if it would make any difference, but none worked
All works brilliantly the first time around, the basket items are bound to Basket objects and everything is great.
However, when I receive an ItemCommand from my repeater, and update the basket contents (Note: No adding or removing is done here, just updates the quantity) then I rebind to see the latest values, and BOOM! Null reference - no Basket object in the user control Page_Load. This is despite tracing through to see that the BindItems() method is called as usual, and the Baskets are there.
Why would a button inside a Repeater not fire the Repeater's ItemCommand event? Is there a way to force it to do so? ViewState is Enabled. zn the code below, btnApprove and btnDelete are the buttons in question:
My repeater is available in a user control and I added the user control as a web part to an existing webpartzone. I could see all rows in the repeater (along with buttons). Once I click the (any) button, it loses all the rows and itemcommand never fires. I am using ASP.NET 4.0
I am building a website whereby people, before checking out of the shopping cart (and transferring to the payment iframe) can select which items from the shopping cart list to delete. The results from the shopping card are listed in a Repeater control. There is a Button in the Repeater which deletes a record from the database (used LINQ to SQL to do that.)
THe problem is that the ItemCommand event doesn't fire when i click the button. I tried 'response.write(test)' and it still would not work. It is as if the repeater cannot interact with the commands. It does render the results tho.
I am building a website whereby people, before checking out of the shopping cart (and transferring to the payment iframe) can select which items from the shopping cart list to delete. The results from the shopping card are listed in a Repeater control. There is a Button in the Repeater which deletes a record from the database (used LINQ to SQL to do that.)
The problem is that the ItemCommand event doesn't fire when i click the button. I tried response.write(test) and it still would not work.
It is as if the repeater cannot interact with the commands. It does render the results though.
switch(e.CommandName) { case "Edit": //make editTemplate div visible HtmlGenericControl divEditContact = (HtmlGenericControl)e.Item.FindControl ("divEditContact"); divEditContact.Visible = true; break; case "Update": Employee updateEmployee = new Employee { employeeName = txtName.Text: employeeEmail = txtEmail.Text: } updateEmployee = API.UpdateEmployee(updateEmployee); //display lblUpdateConfirm visible to True // so user sees this confirm messge in the newly updated ItemTemplate }
How can I access my lblUpdateConfirm and turn its Text state to visible from inside the ItemCommand, so that when the user sees the newly updated ITemTemplate, the label is showing the "Update Confirmed" message?
I've got a repeater that's used to display the output of a dynamic report that takes criteria from webcontrols on the page. Within the repeater's ItemDataBound method I'm adding controls (Linkbuttons for sorting by column values) dynamically to the header of the repeater based on values selected in a checkbox list and at this point setting the CommandArgument and CommandName properties of the linkbuttons.
The issue is that when the linkbuttons are clicked they don't fire the ItemCommand event although they are clearly being correctly created and added to the header (there is some additional code to set the cssClass, text etc. and this works as expected.) The first column header in the repeater is set in the markup and the itemcommand event fires correctly on this one only. When the other column headers are clicked the repeater rebinds as programmed, but the columns are not dynamically re-generated.
Nightmare.ascx <asp:repeater runat="server" id="rptReport" OnItemDataBound="rptResults_ItemDataBound" OnItemCommand="rptResults_ItemCommand" EnableViewState="true"> <headertemplate> <table> <tr runat="Server" id="TRDynamicHeader"> <th> <!-- This one works --> <asp:Linkbutton runat="server" CommandName="sort" commandArgument='<%# Eval("Name")%?' /> </th> <!-- additional header cells get added dynamically here --> </tr> </headertemplate> <itemTemplate> <td><%# Eval("Name")</td> ... </itemTemplate> </asp:repeater> Nightmare.ascx.cs protected void PageLoad(object sender, eventArgs e){ if (! isPostback){ setupGui();//just binds dropdowns etc. to datasources } } protected void btnRunReport_Click(...){ List<ReportLines> lstRep = GetReportLines(); rptReport.DataSource = lstRep; repReport.DataBind(); } protected void rptReport_ItemDataBound (...){ if (e.Item.ItemType == ListItemType.Header) { foreach (ListItem li in chbxListBusFuncs.Items) { if (li.Selected) { th = new HtmlTableCell(); lb = new LinkButton(); lb.CssClass = "SortColHeader"; lb.CommandArgument = li.Text.Replace(" ", ""); lb.CommandName = "sort"; lb.Text = li.Text; th.Controls.Add(lb); ((HtmlTableRow)e.Item.FindControl("TRDynamicHeader")).Cells.Add(th); } } } if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) { //Row level customisations, totals calculations etc. } } <!-- this only gets called when the 'hardcoded' linkbutton in the markup is clicked. protected void rptReport_ItemCommand(object sender, Eventargs e){ lblDebug.Text = string.Format("Well? What's Happening? -> {0}:{1}", e.CommandName, e.CommandArgument.ToString()); } (The only thing that can call the runreport routine is a single button on the page, not shown in the code snippet above.)</textarea></p> <input type='hidden' name='ID[3]' value='82079' /> <input type='hidden' name='URL[3]' value='http://forums.asp.net/t/1472917.aspx' /> <input type='hidden' name='CAT[3]' value='Forms Data Controls' /> <input type='hidden' name='BOARD[3]' value='microsoft' /> <input type='hidden' name='P_DATE[3]' value='Sep 21, 2009 02:16 AM' /> <input type='hidden' name='RANDOM[3]' value='uck4OZUSh' /> <input type='hidden' name='REPLIES[3]' value='6' /> <input type='hidden' name='USER[3]' value='aziz' /> <p><input class=subject type='text' size='90' name='SUBJECT[3]' value='Forms Data Controls :: ValidationGroup causes button not to fire ItemCommand event' /><select name='INDEXED[3]'><option value='1' selected>UPDATE</option><option value='2'>DELETE</option></select>Sep 21, 2009 02:16 AM - Replies: 6 CAT: Forms Data Controls<a target=_blank href="http://forums.asp.net/t/1472917.aspx">View</a></p> <p> <textarea rows=10 cols=100 name='POST[3]' onfocus='setSelRange(this, 0, 0)'/>
I have a page with a couple of RequiredFieldValidators, each in its own ValidationGroup. One of the RequiredFieldValidator controls is inside a Datalist and the submit button triggers the relevant DataList_ItemCommand. It works just dandy until I add the ValidationGroup to the button, at which point clicking on the button no longer fires the DataList_ItemCommand event. Here is the HTML
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Note that the ValidationGroup name is there, and it is unique. No other ValidationGroups exist with that name. As it stands, this code does NOT fire the DataList_ItemCommand event, so no update occurs. However if I remove the ValidationGroup declaration from the Button control, the event fires properly.
i have a repeater with a button in the footer template which i want to be able to update any of the items that are added (update quantites/totals/delete the item). however the 'UpdateOrderDetails' event never fires when the button is clicked. here is the code within the repeater...
<ItemTemplate> <tr> <td> <asp:CheckBox ID="chkDelete" runat="server" /> <asp:HiddenField ID="hidProduct_Key" runat="server" /> </td> <td><asp:Literal ID="ltlProduct_Name" runat="server" /></td> <td><asp:Literal ID="ltlProductOption_Size" runat="server" /></td> <td><asp:Literal ID="ltlProductOption_Code" runat="server" /></td> <td><asp:TextBox ID="txtQuantity" runat="server" /></td> <td><asp:Literal ID="ltlItemPrice" runat="server" /></td> <td><asp:Literal ID="ltlLineTotal" runat="server" /></td> </tr> </ItemTemplate> <FooterTemplate> <asp:Panel ID="pnlFooter" runat="server" Visible="False"> <tr id="trTotalExVAT" runat="server"> <td colspan="6">Total (ex VAT)</td> <td><asp:Literal ID="ltlTotalExVAT" runat="server" /></td> </tr> <tr id="trVAT" runat="server"> <td colspan="6">VAT</td> <td><asp:Literal ID="ltlVAT" runat="server" /></td> </tr> <tr> <td colspan="5"> <asp:Button ID="btnUpdate" OnClick="UpdateOrderDetails" Text="Update" runat="server" /> </td> <td>Delivery</td> <td><asp:Literal ID="ltlDelivery" runat="server" /></td> </tr> <tr> <td colspan="6">Total</td> <td><asp:Literal ID="ltlTotal" runat="server" /></td> </tr> </asp:Panel> </table> </FooterTemplate> the 'updateorderdetails' event in code behind is here Public Sub UpdateOrderDetails(ByVal s As Object, ByVal e As RepeaterCommandEventArgs) For Each objRepeaterItem As RepeaterItem In rptOrderDetails.Items Select Case objRepeaterItem.ItemType Case ListItemType.AlternatingItem, ListItemType.Item Dim chkDelete As CheckBox = objRepeaterItem.FindControl("chkDelete") Dim hidProduct_Key As HiddenField = objRepeaterItem.FindControl("hidProduct_Key") Dim txtQuantity As TextBox = objRepeaterItem.FindControl("txtQuantity") ' check for deletion or update If chkDelete.Checked Then Me.Basket.RemoveProduct(hidProduct_Key.Value) Else ' check for update If IsNumeric(txtQuantity.Text) AndAlso CInt(txtQuantity.Text) >= 0 Then Me.Basket.Products(hidProduct_Key.Value).Quantity = txtQuantity.Text End If End If End Select Next ' update order details BindOrderDetails() End Sub but this procedure is never called when the button is clicked, so wondered what i need to do to get this working </textarea></p> <input type='hidden' name='ID[5]' value='49574' /> <input type='hidden' name='URL[5]' value='http://forums.asp.net/t/1522852.aspx' /> <input type='hidden' name='CAT[5]' value='Web Forms' /> <input type='hidden' name='BOARD[5]' value='microsoft' /> <input type='hidden' name='P_DATE[5]' value='Feb 07, 2010 06:01 AM' /> <input type='hidden' name='RANDOM[5]' value='OoKSV9VFH' /> <input type='hidden' name='REPLIES[5]' value='3' /> <input type='hidden' name='USER[5]' value='aziz' /> <p><input class=subject type='text' size='90' name='SUBJECT[5]' value='Web Forms :: ItemCommand not get fire of datalist in IE' /><select name='INDEXED[5]'><option value='1' selected>UPDATE</option><option value='2'>DELETE</option></select>Feb 07, 2010 06:01 AM - Replies: 3 CAT: Web Forms<a target=_blank href="http://forums.asp.net/t/1522852.aspx">View</a></p> <p> <textarea rows=10 cols=100 name='POST[5]' onfocus='setSelRange(this, 0, 0)'/>
I have imagebutton inside datalist.....the problem is that onclick event of serverside not get executed for only IE ..but its work fine for mozzila....i m not getting what wrong in this code.
I'm having trouble managing how to call upon databind from clicking on a row over an already populated repeater that will populate data regarding the row clicked TO another repeater on the same page.
I've succeeded doing that with postback, calling a jquery click event of that row, taking the data of the specific row and passing it onto a "Querystring" and after postpack, it will be pushed into a Session which the ObjectDataSource of the secondary repeater will recognize and populate the data tables accordingly.
The problem is, I must do it without a postback or in other words purely on client side.
How do I disable the DataGrid controls in ItemCommand using VB.For Example I have dropdownlist bound in my DataGrid. Now I want to Disable this control in Datagrid_ItemCommand.I tried like this
I have a checkbox inside the item template of a datalist, dtlLate. I want to detect the checkbox change and execute a stored procedure. When I click the checkbox a postback does occur but the dtl Late itemcommand doesn't fire. I am not rebinding the datalist on postback. I have tried with viewstate enabled and disabled. I have used Bold text for the dtlLate in the content page and in the codebehind to make it easy to find.
I have a datalist in my page that has a LinkButton at the beginning of each row that, when clicked, fires the Itemcommand ("select"). There is no issue with this as it works as it should:
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But I also thought it would be good if the user could simply click anywhere in the datalist to expand the item and show based on the SelectedItemTemplate. So, I thought, the cleanest would be to add a function in the code behind that adds a click event to the Panel "panItem" that clicks the above mentioned LinkButton like this (fires in Page_PreRender):
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Here is where the problem comes in. This works great in IE but not FF3.6 (havent tested it with older version of FF). In FF, I get a JS error saying "dlMapDB_ctl00_btnItemFigNumber is not defined" for the first row, "...ctl01..." for the second row, etc. So the IDs are correct based on the markup (which makes sense since it works in IE).
I have a details view to insert some data. I want to validate this data myself. use the ItemCommand to trap the insert command. If the data entered does not match what I need, I want to somehow stop the insert procedure at this point.
Events an ItemCommand event that uses the DetailsViewCommandEventArgs event arg class which has a CommandName property.
My questions are...
What are the possible values (e.g. "Select", "Insert", etc.) for this CommandName property when operating a standard, uncustomized DetailsView control?
The "ing" events are currently being intercepted so that if the user doesn't have permission I set the e.Cancel = true and the "ed" events have redirects to send the user back to a list page that shows the items they just added/updated/deleted. However, I am not able to capture the Cancel button on the DetailsView control since there's no event for it. What I want is to redirect the user back to the list page if they click on Cancel as well.
I've got a GridView control with LinkButtons in different cells. Currently when someone clicks a link, it fires the ItemCommand passing the CommandName and the ID of the item the link is bound to. That all works fine. I need to modify it now to not use links anymore. It now needs to show a popup balloon with a link (styled to look like a button) and when the link is clicked, I want it to do the exact same thing. I'm sure there are several ways of doing this, but for time's and consistency's sake, I'm copying the method used from another page we have that is already doing this. It has a hidden DIV on the page with the link in it. When you hover over a link, javascript repositions the div and makes it visible.
So what I need to do is pass my CommandName and item ID to the javascript so that it can trigger the postback when they click that single link. I know this is not the only way to get to the end result, but what I want to do if possible, is still fire the GridView's ItemCommand and set he DataListCommandEventArgs' CommandName and CommandArgument properties. Can someone explain how, under normal circumstances, clicking the LinkButton in the GridView fires the ItemCommand? I know that the LinkButton's click event is forwarded to the GridView but what gets sent from the client side that let's the server know the link was clicked?
I am upgrading a website project from asp.net 3.5 to 4.0. I went through the upgrade wizard and site compiled and built fine. But immediately I have encountetred a problem.I have 3 nested ListViews all using the ItemCommand event. Under 4.0 once the ItemCommand event has fired on the inner ListView it then bubbles up and fires on the parent and finally the grandparent.This is a change in behaviour from 3.5 where only the inner ListView event fires. While I can code round this I am worried about these subtly changes between the two versions.
I'm building a navigationmenu and for that I create repeatercontrol dynamicly from codebehind. This works fine with the exception that the ItemCommand event is not firing. The ItemDataBound-event I bind to the repeater-control is working fine. Can somehow tell me what I'm doing from.
