Link Button as trigger not firing

So I have a link button that is created here...

 LinkButton hide =new LinkButton(); hide.Text ="(hide)"; hide.Click +=new EventHandler(this.hide_Click); hide.ID ="hide" + deviceID;

which is later added to a table cell which is added to a table row which is added to a table. This table is what my function returns (the functions basically builds the table)

From where the function is called I have this code to create a trigger using the linkbutton hide, then add that trigger to the update panel that i am putting the newley created table in...

 AsyncPostBackTrigger trig =new AsyncPostBackTrigger(); ((UpdatePanel)tempTable.Parent.Parent).ContentTemplateContainer.Controls.Add(childTable); trig.ControlID = childTable.Rows[0].Cells[1].Controls[1].UniqueID; trig.EventName ="Click"; ((UpdatePanel)childTable.Parent.Parent).Triggers.Add(trig);

I have tried making the controlID both the unique ID and just the ID and neither work. I know that my just for testing my hide_click function is simple...

private void hide_Click(object sender, EventArgs e) { txtOutput.Text ="IT WORKED!"; }

I know the hide_Click function works because i attached it to other buttons in other tables and it executes fine.

Does anyone know if I am doing something wrong because I cannot seem to figure this out.

Thanks

Hi,

what issue are you experiencing? A full postback instead of an async postback? Or the "IT WORKED!" text isn't displayed? In this case, did you put the Label inside an UpdatePanel?

There is no postback at all. The txtOuput is inside an update panel. It works fine when triggered from other buttons that were added to my page the same way I am adding my link button, but something is acting up. Im not sure if there is a problem with where I am adding the trigger so I am going to try defining the trigger at the same place in code as where I am defining the link button to see if that helps, but i doubt that will change anything.

Ok this is really starting to mess with my head. I have noticed now that when i click on my button, the textbox txtOutput refreshes, but still displays the text that was already there, instead of getting the text from the hide_Click function. This is weird though because when I point other buttons to my hide_Click function, they fire it perfectly and the text box updates. I am confussed

Hi,

Please refer to this:

http://ajax.asp.net/docs/mref/T_System_Web_UI_AsyncPostBackTrigger.aspx

Programmatically adding AsyncPostBackTrigger controls is not supported. Use the RegisterAsyncPostBackControl(Control) method of the ScriptManager control to programmatically register a postback control, and then call the Update() method of the UpdatePanel when the control posts back.

Please try as the above documentation described. If still fails, please post a self-sufficient repro.

great thanks, ill take a look. I was all excited because I was able to programatically add asyncpostback trigers to some update panels, I did this at the time the panels were being created and it worked fine, I guess there are some situations where it just doesnt work though.

so it turns out the trigger is working fine, the only problem is that my hide_Click event isnt being fired. I have had this problem before where having certain settings enabled for different controls cause the controls .click event not to work properly, now its just a matter of finding out what is causing this problem

link buttons in user control not recognised by updatePanel

Hello...

I have a usercontol that has some linkbuttons.....and an updatePanel...i put the linkbutton ID's in the Trigger section of the updatePanel, but I'm getting an error that the updatePanel does not recognise the button ID's I have passed in...

how do I fix this? thanks

Hi,

Update Panel is not gonna recognize those link buttons because they are inside of usercontrol. You need to create user control event for each link button event. For example,

CustomControl.ascx

<%@. Control Language="C#" AutoEventWireup="true" CodeFile="CustomControl.ascx.cs" Inherits="CustomControl" %>
<asp:LinkButton ID="lnkTest" runat="server" OnClick="lnkTest_Click">Test Button</asp:LinkButton

CustomControl.ascx.cs

public partial class CustomControl : System.Web.UI.UserControl
{
public delegate void TestHandler(object sender, EventArgs e);
public event TestHandler LinkClicked;

protected void Page_Load(object sender, EventArgs e)
{

}
protected void lnkTest_Click(object sender, EventArgs e)
{
if (LinkClicked != null)
LinkClicked(this, new EventArgs());
}
}

test.aspx

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="CustomControl1" EventName="DoYourBussiness" />
</Triggers>
<ContentTemplate>
<uc1:CustomControl ID="CustomControl1" runat="server" OnLinkClicked="DoYourBussiness" />
</ContentTemplate>
</asp:UpdatePanel

Hi,

thanks for this, how about for normal hyperlinks?... (instead of linkButons)... can something similar be done?

thanks

Hi,

Normal hyperlinks do not have OnClick event. LinkButton looks the same as HyperLink, but has OnClick event.

LinkButton inside a repeater as a trigger

 I have been searching all over for an answer but have yet to find anything. 
 I have a repeater that I use to display a letter paging system.  It looks something like this   
 
<asp:Repeater ID="rpt_Letters" runat="server"> <ItemTemplate> <asp:LinkButton ID="lbtn_Letter" CausesValidation="false" CommandName="Filter" CommandArgument='<%# Eval("Letter") %>' runat="server" style="padding-left:7px; padding-top: 10px;" ToolTip='<%# Eval("Letter") %>'><%# Eval("Letter") %></asp:LinkButton> </ItemTemplate> </asp:Repeater>
 
Once a letter is clicked I want to update the information in a GridView.
I have the GridView in an update panel, but I can't find away to set my Letter Paging as a trigger.
 
Thank You!
 
 

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Add your repeater control to an UpdatePanel as follows:<asp:UpdatePanelID="PagingPanel"UpdateMode="Conditional"runat="server"><ContentTemplate><asp:RepeaterId="">...</asp:Repeater>and put your gridview control in another UpdatePanel like this:<asp:UpdatePanelID="OrderDetailsPanel"UpdateMode="Always"runat="server"><ContentTemplate><asp:gridview/>And then add handler for OnCommand event of the linkbutton (lbtn_Letter) where you can filter rows like this:protected void Letter_OnCommand(object sender, CommandEventArguments e) { SqlDataSource2.SelectParameters["OrderID"].DefaultValue = e.CommandArgument ;SqlDataSource2.DataBind();}where SqlDataSource2 is bound to your GridView control.That's it.

Thanks!

LinkButton Trigger inside a repeater

 I have been searching all over for an answer but have yet to find anything. 
 I have a repeater that I use to display a letter paging system.  It looks something like this   
 
<asp:Repeater ID="rpt_Letters" runat="server"> <ItemTemplate> <asp:LinkButton ID="lbtn_Letter" CausesValidation="false" CommandName="Filter" CommandArgument='<%# Eval("Letter") %>' runat="server" style="padding-left:7px; padding-top: 10px;" ToolTip='<%# Eval("Letter") %>'><%# Eval("Letter") %></asp:LinkButton> </ItemTemplate> </asp:Repeater>
 
Once a letter is clicked I want to update the information in a GridView.
I have the GridView in an update panel, but I can't find away to set my Letter Paging as a trigger.
 
 

Hi,

an approach could be wrapping the repeater with an UpdatePanel with UpdateMode="Conditional" and ChildrenAsTriggers="false". This won't make the panel update when a LinkButton is clicked, but will trigger an asynchronous postback where you can update the panel that contains the GridView. Check this basic example:

<%@. Page Language="C#" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><script runat="server"> protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { repTriggers.DataSource = new int[3] { 0, 1, 2 }; repTriggers.DataBind(); } } protected void repTriggers_ItemCommand(object sender, RepeaterCommandEventArgs e) { if (e.CommandName == "trigger") { LinkButton btn = e.CommandSource as LinkButton; if (btn != null) { lblUpdate.Text = "Update triggered by " + btn.ID + e.Item.ItemIndex.ToString(); } UpdatePanel2.Update(); } }</script><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <asp:ScriptManager ID="TheScriptManager" runat="server"></asp:ScriptManager> <asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="false" UpdateMode="conditional"> <ContentTemplate> <asp:Repeater ID="repTriggers" runat="server" OnItemCommand="repTriggers_ItemCommand"> <ItemTemplate> <asp:LinkButton ID="lnkTrigger" runat="server" Text="Trigger" CommandName="trigger"></asp:LinkButton> </ItemTemplate> </asp:Repeater> </ContentTemplate> </asp:UpdatePanel> <asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="conditional"> <ContentTemplate> <asp:Label ID="lblUpdate" runat="server"></asp:Label> </ContentTemplate> </asp:UpdatePanel> </form></body></html>

Good suggestion, Garbin, but I think I have an even easier way. You can simply add your Repeater as a trigger for your UpdatePanel. Here's my version, with comments indicating where it differs from Garbin's:

<%@. Page Language="C#" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><script runat="server"> protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { repTriggers.DataSource = new int[3] { 0, 1, 2 }; repTriggers.DataBind(); } } protected void repTriggers_ItemCommand(object sender, RepeaterCommandEventArgs e) { if (e.CommandName == "trigger") { LinkButton btn = e.CommandSource as LinkButton; if (btn != null) { lblUpdate.Text = "Update triggered by " + btn.ID + e.Item.ItemIndex.ToString(); } // [Steve] removed UpdatePanel2.Update() } }</script><html xmlns="http://www.w3.org/1999/xhtml" ><head id="Head1" runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <asp:ScriptManager ID="TheScriptManager" runat="server"></asp:ScriptManager><%-- [Steve] removed UpdatePanel1 --%> <asp:Repeater ID="repTriggers" runat="server" OnItemCommand="repTriggers_ItemCommand"> <ItemTemplate> <asp:LinkButton ID="lnkTrigger" runat="server" Text="Trigger" CommandName="trigger"></asp:LinkButton> </ItemTemplate> </asp:Repeater> <asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="conditional"><%-- [Steve] added repTriggers as an AsyncPostBackTrigger --%> <Triggers> <asp:AsyncPostBackTrigger ControlID="repTriggers" /> </Triggers> <ContentTemplate> <asp:Label ID="lblUpdate" runat="server"></asp:Label> </ContentTemplate> </asp:UpdatePanel> </form></body></html>

Hi,

yes, definitely :)

Thank you!

That was too easy! I can't believe I never tried that.