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LinkButton created on PostBack; OnClick Event not fired

Posted on 2011-03-21
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Last Modified: 2012-05-11
I have a page with an UpdatePanel, this UpdatePanel contains a ListView with several items from a asp:SqlDataSource. This ListView also has a DataPager. The UpdatePanel has the properties "ChildrenAsTriggers=false" and "UpdateMode=Conditional". And the DataPager Id is the ASyncPostBackTrigger for the UpdatePanel.

<asp:UpdatePanel ID="upListOfItems" runat="server" ChildrenAsTriggers="false" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="pListOfItems" />
</Triggers>
<ContentTemplate>
<asp:ListView DataSourceID="dsItems" ID="lvItems" runat="server">
<LayoutTemplate>
<asp:PlaceHolder runat="server" ID="itemPlaceholder" />
</LayoutTemplate>
<ItemTemplate>
<%#Eval("Title")%>
</ItemTemplate>
</ListView>
<asp:DataPager runat="server" ID="pListOfItems" PageSize="10" PagedControlID="lvItems">
</asp:DataPager>
</ContentTemplate>
</UpdatePanel>

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The Items in the ItemTemplate have more than only this Title ofcourse, they look something like this:

<ItemTemplate>
<asp:UpdatePanel ID="upItem" runat="server" ChildrenAsTriggers="false" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnSetItemStatus" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="btnShowSubItems" EventName="Click" />
</Triggers>
<ContentTemplate>
<div class="item">
<div class="text">
<div class="top">
<h3>
<%#Eval("Title") %>
</h3>
</div>
</div>
<div class="description">
<%#Eval("Description") %>
</div>
<div class="menu">
<asp:LinkButton ID="btnSetItemStatus" runat="server" OnClick="BtnSetItemStatus_Click" CommandArgument='<%#Eval("ItemId") %>' Text="change status" />
</div>
<div class="notifications">
<asp:LinkButton ID="btnShowSubItems" runat="server" OnClick="BtnShowSubItems_Click" CommandArgument='<%#Eval("ItemId") %>' Text="show sub items" />
</div>
<asp:Panel ID="pnlSubItems" runat="server" Visible="false">
</asp:Panel>
</div>
</div>
</ContentTemplate>
</asp:UpdatePanel>
</ItemTemplate>

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When the button BtnShowSubItems is clicked, the function BtnShowSubItems_Click fills the pnlSubItems with several sub item divs.
These div's have the same buttons as the items above, so each sub-item as a button to change the status of the sub item.
This button is created in the code behind as follows:

LinkButton setSubItemStatus = new LinkButton();
setSubItemStatus.Text = "change status";
setSubItemStatus.ID = "setitemstatus_" + subitemid.ToString();
setSubItemStatus.CommandArgument = subitemid.ToString();
setSubItemStatus.CausesValidation = false;
setSubItemStatus.Click += new EventHandler(BtnSetItemStatus_Click);

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Everything is show correctly, but the event as set in the last line is not fired.

I believe this has something to do with the button click creating a PostBack. But I wonder how I can get this situation to work, because I cannot create these buttons in the Page_Init function as described on several other fora/topics.

Thanks for your help,
Ingrid
0
Comment
Question by:ingriT
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6 Comments
 
LVL 59

Expert Comment

by:HainKurt
ID: 35181824
what about this:

setSubItemStatus.CommandArgument = subitemid.ToString();
-->
setSubItemStatus.CommandArgument = "DYNALINK_" + subitemid.ToString();

protected void grdProducts_RowCommand(Object sender, GridViewCommandEventArgs e)  {  
    if (e.CommandArgument.StartsWith("DYNALINK_") BtnSetItemStatus_Click(sender)

do you have RowCommand event? maybe it is hitting this when you click linkbutton, did you test this event?
0
 
LVL 59

Accepted Solution

by:
HainKurt earned 1500 total points
ID: 35181863
also you can set CommandName

setSubItemStatus.CommandArgument = subitemid.ToString();
-->
setSubItemStatus.CommandName = "DYNALINK";
setSubItemStatus.CommandArgument = subitemid.ToString();

then on RowCommand

protected void grdProducts_RowCommand(Object sender, GridViewCommandEventArgs e)  {  
    if (e.CommandName == ("DYNALINK") BtnSetItemStatus_Click(sender);
0
 
LVL 11

Expert Comment

by:SAMIR BHOGAYTA
ID: 35181946
Hi, try this code

private LinkButton createButton(string title, int index)

{

LinkButton lnk = new LinkButton();

//lnk.ID = System.Guid.NewGuid().ToString("N") + "_" + index.ToString();//Event does not fire if I set ID with Guid

lnk.ID = index.ToString();

lnk.Text = title;

lnk.CommandArgument = index.ToString();

lnk.Click += new EventHandler(lnkPager_Click);

return lnk;

}

 

protected void lnkPager_Click(object sender, EventArgs e) //Page index changed function

{

LinkButton lnk = (LinkButton)sender;

CurrentPageIndex = int.Parse(lnk.CommandArgument);

System.Data.SqlClient.SqlConnection oDetailsPageDB = new SqlConnection(CDatabase.CONNECTION_STRING);

oDetailsPageDB.Open();

CUserSession oUser = (CUserSession)Session["USER"];

CManagercontent oMancontent = CManagercontent.getManagercontent(oUser, m_nCategoryKey);

bindData(oDetailsPageDB,oUser,oMancontent);

SaveCheckBoxStatus();

}
0
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LVL 6

Author Comment

by:ingriT
ID: 35183530
@samirbhogayta
I'm not sure what to do with your code?

@HainKurt
Your solution doesn't work, because the subitems are not separate rows, they are a dynamic part of the items in the rows of the original listview. This did get me to think, that I could render the sub items in a listview within the listview of items. So I'm trying that right now to see if that does the trick!
0
 
LVL 6

Author Closing Comment

by:ingriT
ID: 35183733
It was not the complete solution. It did hint me to the complete solution (see below)
0
 
LVL 6

Author Comment

by:ingriT
ID: 35183783
In the ItemTemplate for the main items I created the following construction:
<asp:UpdatePanel runat="server">
<ContentTemplate>
<asp:ListView ID="subItems" runat="server" DataSourceId="dsSubItems">
<LayoutTemplate>
<asp:Placeholder Id="itemPlaceHolder" runat="server" />
</LayoutTemplate>
<ItemTemplate>
<%#Eval("Title") %>
<asp:LinkButton runat="server" CommandArgument='<%#Eval("ItemId") %>'
Text="change status" OnClick="SetItemStatus_Click" />
</ItemTemplate>
</asp:ListView>
<asp:SqlDataSource id="dsSubItems" runat="server" SelectCommandType="StoredProcedure" SelectCommand="Item_GetSubItems">
<SelectParameters>
<asp:Parameter Name="itemId" />
</SelectParameters>
</asp:SqlDataSource>
</ContentTemplate>
</asp:UpdatePanel>

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And then I set the itemId parameter for this SqlDataSource in the OnClick for the ShowSubItems.

ListView lvItemReactions = (ListView)pnlItems.FindControl("lvItemReactions");
SqlDataSource dsSubItems = (SqlDataSource)pnlItems.FindControl("dsSubItems");
dsSubItems.SelectParameters["itemId"].DefaultValue = itemId.ToString();
lvItems.DataBind();

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