Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

LinkButton created on PostBack; OnClick Event not fired

Posted on 2011-03-21
6
Medium Priority
?
2,357 Views
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>

Open in new window


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>

Open in new window


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);

Open in new window


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
  • 3
  • 2
6 Comments
 
LVL 61

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 61

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
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
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>

Open in new window


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();

Open in new window

0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …
Hello there! As a developer I have modified and refactored the unit tests which was written by fellow developers in the past. On the course, I have gone through various misconceptions and technical challenges when it comes to implementation. I would…
This video shows how to quickly and easily deploy an email signature for all users in Office 365 and prevent it from being added to replies and forwards. (the resulting signature is applied on the server level in Exchange Online) The email signat…
Enter Foreign and Special Characters Enter characters you can't find on a keyboard using its ASCII code ... and learn how to make a handy reference for yourself using Excel ~ Use these codes in any Windows application! ... whether it is a Micr…
Suggested Courses
Course of the Month15 days, 23 hours left to enroll

580 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question