Repeater: javascript to button in itemlist via c#

Question

I've got a repeater with an itemlist, it get's data via C#/sql and a databind. I then want to add onclick javascript to my 'deleteNewsButton' in the itemlist. Im guessing that i have to use OnItemDataBound?

Heres my repeater:

<asp:Repeater ID="newsListRepeater" runat="server" OnItemDataBound="deleteConfirm_Databound">
        <ItemTemplate>
            <tr>
                <td><%# Eval("id") %></td>
                <td><%# Eval("title") %></td>
                <td><%# Eval("tags") %></td>
                <td><%# Eval("author") %></td>
                <td style="width:100px;"><%# DataBinder.Eval(Container.DataItem, "time", "{0:dd/MM/yyyy}") %></td>
                <td style="width:110px;">
                    <asp:Button ID="editNewsButton" runat="server" OnCommand="editNewsButton_Click" CommandArgument='<%# Eval("id") %>' Text="Rediger" />
                    <asp:Button ID="deleteNewsButton" runat="server" CommandArgument='<%# Eval("id") %>' Text="Slet" />
                </td>
            </tr>
        </ItemTemplate>
</asp:Repeater>

EDIT: How would i bind a paramter from behind code, to my 'deleteNewsButton' controllers. It needs to be done from behind code...

I want to add an attribute to my button 'deleteNewsButton' from the behind code? — Christian Bekker, Sep 04 '12 at 11:00

score 2 · Accepted Answer · answered Sep 04 '12 at 10:25

I believe for a repeater item databound event you need to use RepeaterItemEventArgs instead of RepeaterItem

protected void deleteConfirm_Databound(object sender, RepeaterItem e)

becomes

protected void deleteConfirm_Databound(object sender, RepeaterItemEventArgs e)

You might also want a null check for that control:

LinkButton button = (LinkButton)e.FindControl("deleteNewsButton");  
if(button != null) {
    button.Attributes.Add("onclick", "javascript:return " +  
        "confirm('Er du sikker på du vil slette: " +  DataBinder.Eval(e.DataItem, "id") + "')"); 
}

You may also consider making a common javascript function for the confirm box, and then just calling it from your button.

aspx

<script type="text/javascript">
function confirmFunction(id)
{
   return confirm('Er du sikker på du vil slette: ' +  id); 
}
</script>

codebehind

LinkButton button = (LinkButton)e.FindControl("deleteNewsButton");  
if(button != null) {
    button.Attributes.Add("onclick", "javascript:return confirmFunction(" + DataBinder.Eval(e.DataItem, "id") + ");"); 
}

Note that this was in response to the pre-edit question, so it was relevant at one point. I am posting this to avoid downvotes from those late to the party ;) — J. Tanner, Sep 04 '12 at 10:34
I think you are on the right track. But i cant use e.FindControl (error: Does not contain a definition for FindControl)? And the same for DataItem — Christian Bekker, Sep 04 '12 at 10:54
I found the problem, its a button not a link button. And have to do: e.Item.Findcontrol, else it works like a charm — Christian Bekker, Sep 04 '12 at 11:05

score 1 · Answer 2 · answered Sep 04 '12 at 10:00

1

add an onclientclick event eg.

<asp:Button ID="deleteNewsButton"  
OnClientClick="return confirm('Do you really want to Delete this record ?')" 
runat="server" CommandArgument='<%# Eval("id") %>' Text="Slet" />

answered Sep 04 '12 at 10:00

Ankush Jain

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Repeater: javascript to button in itemlist via c#

2 Answers2