Passing parameters in an ASP.Net DetailsView image button OnClick event handler

Question

Is it possible to send a parameter in an ASP.Net image button OnClick event handler to a code-behind file?

In a DetailsView we have this markup for each day of the week for the Edit template and on top of that another bunch of coding for the insert template:

<EditItemTemplate>
    <asp:ImageButton 
        ID="ImageButtonEditDayOfWeekMonday" 
        runat="server" 
        ImageUrl='<%# getCheckboxImageToDisplay(Eval("DayOfWeekMonday"))%>' 
        Height="15"
        Width="15" 
        OnClick="ImageButtonEditDayOfWeekMonday_Click"
        CausesValidation="False">
    </asp:ImageButton>
</EditItemTemplate>

The handler in the code-behind file:

Protected Sub ImageButtonEditDayOfWeekTuesday_Click(sender As Object, e As ImageClickEventArgs)

    Dim imgTheImageButton As New ImageButton

    imgTheImageButton = DetailsView.FindControl("ImageButtonEditDayOfWeekTuesday")

    If imgTheImageButton.ImageUrl = "../../Images/checked.png" = True Then

        imgTheImageButton.ImageUrl = "../../Images/unchecked.png"
        LabelCheckBoxTuesday.Text = False
    Else

        imgTheImageButton.ImageUrl = "../../Images/checked.png"
        LabelCheckBoxTuesday.Text = True
    End If
End Sub

That will amount to a lot of coding.

Is it possible to do create a single handler and call it like this?

OnClick="ImageButtonDayOfWeek_Click("Monday", "Edit")

The only difference between all the handlers is:

imgTheImageButton = DetailsView.FindControl("ImageButtonEditDayOfWeekTuesday")

It would be nice to just use a bunch of if statements inside a single handler and use the appropriate "ID" to place in DetailsView.FindControl.

Andy Refuerzo · Accepted Answer · 2013-01-28 19:32:48Z

0

In your ImageButton, add a CommandArgument property:

<EditItemTemplate>
<asp:ImageButton 
    ID="ImageButtonEditDayOfWeekMonday" 
    runat="server" 
    ImageUrl='<%# getCheckboxImageToDisplay(Eval("DayOfWeekMonday"))%>' 
    Height="15"
    Width="15" 
    OnClick="ImageButtonEditDayOfWeekMonday_Click"
    CommandArgument='<%# Eval("DayOfWeekMonday") %>'
    CausesValidation="False">
</asp:ImageButton>

Then in your code-behind:

Protected Sub ImageButtonEditDayOfWeekTuesday_Click(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.CommandEventArgs)

    //e.CommandArgument should contain the actual value of DayOfWeekMonday
    Dim arg As String = e.CommandArgument.ToString()

End Sub

edited Jan 28, 2013 at 19:32

answered Jan 28, 2013 at 18:57

Andy Refuerzo

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4 Comments

Emad-ud-deen Over a year ago

Thanks for the quick reply. I used: CommandArgument="Monday, Edit" but when I type e. in the code behind file, I only get e.x and e.y as the possible values and not e.CommandArgument. Did I leave something out?

Andy Refuerzo Over a year ago

I changed the parameters of ImageButtonEditDayOfWeekTuesday_Click in the code behind. Try it. I got that from here stackoverflow.com/questions/7957816/…

Emad-ud-deen Over a year ago

Hi I get this error when I changed it to (ByVal sender As Object, ByVal e As System.Web.UI.WebControls.CommandEventArgs): Compiler Error Message: BC31143: Method 'Protected Sub ImageButtonEditDayOfWeekMonday_Click(sender As Object, e As System.Web.UI.WebControls.CommandEventArgs)' does not have a signature compatible with delegate 'Delegate Sub ImageClickEventHandler(sender As Object, e As System.Web.UI.ImageClickEventArgs)'.

Emad-ud-deen Over a year ago

The error message is real cryptic. Looks like it's possible it can't be done with image buttons.

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