Deletemethod in ASP.NET gridview does not fire when using javascript to confirm deletion

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.NET4.5

Hi Folks,

in my asp:GridViewcomponent I have the DeleteMethod setup. Also CommandField is set up:

ASP

<asp:CommandField ShowEditButton="true" ShowDeleteButton="true" ButtonType="Image" ControlStyle-Width="24px"
    EditImageUrl="~/Images/edit-icon-png-3601.png" CancelImageUrl="~/Images/close-button-png-30225.png" UpdateImageUrl="~/Images/check-tick-icon-14150.png" DeleteImageUrl="~/Images/trash-can-24846.png" />

In OnRowDataBound() method I check for the DeleteButton and add javascript to the onclientclick event.
The javascript works, but the Ok does not lead to starting the DeleteMethod in CodeBehind.

When I do not add the javascript, the method works.

How to have a delete commandbutton work with javascript?

** Using the .NET Framework 4.7.2

What I have tried:

My code to add the javascript:

C

public static void AddDeleteMessage(GridViewRow row)
{
    int nrControls = row.Controls.Count;
    Control lastGridViewCell = row.Controls[nrControls - 1];

    var deleteButton = lastGridViewCell.Controls.OfType<ImageButton>().FirstOrDefault(btn => btn.CommandName == "Delete");
    if (deleteButton != null)
    {
        deleteButton.OnClientClick = string.Format("javascript: return confirm(\"Are you sure?\");");
    }

Posted 8-Feb-24 2:44am

Herman<T>.Instance

Updated 8-Feb-24 2:51am

v2

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Richard Deeming · Accepted Answer · 2024-02-08T02:54:00

WebForms link/image buttons are implemented by calling some JavaScript when you click them.

But you have added JavaScript before that which unconditionally returns true/false, meaning that this code will never be called.

If you view the source of your page, you will see something that looks like:

HTML

onclick="javascript: return confirm(...); DoPostBack(...);"

Clearly the postback method can never be called.

Change your OnClientClick to only return if the user chooses to cancel:

C#

deleteButton.OnClientClick = "if(!confirm(\"Are you sure?\")){return false;}";