I'm working on a D8 project and in many cases I use file and image upload fields.

The files and the images are visible above the field and the user can delete them by using the default 'Remove' button.

What I want to do, is to add a confirmation popup asking if they really want to delete that files/images.

Is there any hook that I could use to make that check? If I use javascript, how can I say to drupal that now can proceed to deletion?

Thank you in advance.


I tried to do what @Ivan suggested but I can't make it work. My form has submit and ajax callback. Should I alter both?

Is there any working example? I am so desperate!!

  • 1
    You can alter the image/file widget(hook_field_widget_form_alter) and so that when the button is pressed a modal dialog is returned as ajax response instead of calling the delete method right away.
    – user21641
    Jul 17, 2017 at 18:44
  • Thanks. Should I overwrite the existing delete method and call it on my response function?
    – Ismini
    Jul 18, 2017 at 12:17

1 Answer 1


After long time I managed to find the solution. I didn't manage to make it work server side with modals so I managed to solve it using jQuery.

So I created a javascript file:

    Drupal.behaviors.confirm = {
        attach: function(context, settings) {

            $.each($('.form-submit'), function(){
                var str = $(this).attr('id');
                //find the id for each button
                var remove_btn_id = '#' + $(this).attr('id');

                //apply only to remove buttons and only to those that the functionality is not applied yet. 
                if (str.indexOf("-remove-button") >= 0 && !$(remove_btn_id).hasClass('custom-handler')){

                    //Drupal.behaviours are triggered every time my ajax was submitted and I ended up with multiple events to each button. 
                    //In order to avoid it, add a class to check if the button already has that functionality. 
                    $(remove_btn_id).bindFirst('mousedown', function(e, next) {

                       //Display popup and get user's decision.
                        var choice = confirm('Are you sure you want to delete that?');
                            //if user clicks cancel then do nothing

I'm not sure if this the right way to implement that functionality (I guess is not the Drupal way) but at leat it works!

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