How to add an unique wrapper id to a widget element?

I made a widget that "generates" fields based on the option chosen of a select field. I got most of the logic done:

1- An option is chosen from this field:

 $element['value'] = [   '#type' => 'select',   '#options' => $this->getBreakpointsGroups(),   '#default_value' => $value,   '#ajax' => [     'callback' => [$this,'updateBreakpoint'], // don't forget :: when calling a class method.     'event' => 'change',     'wrapper' => $wrapper_id, // This element is updated with this AJAX callback.     'method' => 'html',   ] ];   

2-Then the function updateBreakpoint is executed and it proceeds to update the form. First I extract the wrapper value in case there are multiple widget forms so it doesn’t target another instance of the same form.

    $state = $form_state->getTriggeringElement();     $wrapper_id = $state['#ajax']['wrapper']; 

3- After making some changes to the form I return the changes and use an AJAX command

    $ajax_response = new AjaxResponse();     $ajax_response->addCommand(new HtmlCommand("div#{$wrapper_id}",  $form['image_fieldset']));     return $ajax_response; 

The wrapper is defined inside the formElement function in the following way:

    $wrapper_id = Html::getUniqueId('wrapper'); 

The problem is that no change is made. When I define $wrapper_id as a string without any unique id functions (‘wrapper’ for example) the changes are made. I’m confused as to why. I made sure to check the value of the wrapper persisted in all the form.

This article was republished from its original source.
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How to add an unique wrapper id to a widget element?

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