[wp-trac] [WordPress Trac] #53548: Widget Block: widget_id is undefined when a widget is placed

[WordPress Trac]

#53548: Widget Block: widget_id is undefined when a widget is placed
------------------------------+-----------------------------
 Reporter:  subrataemfluence  |      Owner:  (none)
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Widgets           |    Version:  trunk
 Severity:  major             |   Keywords:
  Focuses:  administration    |
------------------------------+-----------------------------
 I am not sure whether this is already under discussion.
 While playing with the new Widget block of 5.8 Beta 3, I got the following
 notice:

 Undefined index: widget_id

 I am only trying to create an element inside the widget() method:

 {{{#!php
 <?php
 public function widget( $args, $instance ) { ?>
    <div id="element-$args['widget_id']">...</div>
 <?php }
 }}}


 However, when I switch to the classic Widget page more, the error goes
 away and a proper widget_id is returned.

 {{{#!php
 <?php
 public function widget( $args, $instance ) {
    if( ! isset( $args['widget_id'] ) ) { $args['widget_id'] = $this->id; }
 ?>
    <div id="element-$args['widget_id']">...</div>
 <?php }
 }}}


 The undefined notice does go away with the above modification, but
 `$this->id` is always `-1`. In general, an element with ID like `element--
 1`, is fine, but the problem starts when multiple instances of the same
 widget are placed and JavaScript is unable to locate the right element.
 The ID of each instance becomes the same.

 How to grab the ID of the current widget while on a Block based widget
 page?

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Ticket URL: <https://core.trac.wordpress.org/ticket/53548>
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