[wp-trac] [WordPress Trac] #32766: customize_register fires twice, cannot pass query args properly

[WordPress Trac]

#32766: customize_register fires twice, cannot pass query args properly
-------------------------------+------------------------------
 Reporter:  eherman24          |       Owner:
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  Customize          |     Version:  4.2.2
 Severity:  normal             |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:  administration
-------------------------------+------------------------------
Changes (by westonruter):

 * keywords:   => reporter-feedback


Comment:

 The `customize_register` action fires in the admin for the Customizer pane
 (`customize.php`); the second time it fires it is in the context of the
 Customizer preview, which is in the frontend.

 So even if you load the Customizer via `customize.php?foo=bar`, then this
 `$_GET['foo']` variable will always be empty in the context of the
 `customize_register` that happens in the preview.

 So what you need to do is ensure that query params passed into the
 Customizer also get amended to any URL being previewed. You should be able
 to accomplish this with some plugin JS like the following that runs in
 `customize.php`:

 {{{#!js
 wp.customize.bind( 'ready', function () {
         var oldValidate = wp.customize.previewer.previewUrl.validate;
         wp.customize.previewer.previewUrl.validate = function ( url ) {
                 url = oldValidate.call( this, url );
                 if ( url && location.search.length > 1 ) {
                         url = url.replace( /#.*/, '' ); // Remove URL
 fragment
                         if ( -1 === url.indexOf( '?' ) ) {
                                 url += '?'; // Make sure query string is
 provided
                         }
                         url += '&' + location.search.substr( 1 ); //
 Append query args from customize.php
                 }
                 return url;
         };
 } );
 }}}

 If this is roughly what you're looking for, please close this ticket as
 it's not a Core bug and a different forum should be used for hashing
 through this.

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Ticket URL: <https://core.trac.wordpress.org/ticket/32766#comment:3>
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