[wp-trac] [WordPress Trac] #37425: Passing variables withing the previewURL get lost on server side

[WordPress Trac]

#37425: Passing variables withing the previewURL get lost on server side
--------------------------+-----------------------------
 Reporter:  virgodesign   |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Customize     |    Version:  4.5.3
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 I'm experiencing the following problem and I don't know exactly if it's a
 bug or a normal behavior.
 I'm trying to pass a custom variable within the previewUrl using the
 wp.customize javascript object as following:

 {{{
 wp.customize.previewer.previewUrl( 'http://www.example.com/?custom_var=1'
 );
 }}}

 and then call the refresh method to launch the ajax request

 {{{
 wp.customize.previewer.refresh();
 }}}

 To customize the preview that will return back to the customizer we need
 to perform a check as following:


 {{{
 function load_custom_template( $template ) {

         if( is_customize_preview() && isset($_GET['custom_var']) ) {

                         $new_template = locate_template( array(
 'custom_template.php' ) );
                         if ( '' != $new_template ) {
                                 return $new_template ;
                         }

                 }
         }

         return $template;

     }
     add_filter( 'template_include', 'load_custom_template', 99 );
 }}}


 But when we try to retrieve the $_GET variable, this is missing.
 The REQUEST_URI seems to have no get variables.

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Ticket URL: <https://core.trac.wordpress.org/ticket/37425>
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