wp_post_preview_js

Outputs a small JS snippet on preview tabs/windows to remove `window.name` on unload.

Description

wp_post_preview_js(); 

This prevents reusing the same tab for a preview when the user has navigated away.

Usage

  1. if ( !function_exists( 'wp_post_preview_js' ) ) { 
  2.     require_once ABSPATH . WPINC . '/functions.php'; 
  3. } 
  4.  
  5.   
  6. // NOTICE! Understand what this does before running. 
  7. $result = wp_post_preview_js(); 
  8.     

Defined (1)

The function is defined in the following location(s).

/wp-includes/functions.php  
  1. function wp_post_preview_js() { 
  2.     global $post; 
  3.  
  4.     if ( ! is_preview() || empty( $post ) ) { 
  5.         return; 
  6.     } 
  7.  
  8.     // Has to match the window name used in post_submit_meta_box() 
  9.     $name = 'wp-preview-' . (int) $post->ID; 
  10.  
  11.     ?> 
  12.     <script> 
  13.     ( function() { 
  14.         var query = document.location.search; 
  15.  
  16.         if ( query && query.indexOf( 'preview=true' ) !== -1 ) { 
  17.             window.name = '<?php echo $name; ?>'; 
  18.         } 
  19.  
  20.         if ( window.addEventListener ) { 
  21.             window.addEventListener( 'unload', function() { window.name = ''; }, false ); 
  22.         } 
  23.     }()); 
  24.     </script> 
  25.     <?php