Ticket #12009: defer and async.patch

class.wp-scripts.php

@@ -114 +114 @@
 
                 $src = esc_url( apply_filters( 'script_loader_src', $src, $handle ) );
 
+                $defer = isset($this->registered[$handle]->extra['defer'])?"defer='defer'":false;
+                $async = isset($this->registered[$handle]->extra['async'])?"async='async'":false;
+
                 if ( $this->do_concat )
-                        $this->print_html .= "<script type='text/javascript' src='$src'></script>\n";
+                        $this->print_html .= "<script type='text/javascript' src='$src' $defer $async ></script>\n";
                 else
-                        echo "<script type='text/javascript' src='$src'></script>\n";
+                        echo "<script type='text/javascript' src='$src' $defer $async ></script>\n";
 
                 return true;
         }

functions.wp-scripts.php

@@ -49 +49 @@
  * @param bool $in_footer (optional) Whether to enqueue the script before </head> or before </body>
  * @return null
  */
-function wp_register_script( $handle, $src, $deps = array(), $ver = false, $in_footer = false ) {
+function wp_register_script( $handle, $src, $deps = array(), $ver = false, $in_footer = false, $defer = false, $async = false ) {
         global $wp_scripts;
         if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {
                 if ( ! did_action( 'init' ) )
@@ -61 +61 @@
         $wp_scripts->add( $handle, $src, $deps, $ver );
         if ( $in_footer )
                 $wp_scripts->add_data( $handle, 'group', 1 );
+        if ( $async )
+                $wp_scripts->add_data( $handle, 'async', 1 );
+        if ( $defer )
+                $wp_scripts->add_data( $handle, 'defer', 1 );
+
 }
 
 /**
@@ -122 +127 @@
  * @since r16
  * @see wp_register_script() For parameter information.
  */
-function wp_enqueue_script( $handle, $src = false, $deps = array(), $ver = false, $in_footer = false ) {
+function wp_enqueue_script( $handle, $src = false, $deps = array(), $ver = false, $in_footer = false, $defer = false, $async = false  ) {
         global $wp_scripts;
         if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {
                 if ( ! did_action( 'init' ) )
@@ -136 +141 @@
                 $wp_scripts->add( $_handle[0], $src, $deps, $ver );
                 if ( $in_footer )
                         $wp_scripts->add_data( $_handle[0], 'group', 1 );
+                if ( $async )
+                        $wp_scripts->add_data( $handle, 'async', 1 );
+                if ( $defer )
+                        $wp_scripts->add_data( $handle, 'defer', 1 );
+                        
         }
         $wp_scripts->enqueue( $handle );
 }