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Description

Adds async/defer attributes to enqueued / registered scripts.

If #12009 lands in WordPress, this function can no-op since it would be handled in core.

Usage

$string = TwentyTwenty_Script_Loader::filter_script_loader_tag( $tag, $handle );

Parameters

$tag

( string ) required – The script tag.

$handle

( string ) required – The script handle.

Returns

string Script HTML string.

Source

File name: twentytwenty/classes/class-twentytwenty-script-loader.php

    public function filter_script_loader_tag( $tag, $handle ) {
      foreach ( [ 'async', 'defer' ] as $attr ) {
        if ( ! wp_scripts()->get_data( $handle, $attr ) ) {
          continue;
        }
        // Prevent adding attribute when already added in #12009.
        if ( ! preg_match( ":\s$attr(=|>|\s):", $tag ) ) {
          $tag = preg_replace( ':(?=></script>):', " $attr", $tag, 1 );
        }
        // Only allow async or defer, not both.
        break;
      }
      return $tag;
    }
 

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