asynchronously-load-javascript-in-wordpress.code-snippets.xml

<?xml version="1.0" encoding="UTF-8"?>
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<snippets>
  <snippet scope="2">
    <name>Asynchronously load JavaScript in WordPress</name>
    <desc></desc>
    <tags>performance, javascript, async, wordpress, scripts</tags>
    <code>/*Function to defer load scripts*/&#13;
function js_async_attr($tag){&#13;
&#13;
# Do not add defer or async attribute to these scripts&#13;
$scripts_to_exclude = array('script1.js', 'script2.js', 'script3.js');&#13;
&#13;
foreach($scripts_to_exclude as $exclude_script){&#13;
 if(true == strpos($tag, $exclude_script ) )&#13;
 return $tag; &#13;
}&#13;
&#13;
# Defer or async all remaining scripts not excluded above&#13;
return str_replace( ' src', ' async=”async” src', $tag );&#13;
}&#13;
add_filter( 'script_loader_tag', 'js_async_attr', 10 );</code>
  </snippet>
</snippets>