WP Deferred JavaScripts

WP Deferred JavaScript includes some hooks. If you never used one of them, check this page. It's better to use those filters in a plugin or a mu-plugin. do_not_defer is a filter that took as a parameter an array containing scripts that should be handle normally. Here is an example: // Normal script enqueue. add_action( 'wp_enqueue_scripts', 'register_canvas_script' ); function register_canvas_script() { wp_register_script( 'my-canvas-script', 'http://exemple.com/myscript.js' ); wp_enqueue_script( 'my-canvas-script' ); } // Don't defer this script. add_filter( 'do_not_defer', 'exclude_canvas_script' ); function exclude_canvas_script( $do_not_defer ) { $do_not_defer[] = 'my-canvas-script'; return $do_not_defer; } Since 2.0.3 you can also use the WP Deferred JS settings pannel!

wdjs_labjs_src is a filter that allow you to change LabJS URL. ($lab_src, $lab_ver) // for example, I need a specific version of LabJS add_filter( 'wdjs_labjs_src', 'my_labjs_src', 10, 2 ); function my_labjs_src( $src, $ver ) { if ( '2.0' !== $ver ) { // Hotlinking raw github is a bad practice, I did it just for the lulz. return 'https://raw.githubusercontent.com/getify/LABjs/edb9fed40dc224bc03c338be938cb586ef397fa6/LAB.min.js'; } return $src; }

If you use HTM5, wdjs_use_html5 is a filter that remove the type="text/javascript" attribute. You can use it this way: add_filter( 'wdjs_use_html5', '__return_true' );

wdjs_deferred_script_src can be used to change the way one of the script is loaded. For example: // Here, I need to add information about the charset. add_filter( 'wdjs_deferred_script_src', '', 10, 3 ); function change_my_script_src( $src_string, $handle, $src ) { // $src_string -> .script("http://exemple.com/myscript.js?v=2.0") // $handle -> my-script // $src -> http://exemple.com/myscript.js?v=2.0 $out = array( 'src' => $src, 'charset' => 'iso-8859-1' ); return '.wait(' . json_encode( $out ) . ')'; }

You may need to execute a script right after its loading. You can use wdjs_deferred_script_wait filter to do it. add_action( 'wdjs_deferred_script_wait', 'after_my_script', 10, 2 ); function after_my_script( $wait, $handle ) { if ( 'my-script' === $handle ) { $wait = 'function(){new MyScriptObject();}'; } return $wait; }

You may have to use inline JavaScript in your footer. If that's the case, you will have to use that last hook to make it compatible with WP Deferred JavaScripts. You will have to wrap this inline JS into a new function. Then, you will have to use wdjs_before_end_lab to execute it. // This is a fake function that we are wrapping in a new function add_filter( 'before_shitty_plugin_print_js', 'wrap_this_code' ); function wrap_this_code( $code ) { return 'function PluginShittyCode(){' . $code . '}'; } add_filter( 'wdjs_before_end_lab', 'call_shitty_code' ); function call_shitty_code( $end ) { $end .= '.PluginShittyCode()'; return $end; }