How to load Widget javascript + css files only if used?

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I’d like to keep the javascript and css styles used by my widget inside their own files (and not add them to the theme).

But i can’t seem to get wordpress to add them when the widget is actually used on a sidebar.

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I’ve tried this:

inside the Class declaration, i’ve added 2 functions 

class EssentielleRubriquesPosts extends WP_Widget {

function addFrontendCss(){
    wp_enqueue_style('erw-frontend-css', ESSENTIELLE_RUBRIQUE_WIDGET_PLUGIN_PATH . 'css/EssentielleRubriqueWidget-frontend.css');
}
function addFrontendJavascript(){
    wp_register_script('jq-hoverintent', PLUGIN_PATH . 'js/jquery.hoverintent.js', array('jquery'), '1.0',true);
    wp_enqueue_script('jq-hoverintent');
    wp_enqueue_script('jq-tools', PLUGIN_PATH . 'js/jquery.tools.js', array('jquery'),'1.0',true);
    wp_enqueue_script('erw-frontend-js', PLUGIN_PATH . 'js/widget-frontend.js', array('jquery', 'jq-hoverintent', 'jq-tools'),'1.0',true);

}

and inside the widget() function: 

function widget($args, $instance) {
        add_action( 'wp_print_scripts', 'addFrontendJavascript' );
        add_action( 'wp_print_styles', 'addFrontendCss' );
}

But that doesn’t do anything…

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2 comments

  2. Best solution is to register your assets first and then enqueue the CSS and JS inside the widget() function of your WP_Widget (directly enqueue, not by adding new hooks).

    I have tested this solution and it does work in current WordPress version (4.5.3) – both the JS and the CSS are added in the page footer.

    <?php
// Register your assets during `wp_enqueue_scripts` hook.
function custom_register_scripts() {
    wp_register_style('erw-frontend-css', '...frontend.css');
    wp_register_script('jq-hoverintent', '...hoverintent.js', ...);
    wp_register_script('jq-tools', '...tools.js', ...);
}
// Use wp_enqueue_scripts hook
add_action('wp_enqueue_scripts', 'custom_register_scripts');


class YourWidget extends WP_Widget {
    public function __construct() {
    }

    public function widget( $args, $instance ) {
        // Enqueue needed assets inside the `widget` function.
        wp_enqueue_style('erw-frontend-css');
        wp_enqueue_script('jq-hoverintent');
        wp_enqueue_script('jq-tools');

        // Output widget contents.
    }

    public function form( $instance ) {
    }

    public function update( $new_instance, $old_instance ) {
    }
}