Reply To: How to add a class input field to WYSIWYG link insert

• robertark

• December 18, 2014 at 7:44 am

This is not the fault of ACF, but TinyMCE (and a little bit of WP for stripping it down).

See: http://code.tutsplus.com/tutorials/adding-custom-styles-in-wordpress-tinymce-editor–wp-24980

Basically, you’ll need to write your own functions.php filter or install this plugin: http://wordpress.org/extend/plugins/tinymce-advanced/

Filter example:

add_filter( 'tiny_mce_before_init', 'custom_mce_before_init' );
function custom_mce_before_init( $settings ) {
    $style_formats = array(
        array(
            'title' => 'Some Style',
            'selector' => 'a',
            'classes' => 'my-anchor-class',
        )
    );
    $settings['style_formats'] = json_encode( $style_formats );
    return $settings;
}