customize_preview_init: listening for any changes from Customizer preview area

Question

I know I can listen for specific setting changes from the previewer by adding the following JS to the customize_preview_init hook:

wp.customize( 'setting-ID', function ( value ) {
    value.bind( function( val ) {    
      // things go here
    } );
} );

But can I easily listen for any changes? Or a group of changes? For example, I have a ton of settings that are all named something like: my_settings[setting_a], my_setting[setting_b]

Answer 1

Yes. You can bind to the change event on the entire Setting collection (wp.customize) as follows:

wp.customize.bind( 'change', function ( setting ) {
    if ( 0 === setting.id.indexOf( 'my_settings[' ) ) {
        doSomethingWithSettingValue( setting.get() );
    }
});