app/views/js_namespace_rails/_hook.js.erb
document.addEventListener('DOMContentLoaded', function() {
document.body.setAttribute('data-controller', '<%= controller_path.gsub(/\//,'_') %>');
document.body.setAttribute('data-action', '<%= action_name %>');
if(window.JsSpace){
window.JsSpace.params = <%= raw @js_namespace_rails_params.to_json %>;
}
});