cx-newsletter/renders/scripts/preview.js

document.addEventListener("DOMContentLoaded", () => {
    const container = document.querySelector(".cx-newsletter-container");
    const preview = container.querySelector(".preview");
    const reload = container.querySelector(".reload");

    reload.addEventListener("click", () => { reload_it(); });

    setTimeout(() => { reload_it(); }, 500);

    const reload_it = () => {
        if (tinymce.activeEditor) {
            preview.srcdoc = tinymce.activeEditor.getContent();
        }
    };
});