chill-bundles/src/Bundle/ChillMainBundle/Resources/public/module/blur/index.js

require('./blur.scss');

document.querySelectorAll('.confidential').forEach(function (el) {
    let i = document.createElement('i');
    const classes = ['fa', 'fa-eye-slash', 'toggle-twig'];
    i.classList.add(...classes);
    el.appendChild(i);

    const toggleBlur = function(e) {
        for (let child of el.children) {
            if (!child.classList.contains('toggle-twig')) {
                child.classList.toggle('blur');
            }
        }
        i.classList.toggle('fa-eye-slash');
        i.classList.toggle('fa-eye');
    }
    i.addEventListener('click', toggleBlur);
    toggleBlur();
});