Passing Information from Twig to JavaScript =========================================== In Symfony applications, you may find that you need to pass some dynamic data (e.g. user information) from Twig to your JavaScript code. One great way to pass dynamic configuration is by storing information in ``data`` attributes and reading them later in JavaScript. For example: .. code-block:: html+twig
Fetch this in JavaScript: .. code-block:: javascript document.addEventListener('DOMContentLoaded', function() { var userRating = document.querySelector('.js-user-rating'); var isAuthenticated = userRating.dataset.isAuthenticated; // or with jQuery //var isAuthenticated = $('.js-user-rating').data('isAuthenticated'); }); .. note:: When `accessing data attributes from JavaScript`_, the attribute names are converted from dash-style to camelCase. For example, ``data-is-authenticated`` becomes ``isAuthenticated`` and ``data-number-of-reviews`` becomes ``numberOfReviews``. There is no size limit for the value of the ``data-`` attributes, so you can store any content. In Twig, use the ``html_attr`` escaping strategy to avoid messing with HTML attributes. For example, if your ``User`` object has some ``getProfileData()`` method that returns an array, you could do the following: .. code-block:: html+twig