sncf/templates/assets/index.js

// on clicking Previous button in browser, reset the page
// needed to get another CSRF token and remove the spinning wheel
window.onpageshow = function() {
    if (performance.getEntriesByType("navigation")[0].type == "back_forward") {
        location.reload(false);
    }
}

let browse_forms_button = get('browse_forms_button');
let new_link_button = get('new_link_button');

// csrf_token is retrieved from server-side template
new_link_button.addEventListener('click', function() {
    get("csrf_token").value = csrf_token;
    get("new_link").submit();
    hideButtonsAndSpin();
});

if (browse_forms_button != undefined) {
    browse_forms_button.addEventListener('click', function () {
        hideButtonsAndSpin();
    });
}

function hideButtonsAndSpin() {
    new_link_button.classList.add("hidden");
    // hide the access forms button if it exists
    if (browse_forms_button != undefined) {
        browse_forms_button.classList.add("hidden");
    }
    get('loading_ring').classList.remove("hidden");
}

function get(elemId) {
    return document.getElementById(elemId);
}