edx-platform/lms/static/js/form.ext.js

// eslint-disable-next-line no-shadow-restricted-names
(function($, undefined) {
    var form_ext;
    // eslint-disable-next-line no-multi-assign
    $.form_ext = form_ext = {
        ajax: function(options) {
            return $.ajax(options);
        },
        handleRemote: function(element) {
            var method = element.attr('method');
            var url = element.attr('action');
            var data = element.serializeArray();
            var options = {
                type: method || 'GET',
                data: data,
                dataType: 'text json',
                // eslint-disable-next-line no-shadow
                success: function(data, status, xhr) {
                    element.trigger('ajax:success', [data, status, xhr]);
                },
                complete: function(xhr, status) {
                    element.trigger('ajax:complete', [xhr, status]);
                },
                error: function(xhr, status, error) {
                    element.trigger('ajax:error', [xhr, status, error]);
                }
            };
            if (url) { options.url = url; }
            return form_ext.ajax(options);
        },
        CSRFProtection: function(xhr) {
            var token = $.cookie('csrftoken');
            if (token) { xhr.setRequestHeader('X-CSRFToken', token); }
        }
    };
    $.ajaxPrefilter(function(options, originalOptions, xhr) { if (!options.crossDomain) { form_ext.CSRFProtection(xhr); } });
    $(document).delegate('form', 'submit', function(e) {
        var $form = $(this),
            remote = $form.data('remote') !== undefined;

        if (remote) {
            form_ext.handleRemote($form);
            return false;
        }
    });
}(jQuery));