overview.js

/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

define([
    'jquery',
    'jquery/ui',
    'mage/translate'
], function ($) {
    'use strict';

    $.widget('mage.orderOverview', {
        options: {
            opacity: 0.5, // CSS opacity for the 'Place Order' button when it's clicked and then disabled.
            pleaseWaitLoader: 'span.please-wait', // 'Submitting order information...' Ajax loader.
            placeOrderSubmit: 'button[type="submit"]', // The 'Place Order' button.
            agreements: '#checkout-agreements' // Container for all of the checkout agreements and terms/conditions
        },

        /**
         * Bind a submit handler to the form.
         * @private
         */
        _create: function () {
            this.element.on('submit', $.proxy(this._showLoader, this));
        },

        /**
         * Verify that all agreements and terms/conditions are checked. Show the Ajax loader. Disable
         * the submit button (i.e. Place Order).
         * @return {Boolean}
         * @private
         */
        _showLoader: function () {
            if ($(this.options.agreements).find('input[type="checkbox"]:not(:checked)').length > 0) {
                return false;
            }
            this.element.find(this.options.pleaseWaitLoader).show().end()
                .find(this.options.placeOrderSubmit).prop('disabled', true).css('opacity', this.options.opacity);

            return true;
        }
    });

    return $.mage.orderOverview;
});