frontend/app/modules/loading/loading.service.js

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

export default function() {
    const _overlays = {};

    /**
     * @param {string} key
     */
    const start = (key) => {
        setTimeout(() => {
            const loadingOverlay = _overlays[key];

            loadingOverlay && loadingOverlay.addClass('loading-active');
        });
    };

    /**
     * @param {string} key
     */
    const finish = (key) => {
        setTimeout(() => {
            const loadingOverlay = _overlays[key];

            loadingOverlay && loadingOverlay.removeClass('loading-active');
        });
    };

    const add = (key, element) => {
        _overlays[key] = element;

        return element;
    };

    return {
        add,
        start,
        finish
    };
}