@wearegenki/vue-directive-view/index.js

Vue custom directive to show/hide elements using opacity

/**
 * @wearegenki/vue-directive-view
 * @author: Max Milton <max@wearegenki.com>
 *
 * Copyright 2018 We Are Genki
 *
 * Licensed 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.
 */

let className = 'hide';

const vView = (el, { value, oldValue }) => {
  if (value === oldValue) return;

  if (value) {
    el.classList.remove(className);
  } else {
    el.classList.add(className);
  }
};

function install(Vue, options = {}) {
  const name = options.name || 'view';
  className = options.class || className;

  Vue.directive(name, vView);
}

export default {
  install, // for global install
  vView, // for local install
};