polygerrit-ui/app/elements/shared/gr-select/gr-select.js

/**
 * @license
 * Copyright (C) 2016 The Android Open Source Project
 *
 * 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.
 */
(function() {
  'use strict';

  Polymer({
    is: 'gr-select',
    properties: {
      bindValue: {
        type: String,
        notify: true,
        observer: '_updateValue',
      },
    },

    listeners: {
      'change': '_valueChanged',
      'dom-change': '_updateValue',
    },

    get nativeSelect() {
      return this.$$('select');
    },

    _updateValue() {
      // It's possible to have a value of 0.
      if (this.bindValue !== undefined) {
        // Set for chrome/safari so it happens instantly
        this.nativeSelect.value = this.bindValue;
        // Async needed for firefox to populate value. It was trying to do it
        // before options from a dom-repeat were rendered previously.
        // See https://bugs.chromium.org/p/gerrit/issues/detail?id=7735
        this.async(() => {
          this.nativeSelect.value = this.bindValue;
        }, 1);
      }
    },

    _valueChanged() {
      this.bindValue = this.nativeSelect.value;
    },

    ready() {
      // If not set via the property, set bind-value to the element value.
      if (!this.bindValue) { this.bindValue = this.nativeSelect.value; }
    },
  });
})();