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

// 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',
    extends: 'select',
    properties: {
      bindValue: {
        type: String,
        notify: true,
        observer: '_updateValue',
      },
    },

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

    _updateValue() {
      if (this.bindValue) {
        this.value = this.bindValue;
      }
    },

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

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