third_party/polymer/components/paper-radio-group/paper-radio-group.html

   1 <!--
   2 Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
   3 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
   4 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
   5 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
   6 Code distributed by Google as part of the polymer project is also
   7 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
   8 -->
   9
  10 <!--
  11 `paper-radio-group` allows user to select only one radio button from a set.
  12 Checking one radio button that belongs to a radio group unchecks any
  13 previously checked radio button within the same group. Use
  14 `selected` to get or set the selected radio button.
  15
  16 Example:
  17
  18     <paper-radio-group selected="small">
  19       <paper-radio-button name="small" label="Small"></paper-radio-button>
  20       <paper-radio-button name="medium" label="Medium"></paper-radio-button>
  21       <paper-radio-button name="large" label="Large"></paper-radio-button>
  22     </paper-radio-group>
  23
  24 See <a href="../paper-radio-button/">paper-radio-button</a> for more
  25 information about `paper-radio-button`.
  26
  27 @group Paper Elements
  28 @element paper-radio-group
  29 @extends core-selector
  30 @homepage github.io
  31 -->
  32
  33 <link rel="import" href="../core-a11y-keys/core-a11y-keys.html">
  34 <link rel="import" href="../core-selector/core-selector.html">
  35 <link rel="import" href="../paper-radio-button/paper-radio-button.html">
  36
  37 <polymer-element name="paper-radio-group" extends="core-selector" role="radiogroup">
  38
  39   <template>
  40
  41     <core-a11y-keys target="{{}}" keys="up left" on-keys-pressed="{{selectPrevious}}"></core-a11y-keys>
  42     <core-a11y-keys target="{{}}" keys="down right" on-keys-pressed="{{selectNext}}"></core-a11y-keys>
  43
  44     <style>
  45
  46       :host {
  47         display: inline-block;
  48       }
  49
  50       polyfill-next-selector { content: ':host > *'; }
  51       ::content > * {
  52         padding: 12px;
  53       }
  54
  55     </style>
  56
  57     <shadow></shadow>
  58
  59   </template>
  60
  61   <script>
  62
  63     Polymer('paper-radio-group', {
  64       nextIndex: function(index) {
  65         var items = this.items;
  66         var newIndex = index;
  67         do {
  68           newIndex = (newIndex + 1) % items.length;
  69           if (newIndex === index) {
  70             break;
  71           }
  72         } while (items[newIndex].disabled);
  73         return newIndex;
  74       },
  75       previousIndex: function(index) {
  76         var items = this.items;
  77         var newIndex = index;
  78         do {
  79           newIndex = (newIndex || items.length) - 1;
  80           if (newIndex === index) {
  81             break;
  82           }
  83         } while (items[newIndex].disabled);
  84         return newIndex;
  85       },
  86       selectNext: function() {
  87         var node = this.selectIndex(this.nextIndex(this.selectedIndex));
  88         node.focus();
  89       },
  90       selectPrevious: function() {
  91         var node = this.selectIndex(this.previousIndex(this.selectedIndex));
  92         node.focus();
  93       },
  94       selectedAttribute: 'checked',
  95       activateEvent: 'change'
  96
  97     });
  98
  99   </script>
 100
 101 </polymer-element>