Index: third_party/polymer/v0_8/components/iron-a11y-announcer/iron-a11y-announcer.html |
diff --git a/third_party/polymer/v0_8/components/iron-a11y-announcer/iron-a11y-announcer.html b/third_party/polymer/v0_8/components/iron-a11y-announcer/iron-a11y-announcer.html |
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-<!-- |
-@license |
-Copyright (c) 2015 The Polymer Project Authors. All rights reserved. |
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt |
-The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt |
-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt |
-Code distributed by Google as part of the polymer project is also |
-subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt |
---> |
- |
-<link rel="import" href="../polymer/polymer.html"> |
- |
-<!-- |
-`iron-a11y-announcer` is a singleton element that is intended to add a11y |
-to features that require on-demand announcement from screen readers. In |
-order to make use of the announcer, it is best to request its availability |
-in the announcing element. |
- |
-Example: |
- |
- Polymer({ |
- |
- is: 'x-chatty', |
- |
- attached: function() { |
- // This will create the singlton element if it has not |
- // been created yet: |
- Polymer.IronA11yAnnouncer.requestAvailability(); |
- } |
- }); |
- |
-After the `iron-a11y-announcer` has been made available, elements can |
-make announces by firing bubbling `iron-announce` events. |
- |
-Example: |
- |
- this.fire('iron-announce', { |
- text: 'This is an announcement!' |
- }, { bubbles: true }); |
- |
-Note: announcements are only audible if you have a screen reader enabled. |
- |
-@group Iron Elements |
-@demo demo/index.html |
---> |
- |
-<dom-module id="iron-a11y-announcer"> |
- <style> |
- :host { |
- display: inline-block; |
- position: fixed; |
- clip: rect(0px,0px,0px,0px); |
- } |
- </style> |
- |
- <template> |
- <span aria-live$="[[mode]]">[[_text]]</span> |
- </template> |
- |
- <script> |
- |
- (function() { |
- 'use strict'; |
- |
- Polymer.IronA11yAnnouncer = Polymer({ |
- is: 'iron-a11y-announcer', |
- |
- properties: { |
- |
- /** |
- * The value of mode is used to set the `aria-live` attribute |
- * for the element that will be announced. Valid values are: `off`, |
- * `polite` and `assertive`. |
- */ |
- mode: { |
- type: String, |
- value: 'polite' |
- }, |
- |
- _text: { |
- type: String, |
- value: '' |
- } |
- }, |
- |
- created: function() { |
- if (!Polymer.IronA11yAnnouncer.instance) { |
- Polymer.IronA11yAnnouncer.instance = this; |
- } |
- |
- document.body.addEventListener('iron-announce', this._onIronAnnounce.bind(this)); |
- }, |
- |
- /** |
- * Cause a text string to be announced by screen readers. |
- * |
- * @param {string} text The text that should be announced. |
- */ |
- announce: function(text) { |
- this._text = ''; |
- this.async(function() { |
- this._text = text; |
- }, 100); |
- }, |
- |
- _onIronAnnounce: function(event) { |
- if (event.detail && event.detail.text) { |
- this.announce(event.detail.text); |
- } |
- } |
- }); |
- |
- Polymer.IronA11yAnnouncer.instance = null; |
- |
- Polymer.IronA11yAnnouncer.requestAvailability = function() { |
- if (!Polymer.IronA11yAnnouncer.instance) { |
- document.createElement('iron-a11y-announcer'); |
- } |
- |
- document.body.appendChild(Polymer.IronA11yAnnouncer.instance); |
- }; |
- })(); |
- |
- </script> |
-</dom-module> |