1<!-- 2@license 3Copyright (c) 2015 The Polymer Project Authors. All rights reserved. 4This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt 5The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt 6The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt 7Code distributed by Google as part of the polymer project is also 8subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt 9--> 10 11<link rel="import" href="../polymer/polymer.html"> 12<link rel="import" href="../iron-menu-behavior/iron-menu-behavior.html"> 13<link rel="import" href="../paper-styles/default-theme.html"> 14 15<!-- 16Material design: [Menus](https://www.google.com/design/spec/components/menus.html) 17 18`<paper-listbox>` implements an accessible listbox control with Material Design styling. The focused item 19is highlighted, and the selected item has bolded text. 20 21 <paper-listbox> 22 <paper-item>Item 1</paper-item> 23 <paper-item>Item 2</paper-item> 24 </paper-listbox> 25 26An initial selection can be specified with the `selected` attribute. 27 28 <paper-listbox selected="0"> 29 <paper-item>Item 1</paper-item> 30 <paper-item>Item 2</paper-item> 31 </paper-listbox> 32 33Make a multi-select listbox with the `multi` attribute. Items in a multi-select listbox can be deselected, 34and multiple item can be selected. 35 36 <paper-listbox multi> 37 <paper-item>Item 1</paper-item> 38 <paper-item>Item 2</paper-item> 39 </paper-listbox> 40 41### Styling 42 43The following custom properties and mixins are available for styling: 44 45Custom property | Description | Default 46----------------|-------------|---------- 47`--paper-listbox-background-color` | Menu background color | `--primary-background-color` 48`--paper-listbox-color` | Menu foreground color | `--primary-text-color` 49`--paper-listbox` | Mixin applied to the listbox | `{}` 50 51### Accessibility 52 53`<paper-listbox>` has `role="listbox"` by default. A multi-select listbox will also have 54`aria-multiselectable` set. It implements key bindings to navigate through the listbox with the up and 55down arrow keys, esc to exit the listbox, and enter to activate a listbox item. Typing the first letter 56of a listbox item will also focus it. 57 58@group Paper Elements 59@element paper-listbox 60@hero hero.svg 61@demo demo/index.html 62--> 63 64<dom-module id="paper-listbox"> 65 <template> 66 <style> 67 :host { 68 display: block; 69 padding: 8px 0; 70 71 background: var(--paper-listbox-background-color, --primary-background-color); 72 color: var(--paper-listbox-color, --primary-text-color); 73 74 @apply(--paper-listbox); 75 } 76 </style> 77 78 <content></content> 79 </template> 80 81 <script> 82 (function() { 83 Polymer({ 84 is: 'paper-listbox', 85 86 behaviors: [ 87 Polymer.IronMenuBehavior 88 ], 89 90 hostAttributes: { 91 role: 'listbox' 92 } 93 }); 94 })(); 95 </script> 96</dom-module> 97
