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| 1 <!-- |
| 2 @license |
| 3 Copyright (c) 2015 The Polymer Project Authors. All rights reserved. |
| 4 This code may only be used under the BSD style license found at http://polymer.g
ithub.io/LICENSE.txt |
| 5 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt |
| 6 The complete set of contributors may be found at http://polymer.github.io/CONTRI
BUTORS.txt |
| 7 Code distributed by Google as part of the polymer project is also |
| 8 subject to an additional IP rights grant found at http://polymer.github.io/PATEN
TS.txt |
| 9 --><html><head><link rel="import" href="../polymer/polymer.html"> |
| 10 <link rel="import" href="../iron-resizable-behavior/iron-resizable-behavior.html
"> |
| 11 |
| 12 <!-- |
| 13 |
| 14 `iron-list` displays a virtual, 'infinite' list. The template inside |
| 15 the iron-list element represents the DOM to create for each list item. |
| 16 The `items` property specifies an array of list item data. |
| 17 |
| 18 For performance reasons, not every item in the list is rendered at once; |
| 19 instead a small subset of actual template elements *(enough to fill the viewport
)* |
| 20 are rendered and reused as the user scrolls. As such, it is important that all |
| 21 state of the list template be bound to the model driving it, since the view may |
| 22 be reused with a new model at any time. Particularly, any state that may change |
| 23 as the result of a user interaction with the list item must be bound to the mode
l |
| 24 to avoid view state inconsistency. |
| 25 |
| 26 __Important:__ `iron-list` must ether be explicitly sized, or delegate scrolling
to an |
| 27 explicitly sized parent. By "explicitly sized", we mean it either has an explici
t |
| 28 CSS `height` property set via a class or inline style, or else is sized by other |
| 29 layout means (e.g. the `flex` or `fit` classes). |
| 30 |
| 31 ### Template model |
| 32 |
| 33 List item templates should bind to template models of the following structure: |
| 34 |
| 35 { |
| 36 index: 0, // data index for this item |
| 37 item: { // user data corresponding to items[index] |
| 38 /* user item data */ |
| 39 } |
| 40 } |
| 41 |
| 42 Alternatively, you can change the property name used as data index by changing t
he |
| 43 `indexAs` property. The `as` property defines the name of the variable to add to
the binding |
| 44 scope for the array. |
| 45 |
| 46 For example, given the following `data` array: |
| 47 |
| 48 ##### data.json |
| 49 |
| 50 [ |
| 51 {"name": "Bob"}, |
| 52 {"name": "Tim"}, |
| 53 {"name": "Mike"} |
| 54 ] |
| 55 |
| 56 The following code would render the list (note the name and checked properties a
re |
| 57 bound from the model object provided to the template scope): |
| 58 |
| 59 <template is="dom-bind"> |
| 60 <iron-ajax url="data.json" last-response="{{data}}" auto></iron-ajax> |
| 61 <iron-list items="[[data]]" as="item"> |
| 62 <template> |
| 63 <div> |
| 64 Name: <span>[[item.name]]</span> |
| 65 </div> |
| 66 </template> |
| 67 </iron-list> |
| 68 </template> |
| 69 |
| 70 ### Resizing |
| 71 |
| 72 `iron-list` lays out the items when it recives a notification via the `resize` e
vent. |
| 73 This event is fired by any element that implements `IronResizableBehavior`. |
| 74 |
| 75 By default, elements such as `iron-pages`, `paper-tabs` or `paper-dialog` will t
rigger |
| 76 this event automatically. If you hide the list manually (e.g. you use `display:
none`) |
| 77 you might want to implement `IronResizableBehavior` or fire this event manually
right |
| 78 after the list became visible again. e.g. |
| 79 |
| 80 document.querySelector('iron-list').fire('resize'); |
| 81 |
| 82 |
| 83 @group Iron Element |
| 84 @element iron-list |
| 85 @demo demo/index.html |
| 86 --> |
| 87 |
| 88 </head><body><dom-module id="iron-list"> |
| 89 <style> |
| 90 |
| 91 :host { |
| 92 display: block; |
| 93 } |
| 94 |
| 95 :host(.has-scroller) { |
| 96 overflow: auto; |
| 97 } |
| 98 |
| 99 :host(:not(.has-scroller)) { |
| 100 position: relative; |
| 101 } |
| 102 |
| 103 #items { |
| 104 position: relative; |
| 105 } |
| 106 |
| 107 #items > ::content > * { |
| 108 width: 100%; |
| 109 box-sizing: border-box; |
| 110 position: absolute; |
| 111 top: 0; |
| 112 will-change: transform; |
| 113 } |
| 114 |
| 115 </style> |
| 116 <template> |
| 117 |
| 118 <array-selector id="selector" items="{{items}}" selected="{{selectedItems}}"
selected-item="{{selectedItem}}"> |
| 119 </array-selector> |
| 120 |
| 121 <div id="items"> |
| 122 <content></content> |
| 123 </div> |
| 124 |
| 125 </template> |
| 126 </dom-module> |
| 127 |
| 128 <script src="iron-list-extracted.js"></script></body></html> |
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Chromium Code Reviews
Issue 1351623008:
MD Settings: Languages model for language pages (Closed)
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