Index: bower_components/core-localstorage/core-localstorage.html |
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-<!-- |
-Copyright (c) 2014 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 |
---> |
- |
-<!-- |
-Element access to localStorage. The "name" property |
-is the key to the data ("value" property) stored in localStorage. |
- |
-`core-localstorage` automatically saves the value to localStorage when |
-value is changed. Note that if value is an object auto-save will be |
-triggered only when value is a different instance. |
- |
- <core-localstorage name="my-app-storage" value="{{value}}"></core-localstorage> |
- |
-@group Polymer Core Elements |
-@element core-localstorage |
-@blurb Element access to localStorage. |
-@url github.io |
-@categories Data |
---> |
- |
-<link rel="import" href="../polymer/polymer.html"> |
- |
-<polymer-element name="core-localstorage" attributes="name value useRaw autoSaveDisabled" hidden> |
-<script> |
- |
- Polymer('core-localstorage', { |
- |
- /** |
- * Fired when a value is loaded from localStorage. |
- * @event core-localstorage-load |
- */ |
- |
- /** |
- * The key to the data stored in localStorage. |
- * |
- * @attribute name |
- * @type string |
- * @default null |
- */ |
- name: '', |
- |
- /** |
- * The data associated with the specified name. |
- * |
- * @attribute value |
- * @type object |
- * @default null |
- */ |
- value: null, |
- |
- /** |
- * If true, the value is stored and retrieved without JSON processing. |
- * |
- * @attribute useRaw |
- * @type boolean |
- * @default false |
- */ |
- useRaw: false, |
- |
- /** |
- * If true, auto save is disabled. |
- * |
- * @attribute autoSaveDisabled |
- * @type boolean |
- * @default false |
- */ |
- autoSaveDisabled: false, |
- |
- attached: function() { |
- // wait for bindings are all setup |
- this.async('load'); |
- }, |
- |
- valueChanged: function() { |
- if (this.loaded && !this.autoSaveDisabled) { |
- this.save(); |
- } |
- }, |
- |
- load: function() { |
- var v = localStorage.getItem(this.name); |
- if (this.useRaw) { |
- this.value = v; |
- } else { |
- // localStorage has a flaw that makes it difficult to determine |
- // if a key actually exists or not (getItem returns null if the |
- // key doesn't exist, which is not distinguishable from a stored |
- // null value) |
- // however, if not `useRaw`, an (unparsed) null value unambiguously |
- // signals that there is no value in storage (a stored null value would |
- // be escaped, i.e. "null") |
- // in this case we save any non-null current (default) value |
- if (v === null) { |
- if (this.value != null) { |
- this.save(); |
- } |
- } else { |
- try { |
- v = JSON.parse(v); |
- } catch(x) { |
- } |
- this.value = v; |
- } |
- } |
- this.loaded = true; |
- this.asyncFire('core-localstorage-load'); |
- }, |
- |
- /** |
- * Saves the value to localStorage. |
- * |
- * @method save |
- */ |
- save: function() { |
- var v = this.useRaw ? this.value : JSON.stringify(this.value); |
- localStorage.setItem(this.name, v); |
- } |
- |
- }); |
- |
-</script> |
-</polymer-element> |