a1a3bc73
 Luigi Serra
graphs updates
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<!---
This README is automatically generated from the comments in these files:
iron-localstorage.html
Edit those files, and our readme bot will duplicate them over here!
Edit this file, and the bot will squash your changes :)
-->
[](https://travis-ci.org/PolymerElements/iron-localstorage)
_[Demo and API Docs](https://elements.polymer-project.org/elements/iron-localstorage)_
##<iron-localstorage>
Element access to Web Storage API (window.localStorage).
Keeps `value` property in sync with localStorage.
Value is saved as json by default.
### Usage:
`ls-sample` will automatically save changes to its value.
<dom-module id="ls-sample">
<iron-localstorage name="my-app-storage"
value="{{cartoon}}"
on-iron-localstorage-load-empty="initializeDefaultCartoon"
></iron-localstorage>
</dom-module>
<script>
Polymer({
is: 'ls-sample',
properties: {
cartoon: {
type: Object
}
},
// initializes default if nothing has been stored
initializeDefaultCartoon: function() {
this.cartoon = {
name: "Mickey",
hasEars: true
}
},
// use path set api to propagate changes to localstorage
makeModifications: function() {
this.set('cartoon.name', "Minions");
this.set('cartoon.hasEars', false);
}
});
</script>
### Tech notes:
* `value.*` is observed, and saved on modifications. You must use
path change notifification methods such as `set()` to modify value
for changes to be observed.
* Set `auto-save-disabled` to prevent automatic saving.
* Value is saved as JSON by default.
* To delete a key, set value to null
Element listens to StorageAPI `storage` event, and will reload upon receiving it.
**Warning**: do not bind value to sub-properties until Polymer
[bug 1550](https://github.com/Polymer/polymer/issues/1550)
is resolved. Local storage will be blown away.
`<iron-localstorage value="{{foo.bar}}"` will cause **data loss**.
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