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Update persistient-form docs

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Dan Finlay 2016-08-25 14:03:34 -07:00
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docs/form_persisting_architecture.md
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@ -8,28 +8,21 @@ Since:
This calls for an architecture of a form component that can completely persist its values to LocalStorage on every relevant change, and restore those values on reopening.
Whenever this class is loaded, it registers an `onChange` listener. On those events, it checks the target for a special ID attribute it listens for.
To achieve this, we have defined a class, a subclass of `React.Component`, called `PersistentForm`, and it's stored at `ui/lib/persistent-form.js`.
Let's say we call our class `PersistentForm`. So then we might check for a `persistent-form-id` on change.
To use this class, simply take your form component (the component that renders `input`, `select`, or `textarea` elements), and make it subclass from `PersistentForm` instead of `React.Component`.
The parent element will define a special attribute, let's say `persistent-form-parent-id`.
You can see an example of this in use in `ui/app/first-time/restore-vault.js`.
Here's some pseudo-code for it:
```
onChange(ev) =>
persisted = localStorage[parentKey]
persisted[childKey] = ev.value
localStorage[parentKey] = persisted
```
On startup, we just do the inverse:
```
onStart() =>
el = this.getEl()
parentKey = el.attr('persistent-form-parent-id')
children = el.children.where('[persistent-form-id]')
children.each(loadValue)
Additionally, any field whose value should be persisted, should have a `persistentFormId` attribute, which needs to be assigned under a `dataset` key on the main `attributes` hash. For example:
```javascript
return h('textarea.twelve-word-phrase.letter-spacey', {
dataset: {
persistentFormId: 'wallet-seed',
},
})
```
That's it! This field should be persisted to `localStorage` on each `keyUp`, those values should be restored on view load, and the cached values should be cleared when navigating deliberately away from the form.