A local state middleware for virtex components
npm install virtex-local
A local state middleware for virtex components
$ npm install virtex-local
First, you need to install it in your redux middleware stack before virtex-component. E.g.
applyMiddleware(local('app'), component, dom(document), ...others)
The 'app' string passed to virtex-local tells it where in your global state atom your component state tree will be mounted. In this case, state.app is where it will live. In order for this to work, you will also need to mount redux-ephemeral into your reducer at the same key, like this:
``javascript
import {mount} from 'virtex-local'
export default mount('app', reducer)
`
When using virtex-local, your components will receive three extra things in their model:
* local - Wraps actions that you want to direct to your local reducer.state
* - Your components local state.
`javascript
import element from 'virtex-element'
function render ({local, state}) {
return (
The text in your input is {state.text}
)
}
const SET_TEXT = 'SET_TEXT'
function setText (e) {
const text = e.currentTarget.value
return {
type: SET_TEXT,
payload: text
}
}
function reducer (state, action) {
switch (action.type) {
case SET_TEXT:
return {
...state,
text: action.payload
}
}
return state
}
export default {
render,
reducer
}
`
There is a second argument you may pass to the virtex-local middleware when you install it, dirty. If you pass this argument, virtex-local will maintain a map of the dirty state of your components. This can be useful for implementing partial subtree re-rendering optimizations. E.g.
`javascript
const dirty = {}
applyMiddleware(local('app', dirty), ...)
function update (state) {
Object.keys(dirty).forEach(key => rerenderSubtree(key)))
}
``
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