redux-weapp

Redux-based State Management for Wechat applet(微信小程序, weapp), to connect Redux store with your weapp's App or Page lifecycles.

Install

# via Github
npm install xixilive/redux-weapp --save-dev

# via npm
npm install redux-weapp --save-dev

# via yarn
yarn add -D redux-weapp

Build

git clone https://github.com/xixilive/redux-weapp.git \
  && cd redux-weapp \
  && yarn \
  && yarn build

Usage

Before trying these demo code snippets, you should/must be experienced in weapp modulize development. 微信小程序模块化开发实践

// Redux store
import {createStore} from 'redux'
//create your Redux store
const store = createStore(...)

connect to weapp App

import connect from 'redux-weapp'
const config = connect.App(
  store,
  //to map next state into your app
  (state) => {
    // must return an object, which will be passed to onStateChange function
    return {}
  },
  // to bind dispatch with your action,
  // and this binding will be injected into your app object.
  (dispatch) => {
    // return an object, which can be invoked within app context(this scope).
    return {}
  }
)({
  onLaunch(options){},
  //...,
  onStateChange(nextState, prevState, initFlag){
    this.setData({...this.data, ...nextState})
  }
})
 
// construct your app
App(config)

connect to weapp Page

Assume we have a store shape as following:

{
  "todos": [
    {
      "title": "String",
      "complete": "Boolean"
    }
  ]
}

and we have defined an action creator(FSA) as:

const fetchTodosAction = (status) => ({type: 'FETCH_TODOS', filter: {status}})

Ok, let's connect store to todo-list page.

// 
import connect from 'redux-weapp'
 
const config = connect.Page(
  store,
  //to map next-state into your page
  (state) => ({todos: state.todos}),
 
  // to bind dispatch with your action creators,
  // and this binding will be injected into your page object
  (dispatch) => ({
    fetchTodos(status = 'inprogress'){
      // dispatch an action
      dispatch(fetchTodosAction(status))
    }
  })
)({
  onLoad(options){
    this.fetchTodos('inprogress')
  },
  
  onStateChange(nextState, prevState, initFlag){
    const {todos} = nextState
    this.setData({todos}) // to update UI
  },
 
  // view interactions
  onTapCompleteTab(){
    this.fetchTodos('complete')
  },
 
  onTapInProgressTab(){
    this.fetchTodos('inprogress')
  }
})
 
// construct your page
Page(config)

connect API

connect.App

//define app connect function
factory = connect.App(
  store:ReduxStore, 
  mapStateToProps:Function(state:Object), 
  mapDispatchToProps:Function(dispatch:Function)
):Function
 
//build a store-binding app config object
config = factory({
  onLaunch(options:Object){},
  onStateChange(nextState:Object, prevState:Object, initFlag:Any),
  //...
}):Object
 
//launch app with store-binding config
App(config)

connect.Page

//define page connect function
factory = connect.Page(
  store:ReduxStore, 
  mapStateToProps:Function(state:Object), 
  mapDispatchToProps:Function(dispatch:Function)
):Function
 
//build a store-binding page config object
config = factory({
  onLoad(options:Object){},
  onStateChange(nextState:Object, prevState:Object, initFlag:Any)
  //...
}):Object
 
//start page instance with store-binding config
Page(config)

the onStateChange function

// would be called after each concerned state changed
onStateChange(nextState:Object, prevState:Object, initFlag:Any):void

• initFlag: new feature from redux-weapp@0.2.x, see Changes section for details.

Changes from v0.2.x

connect.App API

• removed appLaunchOptions argument from mapState function.

// v0.1.x
connect.App({
  store:ReduxStore,
  mapState:Function(state:Object, appLaunchOptions:Object):Object,
  mapDispatch:Function(dispatch:Function):Object,
})
 
// v0.2.x
connect.App({
  store:ReduxStore,
  mapState:Function(state:Object):Object,
  mapDispatch:Function(dispatch:Function):Object,
})

connect.Page API

• removed pageLoadOptions argument from mapState function.

// v0.1.x
connect.Page({
  store:ReduxStore,
  mapState:Function(state:Object, pageLoadOptions:Object):Object,
  mapDispatch:Function(dispatch:Function):Object,
})
 
// v0.2.x
connect.Page({
  store:ReduxStore,
  mapState:Function(state:Object):Object,
  mapDispatch:Function(dispatch:Function):Object,
})

onStateChange callback

• add initFlag as the 3rd argument, which could be a string value INIT_SYNC just on the very first dispatch, undefined otherwise.

// v0.1.x
onStateChange(nextState:Object, prevState:Object)
 
// v0.2.x
onStateChange(nextState:Object, prevState:Object, initFlag:Any)

Lifecycles

for weapp App

• onLaunch

setup an subscribe listener when onLaunch function called, and the initial store state will be broadcasted.

• onShow

An inactive listener will be set to active when onShow function has called, and the listener will be called with last state.

• onHide

An active listener will be set to inactive when onHide function has called.

for weapp Page

• onLoad

setup an subscribe listener when onLoad function called, and the initial store state will be broadcasted.

• onShow

An inactive listener will be set to active when onShow function has called, and the listener will be called with last state.

• onHide

An active listener will be set to inactive when onHide function has called.

• onUnload

The listener will be remove when onUnload function has called.

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Good luck!