simple-react-state

A simple react state manager based on react hooks and react-redux which makes working with both local and global states completely painless it also works pretty well with nested states.

Installing

yarn add https://github.com/yezyilomo/simple-react-state

Getting Started

Using local state

import React from 'react';
import { useLocalState } from 'simple-react-state';


function UserInfo(props){
    const [user, updateUser] = useLocalState({email: ""})

    let setUserEmail = (e) => {
        updateUser({
            field: 'email',
            value: e.target.value
        });
    }

    return (
        <div>
            User Email: {user.email}
            <br/>
            <input type="text" name="email" value={user.email} onChange={setUserEmail} />
        </div>
    );
}

const App = <UserInfo/>
ReactDOM.render(App, document.querySelector("#root"));

Using global state

import React from 'react';
import {
    Provider, configureStore, useGlobalState
} from 'simple-react-state';


let initialState = {
    user: {
        email: ""
    }
};

let store = configureStore({
    initialState: initialState
});

function UserInfo(props){
    const [user, updateUser] = useGlobalState('user');

    let setUserEmail = (e) => {
        updateUser({
            field: 'email',
            value: e.target.value
        });
    }

    return (
        <div>
            User Email: {user.email}
            <br/>
            <input type="text" name="email" value={user.email} onChange={setUserEmail} />
        </div>
    );
}

const App = <Provider store={store}><UserInfo/></Provider>
ReactDOM.render(App, document.querySelector("#root"));

API

useLocalState hook

useLocalState works just like useState hook, it accepts initial state as an argument except it returns an array of local state and updateState function(not setState like in useState hook).

let user = {
    name: 'Yezy',
    age: 24,
    account: {
        id: '23334',
        balance: 433.3
    }
}

[user, updateUser] = useLocalState(user)

useGlobalState hook

useGlobalState works just like useState hook too but it accepts a selection string and returns an array of three items which are state, updateState and dispatch, in most cases you will be using the first two items(state and updateState), the last item(dispatch) is for dispatching custom actions if you will have any. For example if you have a store with data like

{
    user: {
        name: 'Yezy',
        age: 24,
        account: {
            id: '23334',
            balance: 433.3
        }
    }
}

you can use useGlobalState hook to select a deeply nested state like

[age, updateAge, dispatch] = useGlobalState('user.age')

[account, updateAccount, dispatch] = useGlobalState('user.account')

[balance, updateBalance, dispatch] = useGlobalState('user.account.balance')

Note: If you pass nothing to useGlobalState the whole store is selected.

updateState

updateState function works the same on both useGlobalState and useLocalState hooks, it dispatches an action to perform update on state, an action dispatched should have the following format

updateState({
    type: 'update type',
    field: 'your field',
    value: 'your value'
})

where type can be ASSIGN, PUSH, POP, REMOVE or FILTER, ASSIGN is for assigning a value to a field, PUSH, POP, REMOVE and FILTER are for arrays(correspond with array methods).

ASSIGN is the default action type, so if you haven't passed the type of your action that one will be used, therefore with this in mind

updateUser({
    field: 'email',
    value: 'user@email.com'
})

is the same as

updateUser({
    type: 'ASSIGN',
    field: 'email',
    value: 'user@email.com'
})

setState

simple-react-state allows you to set global state with setState method from store object, setState works just like updateState in fact they are both using the same reducer(updateReducer), so all action types supported by updateState are also supported by setState too. Here is how to use it

store.setState({
    type: 'ASSIGN',
    field: 'your field',
    value: 'your value'
});

Note: This should be used outside of your component.

With this in mind the first example above could be re-written to

import React from 'react';
import {
    Provider, configureStore,
    useGlobalState, useLocalState
} from 'simple-react-state';


let store = configureStore({});

store.setState(
    type: 'ASSIGN',
    field: 'user',
    value: {email: ''}
)

function UserInfo(props){
    const [user, updateUser] = useGlobalState('user');

    let setUserEmail = (e) => {
        updateUser({
            type: 'ASSIGN',
            field: 'email',
            value: e.target.value
        });
    }

    return (
        <div>
            User Email: {user.email}
            <br/>
            <input type="text" name="email" value={user.email} onChange={setUserEmail} />
        </div>
    );
}

const App = <Provider store={store}><UserInfo/></Provider>
ReactDOM.render(App, document.querySelector("#root"));

Pretty cool, right?