How to Connect React Application with Redux

How to Connect React Application with Redux

This post will be helpful for React developers in integrating React applications with Redux.

This post will be helpful for React developers in integrating React applications with Redux. We will create a basic React.js project and go through integrating Redux step-by-step.

Project Setup

Now the first thing to do is to create a React Project so that we can use our Redux library there. We can do this by using create-react-app.

Go to your terminal and type in the commands:

Now your sample React project will be up and running on localhost:3000

This is a simple React application setup where you will have all the basic dependencies for your React app. To connect your React component with the Redux Store we need to install some libraries and those libraries are:

  • Redux | Command

  • React-Redux | Command

Creating a Store and Connecting it With the Component

Where do we create a store? Well for me it is always at index.js because there we have the very root component App from where we can pass on the States from the Store.

So the first thing we do here is to create Store and for that we will import

And then we will create a Store

As we need to pass reducer on createStore(), we will be creating a Reducer file where we will define our actions.

Reducer.js | Basic

Here we created a basic reducer with state which is returning the state as it is.

Now we need to connect our store to our React application and we want to get access to the state in our component so that we do something useful.

Let’s connect our Store here with the Component.

Because Redux is an independent library and we need to connect it with React, we will be importing Provider from the react-redux library inside the same index.js file.

And now we need to wrap the Root component (which is in our case) with the Provider. It allows us to pass our store which contains the state into the React component. You can pass it the same way you pass the properties in the React component.

We will pass it with the property name store and passing the information coming from our Reducer which we have also named as store.

App.js File

This file is responsible for all the UI element. On this page we will be performing our basic tasks like Increment, decrement, add, substract, reset. Now I have used bootstrap here to create some UI element but will not be discussing it in this article since this is not in the scope of our topic.

importReact, { Component } from'react';
import'./App.css';
import { connect } from'react-redux'
import { Container, Card, Button,Row,Col } from'reactstrap'
classAppextendsComponent {
state = {
info :''
}
render() {
return (
<ContainerclassName="mt-5">
<div>
<Cardstyle={{"width":"350px" , "margin" :"0 auto" , "float" :"none", "marginBottom":"10px"}}>
<Card><pclassName="text-center mt-2">{this.props.value}</p></Card>
<RowclassName = "mt-3">
<Colmd="6"xs="6"sm="6"style={{"textAlign" :"right"}}>
<ButtonclassName="ml-1"onClick={()=>this.props._onInc()}>Increment</Button>
</Col>
<Colmd="6"xs="6"sm="6">
<ButtonclassName="ml-1"onClick={()=>this.props._onDec()}>Decrement</Button>
</Col>
</Row>
<RowclassName = "mt-1">
<Colmd="6"xs="6"sm="6"style={{"textAlign" :"right"}}>
<ButtonclassName="ml-1" >
</Col>
<Colmd="6"xs="6"sm="6">
<ButtonclassName="ml-1"style={{"width":"104px"}}onClick={()=>this.props._onSub()}>Subtract 3</Button>
</Col>
</Row>
<RowclassName = "mt-1 text-center">
<Colmd="12"xs="12"sm="12">
<ButtonclassName="ml-1 mb-2"onClick={()=>this.props._onReset()}>Reset</Button>
</Col>
</Row>
</Card>
</div>
</Container>
);
}
}
constmapStateToProps = (state) =>{
return {
state :state
}
}
constmapDispatchToProps = (dispatch) =>{
return{
      _onInc : () =>{
dispatch({
type :"ON_INCREMENT",
value :1
})
},
_onDec : () =>{
dispatch({
type :"ON_DECREMENT",
value :1
})
},
_onAdd : () =>{
dispatch({
type :"ON_ADD",
value :3
})
},
_onSub : () =>{
dispatch({
type :"ON_SUBTRACT",
value :3
})
},
_onReset : () =>{
dispatch({
type :"ON_RESET",
value :0
})
  }
   }
}
exportdefaultconnect(mapStateToProps,mapDispatchToProps)(App);

So far, we don’t have access to our store directly inside the component. For this, we need to connect our component with the Store by importing connect from react-redux.

import { connect } from'react-redux'

connect is a method which returns a function which then takes a component as an input. So, in short, it’s a function that returns a higher order component, and, since connect is a function, we can pass the argument as the configuration for the component.

Basically, we pass two arguments:

  • The exact state we want.
  • The action wewant to dispatch.

mapStateToProps

Now we want to get state and for that we will declare a constant after the class declaration. Here we will map the state which is stored at store to the props

constmapStateToProps = (state) =>{
return {
value:state.value
}
}

We have called this state as props (named as value) in our application above. The state here is the same state (global state) we have defined in the reducer.

<Card><pclassName="text-center mt-2">{this.props.value}</p></Card>

mapDispatchToProps

Here we can define which kind of action we can dispatch. It will receive dispatch as an argument and where it will return a JavaScript Object on which we can dispatch an action which has information like type and value (payload).

constmapDispatchToProps = (dispatch) =>{
return{
_onInc : () =>{
dispatch({
type :"ON_INCREMENT",
value :1
})
}
}
}

Reducer.js File

Here we have defined different cases for different actions that we are performing in the App.js file and this again can pass the updated states to the store and then the store will be available to all of our components through connect (react-redux).

If you have any questions that remains unanswered, then this post on React can be really helpful.

Thank you!

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