How to update nested state properties in ReactJS?
Last Updated :
28 Dec, 2020
There are the following approaches to update nested state properties in ReactJS:
- Approach 1: We can create a dummy object to perform operations on it (update properties that we want) then replace the component’s state with the updated object.
- Approach 2: We can pass the old nested object using the spread operator and then override the particular properties of the nested object.
Creating React Application:
Step 1: Create a React application using the following command:
npx create-react-app foldername
Step 2: After creating your project folder i.e. foldername, move to it using the following command:
cd foldername
Project Structure: It will look like the following.
Project Structure
Approach 1: App.js
Javascript
import React, { Component } from "react";
class App extends Component {
state = {
name: 'kapil',
address: {
colony: 'vaishnav nagar',
city: 'Jaipur',
state: 'Rajasthan'
}
};
handleUpdate = () => {
var address = { ...this.state.address }
address.city = 'Kota';
this.setState({ address })
}
render() {
return (
<div style={{ margin: 200 }}>
<h1>{this.state.name}</h1>
<h1>{this.state.address.colony} {","}
{this.state.address.city}{", "}
{this.state.address.state}</h1>
<button
onClick={this.handleUpdate}
>UpdateCity </button>
</div>
);
}
}
export default App;
|
Approach 2: App.js
Javascript
import React, { Component } from "react";
class App extends Component {
state = {
name: 'kapil',
address: {
colony: 'vaishnav nagar',
city: 'Jaipur',
state: 'Rajasthan'
}
};
handleUpdate = () => {
this.setState({ address: { ...this.state.address, city: "kota" } })
}
render() {
return (
<div style={{ margin: 200 }}>
<h1>{this.state.name}</h1>
<h1>{this.state.address.colony} {","}
{this.state.address.city}{", "}
{this.state.address.state}</h1>
<button
onClick={this.handleUpdate}
>UpdateCity </button>
</div>
);
}
}
export default App;
|
Step to Run Application: Run the application using the following command from the root directory of the project:
npm start
Output:
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