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Introduction to React componentWillMount()

Web development, programming languages, Software testing & others

Syntax:

In the below syntax we have created a simple syntax for the componentWillMount() function in react js.

Before performing any activity the first thing they will call is the constructor and then call for the componentWillMount() function.

Inside this function we can perform some of the important activities like modification of html view for the end users etc .

Next thing will be called to render, as we have already done some modification in the componentWillMount() section the changed value will be displayed at the user end.

componentWillMount() { } render(){ } How componentWillMount() works in React?

You have seen the web applications, when you open any site the first time the web application open and you will see some contents, in case suppose you open the web application and due to some reason the data which we fetched from server is not suitable to display to end user, so in that case we will use the function componentWillMount(). This function always execute before the execution of the render and we know that render play the role of displaying of data to the end users.

We can see the working of the componentWillMount() with the help of some of the below points:

First thing happens when component loaded and loaded component will call first to the state initialization then it will start with the other activity.

Second thing it will perform is, it will call to the componentWillMount() function and inside this function we can perform some of the important things, like modification of the data coming from the server to display better contents to the customer, and we can change some static data also to display for the end users.

Finally the main function of the react will be called render function, as we know the main purpose of the render function in the react js is to display for the end users.

We can take some examples also to elaborate it in the better way, suppose you have an ecommerce website and customer is browsing products on the site and in case some of products are out of stock in that case we can check the products which are visible to customer and check the product counts and if it is less then we can control it’s view by adding any specific message for this product as there is less remain something else.

Example of React componentWillMount()

React JavaScript Code:

class Species extends React.Component { constructor(props) { super(props); this.state = { sp: undefined } } componentWillMount() { let sp; sp = 'Dog'; sp = 'Dog' } else { sp = 'Not known' } this.setState({ sp }); } render() { return ( {this.props.type} is a {this.state.sp} ); } } document.querySelector(".test-class"));

HTML Code:

This is the html code to display the above react component for end users:

CSS Code:

.test-class { height: 99%; width:99%; .block { background-color: yellow; color: red; padding: 18px; border: 10px solid green; h2 { font-size:22px; } } }

Output:

Advantages

It allows us to modify the contents before displaying to the end user, which creates a better impression to the end user, otherwise anything can be displayed to the end user.

Because it is a react system defined method, if we want to achieve the same functionality with the help of writing any custom function then it will not be able to give us the same performance as it is part of the react lifecycle and hence it is optimized.

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