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Introduction to React Portals

Web development, programming languages, Software testing & others

Syntax:

We can see the simple syntax below where we are passing the child and the container. Here We have passed two attributes to the ReacDOM.createPortal function out of which first is the renderable child component. We can create a react Portal with the help of the below syntax.

ReacDOM.createPortal (the Child goes here, the container goes here) How do Portals Work in React?

Before going into a deeper analysis of the working of the portal we need to understand in which situations we need to use the concept of the portal. You have seen many times an overflow happens while displaying the component, it happens because the child components may not be inside the actual node of the component. with the help of the portal, we can directly insert the child component inside another component and it will handle the overflow condition. We pass the two attributes at the time of the creation of the portal, out of which the first is the child and second is the container. Here the first attribute which child is any renderable components (renderable means it can be rendered and can be visible to the end-users )

Examples of React Portals

Below we have written an example, this example contains three sections: the first section is the HTML section, the second is the JavaScript section and 3rd section is the CSS sections. let us understand each section for the implementation of the portal concept in the react js. In case if we want to run the below example we can create an HTML file and we can put html css and javascript all together with required dependency and we can run the examples or we can use some online react compilers and we can execute the below examples.

Example #1 – Html contents Example #2 – Javascriptcontents Example #3 – First components, used for the popups

//Here we are creating a component which will display in the form of the popups and we can also include some text messages on this model

class Pop extends React.Component { constructor(props) { super(props) this.element = document.createElement('div') } componentDidMount() { document.getElementById('popup').appendChild(this.element) } componentWillUnmount() { document.getElementById('popup').removeChild(this.element) } render() { return ReactDOM.createPortal( this.props.children, this.element ) } }

The main component and second component or default components, this component contains the child component of pop-ups.

class Portalexample extends React.Component { constructor(props) { super(props) this.state = {showhideModel: false} this.manageShowHide = this.manageShowHide.bind(this) this.manageHide = this.manageHide.bind(this) } manageShowHide() { this.setState({showhideModel: true}) } manageHide() { this.setState({showhideModel: false}) } render() { constshowpopups = this.state.showhideModel ? ( ) : '' return ( {showpopups} ) } } Example #4 – CSS Contents #popup { position: fixed; z-index: 997; } /* popup designing with css is goes here */ #popup div { background-color: green; /* Defining the height of the popups */ height: 99%; /* Defining the position of the popups */ position: fixed; top: 0; /* Defining the display of the popups */ display: flex; align-items: center; left: 0; /* Defining the width of the popups * width: 99%; justify-content: center; }