React Transition Handler

It is a tiny React library for managing transition between Components, Redux Connected Components or React-Router v4 made up by two add-on components:

• TransitionReplace
• Switch

Examples at https://antoniopangallo.github.io/react-transition-handler/.

Installation

To install, you can use npm:

$ npm i react-transition-handler --save

TransitionReplace

It is an add-on component for easily performing any type of transition when a react component is going to replace (enters or leaves the DOM) another.

Transitions are fully configurable through CSS.

Props

className: String

The class name of your transition. It may be even set directly into the Switch Component

classNameWrapper: String

If passed as prop it will be used instead of the default wrapper's inline style.

<div style="height: 100%; width: 100%; position: relative; top: 0px; left: 0px; overflow: hidden;"> .... </div>

<div class="classNameWrapper"> .... </div>

style: Object

If passed as prop it will override the default wrapper's inline style.

onEnter: Function(element: [Component, HtmlElement])

Callback fired as soon as the transition for the entering component has been completed.

onEntering: Function(element: [Component, HtmlElement])

Callback fired as soon as the transition for the entering component is going to start.

onLeave: Function(element: [Component, HtmlElement])

Callback fired as soon as the transition for the leaving component has been completed.

onLeaving: Function(element: [Component, HtmlElement])

Callback fired as soon as the transition for the leaving component is going to start.

If you are using either React Router V4 or Functional Stateless Components, element's type will be HtmlElement for all the functions listed above

Low-level API: TransitionReplace

When a child is going to enter or leave a lifecycle hooks function is called on it.

import React from "react";
export default class Child extends React.Component {
    componentWillLeave() {}
    componentWillEnter() {}
    componentDidLeave() {}
    componentDidEnter() {}

    render() {
        return <div />
    }
  }

Lifecycle hooks described above as the onEntering - onEnter - onExiting and onExit functions are not available if you are using TransitionReplace to perform transitions either between Routes in React Router v4 or Stateless Functional Components

Switch

Who is in charge to handle the replacement between components is the Switch add-on. Switch is a controlled react component that by using the history object which it provides, allowes to decide which of its children must be rendered.

By default the first child will be rendered.

Props

onHistory: Function

Callback fired as soon the Switch component is mounted.

this.onHistory = history => (this.history = history);

The history object provides 3 methods for moving across the Switch children.

this.history.push(value: [String, Number], [callback]); 
// value must be either a numeric id of the child from 0 to N or a the tag String passed as prop to the child Component
this.history.goForward([callback]);
this.history.goBack([callback]);

The callback is an optional function that will be executed once either push - goForward or goBack is completed.

this.history.push("child1", (child) => {
    console.log(child);
});

More about history: a history object instance will be passed as props to the children, so you can use the methods within the component

onChange: Function

Callback fired as soon as the Switch state is going to be changed due to an action performed by the Switch history object.

this.onChange = switchState => this.setState({ switchState });

onEnter: Function

Callback fired as soon as a Switch component child is mounted.

this.onEnter = component => { component.someFunction() };

onLeave: Function

Callback fired as soon as a Switch component child is unmounted.

this.onLeave = component => { component.someFunction() };

switchState: Object

The state must be initialized by using the static create method provided by the Switch component

const switchState = Switch.create(id: [String, Number]);
// or
const switchState = Switch.create();

switchState object contains the Switch's state and it could be used for getting only read access on the Switch state.

className: String

The class name of your transition.

Get Started - TransitionReplace

Basic Usage

import React, { Component } from "react";
import { TransitionReplace, Switch } from "react-transition-handler";

const Child = props => <div className={props.className}>{props.content}</div>;

export default class GetStarted extends Component {
    constructor(props) {
        super(props);
        this.state = { switchState: Switch.create("switchState") };
        this.onChange = switchState => {
            this.setState({ switchState });
        };
        this.onHistory = history => (this.switchHistory = history);
    }
    
    componentDidMount() {
        // it renders the child whit tag="child3"
         this.switchHistory.push("child3", (child) => {
            // Run after child3 has completed the transition
            this.switchHistory.goForward();
        });
    }

    render() {
        const { switchState } = this.state;
        // In order to get the key you must use the getKey static method
        // provided by the Switch component
        const key = Switch.getKey(switchState);
        return (
           <TransitionReplace
            classNameWrapper="transition-replace"
            className="swap-transition">
                <Switch
                    switchState={switchState}
                    onChange={this.onChange}
                    onHistory={this.onHistory}
                    key={key}
                >
                    <Child className="child child1" tag="child1" content="content1" />
                    <Child className="child child2" tag="child2" content="content2" />
                    <Child className="child child3" tag="child3" content="content3" />
                </Switch>
            </TransitionReplace>
        );
    }
}

CSS Transition BASIC

.transition-replace {
    position: relative;
    height: 300px;
    width: 300px;
    overflow: hidden;
}
.swap-transition {
    position: absolute;
    height: 100%;
    width: 100%;
    top: 0;
    left: 0;
    transition: transform 1s ease-in-out;
}

.swap-transition-leave-from, .swap-transition-enter-to {
    transform: translate3d(0, 0, 0);
}

.swap-transition-leave-to {
    transform: translate3d(-100%, 0, 0);
}

.swap-transition-enter-from {
    transform: translate3d(100%, 0, 0);
}

.child {
    height: 300px;
    width: 300px;
}
.child1 {
    background: red;
}
.child2 {
    background: white;
}
.child3 {
    background: blue;
}

CSS Name Convention: as you can see in the example above a className prop swap-transition is passed to the TransitionReplace when a new child is about to enter it will get swap-transition-enter-from and swap-transition-enter-to CSS classes so you can use these classes to trigger a CSS transition for the entering component as you can do it for the leaving component swap-transition-leave-from and swap-transition-leave-to

Full convention

• ${className}-enter-from - ${className}-leave-from
• ${className}-enter-to - ${className}-leave-to
• ${className}-enter-to[data-transition="start"] - Transition started
• ${className}-leave-to[data-transition="start"] - Transition started
• ${className}-enter-to[data-transition="end"] - Transition ended
• ${className}-leave-to[data-transition="end"] - Transition ended

Advanced Usage - Nested Switch

import React, { Component } from "react";
import { TransitionReplace, Switch } from "react-transition-handler";

const Child = props => <div className={props.className}>{props.content}</div>;

export default class GetStarted extends Component {
    constructor(props) {
        super(props);
        this.state = { switchState: Switch.create("switchState"), switchStateInner: Switch.create("switchStateInner") };
        this.onChange = switchState => {
            this.setState({ [switchState.id]: switchState });
        };
        this.onHistory = history => (this.switchHistory = history);
        this.onHistoryInner = history => (this.switchHistoryInner = history);
    }
    
    componentDidMount() {
        // it renders the child whit tag="child3"
         this.switchHistory.push("innerSwitch", (child) => {
            // Run after child3 has completed the transition
            this.switchHistoryInner.goForward();
        });
    }

    render() {
         const { switchState, switchStateInner } = this.state;
        // In order to get the key you must use the getKey static method
        // provided by the Switch component
        const key = Switch.getKey(switchState, switchStateInner);
        return (
           <TransitionReplace
            classNameWrapper="transition-replace"
            className="swap-transition">
                <Switch
                    switchState={switchState}
                    onChange={this.onChange}
                    onHistory={this.onHistory}
                    key={key}
                >
                    <Child className="child child1" tag="child1" content="content1" />
                    <Child className="child child2" tag="child2" content="content2" />
                    <Child className="child child3" tag="child3" content="content3" />
                    <Switch
                        tag="innerSwitch"
                        switchState={switchStateInner}
                        onChange={this.onChange}
                        onHistory={this.onHistoryInner}
                        key={key}
                    >
                        <Child className="child child1" tag="child1" content="innerContent1" />
                        <Child className="child child2" tag="child2" content="innerContent2" />
                    </Switch>
                </Switch>
            </TransitionReplace>
        );
    }
}

.transition-replace {
    position: relative;
    height: 300px;
    width: 300px;
    overflow: hidden;
}

.swap-transition, .opacity-transition {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  left: 0;
}

.swap-transition {
  transition: transform 1s ease-in-out;
}

.swap-transition-leave-from, .swap-transition-enter-to {
  transform: translate3d(0, 0, 0);
}

.swap-transition-leave-to {
  transform: translate3d(-100%, 0, 0);
}

.swap-transition-enter-from {
  transform: translate3d(100%, 0, 0);
}

.opacity-transition {
  transition: opacity 1s ease-in-out;
}

.opacity-transition-leave-from, .opacity-transition-enter-to {
  opacity: 1;
}

.opacity-transition-leave-to, .opacity-transition-enter-from {
  opacity: 0;
}

.child {
    height: 300px;
    width: 300px;
}
.child1 {
    background: red;
}
.child2 {
    background: white;
}
.child3 {
    background: blue;
}

Advanced Usage - React Router v4

import React, { Component } from "react";
import { TransitionReplace } from "react-transition-handler";
import { Switch, Route } from 'react-router-dom';

const Home = props => <div>Home</div>;
const Page1 = props => <div>Page1</div>;

export default class GetStarted extends Component {
    render() {
        return (
            <Route render={({ location }) => (
                <TransitionReplace className="swap-transition">
                    <Switch key={location.pathname} location={location}>
                        <Route exact path='/' component={Home} />
                        <Route path='/page1' component={Page1} />
                    </Switch>
                </TransitionReplace>
                )} />
        );
    } 
}

Browser Support

| IE11 / Edge | Firefox | Chrome | Opera | Safari | iOS Safari | Chrome for Android | | --------- | --------- | --------- | --------- | --------- | --------- | --------- |

License

This software is free to use under the MIT license. See the LICENSE file for license text and copyright information.