Tips for automatically activating a CSS animation each time a react component re-renders

Question

Tips for automatically activating a CSS animation each time a react component re-renders

I am trying to implement an animation on a react component that triggers every time it re-renders due to prop changes:

react:

function Card({ cardText }) {
  return <div className="roll-out">{cardText}<div/>
}

Here's the CSS I used:

@keyframes rollout {
  0% { transform: translateY(-100px); }
  100% { transform: none; }
}

.roll-out {
  animation: rollout 0.4s;
}

However, I'm facing an issue where the animation only plays once, during the initial render. I want it to play every time <Card /> re-renders due to changes in cardText. How can this be achieved?

css reactjs

Answer 1

Answer №1

To improve efficiency, insert a unique key into your code:

function Card({ cardText }) {
  return <div key={cardText} className="roll-out">{cardText}<div/>
}

By including a key in the div element, React will recognize it as a distinct component and only update its inner text during re-renders. This prevents unnecessary unmounting and remounting of components.

Answer 2

To improve efficiency, insert a unique key into your code:

function Card({ cardText }) {
  return <div key={cardText} className="roll-out">{cardText}<div/>
}

By including a key in the div element, React will recognize it as a distinct component and only update its inner text during re-renders. This prevents unnecessary unmounting and remounting of components.

Answer 3

Answer №2

If you want to force React to treat each rerendered element as new, try using a random key field on your card element. This will trick React's diffing algorithm into seeing the elements with different keys as completely new, causing it to remove the old element from the DOM and add a fresh one in its place.

Check out this demo based on @aXuser264's code:

class Card extends React.Component{
   onClick = ()=>this.forceUpdate();
   render(){
       return <div key={Math.random()} className="roll-out" onClick={this.onClick}> {
    this.props.cardText
     } </div>
  }
}

ReactDOM.render( (<Card cardText="Hey There" />) , document.getElementById('root'))

@keyframes rollout {
  0% {
    transform: translateY(-100px);
  }
  100% {
    transform: translateY(0);
  }
}

.roll-out {
  animation: .4s rollout;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>


<div id="root"></div>

Answer 4

If you want to force React to treat each rerendered element as new, try using a random key field on your card element. This will trick React's diffing algorithm into seeing the elements with different keys as completely new, causing it to remove the old element from the DOM and add a fresh one in its place.

Check out this demo based on @aXuser264's code:

class Card extends React.Component{
   onClick = ()=>this.forceUpdate();
   render(){
       return <div key={Math.random()} className="roll-out" onClick={this.onClick}> {
    this.props.cardText
     } </div>
  }
}

ReactDOM.render( (<Card cardText="Hey There" />) , document.getElementById('root'))

@keyframes rollout {
  0% {
    transform: translateY(-100px);
  }
  100% {
    transform: translateY(0);
  }
}

.roll-out {
  animation: .4s rollout;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>


<div id="root"></div>

Answer 5

Answer №3

If you want to trigger a re-render of an element, simply modify its key prop which will force React to render it as a new element.

For more information, please check out this answer:

function Card({
  cardText
}) {
  return <div className = "roll-out" > {
    cardText
  } </div>
}

ReactDOM.render( (<Card cardText="Hey There" />) , document.getElementById('root'))

@keyframes rollout {
  0% {
    transform: translateY(-100px);
  }
  100% {
    transform: translateY(0);
  }
}

.roll-out {
  animation: .4s rollout;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>


<div id="root"></div>

Answer 6

If you want to trigger a re-render of an element, simply modify its key prop which will force React to render it as a new element.

For more information, please check out this answer:

function Card({
  cardText
}) {
  return <div className = "roll-out" > {
    cardText
  } </div>
}

ReactDOM.render( (<Card cardText="Hey There" />) , document.getElementById('root'))

@keyframes rollout {
  0% {
    transform: translateY(-100px);
  }
  100% {
    transform: translateY(0);
  }
}

.roll-out {
  animation: .4s rollout;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>


<div id="root"></div>

Tips for automatically activating a CSS animation each time a react component re-renders

Answer №1

Answer №2

Answer №3

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