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React Performance: requestAnimationFrame Example
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// How to ensure that our animation loop ends on component unount | |
componentDidMount() { | |
this.startLoop(); | |
} | |
componentWillUnmount() { | |
this.stopLoop(); | |
} | |
startLoop() { | |
if( !this._frameId ) { | |
this._frameId = window.requestAnimationFrame( this.loop ); | |
} | |
} | |
loop() { | |
// perform loop work here | |
this.theoreticalComponentAnimationFunction() | |
// Set up next iteration of the loop | |
this.frameId = window.requestAnimationFrame( this.loop ) | |
} | |
stopLoop() { | |
window.cancelAnimationFrame( this._frameId ); | |
// Note: no need to worry if the loop has already been cancelled | |
// cancelAnimationFrame() won't throw an error | |
} |
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componentDidMount() {
this.startLoop();
}
componentWillUnmount() {
this.stopLoop();
}
startLoop() {
if (!this._frameId) {
this._frameId = window.requestAnimationFrame(this.loop.bind(this));
}
}
loop() {
// perform loop work here
// Set up next iteration of the loop
this._frameId = window.requestAnimationFrame(this.loop.bind(this));
}
stopLoop() {
window.cancelAnimationFrame(this._frameId);
// Note: no need to worry if the loop has already been cancelled
// cancelAnimationFrame() won't throw an error
}