我正在尝试使用setInterval卸载组件。
这是基于答案here:
组件:
class ImageSlider extends React.Component {
constructor(props) {
super(props);
this.state = { activeMediaIndex: 0 };
}
componentDidMount() {
setInterval(this.changeActiveMedia.bind(this), 5000);
}
changeActiveMedia() {
const mediaListLength = this.props.mediaList.length;
let nextMediaIndex = this.state.activeMediaIndex + 1;
if(nextMediaIndex >= mediaListLength) {
nextMediaIndex = 0;
}
this.setState({ activeMediaIndex:nextMediaIndex });
}
renderSlideshow(){
const singlePhoto = this.props.mediaList[this.state.activeMediaIndex];
return(
<div>
<img src={singlePhoto.url} />
</div>
);
}
render(){
return(
<div>
{this.renderSlideshow()}
</div>
)
}
}
现在,当我转到另一页时,我收到此错误:
Can only update a mounted or mounting component. This usually means you called setState() on an unmounted component
所以我添加了这样的东西:
componentWillUnmount(){
clearInterval(this.interval);
}
我也试过了:
componentWillUnmount(){
clearInterval(this.changeActiveMedia);
}
但我仍然每5秒钟收到上述错误。有没有正确的方法来清除间隔?
答案 0 :(得分:16)
setInterval
会返回您可以在clearInterval
中使用的时间间隔ID。
这样的事情应该有效:
this.myInterval = setInterval(this.changeActiveMedia.bind(this), 5000)
然后在componentWillUnmount:
clearInterval(this.myInterval);