通过使用ref
传递onClick =的动态属性可以使我回想起来:TypeError: _this.listReference is null
listReference在我将在下面显示的组件之一中定义。
在组件#1中
class Component1 extends Component {
constructor(props){
super(props)
this.listReference= null;
}
//Returns
<div>
<SomeComponent list={(ref) => this.listReference= ref} />
<Component2 onMarkerClick = {(index) => {
this.listReference.scrollTop = 48 * index
}}/>
在组件#2中
render() {
const {classes, driversStore, onMarkerCLick} = this.props
...
{driversStore.sortedSelectedOrders.map((order , index) => {
return (
<Component3
onClick={ () => onMarkerClick(index)} />
在组件#3中
render() {
const { onClick } = this.props;
return (
<div
onClick={onClick}>
我希望在单击时触发滚动功能(如组件1中所述)。
提前致谢!
最佳答案
检查此示例。希望它能对您有所帮助!
const Component2 = (props) =>(
<button onClick={props.onClick}>click me</button>
);
const SomeCompo = (props) =>(
<div>SomeComponent</div>
);
class Component1 extends React.Component{
listReference = React.createRef();
render(){
return(
<div>
<SomeCompo list={this.listReference}>reference</SomeCompo>
<Component2 onClick={this.handleClick} />
</div>
);
}
handleClick = () => {
if(this.listReference){
this.listReference={scrollTop:100};
}
console.log(this.listReference)
}
}
ReactDOM.render(<Component1/>,document.getElementById("root"));
<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>
您应该在构造函数中执行以下操作,
this.listReference = React.createRef()