reactjs – React无法专注于div

当我点击像 here这样的按钮时,我试着把注意力集中在一个div上.我将我的问题减少到下面的代码,虽然在div对象上调用焦点,但是永远不会调用onFocus.此外,autoFocus无法解决我的问题,因为我希望能够在组件安装后多次更改焦点.

class App extends React.Component {
    constructor() {
        super();
        this.my_refs = {};
        this.focusByID.bind(this);
    }

    focusByID(id){
        let myRef = this.my_refs[id];
        if(myRef){
            console.log('focusing on ',id,myRef);
            myRef.focus();
        }
    }
    render() {
        return (
            <div>
                <div
                    id="bigRedDiv"
                    style={{height : 200,width : 200,backgroundColor : 'red'}}
                    ref={(input) => this.my_refs['bigRedDiv'] = input }
                    onFocus={() => console.log('FOCUS IS ON BIG RED DIV')}
                    onClick={() => this.focusByID('bigRedDiv')}
                >
                </div>
            </div>
        );
    }
}

这是包含此代码的fiddle.

只是：

...
<div 
    tabIndex="0" //use this attribute
    id="bigRedDiv" 
    style={{height : 200,backgroundColor : 'red'}} 
    ref={(input)=> this.my_refs['bigRedDiv'] = input } 
    onFocus={() => console.log('FOCUS IS ON BIG RED DIV')} 
    onClick={() => this.focusByID('bigRedDiv')} >
</div>
...