javascript - 如何确定哪个组件在React中触发事件处理程序？

我想将事件处理程序绑定到React中的多个组件。现在，我为每个组件设置className并使用event.currentTarget.className确定哪个组件触发了处理程序。

handleClick: function (e) {
    var className = e.currentTarget.className;
    if (className === "longComment") {
        this.setState({showLongComment: !this.state.showLongComment});
    } else {
        this.setState({showShortComment: !this.state.showShortComment});
    }
},

render: function () {
    var topic = this.props.topic;
    var shortComment = this.state.showShortComment ? '[-]' : '[+]';
    var longComment = this.state.showLongComment ? '[--]' : '[++]';

    return (
        <li className="topic">
            <div className="title">
                <a target="_blank" href={api}>
                    {this.props.children.toString()}
                </a>&nbsp;
                <span className="longComment" onClick={this.handleClick}>
                    {longcomment}
                </span>
                <span className="shortComment" onClick={this.handleClick}>
                    {shortcomment}
                </span>
            </div>
            {this.state.showLongComment ? <CommentList url={url} /> : null}
            {this.state.showShortComment ? <CommentList url={url} /> : null}
        </li>
    );
}

React中有什么本机方法可以知道哪个组件触发了事件处理程序？

最佳答案

您可以通过将不同的参数绑定到handleClick函数来实现所需的功能：

handleClick: function (propertyName) {

    var newState = {};
    newState[propertyName] = !this.state[propertyName];
    this.setState(newState);

},

render: function () {
    var topic = this.props.topic;
    var shortComment = this.state.showShortComment ? '[-]' : '[+]';
    var longComment = this.state.showLongComment ? '[--]' : '[++]';

    return (
        <li className="topic">
            <div className="title">
                <a target="_blank" href={api}>
                    {this.props.children.toString()}
                </a>&nbsp;
                <span className="longComment" onClick={this.handleClick.bind(this,"showLongComment")}>
                    {longcomment}
                </span>
                <span className="shortComment" onClick={this.handleClick.bind(this,"showShortComment")}>
                    {shortcomment}
                </span>
            </div>
            {this.state.showLongComment ? <CommentList url={url} /> : null}
            {this.state.showShortComment ? <CommentList url={url} /> : null}
        </li>
    );
}

关于javascript - 如何确定哪个组件在React中触发事件处理程序？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/28252703/