javascript - 如何将回调函数传递给父级

Question

假设我们有一个Container组件如下。

class Container extends React.Component {
    handleClose = () => {
        // need to ask 'Content' is it okay with closing
        const isContentAgree = /* */;
        if (isContentAgree) this.props.onClose();
    };

    render () {
        const {content: Content} = this.props;
        return (
            <button onClick={this.handleClick}>Close</button>
            <Content {/* some container-specific props */} />
        );
    }
}

用法:

<Container content={SomeComponent}/>

在这种情况下，如何将回调函数从 SomeComponent 传递到 Container？当单击 Container 中的按钮并返回 bool 值时将调用此回调。

Answer 1

您需要将 isContentAgree 保持在 state 并且您可以传递函数来将 isContentAgree 切换到子组件。

class Container extends React.Component {
        constructor(props) {
            super(props);
            this.state = {
              isContentAgree: false
            }
        }

        toggleContentAgree = (e) => {
            this.setState({ isContentAgree: e.target.value })
        }

        handleClose = () => {
            // need to ask 'Content' is it okay with closing
            const isContentAgree = this.state.isContentAgree;
            if (isContentAgree) this.props.onClose();
        };

        render () {
            const {content: Content} = this.props;
            return (
                <button onClick={this.handleClose}>Close</button>
                <Content toggleContentAgree={this.toggleContentAgree} />
            );
        }
    }