我有两个组件:父组件,我想通过它更改子组件的状态:
class ParentComponent extends Component {
toggleChildMenu() {
?????????
}
render() {
return (
<div>
<button onClick={toggleChildMenu.bind(this)}>
Toggle Menu from Parent
</button>
<ChildComponent />
</div>
);
}
}
和子组件
class ChildComponent extends Component {
constructor(props) {
super(props);
this.state = {
open: false;
}
}
toggleMenu() {
this.setState({
open: !this.state.open
});
}
render() {
return (
<Drawer open={this.state.open}/>
);
}
}
当点击父组件中的按钮时,我需要从父组件中更改子组件的打开状态,或者从父组件调用子组件的toggleMenu()?
发布于 2016-08-19 22:47:33
状态应该在父组件中进行管理。您可以通过添加特性将open
值传递给子组件。
class ParentComponent extends Component {
constructor(props) {
super(props);
this.state = {
open: false
};
this.toggleChildMenu = this.toggleChildMenu.bind(this);
}
toggleChildMenu() {
this.setState(state => ({
open: !state.open
}));
}
render() {
return (
<div>
<button onClick={this.toggleChildMenu}>
Toggle Menu from Parent
</button>
<ChildComponent open={this.state.open} />
</div>
);
}
}
class ChildComponent extends Component {
render() {
return (
<Drawer open={this.props.open}/>
);
}
}
发布于 2018-07-13 05:12:47
父组件可以管理子状态,将属性传递给子组件,子组件使用componentWillReceiveProps将该属性转换为状态。
class ParentComponent extends Component {
state = { drawerOpen: false }
toggleChildMenu = () => {
this.setState({ drawerOpen: !this.state.drawerOpen })
}
render() {
return (
<div>
<button onClick={this.toggleChildMenu}>Toggle Menu from Parent</button>
<ChildComponent drawerOpen={this.state.drawerOpen} />
</div>
)
}
}
class ChildComponent extends Component {
constructor(props) {
super(props)
this.state = {
open: false
}
}
componentWillReceiveProps(props) {
this.setState({ open: props.drawerOpen })
}
toggleMenu() {
this.setState({
open: !this.state.open
})
}
render() {
return <Drawer open={this.state.open} />
}
}
发布于 2018-02-12 16:29:36
上面的答案对我来说是部分正确的,但在我的场景中,我希望将值设置为一个状态,因为我已经使用该值来显示/切换模式。所以我用了下面这样的方法。希望它能帮助到一些人。
class Child extends React.Component {
state = {
visible:false
};
handleCancel = (e) => {
e.preventDefault();
this.setState({ visible: false });
};
componentDidMount() {
this.props.onRef(this)
}
componentWillUnmount() {
this.props.onRef(undefined)
}
method() {
this.setState({ visible: true });
}
render() {
return (<Modal title="My title?" visible={this.state.visible} onCancel={this.handleCancel}>
{"Content"}
</Modal>)
}
}
class Parent extends React.Component {
onClick = () => {
this.child.method() // do stuff
}
render() {
return (
<div>
<Child onRef={ref => (this.child = ref)} />
<button onClick={this.onClick}>Child.method()</button>
</div>
);
}
}
参考- https://github.com/kriasoft/react-starter-kit/issues/909#issuecomment-252969542
https://stackoverflow.com/questions/39041710
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