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[英]Can we pass props from Parent to Child component in React, and set the props as state of child component?
[英]React: Pass 2 props back to the parent component in the same function from the child
我想设置 state 并同时关闭模式,两者都是通过将道具传递回父组件来完成的。 我遇到的问题是一次似乎只有 1 人想工作。 我可以让两者都自己工作,但是一旦它们都在那里,它就不起作用了。 我该如何解决这个问题?
CHILD COMPONENT
useSelectedImage = () => {
this.props.saveChosenImage(this.state.imageChosen)
this.props.closeModal();
};
<button onClick={this.useSelectedImage}>INSERT IMAGE</button>
PARENT COMPONENT
state = {
imageModalOpen: false,
}
// open the image modal
openImageModal = () => {
this.setState({ ...this.state, imageModalOpen: true })
};
// close the image modal
handleImageClose = () => {
this.setState({ ...this.state, imageModalOpen: false })
};
<Modal
open={this.state.imageModalOpen}
onClose={this.handleImageClose}
>
<DialogContent className={classes.DialogContent}>
<SelectImageModal saveChosenImage={this.saveChosenImage} closeModal={this.handleImageClose}/>
</DialogContent>
<modal>
saveChosenImage = (image) => {
this.setState({ ...this.state, imageChosen: image })
};
试试这样。
CHILD COMPONENT
useSelectedImage = () => {
this.props.saveChosenImage(this.state.imageChosen);
- this.props.closeModal(); //remove this
};
...
PARENT COMPONENT
...
saveChosenImage = (image) => {
this.setState({ ...this.state, imageChosen: image, imageModalOpen: false }); // modified here
};
您可以在另一个内部调用一个 function。 这样,您就可以保持方法的纯度。 您仍然可以在关闭按钮上重用handleImageClose
而无需选择图像。
请参阅代码框https://codesandbox.io/s/sweet-torvalds-3dyv5上的示例
import React, { Component } from "react";
import ReactDOM from "react-dom";
const Child = props => {
const useSelectedImage = () => {
console.log("clicked");
// DO THIS
return props.closeModal(props.saveChosenImage(props.theImage));
};
return (
<div>
<button onClick={useSelectedImage}>Select Image</button>
<button onClick={props.closeModal}>Cancel</button>
</div>
);
};
class Parent extends Component {
openImageModal = () => console.log("OPEN FIRED");
handleImageClose = () => {
console.log("CLOSED FIRED");
this.setState({ closed: true });
};
saveChosenImage = image => {
console.log(`SAVED!! ${image}`);
this.setState({ image });
};
render() {
console.log(this.state);
return (
<Child
saveChosenImage={this.saveChosenImage}
closeModal={this.handleImageClose}
theImage="cow.jpg"
/>
);
}
}
function App() {
return (
<div className="App">
<Parent />
</div>
);
}
const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
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