useImperativeHandle ts
时间: 2023-11-11 13:55:52 浏览: 93
ImperativeHandle is a React Hook that allows you to expose certain functions or actions from a child component to its parent component. It is primarily used for communication between parent and child components when the child component needs to be controlled or manipulated from the parent component.
Here's an example of how to use `useImperativeHandle` in TypeScript:
In the child component:
```typescript
import React, { forwardRef, useImperativeHandle, Ref } from 'react';
type ChildProps = {
// define any props needed by the child component
};
type ChildRef = {
// define any functions or actions that will be exposed to the parent component
doSomething: () => void;
};
const ChildComponent = forwardRef<ChildRef, ChildProps>((props, ref) => {
// define any state or logic for the child component
useImperativeHandle(ref, () => ({
// expose functions or actions to the parent component
doSomething: () => {
// implement the functionality here
},
}));
// render the child component
return <div>Child Component</div>;
});
export default ChildComponent;
```
In the parent component:
```typescript
import React, { useRef } from 'react';
import ChildComponent from './ChildComponent';
const ParentComponent = () => {
const childRef = useRef<ChildRef>(null);
const handleClick = () => {
if (childRef.current) {
childRef.current.doSomething();
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