React-在组件函数内部调用props函数

Question

Trying to do something like this:

// Component one

toggleDropdown() {
  setState({open: !open}
}

render () {
  return (
   ChildComponent toggle={this.toggleDropdown} />
  )
}

Then in my child component I'd like to call that toggleDropdown function in another function like this:

// This gets triggered on click.
removeItem() {
  // remove scripts then:
  this.props.toggleDropdown()
}

I thought you'd be able to do something like this but it appears that you can only call prop functions on the element?

Answer 1

The prop that you are passing down to the child component is named toggle and not toggleDropdown and hence you need to call it like that in the removeItem component

// This gets triggered on click.
removeItem() {
  this.props.toggle()
}

Other things that you might need to do is to bind your removeItem function using bind or arrow functions

constructor(props) {
    super(props);
    this.removeItem = this.removeItem.bind(this);
}

or

// This gets triggered on click.
removeItem = () => {
  this.props.toggle()
}

Answer 2

您只需要调用toggle而不是toggleDropdown 。

this.props.toggle();

Answer 3

The child component's prop is named toggle , while toggleDropdown belongs to the parent component.

This should work in the child component:

removeItem() {
    this.props.toggle();
}