如何从React中的子元素/ DOM /组件调用父方法？

Question

我试图从closeBtn DOM调用DrawerItem方法。由于它是ToggleDrawer的子组件，DrawerItem如何才能访问closeBtn方法？

class Header extends React.Component {
  //no method here

  render() {
    return (
      ...

      <ToggleDrawer
        icon_class="notify-toggle"
        alignment="right"
        icon_link={Url.urlForStatic('images.g')} ...
      >
        <DrawerItem text="Alert 1" />
        <DrawerItem text="Alert 2" />
        <DrawerItem text="Alert 3" />
      </ToggleDrawer>

这是ToggleDrawer类。

class ToggleDrawer extends React.PureComponent {

    ...
    closeDrawer() { //I want to call this method from DrawerItem.
                    //so that once user clicks the item, it closes the drawer.
        this.ref.hide();
    }
    ... 

这是DrawerItem

class DrawerItem extends React.PureComponent {
  render() {
    console.log(this.props); // <- How can I get this.props.closeBtn method here?
    return (
      <div className="drawer-item">
        <BinaryLink to={this.props.link_to}>
          <span ...>{this.props.text}</span>
        </BinaryLink>
      </div>
    );
  }
}

Answer 1

简单的方法就是你应该为DrawerItem创建closeDrawer prop并通过 DrawerItem

的道具推送 closeDrawer（）

BAR_*

Answer 2

我认为如果你不使用Redux，你应该处理ToggleDrawer之外的state，方法。为什么不制作像ToggleDrawerContainer这样的组件，并将方法作为道具传递给DrawerItem。

class ToogleDrawerContainer extends React.Component {

    closeDrawer(){};
    <ToggleDrawer
        icon_class='notify-toggle'
        alignment='right'
        icon_link={Url.urlForStatic('images.g')}...
    >
        <DrawerItem closeDrawer={this.closeDrawer} text='Alert 1'/>
    </ToggleDrawer>
}

Answer 3

声明toggleDrawer：ToggleDrawer

<ToggleDrawer
  ref={tg => {
    if (tg) this.toggleDrawer = tg;
  }}
  icon_class="notify-toggle"
  alignment="right"
  icon_link={Url.urlForStatic('images.g')} ...
>
  <DrawerItem
    closeDrawer={this.toggleDrawer ? this.toggleDrawer.closeDrawer : () => {}}
    text="Alert 1"
  />
  <DrawerItem
    closeDrawer={this.toggleDrawer ? this.toggleDrawer.closeDrawer : () => {}}
    text="Alert 1"
  />
  <DrawerItem
    closeDrawer={this.toggleDrawer ? this.toggleDrawer.closeDrawer : () => {}}
    text="Alert 1"
  />
</ToggleDrawer>;