获取 React-Select 中突出显示的选项的值

Question

我将 react-select v2 与异步选择组件一起使用。

        <AsyncSelect
            cacheOptions
            components={{ Option }}
            loadOptions={this.getSearchItems}
            onInputChange={this.handleInputChange}
            placeholder="Search..."
            onKeyDown={this._handleKeyPress}
        />

如何访问因使用键盘上的向下键或鼠标悬停而突出显示的选项的值？

我想根据 highlighted 选项触发重定向或 setState。 onKeyDown 仅以event.target.value 的形式发送输入值。

这是 Nordstrom 网站上的一个示例：

Answer 1

我认为仅使用 react-select api 是不可能的，但您可以创建自己的 HOC，将这个功能添加到 AsyncSelect。

class MyAsyncSelect extends React.Component {

  /* Select component reference can be used to get currently focused option */
  getFocusedOption() {
    return this.ref.select.select.state.focusedOption;
  }

  /* we'll store lastFocusedOption as instance variable (no reason to use state) */
  componentDidMount() {
    this.lastFocusedOption = this.getFocusedOption();
  }

  /* Select component reference can be used to check if menu is opened */
  isMenuOpen() {
    return this.ref.select.state.menuIsOpen;
  }

  /* This function will be called after each user interaction (click, keydown, mousemove).
     If menu is opened and focused value has been changed we will call onFocusedOptionChanged 
     function passed to this component using props. We do it asynchronously because onKeyDown
     event is fired before the focused option has been changed.
  */
  onUserInteracted = () => {
    Promise.resolve().then(() => {
      const focusedOption = this.getFocusedOption();
      if (this.isMenuOpen() && this.lastFocusedOption !== focusedOption) {
        this.lastFocusedOption = focusedOption;
        this.props.onFocusedOptionChanged(focusedOption);
      }
    });
  }

  /* in render we're setting onUserInteracted method as callback to different user interactions */
  render () {
    return (
      <div onMouseMove={this.onUserInteracted} onClick={this.onUserInteracted}> 
        <AsyncSelect 
          {...this.props} 
          ref={ref => this.ref = ref}
          onKeyDown={this.onUserInteracted}
        />
      </div>
    );
  }
}

然后您可以像 AsyncSelect 一样使用此自定义组件，但能够对焦点选项更改做出反应：

class App extends React.Component {

  onFocusedOptionChanged = focusedValue => console.log(focusedValue) 

  render() {
    return (
      <div>
        <MyAsyncSelect
          cacheOptions
          loadOptions={loadOptions}
          defaultOptions
          onInputChange={this.handleInputChange}
          onFocusedOptionChanged={this.onFocusedOptionChanged}
        />
      </div>
    );
  }
}

工作演示：https://stackblitz.com/edit/react-z7izuy

编辑： 带有附加属性onOptionSelected 的版本，当用户选择选项时将调用该属性。 https://stackblitz.com/edit/react-wpljbl

Answer 2

我通过使用 onChange 道具解决了这个问题。

1. UI/选择组件

     class CustomSelect extends React.PureComponent<IProps> {
       handleChange = (selectedOption: any) => {
       if (this.props.onSelect) {
           this.props.onSelect(selectedOption);
       }
     };
   
     render() {
       const { data } = this.props;
       return (
         <Select
           onChange={this.handleChange}
           options={data}
         />
       );
     }
   

   }

   1. 我将 CustomSelect 与 react-router 4 一起使用的父级（我可以访问 withRouter）。

      class SelectParent extends React.Component<IProps> {
        onSelect = (option: any) => {
        const id = option.value;
        const { history } = this.props;
        history.push(`/category/${id}`);
      };
      
      render() {
        const { data } = this.props;
        return (
          <Select
          data={data}
          onSelect={this.onSelect}
        />);
        }
      }
      
      export default withRouter<any>(SelectParent);
      

Answer 3

这对我有用。

 handleOnChange = (value, { action }) => {
    if (action === 'select-option') {
      // do something
    }
  };


 render() {
   return (
     <Select onChange={this.handleOnChange} ... />
   )
 }