React-Select：在下拉列表中显示搜索栏

Question

我喜欢react-select 的实现，并期待在我的项目中使用它。

有没有办法在下拉列表中添加一个搜索栏（比如react-widgets - DropdownList）？在与我们的设计人员和用户进行的测试中，我们发现用户并不总是意识到下拉菜单是可搜索的，并且由于这一功能，似乎绝大多数人更喜欢 DropwdownList 小部件。

也就是说，我喜欢 react-select 的可定制性和功能集，并希望能够使用它。

-丹尼尔

Answer 1

有一个example，它看起来与您在react-select 文档的高级部分所追求的非常相似。它需要使用自定义组件，但这是可能的。

Working Example

这是他们在文档中提供的代码：

/** @jsx jsx */
import { Component } from 'react';
import { jsx } from '@emotion/core';
import Button from '@atlaskit/button';

import Select from 'react-select';
import { defaultTheme } from 'react-select';
import { stateOptions } from '../data';

const { colors } = defaultTheme;

const selectStyles = {
  control: provided => ({ ...provided, minWidth: 240, margin: 8 }),
  menu: () => ({ boxShadow: 'inset 0 1px 0 rgba(0, 0, 0, 0.1)' }),
};

type State = { isOpen: boolean, value: Object };

export default class PopoutExample extends Component<*, State> {
  state = { isOpen: false, value: undefined };
  toggleOpen = () => {
    this.setState(state => ({ isOpen: !state.isOpen }));
  };
  onSelectChange = value => {
    this.toggleOpen();
    this.setState({ value });
  };
  render() {
    const { isOpen, value } = this.state;
    return (
      <Dropdown
        isOpen={isOpen}
        onClose={this.toggleOpen}
        target={
          <Button
            iconAfter={<ChevronDown />}
            onClick={this.toggleOpen}
            isSelected={isOpen}
          >
            {value ? `State: ${value.label}` : 'Select a State'}
          </Button>
        }
      >
        <Select
          autoFocus
          backspaceRemovesValue={false}
          components={{ DropdownIndicator, IndicatorSeparator: null }}
          controlShouldRenderValue={false}
          hideSelectedOptions={false}
          isClearable={false}
          menuIsOpen
          onChange={this.onSelectChange}
          options={stateOptions}
          placeholder="Search..."
          styles={selectStyles}
          tabSelectsValue={false}
          value={value}
        />
      </Dropdown>
    );
  }
}

// styled components

const Menu = props => {
  const shadow = 'hsla(218, 50%, 10%, 0.1)';
  return (
    <div
      css={{
        backgroundColor: 'white',
        borderRadius: 4,
        boxShadow: `0 0 0 1px ${shadow}, 0 4px 11px ${shadow}`,
        marginTop: 8,
        position: 'absolute',
        zIndex: 2,
      }}
      {...props}
    />
  );
};
const Blanket = props => (
  <div
    css={{
      bottom: 0,
      left: 0,
      top: 0,
      right: 0,
      position: 'fixed',
      zIndex: 1,
    }}
    {...props}
  />
);
const Dropdown = ({ children, isOpen, target, onClose }) => (
  <div css={{ position: 'relative' }}>
    {target}
    {isOpen ? <Menu>{children}</Menu> : null}
    {isOpen ? <Blanket onClick={onClose} /> : null}
  </div>
);
const Svg = p => (
  <svg
    width="24"
    height="24"
    viewBox="0 0 24 24"
    focusable="false"
    role="presentation"
    {...p}
  />
);
const DropdownIndicator = () => (
  <div css={{ color: colors.neutral20, height: 24, width: 32 }}>
    <Svg>
      <path
        d="M16.436 15.085l3.94 4.01a1 1 0 0 1-1.425 1.402l-3.938-4.006a7.5 7.5 0 1 1 1.423-1.406zM10.5 16a5.5 5.5 0 1 0 0-11 5.5 5.5 0 0 0 0 11z"
        fill="currentColor"
        fillRule="evenodd"
      />
    </Svg>
  </div>
);
const ChevronDown = () => (
  <Svg style={{ marginRight: -6 }}>
    <path
      d="M8.292 10.293a1.009 1.009 0 0 0 0 1.419l2.939 2.965c.218.215.5.322.779.322s.556-.107.769-.322l2.93-2.955a1.01 1.01 0 0 0 0-1.419.987.987 0 0 0-1.406 0l-2.298 2.317-2.307-2.327a.99.99 0 0 0-1.406 0z"
      fill="currentColor"
      fillRule="evenodd"
    />
  </Svg>

Answer 2

已在 react-select V2 中解决。参考https://react-select.com/home