在React Select中高效地呈现大型数据列表

Question

在可搜索的react select下拉列表中呈现大型数据列表的最佳方式是什么？我研究过窗口，在窗口中，只为在视口中可见的项目创建DOM节点。这可以通过使用react-window包和react-select来完成。然而，我想知道是否有比这更好的方法。

这是使用react-window和react-select的窗口实现

import React, { Component } from "react";
import ReactDOM from "react-dom";
import Select from "react-select";
import { FixedSizeList as List } from "react-window";

import "./styles.css";

const options = [];
for (let i = 0; i < 10000; i = i + 1) {
  options.push({ value: i, label: `Option ${i}` });
}

const height = 35;

class MenuList extends Component {
  render() {
    const { options, children, maxHeight, getValue } = this.props;
    const [value] = getValue();
    const initialOffset = options.indexOf(value) * height;

    return (
      <List
        height={maxHeight}
        itemCount={children.length}
        itemSize={height}
        initialScrollOffset={initialOffset}
      >
        {({ index, style }) => <div style={style}>{children[index]}</div>}
      </List>
    );
  }
}

const App = () => <Select components={{ MenuList }} options={options} />;

ReactDOM.render(<App />, document.getElementById("root"));

Answer 1

我将您提到的解决方案(react-window)与filterOption解决方案以及较少讨论的react-async组件组合在一起。这对我来说效果很好。

react-window将执行某种“惰性加载”，而异步react会在显示搜索查询之前显示一个加载标志。这些结合在一起让它感觉更自然(我有7000+选项)。

这是我第一次回复帖子，如果有人有问题，请告诉我，我会尽我所能回答

​

import React, { Component } from "react";
import AsyncSelect from "react-select/async";
import { FixedSizeList as List } from "react-window";
import { createFilter } from "react-select";

import "./styles.css";

const TestSelect = (vendorOptions) => {


const options = [];
for (let i = 0; i < vendorOptions["vendorOptions"].length; i = i + 1) {
  options.push({ value: vendorOptions["vendorOptions"][i], label: `${vendorOptions["vendorOptions"][i]}` });
}

const loadOptions = (inputValue, callback) => {
    setTimeout(() => {
      callback(options);
    }, 1000);
  };


const height = 35;

class MenuList extends Component {
  render() {
    const { options, children, maxHeight, getValue } = this.props;
    const [value] = getValue();
    const initialOffset = options.indexOf(value) * height;

    return (
      <List
        height={maxHeight}
        itemCount={children.length}
        itemSize={height}
        initialScrollOffset={initialOffset}
      >
        {({ index, style }) => <div style={style}>{children[index]}</div>}
      </List>
    );
  }
}

const TestSelectComponent = () => {
    
    return(
        <div className ="testDropdown">
          <AsyncSelect components={{ MenuList }} cacheOptions defaultOptions loadOptions={loadOptions} filterOption={createFilter({ ignoreAccents: false })}/>
        </div>
    )
}
    return (
    <TestSelectComponent />
    )
}
export default TestSelect

​

Answer 2

如果你看一下，你会发现默认值是ignoreAccents: true。此缺省值使react-select两次调用名为stripDiacritics的代价高昂的函数。这会导致性能问题。

在react-select中包含ignoreAccents: false。

示例：filterOption={createFilter({ ignoreAccents: false })}