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React Autocomplete（自动完成输入）示例教程

jiezi

React Autocomplete 示例教程是今天的主题。在现代 Web 开发中，使用 React 改善用户体验是很容易。自动完成的概念很简单。它是基于用户输入的建议列表。然后，用户可以按 Enter 键以完成短语。它节省了用户的时间，这使用户非常满意。自动填充可以通过多种方式实现，如何过滤并呈现给用户，在本文中，我们将使用传递给我们组件的固定推荐列表。在用户输入时，我们将过滤结果，并仅在建议中的任何位置显示包含用户输入的字段。
如果您想了解有关 React.js 的更多信息，请查看此 React 16 – 完整指南（包括 React Router 4 和 Redux）指南。它有一个关于 React 和 Redux 的简短介绍。React 16 – 完整指南（包括 React Router 4 和 Redux）
React Autocomplete 示例教程我们在本教程中使用名为 [react-autocomplete] 的库 (https://github.com/reactjs/re…。但首先，让我们使用以下命令安装 React.js 命令。
1: 安装 React.js.
键入以下命令。
npx create-react-app my-app
cd my-app
npm start
现在，使用以下命令安装 react-autocomplete 库。
npm install –save react-autocomplete
2: 创建静态数据。
在 src 文件夹中，创建一个名为 data.js 的文件，并添加以下返回静态数据的函数。
// data.js

export function getStocks() {
return [
{abbr: ‘ADANIPORTS’, name: ‘Adani Ports & Special Economic Zone Ltd.’},
{abbr: ‘ASIANPAINT’, name: ‘Asian Paints Ltd.’},
{abbr: ‘AXISBANK’, name: ‘Axis Bank Ltd.’},
{abbr: ‘BAJAJ-AUTO’, name: ‘Bajaj Auto Ltd.’},
{abbr: ‘BAJFINANCE’, name: ‘Bajaj Finance’},
{abbr: ‘BAJAJFINSV’, name: ‘Bajaj Finserv Ltd.’},
{abbr: ‘BPCL’, name: ‘Bharat Petroleum Corporation Ltd.’},
{abbr: ‘BHARTIARTL’, name: ‘Bharti Airtel Ltd.’},
{abbr: ‘INFRATEL’, name: ‘Bharti Infratel’},
{abbr: ‘CIPLA’, name: ‘Cipla Ltd.’},
{abbr: ‘COALINDIA’, name: ‘Coal India Ltd’},
{abbr: ‘DRREDDY’, name: ‘Dr. Reddys Laboratories Ltd.’},
{abbr: ‘EICHERMOT’, name: ‘Eicher Motors Ltd.’},
{abbr: ‘GAIL’, name: ‘GAIL (India) Ltd.’ },
{abbr: ‘GRASIM’, name: ‘Grasim Industries Ltd.’},
{abbr: ‘HCLTECH’, name: ‘HCL Technologies Ltd.’},
{abbr: ‘HDFCBANK’, name: ‘HDFC Bank Ltd.’},
{abbr: ‘HEROMOTOCO’, name: ‘Hero MotoCorp Ltd.’},
{abbr: ‘HINDALCO’, name: ‘Hindalco Industries Ltd.’},
{abbr: ‘HINDPETRO’, name: ‘Hindustan Petroleum Corporation Ltd.’},
{abbr: ‘HINDUNILVR’, name: ‘Hindustan Unilever Ltd.’},
{abbr: ‘HDFC’, name: ‘Housing Development Finance Corporation Ltd.’},
{abbr: ‘ITC’, name: ‘I T C Ltd.’},
{abbr: ‘ICICIBANK’, name: ‘ICICI Bank Ltd.’},
{abbr: ‘IBULHSGFIN’, name: ‘Indiabulls Housing Finance’},
{abbr: ‘IOC’, name: ‘Indian Oil Corporation Ltd.’},
{abbr: ‘INDUSINDBK’, name: ‘IndusInd Bank Ltd.’},
{abbr: ‘INFY ‘, name: ‘Infosys Ltd.’},
{abbr: ‘KOTAKBANK’, name: ‘Kotak Mahindra Bank Ltd.’},
{abbr: ‘LT’, name: ‘Larsen & Toubro Ltd.’},
{abbr: ‘LUPIN’, name: ‘Lupin Ltd.’},
{abbr: ‘M&M’, name: ‘Mahindra & Mahindra Ltd.’},
{abbr: ‘MARUTI’, name: ‘Maruti Suzuki India Ltd.’},
{abbr: ‘NTPC’, name: ‘NTPC Ltd.’},
{abbr: ‘ONGC’, name: ‘Oil & Natural Gas Corporation Ltd.’},
{abbr: ‘POWERGRID’, name: ‘Power Grid Corporation of India Ltd.’},
{abbr: ‘RELIANCE’, name: ‘Reliance Industries Ltd.’},
{abbr: ‘SBIN’, name: ‘State Bank of India’},
{abbr: ‘SUNPHARMA’, name: ‘Sun Pharmaceutical Industries Ltd.’},
{abbr: ‘TCS’, name: ‘Tata Consultancy Services Ltd.’},
{abbr: ‘TATAMOTORS’, name: ‘Tata Motors Ltd.’},
{abbr: ‘TATASTEEL’, name: ‘Tata Steel Ltd.’},
{abbr: ‘TECHM’, name: ‘Tech Mahindra Ltd.’},
{abbr: ‘TITAN’, name: ‘Titan Company Ltd.’},
{abbr: ‘ULTRACEMCO’, name: ‘UltraTech Cement Ltd.’},
{abbr: ‘UPL’, name: ‘UPL Ltd.’},
{abbr: ‘VEDL’, name: ‘Vedanta Ltd’},
{abbr: ‘WIPRO’, name: ‘Wipro Ltd.’},
{abbr: ‘YESBANK’, name: ‘Yes Bank Ltd.’},
{abbr: ‘ZEEL’, name: ‘Zee Entertainment Enterprises Ltd.’}
];
}
此功能将返回前 50 名股票名称及其印度股票市场的缩写。
另外，我们需要在这里再创建一个函数，那就是 matchStocks。
此功能允许我们过滤掉用户在输入区域中输入的股票。因此，当用户开始在文本框中键入时，它将与股票数组进行比较，如果找到匹配则返回并显示给用户。
所以编写第二个函数并从 data.js 文件中导出它。
// data.js

export function matchStocks(state, value) {
return (
state.name.toLowerCase().indexOf(value.toLowerCase()) !== -1 ||
state.abbr.toLowerCase().indexOf(value.toLowerCase()) !== -1
);
}
所以，现在基本上，我们在 App.js 文件中导入这些函数并将其传递给 Autocomplete 组件。
3: Autocomplete API
它具有以下属性。

value: 这是文本框的默认值，在我们的例子中，它将为空或“。
inputProps：这是一个对象。Props 传递给 props.renderInput。; 默认情况下，除非您为 props.renderInput 指定了自定义值，否则这些道具将应用于由自动完成呈现的 <input /> 元素。
wrapperStyle：它是一个对象，它具有以下的默认值。

{
display: ‘inline-block’
}

items：这是一个数据数组，在 data.js 文件中定义。在我们的例子中，它是股票市场数据。
getItemValue：用于读取项中每个条目的显示值。
shouldItemRender：这是一个功能。为项目中的每个条目调用，其返回值用于确定是否应在下拉菜单中显示。通过 de，fault 总是呈现所有项目。
onChange：这是一个函数，每次用户更改输入值时都会调用它。
onSelect：此功能在用户从下拉菜单中选择项目时调用。
renderMenu：这是函数并被调用以生成 drop-dn 菜单的渲染树。确保返回的树包含项中的每个条目，否则突出显示的顺序和键盘导航逻辑将中断。样式将包含 {top，left，minWidth}，它们是左上角的坐标和下拉菜单的宽度。
renderItem：这是函数，并为项目中的每个条目调用，它还传递 shouldItemRender 以生成下拉菜单中每个项目的渲染树。样式是一组可选样式，可用于改善下拉菜单中项目的外观。

4：将自动填充组件添加到 App.js 文件中。
所以我们的最终 App.js 文件看起来像这样。
import React, {Component} from ‘react’;
import Autocomplete from ‘react-autocomplete’;
import {getStocks, matchStocks} from ‘./data’;
import ‘./App.css’;
class App extends Component {

state = {value: ”};
render() {
return (

item.name }
shouldItemRender={matchStocks}
onChange={(event, value) => this.setState({value}) }
onSelect={value => this.setState({ value}) }
renderMenu={children => (

{children}

)}
renderItem={(item, isHighlighted) => (

{item.name}

)}
/>

);
}
}

export default App;
在这里，我们使用了前面讨论过的所有属性。其中一些仍然没有，但你可以在 Github 上查看。
我们的 data.js 文件看起来像这样。
// data.js

export function getStocks() {
return [
{abbr: ‘ADANIPORTS’, name: ‘Adani Ports & Special Economic Zone Ltd.’},
{abbr: ‘ASIANPAINT’, name: ‘Asian Paints Ltd.’},
{abbr: ‘AXISBANK’, name: ‘Axis Bank Ltd.’},
{abbr: ‘BAJAJ-AUTO’, name: ‘Bajaj Auto Ltd.’},
{abbr: ‘BAJFINANCE’, name: ‘Bajaj Finance’},
{abbr: ‘BAJAJFINSV’, name: ‘Bajaj Finserv Ltd.’},
{abbr: ‘BPCL’, name: ‘Bharat Petroleum Corporation Ltd.’},
{abbr: ‘BHARTIARTL’, name: ‘Bharti Airtel Ltd.’},
{abbr: ‘INFRATEL’, name: ‘Bharti Infratel’},
{abbr: ‘CIPLA’, name: ‘Cipla Ltd.’},
{abbr: ‘COALINDIA’, name: ‘Coal India Ltd’},
{abbr: ‘DRREDDY’, name: ‘Dr. Reddys Laboratories Ltd.’},
{abbr: ‘EICHERMOT’, name: ‘Eicher Motors Ltd.’},
{abbr: ‘GAIL ‘, name: ‘GAIL (India) Ltd.’ },
{abbr: ‘GRASIM’, name: ‘Grasim Industries Ltd.’},
{abbr: ‘HCLTECH’, name: ‘HCL Technologies Ltd.’},
{abbr: ‘HDFCBANK’, name: ‘HDFC Bank Ltd.’},
{abbr: ‘HEROMOTOCO’, name: ‘Hero MotoCorp Ltd.’},
{abbr: ‘HINDALCO’, name: ‘Hindalco Industries Ltd.’},
{abbr: ‘HINDPETRO’, name: ‘Hindustan Petroleum Corporation Ltd.’},
{abbr: ‘HINDUNILVR’, name: ‘Hindustan Unilever Ltd.’},
{abbr: ‘HDFC’, name: ‘Housing Development Finance Corporation Ltd.’},
{abbr: ‘ITC’, name: ‘I T C Ltd.’},
{abbr: ‘ICICIBANK’, name: ‘ICICI Bank Ltd.’},
{abbr: ‘IBULHSGFIN’, name: ‘Indiabulls Housing Finance’},
{abbr: ‘IOC’, name: ‘Indian Oil Corporation Ltd.’},
{abbr: ‘INDUSINDBK’, name: ‘IndusInd Bank Ltd.’},
{abbr: ‘INFY ‘, name: ‘Infosys Ltd.’},
{abbr: ‘KOTAKBANK’, name: ‘Kotak Mahindra Bank Ltd.’},
{abbr: ‘LT’, name: ‘Larsen & Toubro Ltd.’},
{abbr: ‘LUPIN’, name: ‘Lupin Ltd.’},
{abbr: ‘M&M’, name: ‘Mahindra & Mahindra Ltd.’},
{abbr: ‘MARUTI’, name: ‘Maruti Suzuki India Ltd.’},
{abbr: ‘NTPC’, name: ‘NTPC Ltd.’},
{abbr: ‘ONGC’, name: ‘Oil & Natural Gas Corporation Ltd.’},
{abbr: ‘POWERGRID’, name: ‘Power Grid Corporation of India Ltd.’},
{abbr: ‘RELIANCE’, name: ‘Reliance Industries Ltd.’},
{abbr: ‘SBIN’, name: ‘State Bank of India’},
{abbr: ‘SUNPHARMA’, name: ‘Sun Pharmaceutical Industries Ltd.’},
{abbr: ‘TCS’, name: ‘Tata Consultancy Services Ltd.’},
{abbr: ‘TATAMOTORS’, name: ‘Tata Motors Ltd.’},
{abbr: ‘TATASTEEL’, name: ‘Tata Steel Ltd.’},
{abbr: ‘TECHM’, name: ‘Tech Mahindra Ltd.’},
{abbr: ‘TITAN’, name: ‘Titan Company Ltd.’},
{abbr: ‘ULTRACEMCO’, name: ‘UltraTech Cement Ltd.’},
{abbr: ‘UPL’, name: ‘UPL Ltd.’},
{abbr: ‘VEDL’, name: ‘Vedanta Ltd’},
{abbr: ‘WIPRO’, name: ‘Wipro Ltd.’},
{abbr: ‘YESBANK’, name: ‘Yes Bank Ltd.’},
{abbr: ‘ZEEL’, name: ‘Zee Entertainment Enterprises Ltd.’}
];
}

export function matchStocks(state, value) {
return (
state.name.toLowerCase().indexOf(value.toLowerCase()) !== -1 ||
state.abbr.toLowerCase().indexOf(value.toLowerCase()) !== -1
);
}
最后，App.css 文件看起来像这样。
body {
color: #333;
font-family: “Helvetica Neue”, Arial, sans-serif;
font-weight: 200;
}

.example {
padding: 0 25px;
}

label {
display: block;
margin: 5px 0;
}

code {
padding: .2em .5em;
font-size: 85%;
background-color: rgba(0,0,0,0.04);
border-radius: 3px;
}

.menu {
position: absolute;
box-sizing: border-box;
width: 100%;
border: 1px solid #cccccc;
}

.item {
padding: 2px 6px;
cursor: default;
}

.item-highlighted {
color: white;
background-color: #4095bf;
}

.item-header {
background-color: #eeeeee;
color: #454545;
font-weight: bold;
}
保存所有文件并转到 http：// localhost：3000 /
从数据数组中键入股票，您将获得建议补全列表。

所以，最后，我们已经完成了 React Autocomplete 示例教程。感谢您的参与。

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