如何使用refs在React与Typescript

我使用Typescript与React。我有麻烦理解如何使用参考，以获得静态类型和智能感知的反应节点引用的参考。我的代码如下。

import * as React from 'react';

interface AppState {
    count: number;
}

interface AppProps {
    steps: number;
}

interface AppRefs {
    stepInput: HTMLInputElement;
}

export default class TestApp extends React.Component<AppProps, AppState> {

constructor(props: AppProps) {
    super(props);
    this.state = {
        count: 0
    };
}

incrementCounter() {
    this.setState({count: this.state.count + 1});
}

render() {
    return (
        <div>
            <h1>Hello World</h1>
            <input type="text" ref="stepInput" />
            <button onClick={() => this.incrementCounter()}>Increment</button>
            Count : {this.state.count}
        </div>
    );
}}

当前回答

要像React文档中推荐的那样使用回调样式(https://facebook.github.io/react/docs/refs-and-the-dom.html)，你可以在类中添加一个属性定义:

export class Foo extends React.Component<{}, {}> {
// You don't need to use 'references' as the name
references: {
    // If you are using other components be more specific than HTMLInputElement
    myRef: HTMLInputElement;
} = {
    myRef: null
}
...
 myFunction() {
    // Use like this
    this.references.myRef.focus();
}
...
render() {
    return(<input ref={(i: any) => { this.references.myRef = i; }}/>)
}

2017-01-22 03:26:42

其他回答

class SelfFocusingInput extends React.Component<{ value: string, onChange: (value: string) => any }, {}>{
    ctrls: {
        input?: HTMLInputElement;
    } = {};
    render() {
        return (
            <input
                ref={(input) => this.ctrls.input = input}
                value={this.props.value}
                onChange={(e) => { this.props.onChange(this.ctrls.input.value) } }
                />
        );
    }
    componentDidMount() {
        this.ctrls.input.focus();
    }
}

把它们放在一个对象中

2016-08-01 10:35:49

首先添加一个导入

import React, { useRef } from "react";

那么这个

const studentCapacityRef = useRef<HTMLInputElement>(null);

或者这个

const studentCapacityRef = useRef<HTMLAreaElement>(null);

或者这个

const studentCapacityRef = useRef<HTMLDivElement>(null);

等等……

2022-09-20 11:27:10

由于缺乏完整的示例，下面是我的小测试脚本，用于在使用React和TypeScript时获取用户输入。部分基于其他评论和此链接https://medium.com/@basarat/strong -typed-refs-for-react-typescript-9a07419f807#.cdrghertm

/// <reference path="typings/react/react-global.d.ts" />

// Init our code using jquery on document ready
$(function () {
    ReactDOM.render(<ServerTime />, document.getElementById("reactTest"));
});

interface IServerTimeProps {
}

interface IServerTimeState {
    time: string;
}

interface IServerTimeInputs {
    userFormat?: HTMLInputElement;
}

class ServerTime extends React.Component<IServerTimeProps, IServerTimeState> {
    inputs: IServerTimeInputs = {};

    constructor() {
        super();
        this.state = { time: "unknown" }
    }

    render() {
        return (
            <div>
                <div>Server time: { this.state.time }</div>
                <input type="text" ref={ a => this.inputs.userFormat = a } defaultValue="s" ></input>
                <button onClick={ this._buttonClick.bind(this) }>GetTime</button>
            </div>
        );
    }

    // Update state with value from server
    _buttonClick(): void {
    alert(`Format:${this.inputs.userFormat.value}`);

        // This part requires a listening web server to work, but alert shows the user input
    jQuery.ajax({
        method: "POST",
        data: { format: this.inputs.userFormat.value },
        url: "/Home/ServerTime",
        success: (result) => {
            this.setState({ time : result });
        }
    });
}

}

2016-05-12 08:50:01

对于typescript用户，不需要构造函数。

...

private divRef: HTMLDivElement | null = null

getDivRef = (ref: HTMLDivElement | null): void => {
    this.divRef = ref
}

render() {
    return <div ref={this.getDivRef} />
}

...

2019-06-07 05:26:57

在这种情况下，我总是这样做抓住裁判

输入:htmlinterment =反应。

2017-04-04 20:26:16

如何使用refs在React与Typescript

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