React / Typescript：this.setState不是一個函數

Question

我是第一次在React + Typescript中工作。

interface IState {
  stateval: number;
}
class Forgotpassword extends React.Component<any, IState> {
  constructor(props: any){
    super(props);
    this.state = { stateval: 1 };
  }
  public submit() {  
    this.setState({ stateval:2 });
  }
  public render() {
    const { stateval} = this.state;
    return (
      <div className="App">
        <Button onClick={this.submit}>Send OTP</Button>
      </div>
    );
  }
}

當我單擊提交按鈕時，它會拋出

Uncaught TypeError: this.setState is not a function

Answer 1

無需添加構造函數方法或使用bind。 箭頭功能可以滿足您的需求。

import React, { Component } from 'react';

interface IState {
  stateval: number;
}

export default class Forgotpassword extends Component<any, IState> {
  state = {
    stateval: 2
  }

  public submit = () => this.setState({ stateval: 2 });

  public render() {
    return (
      <div className="App">
        <Button onClick={this.submit}>Send OTP</Button>
      </div>
    );
  }
}

Answer 2

您需要將功能綁定或方法轉換為

interface IState {
  stateval: number;
}
class Forgotpassword extends React.Component<any, IState> {
  constructor(props: any){
    super(props);
    this.state = { stateval: 1 };
  }
  const submit = () => {  
    this.setState({ stateval:2 });
  }
  const render = () => {
    const { stateval} = this.state;
    return (
      <div className="App">
        <Button onClick={this.submit}>Send OTP</Button>
      </div>
    );
  }
}

我希望它有用

Answer 3

請將您的Submit函數綁定到此：

this.submit = this.submit.bind（this）