React Hooks 与点击按钮答案

【问题标题】：React Hooks with button on clicksReact Hooks 与点击按钮
【发布时间】：2022-01-05 04:38:03
【问题描述】：

我刚开始使用 React 钩子并尝试使用 3 个可以单击的按钮，它应该告诉我它被单击了多少次。我可以让它们分别工作，但这并不高效。

因此，我一直在寻找仅使用两个类来使其有用：一个用于按钮，另一个用于柜台部分。但现在我正在努力调用函数并分离（单击哪个）按钮。

import React, { useState } from "react";
import Counter from "./Counter";
const Buttons = () => {
  const HandleClick = () => {
    setCounter(count + 1);
  };
  const [count, setCounter] = useState(0);
  return (
    <div>
      <button className={"GoodBtn"} onClick={HandleClick}>
        Good
      </button>
      <button className={"NeutralBtn"} onClick={HandleClick}>
        Neutral
      </button>
      <button className={"BadBtn"} onClick={HandleClick}>
        Bad
      </button>
    </div>
  );
};

export default Buttons;

import React, { useState } from "react";
import Buttons from "./Buttons";

const Counter = () => {
  const [count, setCount] = useState(0);
  const teller = () => count + 1;
  return (
    <div>
      <h2>Statistics</h2>
      <p>Good {Buttons.count}</p>
      <p>Neutral {Buttons.count}</p>
      <p>Bad {Buttons.count}</p>
    </div>
  );
};

export default Counter;

【问题讨论】：

标签： javascript reactjs web react-hooks webstorm

【解决方案1】：

import React, { useState } from 'react';
import Counter from "./Counter";
const Buttons = () => {
    const[count,setCounter]= useState({
         good: 0,
         neutral: 0,
         bad: 0
    });

     const HandleClick = (key) =>{
         setCounter(state => ({...state, [key]: state[key] + 1}));
     }

     return (
         <div>
             <button className={"GoodBtn"} onClick={HandleClick('good')}>Good</button>
             <button className={"NeutralBtn"} onClick={HandleClick('neutral')}>Neutral</button>
             <button className={"BadBtn"} onClick={HandleClick('bad')}>Bad</button>
        
         <Counter counts={count} />
       </div>
    )
}

export default Buttons;




import React, { useState } from 'react';
import Buttons from "./Buttons";

const Counter = (props) => {
    return(
        <div>
            <h2>Statistics</h2>
            <p>Good {props.counts.good}</p>
            <p>Neutral {props.counts.neutral}</p>
            <p>Bad {props.counts.bad}</p>
        </div>
    )
}

export default Counter;

【讨论】：

【解决方案2】：

你不能只做Buttons.count。 Buttons 是一个 React 组件，需要先创建，比如：<Buttons />。

如果你想用计数器包裹你的按钮组件，你可以这样做：

const CountableButton = ({ onCounterChange, ...props }) => {
  const [count, setCounter] = useState(0);

  const handleClick = (event) => {
    //to correctly change state variable based on previous value
    setCounter((prevCounter) => prevCounter + 1); 
  };

  //Every time count changes trigger the onCounterChange function
  React.useEffect(() => {
    onCounterChange(count);
  }, [count]);

  return (
    <button {...props} onClick={handleClick}>
      Good
    </button>
  );
};

你会像这样使用它：


const App = () => {
  const [count, setCount] = useState(0);

  return (
    <div>
      <h2>Button clicked {count} times</h2>
      <CountableButton onCounterChange={(value) => setCount(value)} />
    </div>
  );
};

【讨论】：