Question

这是我的表单和onClick方法。我想在按下键盘的Enter按钮时执行此方法。怎么样？

N.B：不赞赏jquery。

 comment: function (e) {
        e.preventDefault();
        this.props.comment({comment: this.refs.text.getDOMNode().value, userPostId:this.refs.userPostId.getDOMNode().value})
    },


 <form className="commentForm">
     <textarea rows="2" cols="110" placeholder="****Comment Here****" ref="text"  /><br />
    <input type="text" placeholder="userPostId" ref="userPostId" /> <br />
     <button type="button" className="btn btn-success" onClick={this.comment}>Comment</button>
    </form>

Answer 1

将<button type="button"更改为<button type="submit"。删除onClick。相反，<form className="commentForm" onSubmit={this.onCommentSubmit}>。这应该点击按钮并按回车键。

修改：正如詹姆斯在评论中所说，你也可以在回调中拨打event.preventDefault()来停止尝试加载action网址的网页。

如果您想在回调中使用this，您可以在构造函数中使用箭头函数：onSubmit={(e) => this.onCommentSubmit(e)}或this.onCommentSubmit = this.onCommentSubmit.bind(this)，甚至可以使用e7的箭头方法onCommentSubmit = (e) => {...}。

onFormSubmit = e => {
  e.preventDefault();
  const { name, email } = this.state;
  // send to server with e.g. `window.fetch`
}

...

<form onSubmit={this.onFormSubmit}>
  ...
  <button type="submit">Submit</button>
</form>

Answer 2

使用keydown事件来执行此操作：

   input: HTMLDivElement | null = null;

   onKeyDown = (event: React.KeyboardEvent<HTMLDivElement>): void => {
      // 'keypress' event misbehaves on mobile so we track 'Enter' key via 'keydown' event
      if (event.key === 'Enter') {
        event.preventDefault();
        event.stopPropagation();
        this.onSubmit();
      }
    }

    onSubmit = (): void => {
      if (input.textContent) {
         this.props.onSubmit(input.textContent);
         input.focus();
         input.textContent = '';
      }
    }

    render() {
      return (
         <form className="commentForm">
           <input
             className="comment-input"
             aria-multiline="true"
             role="textbox"
             contentEditable={true}
             onKeyDown={this.onKeyDown}
             ref={node => this.input = node} 
           />
           <button type="button" className="btn btn-success" onClick={this.onSubmit}>Comment</button>
         </form>
      );
    }

Answer 3

如果您想听“ Enter”键，这就是您的方法。您可以使用一个onKeydown道具，您可以在react doc

中了解它。

这是codeSandbox

<nav class="navbar navbar-default">
  <div class="container-fluid">
  <ul class="nav nav-pills nav-fill">
      <li class="nav-item col-md-3">
          <a href="/people" routerLink="/people" routerLinkActive="active">People</a>
      </li>
      <li class="nav-item col-md-3">
          <a href="/planets" routerLink="/planets" routerLinkActive="active">Planets</a>
      </li>
      <li class="nav-item col-md-3">
          <a href="/starships" routerLink="/starships" routerLinkActive="active">Starships</a>
      </li>
    </ul>
    </div>
</nav>

  <select>
    <option></option>
 </select>

Answer 4

自上次回答这个问题以来已经有好几年了。 React在2017年推出了“ Hooks”，而“ keyCode”已被弃用。

现在我们可以这样写：

  useEffect(() => {
    const listener = event => {
      if (event.code === "Enter" || event.code === "NumpadEnter") {
        console.log("Enter key was pressed. Run your function.");
        // callMyFunction();
      }
    };
    document.addEventListener("keydown", listener);
    return () => {
      document.removeEventListener("keydown", listener);
    };
  }, []);

这是在第一次加载组件时在keydown事件上注册一个侦听器。销毁组件后，它将删除事件侦听器。

Answer 5

import React , {useEffect , useRef } from 'react' ; 

function Example() {

 let inp = useRef() 
 useEffect(()=>{ 
   if (!inp && !inp.current) return 
   inp.current.focus() ; 
   return () => inp = null ;  
 });
 
 const handleSubmit = () => { 
    //...  
 }

 return ( 
    <form                                                        
    onSubmit={(e) => {                                       
      e.preventDefault();                                       
      handleSubmit(e);                               
        }}                                                        > 
        <input 
           name="fakename" 
           defaultValue="...." 
           ref={inp}
           type="text"
           style={{
             position :"absolute" , 
             opacity : 0  
           }}
         />
         <button type="submit"> 
            submit
         </button>
    </form>
 )
}

有时会在popus中输入代码，因为绑定可能没有任何输入，所以仅绑定表单并把onSubmit传递给表单是行不通的。在这种情况下，如果您通过执行document.addEventListener将事件绑定到文档，这将在应用程序的其他部分引起问题，因为这可以解决此问题，我们应该包装一个表单并输入一个隐藏的CSS .. 那么您就可以通过ref集中查看该输入，从而可以正常工作。

Answer 6

如果您在 <form> 中没有表单，您可以在 componentDidMount() 中使用它：

componentDidMount = () => {
      document.addEventListener("keydown", (e) => 
        e.code === "Enter" && console.log("my function"))
    }
    
componentDidMount() //<-- remove this, it's just for testing here

Answer 7

我已经建立在@ user1032613的答案和this answer的基础上，并创建了一个“按下时输入带有查询字符串的单击元素”钩子。享受！

const { useEffect } = require("react");

const useEnterKeyListener = ({ querySelectorToExecuteClick }) => {
    useEffect(() => {
        //https://stackoverflow.com/a/59147255/828184
        const listener = (event) => {
            if (event.code === "Enter" || event.code === "NumpadEnter") {
                handlePressEnter();
            }
        };

        document.addEventListener("keydown", listener);

        return () => {
            document.removeEventListener("keydown", listener);
        };
    }, []);

    const handlePressEnter = () => {
        //https://stackoverflow.com/a/54316368/828184
        const mouseClickEvents = ["mousedown", "click", "mouseup"];
        function simulateMouseClick(element) {
            mouseClickEvents.forEach((mouseEventType) =>
                element.dispatchEvent(
                    new MouseEvent(mouseEventType, {
                        view: window,
                        bubbles: true,
                        cancelable: true,
                        buttons: 1,
                    })
                )
            );
        }

        var element = document.querySelector(querySelectorToExecuteClick);
        simulateMouseClick(element);
    };
};

export default useEnterKeyListener;

这是您的用法：

useEnterKeyListener({
    querySelectorToExecuteClick: "#submitButton",
});

https://codesandbox.io/s/useenterkeylistener-fxyvl?file=/src/App.js:399-407

Answer 8

这是非常优化的代码

useEffect(() => {
    document
        .getElementById("Your-element-id")
        .addEventListener("keydown", function (event) {
            if (event.code === "Enter" || event.code === "NumpadEnter") {
                event.preventDefault();
                document.getElementById("submit-element").click();
            }
        });
}, []);

Answer 9

例如下一个 React+TS 代码（添加用于状态等的钩子）：


type Props = {
...any properties
} & [any other type if need]

//I want notice that input data type of component maybe difference from type of props
const ExampleComponent: React.FC<Props> = (props: [Props or any other type]){
     const anySerice = new AnyService();

     const handleSubmit = async (eventForm) => {
        await anySerice.signUp();
     }

     const onKeyUp = (event: KeyboardEvent) => {
        //you can stay first condition only
        if (event.key === 'Enter' || event.charCode === 13) { 
            handleSubmit(event)
        }
    } 
    
    ...other code
    
    return (<Form noValidate validated={validated} className="modal-form-uthorize" onKeyPress={onKeyUp}>

    ...other components form

    </Form>)
}

export default ExampleComponent;

如何使用react.js中的Enter键提交表单？

9 个答案: