CODEWITHSUNDEEP
javascriptreactjs
WillKre
WillKre

Reputation: 6168

Call function on keydown (Ctrl + Enter) in React

I'm making an app and I want to fire a function (in this case the showMessage) when the user presses Ctrl + Enter. How would I do this, preferably without jQuery?

import React from "react"

const App = React.createClass({
  showMessage () {
    console.log('hit');
  },
  render () {
    return (
      <div>
        <button onClick={this.showMessage}>Hit</button>
      </div>
    );
  }
});


module.exports = App;

Upvotes: 18

Views: 23145

Answers (2)

Ben Winding
Ben Winding

Reputation: 11847

Can also be done using functional components too

export function App() {
  const showMessage = () => {
    alert('SOME MESSAGE');
  };
  const keydownHandler = (e) => {
    if(e.key === 'Enter' && e.ctrlKey) showMessage()
  };
  React.useEffect(() => {
    document.addEventListener('keydown', keydownHandler);
    return () => {
      document.removeEventListener('keydown', keydownHandler);
    }
  }, []);

  return (
    <div>
      <h1>Press Ctrl+Enter</h1>
      <button onClick={showMessage}>Hit</button>
    </div>
  );
}

Upvotes: 9

Kokovin Vladislav
Kokovin Vladislav

Reputation: 10421

  1. add event listener: document.addEventListener('keydown',this.keydownHandler)

  2. then in handler check e.keyCode===13 && e.ctrlKey

  3. don't forget to remove event listener in componentWillUnmount

const App = React.createClass({
  showMessage () {
    alert('SOME MESSAGE');
  },
  keydownHandler(e){
    if(e.keyCode===13 && e.ctrlKey) this.showMessage()
  },
  componentDidMount(){
    document.addEventListener('keydown',this.keydownHandler);
  },
  componentWillUnmount(){
    document.removeEventListener('keydown',this.keydownHandler);
  },
  render () {
    return (
      <div>
        <h1>Press Ctrl+Enter</h1>
        <button onClick={this.showMessage}>Hit</button>
      </div>`
    );
  }
});
export default App;

Upvotes: 30

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