Course Content

  • 4. Events

Course Content


React is a system built on the concept of components. Because all of your pages are essentially components, adding an event listener will have to take place inside of one of them. Here's an example of a component where a keydown listener could be useful: 1 import'react'; 2 3const App = (props) => 4 window

When utilising React, you usually don't need to execute addEventListener after a DOM element has been built to add listeners. Instead, when the element is first rendered, simply supply a listener. In JSX callbacks, you must be mindful about the meaning of this.

Adding a listener after the first mount and removing it when the component unmounts is a popular and straightforward use case. The useEffect hook can be used to accomplish this.

There are a number of ways in which event listeners can be implemented in React. They can be used for re-rendering on new state changes, triggering animations, or automatically updating components based on user interactions.

There are three types of event listeners in React:

  • One-time listener: A one-time listener is a function that is called only once and then stops listening.
  • Continuous listener: A continuous listener is a function that listens to the events continuously and doesn't stop listening until it's explicitly told to stop listening.
  • Timer listener: A timer listener is a function that listens for an event every X seconds or milliseconds.

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