EventListener - Web APIs 编辑

The EventListener interface represents an object that can handle an event dispatched by an EventTarget object.

Note: Due to the need for compatibility with legacy content, EventListener accepts both a function and an object with a handleEvent() property function. This is shown in the example below.

Properties

This interface neither implements, nor inherits, any properties.

Methods

This interface doesn't inherit any methods.

EventListener.handleEvent()

A function that is called whenever an event of the specified type occurs.

Example

HTML

<button id="btn">Click here!</button>

JavaScript

const buttonElement = document.getElementById('btn');

// Add a handler for the 'click' event by providing a callback function.
// Whenever the element is clicked, a pop-up with "Element clicked!" will
// appear.
buttonElement.addEventListener('click', function (event) {
  alert('Element clicked through function!');
});

// For compatibility, a non-function object with a `handleEvent` property is
// treated just the same as a function itself.
buttonElement.addEventListener('click', {
  handleEvent: function (event) {
    alert('Element clicked through handleEvent property!');
  }
});

Result

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• addEventListener