[PDF] explain event handlers in javascript

What is event handler in JavaScript?

Event handlers can be used to handle and verify user input, user actions, and browser actions: And more ... Many different methods can be used to let JavaScript work with events: You can assign your own event handler functions to HTML elements And more ...

What is a JavaScript event?

An HTML event can be something the browser does, or something a user does. Often, when events happen, you may want to do something. JavaScript lets you execute code when events are detected. HTML allows event handler attributes, with JavaScript code, to be added to HTML elements.

How to react to an event in JavaScript?

To react to an event, you attach an event handler to it. This is a block of code (usually a JavaScript function that you as a programmer create) that runs when the event fires. When such a block of code is defined to run in response to an event, we say we are registering an event handler .

How does a browser handle an event?

The browser notifies the system that something has happened, and that it needs to be handled. It gets handled by registering a function, called an event handler, that listens for a particular type of event. What does it mean to "handle an event"?