JS EVENTS /// DOM INTERACTION /// MOUSE KEYBOARD FORMS /// REACT ONCLICK /// JS EVENTS /// DOM INTERACTION /// MOUSE KEYBOARD FORMS /// REACT ONCLICK ///

Common JS Events

Interactivity is everything. Learn to capture and process Mouse, Keyboard, and Form actions to make your UI alive.

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Tutor:Welcome to the Events tutorial! In JavaScript and React, 'events' are actions that happen in the browser, like a user clicking a button or pressing a key.


Event Matrix

UNLOCK NODES BY HANDLING EVENTS.

Mouse Events

Capture user clicks, hovers, and movements. The most critical is the click event.

Event Validation Check

What is the standard event name for when a user clicks an element in vanilla JS?

Community Holo-Net

Event Handlers Showcase

ACTIVE

Built an awesome interactive form or key-combo tracker? Share it with the community.

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JavaScript & React Events

Author

Pascual Vila

Frontend Instructor // Code Syllabus

A website without events is just a poster. Events bring your application to life, allowing it to react to user inputs such as clicks, keyboard presses, and form submissions.

Mouse Events

Mouse events fire when the user interacts with the pointing device. The most famous one is click. In vanilla JavaScript, you use addEventListener('click', ...). In React, we use the camelCase version: onClick directly on the JSX element.

Other useful mouse events include mouseenter (when the mouse hovers over an element) and mouseleave.

Keyboard Events

Keyboard events track keystrokes. You commonly attach these to the global document or specific input fields. The events are keydown (key pressed) and keyup (key released).

The Event Object (e) passed to the callback function contains vital information, specifically e.key, which tells you exactly which character or action key (like 'Enter' or 'Escape') was pressed.

Form Events

Forms are the backbone of user data input. The submit event triggers when a form is sent. However, natively, browsers refresh the page to send the data to a server.

In modern web development (like React apps), we want to handle data via JavaScript (e.g., using fetch API) without refreshing. To stop the browser from its default behavior, you must call e.preventDefault() inside your submit handler.

Events Glossary

Event

An action or occurrence recognized by software, often originating asynchronously from the external environment (like a user click).

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addEventListener

A method that sets up a function that will be called whenever the specified event is delivered to the target.

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Event Object (e)

An object passed to event handlers that contains properties and methods describing the event.

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e.preventDefault()

Tells the user agent that if the event does not get explicitly handled, its default action should not be taken as it normally would be.

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e.target

A reference to the object onto which the event was dispatched. Useful for getting input values.

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React Synthetic Events

React's cross-browser wrapper around the browser's native event. They are camelCased (e.g., onClick).

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