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TinyEvents

TinyEvents is a tiny event utility library for modern browsers(IE 11+). Supports jQuery like syntax. Just 1 kb gzipped.

Event namespace support - Easily remove event handlers
Works with collection of elements
Custom events support
Add or remove multiple events at a time.
Easy event delegation
Attach event listeners to dynamically added element
And more. Just 1 kb

Codepen Demo - https://codepen.io/sachinchoolur/pen/zYwaMqy

Installation

TinyEvents is available on NPM, Yarn, and GitHub. You can use any of the following method to download tinyEvents

NPM - NPM is a package manager for the JavaScript programming language. You can install tiny-events.js using the following command
```
npm install tiny-events.js
```
YARN - Yarn is another popular package manager for the JavaScript programming language. If you prefer you can use Yarn instead of NPM
```
yarn add tiny-events.js
```
GitHub - You can also directly download tinyevents from GitHub

Usage example

<button class="change-bg">Change background color</button>
<button class="change-color">Change color</button>
<button class="remove-btn">Remove click</button>
<span id="color-code">#FFF</span>

import tinyEvents from 'tinyevents';

tinyEvents(".change-bg").on("click.sample mouseover.sample", () => {
  const color = getRandomColor();
  document.body.style.backgroundColor = color;
  triggerColorChange(color);
});

tinyEvents(".change-color").on("click.sample", () => {
  const color = getRandomColor();
  document.body.style.color = color;
  triggerColorChange(color);
});

tinyEvents(".remove-btn").on("click", () => {
  tinyEvents(".change-bg, .change-color").off(".sample");
});

tinyEvents("#color-code").on("color-change", (event) => {
  const { color } = event.detail;
  document.getElementById("color-code").innerHTML = color;
});

function getRandomColor() {
  return "#" + Math.floor(Math.random() * 16777215).toString(16);
}

function triggerColorChange(color) {
  // Custom events demo
  tinyEvents("#color-code").trigger("color-change", {
    color
  });
}

API

on - Attach an event handler function for one or more events to the selected elements.
off - Remove an event handlers.
one - Attach a handler to an event for the elements. The handler is executed at most once per element per event type.
trigger - Execute all handlers and behaviors attached to the matched elements for the given event type.

On

Attach an event handler function for one or more events to the selected elements.

import $ from 'tinyevents';

$('.btn').on('click.bg mouseover.bg', () => {
    document.body.style.backgroundColor = 'red';
});

$('.btn').on('my-custom-event', (e) => {
    console.log(e.detail)
});

Delegation

Event delegation is an event handling technique where, instead of attaching event handlers directly to every element you want to listen to events on, you attach a single event handler to a parent element of those elements to listen for events occurring on it’s descendant elements

By passing a selector as the second argument to on() method, the event handler will fire only if the event is triggered on the selector

import tinyEvents from 'tinyevents';

tinyEvents('body').on('mousemove', 'span', () => {
    console.log('Hovering over span');
});

Off

Remove event handlers.

tinyEvents('.btn').on('click.bg hover.bg', () => {
    document.body.style.backgroundColor = 'red';
});

// Removes both click and hover event handlers
tinyEvents('.btn').off('click.bg hover.bg');

// Removes event handlers by namespace
// Removes both click and hover event handlers
tinyEvents('.btn').off('.bg');

// Removes all click events handlers that were attached with .on()
tinyEvents('.btn').off('click');

// Another example with multiple namespaces
tinyEvents('.btn').on('click.abc', () => {
    document.body.style.color = 'red';
});
tinyEvents('.btn').on('click.xyz', () => {
    document.body.style.backgroundColor = 'yellow';
});

// Removes both event handlers
tinyEvents('.btn').off('.abc .xyz');

One

Attach a handler to an event for the elements. The handler is executed at most once per element per event type.

tinyEvents('.btn').one('click', () => {
    alert('This will be displayed only once.');
});

// or

tinyEvents('ul').one('click', 'li', () => {
    alert('This will be displayed only once.');
});

Trigger

Execute all handlers and behaviors attached to the matched elements for the given event type.

tinyEvents('.btn').trigger('click');

tinyEvents('.btn').on('my-custom-event', (event) => {
    // prints 'custom-event'
    console.log(event.detail.type)
});

tinyEvents('.btn').trigger('my-custom-event', {
  type: 'custom-event',
  purpose: 'some text'
});

Story

I built the initial version of tinyEvents during the development of lightGallery. lightGallery 2.0 is completely re-written from scratch in vanilla JavaScript which was dependent on jQuery earlier. It was very difficult to keep track of all event listeners, making use of event delegation, and using custom events in vanilla JS while it is very easy with jQuery. So I wrote this tiny library which supports jQuery-like syntax and functionalities and is still less than 1 kb.

P.S. I'm working on an other tool that automatically finds and replaces jQuery methods with vanilla javascript methods. Watch the repo to get notified

sachinchoolur/tiny-events.js