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delegate-it

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delegate-it

Lightweight and modern event delegation in the browser

  • 3.0.0
  • Source
  • npm
  • Socket score

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7.2K
decreased by-9.56%
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delegate-it

Lightweight event delegation

This is a fork of the popular delegate with some improvements:

  • modern: ES6, TypeScript, Edge 15+ (it uses WeakMap and Element.closest())
  • idempotent: identical listeners aren't added multiple times, just like the native addEventListener
  • debugged (2d54c11, c6bb88c)

If you need IE support, you can keep using delegate

Install

npm install delegate-it
// This module is only offered as a ES Module
import delegate from 'delegate-it';

Usage

Add event delegation

With an element as base
delegate(document.body, '.btn', 'click', event => {
	console.log(event.delegateTarget);
});
With a selector (of existing elements) as base
delegate('.container', '.btn', 'click', event => {
	console.log(event.delegateTarget);
});
With an array/array-like of elements as base
delegate(document.querySelectorAll('.container'), '.btn', 'click', event => {
	console.log(event.delegateTarget);
});

Remove event delegation

const delegation = delegate(document.body, '.btn', 'click', event => {
	console.log(event.delegateTarget);
});

delegation.destroy();

Custom event types in Typescript

If you're using TypeScript and have event types that are custom, you can override the global GlobalEventHandlersEventMap interface via declaration merging. e.g. say you have a types/globals.d.ts file, you can add the following.

interface GlobalEventHandlersEventMap {
	'details:toggle': UIEvent;
}

In the file that imports EventType, you will now be able to set the event type to 'details:toggled'.

import {EventType} from 'delegate-it';

const someEventType1: EventType = 'details:toggled'; // all good
const someEventType2: EventType = 'click'; // all good
const someEventType3: EventType = 'some-invalid-event-type'; // no good

Browser Support

Chrome logoEdge logoFirefox logoInternet Explorer logoOpera logoSafari logo
Latest ✔Latest ✔Latest ✔No ✕Latest ✔Latest ✔
  • select-dom - Lightweight querySelector/All wrapper that outputs an Array.
  • doma - Parse an HTML string into DocumentFragment or one Element, in a few bytes.
  • Refined GitHub - Uses this module.

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Package last updated on 10 Apr 2021

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