Lightweight event delegation
This is a fork of the popular delegate with some improvements:
- modern: ES6, TypeScript, Edge 15+ (it uses
WeakMapandElement.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
npm install delegate-it
// This module is only offered as a ES Module
import delegate from 'delegate-it';delegate(document.body, '.btn', 'click', event => {
console.log(event.delegateTarget);
});delegate('.container', '.btn', 'click', event => {
console.log(event.delegateTarget);
});delegate(document.querySelectorAll('.container'), '.btn', 'click', event => {
console.log(event.delegateTarget);
});const delegation = delegate(document.body, '.btn', 'click', event => {
console.log(event.delegateTarget);
});
delegation.destroy();Note: selectors are always treated as multiple elements, even if one or none are matched. delegate() will return an array.
const delegations = delegate('.container', '.btn', 'click', event => {
console.log(event.delegateTarget);
});
delegations.forEach(function (delegation) {
delegation.destroy();
});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 |
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- select-dom - Lightweight
querySelector/Allwrapper that outputs an Array. - doma - Parse an HTML string into
DocumentFragmentor oneElement, in a few bytes. - Refined GitHub - Uses this module.