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on javascript Code Snippet in 2024

browsereventintermediate

Last Updated: 13 July 2024

Adds an event listener to an element with the ability to use event delegation.

  • Use EventTarget.addEventListener() to add an event listener to an element.
  • If there is a target property supplied to the options object, ensure the event target matches the target specified and then invoke the callback by supplying the correct this context.
  • Omit opts to default to non-delegation behavior and event bubbling.
  • Returns a reference to the custom delegator function, in order to be possible to use with off.
const on = (el, evt, fn, opts = {}) => { const delegatorFn = e => e.target.matches(opts.target) && fn.call(e.target, e); el.addEventListener( evt, opts.target ? delegatorFn : fn, opts.options || false ); if (opts.target) return delegatorFn; };
const fn = () => console.log('!'); on(document.body, 'click', fn); // logs '!' upon clicking the body on(document.body, 'click', fn, { target: 'p' }); // logs '!' upon clicking a `p` element child of the body on(document.body, 'click', fn, { options: true }); // use capturing instead of bubbling

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