Detect Passive Events
Detect if the browser supports passive event listeners.
Live detection test
Exports a reference to a singleton object (a micro state machine with an update function) with its state set to if the browser supports passive event listeners, as well as an update()
function which re-runs the tests and updates the object's state.
Note that the code used in the detection is adapted from this Passive Events Explainer.
detectPassiveEvents
micro state machine
const detectPassiveEvents = {
hasSupport: boolean,
update() {...},
}
Installing detect-passive-events
$ npm install detect-passive-events
Using detect-passive-events
import detectPassiveEvents from 'detect-passive-events';
if (detectPassiveEvents.hasSupport === true) {
document.addEventListener('scroll', handleScroll, { capture: false, passive: true });
}
if (detectPassiveEvents.hasSupport === false) {
document.addEventListener('scroll', handleScroll, false);
}
detectPassiveEvents.update();
Note that the update()
function is run once at the time of import to set the object's initial state, and generally doesn't need to be run again. If it doesn't have access to the window
, then the state will be undefined
(detect-passive-events
will not throw an error), and you will need to call the update()
function manually at a later time to update its state.
Part of the detect-it
family