Whether or not you began with the outdated on_____
property or addEventListener
, you realize that occasions drive consumer experiences in fashionable JavaScript. Should you’ve labored with occasions, you realize that preventDefault()
and stopPropagation()
are often used to deal with occasions. One factor you in all probability did not know: there is a defaultPrevented
proptery on occasions!
Contemplate the next block of code:
// Particular to a hyperlink const hyperlink = doc.querySelector('#my-link'); hyperlink.addEventListener('click on', e => e.preventDefault()); // A bigger doc scope doc.addEventListener('click on', documentClickHandler); operate documentClickHandler(occasion) { if (occasion.defaultPrevented) {// Utilizing the property // Do one factor if the clicking has been dealt with } else { // In any other case do one thing recent } }
When preventDefault
is known as on a given occasion, the defaultPrevented
property will get toggled to true
. As a result of occasion propagation, the occasion bubbles upward with this defaultPrevented
worth.
I have been dealing with occasions for 20 years and did not know this property existed till now. What’s nice about defaultPrevented
is that it stays with the occasion without having to trace observe it globally!
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