View event listeners - Javascript

Question

I'm wondering if it is possible to view

1. How many event listeners

2. What type of event listener

On a single web page.

Reason being is because I'm using off(); method.

I'm using this framework, which is basically jQuery but not.

Yeah, I'm using off but the even't isn't removing and and I have a feeling there is more than one eventListener on the element.

If it is not possible with Javascript, it is possible in the browser?

Kolosick

Answer 1

Chrome has some built in tools. If you open up the element inspector, focus on an element, scroll to the bottom of the right hand column (where the CSS/Metrics/etc are), you should see a drop down section that says Event Listeners. This can help some...

Often I find it easier to just add event listeners to some DOM element via the console and seeing if it responds. Or I throw in debuggers in various places (before setting up the listener, and inside the listener's callback). The problems I usually run into is the selector I think exists doesn't or the event gets bound too early and misses the selector.

Fix

Excellent, I did not realise that was there and provides lot's of information, Thank You. – Kolosick

Answer 2

A long time passes...

I have found something new in Chrome DevTools.

Simple as this in the console

getEventListeners(yourElement);

Documentation: https://developers.google.com/chrome-developer-tools

Kolosick

But where is the actual function definition for whatever is listening. I just see a huge object tree. I want to know what exactly is triggered by the event. – Bagel

Answer 3

You can use the Visual Event bookmarklet: http://www.sprymedia.co.uk/article/Visual+Event+2

Benedix

There is a chrome extension as well which uses the same code chrome.google.com/webstore/detail/visual-event/… – Likewise