topic map.on vs dojo/on in ArcGIS JavaScript Maps SDK Questions

map.on vs dojo/on

CurtisSpurlock — Mon, 12 May 2014 18:08:03 GMT

map.on("load", doSomething);

on(map, "load", doSomething);

Is there a difference between the above statements. I've seen both in the samples and I was curious.

Re: map.on vs dojo/on

ReneRubalcava — Sat, 11 Dec 2021 06:59:19 GMT

For just listening for events, no.
Map extends dojo/Evented, so that allows you to do use it like map.on() to listen for events. It also allows you to use dojo/on to listen for events on the map.

The added benefit of using dojo/on is it provides a little more utility, like pausable handlers.

var handler = on.pausable(map, 'click', method);
handler.pause();
// some other stuff happens
handler.resume();

Or you could listen to events only once.

on.once(map, 'load', method);

So it all depends on what you are looking to do. I would recommend using the dojo/on method, simply for consistency as you will probably use it to listen for other events as well.

Re: map.on vs dojo/on

CurtisSpurlock — Tue, 13 May 2014 17:08:37 GMT

Great! Thanks for the information.

Re: map.on vs dojo/on

TracySchloss — Tue, 13 May 2014 20:10:36 GMT

I'm stuck with having to have my code work in IE 8, and I've had less problems with map.on syntax vs the on syntax. I really wish we could get off it as our default browser, but for now we're stuck with it. At least now they let users have something besides IE!