How to check if defined Event exists in javascript?

Question

I've defined an event like this:

var event = new Event('myevent');

Is there anyway which i can check an event called 'myevent' has been defined ?
I want to have an option like this:

If an event called 'myevent' exists, attach a handler to it, else attach the handler to another event like 'myevent2' !

you don't attach listeners to events, you attach them to event targets. Whether an event targets emits a certain kind of event is a completely different story. And you haven't "defined" or "declared" a new event type, you just instantiated a new event instance in the local scope. It does not affect anything else. — Bergi
– Bergi, Commented Apr 23, 2014 at 19:36
I agree with Bergi's comments. Your question implies that maybe you don't understand how custom events work. I'd suggest you read this: developer.mozilla.org/en-US/docs/Web/Guide/Events/… — jfriend00
– jfriend00, Commented Apr 23, 2014 at 19:39
^^^ agree with those two, but you can check if the variable is defined and if the event type is myevent like this if (event && event.type == 'myevent') .... — adeneo
– adeneo, Commented Apr 23, 2014 at 19:49
Ok let me be more specific. I've wrote some kind of a plugin called "resizestop" which triggers when the window resizing has been stopped for some timeout. now i want to use this in another plugin. you can somehow say that the newer plugin requires the resizestop plugin. Now i want to check this requirement by checking if the event has been defined. any suggestion (except copy and paste resizestop code on the top of your new plugin) ? and btw thank you all for your responces — Shnd
– Shnd, Commented Apr 24, 2014 at 2:25
@adeneo one idea which pass in my head was to create a global variable and assign the event to it. but i'm not a big fan of global variables, thats why i asked it here — Shnd
– Shnd, Commented Apr 24, 2014 at 2:31

Joe Fitzgibbons · Accepted Answer · 2014-04-23 19:46:20Z

1

This will check if the event variable is and event object

if(event instanceof Event)
    //All Good lets go

answered Apr 23, 2014 at 19:46

Joe Fitzgibbons

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1 Comment

Shnd Over a year ago

Actually the event has been created in a function (it has a local scope). but i've never thought of using 'instanceof' keyword, thank you for that ;)

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