Make an if for an event

i 'm trying to make an IF. If an ads event happens i have to do something but i dont know how to capture that event.

this is the code:

events:

player.ima.getAdsManager().addEventListener('loaded', function(){console.log('loaded')})
player.ima.getAdsManager().addEventListener('resume', function(){console.log('resume')})
player.ima.getAdsManager().addEventListener('complete', function(){console.log('completado')})
player.ima.getAdsManager().addEventListener('pause', function(){console.log('pausa')})
player.ima.getAdsManager().addEventListener('started', function(){console.log('started')})

i try this whit loaded event, but it dosen 't work..

if(player.ima.getAdsManager().addEventListener('loaded')){

}

How is it done? thanks!