dfpDetectIframeEmpty.js

<script type='text/javascript'>
     $(document).ready(function(){

          var checkIframe = setInterval(function bringSecondPhase(){

               if (iframeIsLoaded){
                    clearInterval(checkIframe)
                    console.log("iframe loaded!")
                    iframeHasAdvertismentAndShowOrHide()
               }
               else{
                    console.log("iframe checking...")
               }

          },1000)


          function iframeIsLoaded(){
               var $iframe = $('#div-gpt-ad-AD_UNIT_NAME-1').find('iframe')
               
               return $iframe.length > 0
          }

          function iframeHasAdvertismentAndShowOrHide(){
               var $iframe = $('#div-gpt-ad-AD_UNIT_NAME-1').find('iframe')

               if (iframeIsLoaded()){

                    var $iframeBody = $iframe.contents().find('body')

                    if (typeof $iframeBody == "undefined" || $iframeBody.html() == ""){
                         console.log("iframe empty!")
                         $iframe.width(0)
                         $iframe.height(0)
                         $('#advertismentSticker').hide()

                    }
                    else {
                         console.log("iframe with creative!")
                         $('#advertismentSticker').show()
                    }
               }
     }
          
     })
</script>