jquery - How to handle nested event listeners javascript? (not about nested html elements) -

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i need function trigger after 2 events. first event onload, , second onmessage coming iframe.

if onload , onmessage=="something"=> trigger that. otherwise => else.

however, seems onload executed before onmessage. need 2 event nested. (or not?)

shoud this:

     document.getelementbyid("myiframe").addeventlistener("load", iframeloaded, false);          function iframeloaded(){         window.top.addeventlistener("message", whatisthemessage, false);         }      function whatisthemessage(event){  window.top.removeeventlistener("message", whatisthemessage, false);      if(event.date=="something"){//do something}     else if(event.date=="somethingelse"){//do somethingelse}     }

does seem correct? problem appear me if "message" arriving before (i think not not possible), don't listen it.

window.addeventlistener("load",test,false); window.addeventlistener("message",test,false); var counter=0;  function test(event){   counter++;   if(counter==2){    //two event listeners called   }  }

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