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//1
$('#filecontainer').load(function(){
       var iframe = $('#filecontainer').contents();
       iframe.find("#choose_pics").click(function(){
              alert("test");
       });
});



//2
window.addEventListener('blur', function(e){
 if(document.activeElement == document.getElementById('Your iframe id'))
  {
   console.log('iframe click!');
  }
});


//3
$(document).ready(function(){
   $("iframe").load(function(){
       $(this).contents().on("mousedown, mouseup, click", function(){
           alert("Click detected inside iframe.");
       });
   });
});