Call function in parent page after IFRAME is loaded using JavaScript and jQuery

hello sir , i am using iframe from a 3rd party . i have made some changes using jquery on button click 

but i want to do that automaticaly after the iframe i loaded. it works fine on button click. so  how to do that

<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
 <script type="text/javascript">
     jQuery(document).ready(function () {
         jQuery("#Button1").click(function () {
             
             $('#__jumio__iframe__clientcontainer__-iframe', window.parent.document).width('1000px');
             $('#__jumio__iframe__clientcontainer__-iframe', window.parent.document).height('400px');
             $("#__jumio__iframe__clientcontainer__-iframe").attr('scrolling', 'no');
             
             var thisIframesHeight = window.parent.$("__jumio__iframe__clientcontainer__-iframe").height();
             alert(thisIframesHeight);
         });
     });
</script>
   <script>
       jQuery(document).ready(function () {
           $("#__jumio__iframe__clientcontainer__-iframe").attr('onload', myFunction());
       });
</script>
    <script type="text/javascript">
        function myFunction() {
         
            alert("Iframe is loaded");
            document.getElementById("button1").click();
        }
    </script>
  
    
   <script type="text/javascript" src="https://resources.netverify.com/widget/jumio-verify/1.0/iframe-script.js">
</script>