CODE EXAMPLE FOR JAVASCRIPT

ngx-doc-viewer

function reloadIFrame() {
var iframe = document.getElementById("iFrame");
  console.log(frame.contentDocument.URL); //work control
  if(iframe.contentDocument.URL == "about:blank"){
    iframe.src =  iframe.src;
  }
}
var timerId = setInterval("reloadIFrame();", 2000);

$( document ).ready(function() {
    $('#menuiFrame').on('load', function() {
        clearInterval(timerId);
        console.log("Finally Loaded"); //work control
    });
});