Question

I press button after that appears div in which shows “loading” and loads iframe.
So, showing div I can do via jQuery, but how to load iframe after event?

Here is my working code as i want

Answer 1

Set the src attribute of the iframe the moment you want it to start loading (set it to "" by default):

$('#my-button').click(function() {
  $('iframe#myIframe').attr('src', url);
});

You can also handle events for when the iframe finishes loading:

$('iframe#myIframe').load(function() {
  // do stuff...
});