Here's the JSFiddle for what u needed JSFiddle. Here in the code you can use your own div id like you have used in your case, in the src field. Your code was missing the extra function call which would be made when we close the popup.

Here in the code, a function call is made before closing the popup as you needed. Hope this helps.

Yep, I have find solution for me by parsing jquery object :-)

You can directly redeclare callbacks methods by using this

$.magnificPopup.instance.st.callbacks = {
    close: function() {
         alert('test3')
       }
    }

before using $.magnificPopup.open

thanks for help)

So just in case someone needs this answered, i had to add the following code to my new popup.

// a button that closes the popup
$('#cancel-logbook-entry-btn').click(function(){
$.magnificPopup.proto.close.call(this);
});

$.magnificPopup.instance.close = function () {

 //code to show the original popup
};

And then in the original popup i had to add otherwise it will never close the popup

 $.magnificPopup.instance.close = function () {
       // "proto" variable holds MagnificPopup class prototype
       // The above change that we did to instance is not applied to the prototype, 
       // which allows us to call parent method:
       $.magnificPopup.proto.close.call(this);
  };   

You can override the close method. By modifying the instance, you will only change the functionality of this specific popup. Then simply call the original close method to finish the job.

$('#upload').magnificPopup({
  type:'inline',
  callbacks: {
    open: function() {
      $.magnificPopup.instance.close = function() {
        // Do whatever else you need to do here
        var confirmed = confirm("Are you sure you want to close?");
        if(!confirmed) {
          return;
        }

        // Call the original close method to close the popup
        $.magnificPopup.proto.close.call(this);
      };
    }
  }
});

For Magnific Popup v0.9.8

var magnificPopup = $.magnificPopup.instance,
              cur = magnificPopup.st.el;
console.log(cur.attr('myatt'));

Unfortunately Magnific Popup internally uses triggerHandler() rather than trigger() to implement custom events ,so there is no event for the document to "listen to" so this may never work with current versions

$(document).on('mfpClose', '.multiselect-modal', function () {
console.log('test');
});

There is one fix but that requires you to create global events which is a bad practise so i advice you to make use of callbacks which is close in your case goes like this

$.magnificPopup.instance.close = function() {

//do your stuff here

//this calls the original close to close popup
//you may well comment it out which would totally disable the close button or execute conditional in if else 
$.magnificPopup.proto.close.call();
};

these are some properties 

//property 

magnificPopup.currItem // current item
magnificPopup.index // current item index 

// Navigation
magnificPopup.next(); // go to next item
magnificPopup.prev(); // go to prev item
magnificPopup.goTo(4); // go to slide #4

You can override the close method. By modifying the instance, you will only change the functionality of this specific popup. Then simply call the original close method to finish the job.

$('#upload').magnificPopup({
  type:'inline',
  callbacks: {
    open: function() {
      $.magnificPopup.instance.close = function() {
        // Do whatever else you need to do here
        var confirmed = confirm("Are you sure you want to close?");
        if(!confirmed) {
          return;
        }

        // Call the original close method to close the popup
        $.magnificPopup.proto.close.call(this);
      };
    }
  }
});