How to add data via $.ajax ( serialize() + extra data ) like this

I want to add extra data after i use $('#myForm').serialize() + extra data

$.ajax({
   type: 'POST',
   url: $('#myForm').attr('action'),
   data: $('#myForm').serialize(),   // I WANT TO ADD EXTRA DATA + SERIALIZE DATA
   success: function(data){
      alert(data);
      $('.tampil_vr').text(data);
   }
});

What kind of data?

data: $('#myForm').serialize() + "&moredata=" + morevalue

The "data" parameter is just a URL encoded string. You can append to it however you like. See the API here.

Personally, I'd append the element to the form instead of hacking the serialized data, e.g.

moredata = 'your custom data here';

// do what you like with the input
$input = $('<input type="text" name="moredata"/>').val(morevalue);

// append to the form
$('#myForm').append($input);

// then..
data: $('#myForm').serialize()

That way, you don't have to worry about ? or &

You can do it like this:

postData[postData.length] = { name: "variable_name", value: variable_value };