Motivated by the absolutely valid remarks by @FritsvanCampen, I sat my ass down and figured out a way myself: What I really needed was a way to access the currently selected val, even if it hadn't changed. By using select2's undocumented close-event instead of change, I can access just that like so:

function onSelectChange(event){
    alert( $("#select").select2("val") );
};

$("#select").select2().bind('close', onSelectChange);

Find an updated jsFiddle at http://jsfiddle.net/rb6pH/42/

I think you might refer to this link, i stuck once in same situation,

Change event is not fired when the selection is changed using Select2's val() method.

The event object contains the following custom properties:

val

the current selection (taking into account the result of the change) - id or array of ids.

added

the added element, if any - the full element object, not just the id

removed

the removed element, if any - the full element object, not just the id

For more information you might refer to this.

Thanks!

I read the question and it's so close to my problem so I decided not to post another question. What I want to do is after select2 closed, a simple text input become focused but it doesn't work. please check

function onSelectChange(){
    alert('closed');
    $('#hey').focus();
};

$("#select").select2().bind('close', onSelectChange);
$('#hey').on('focusin)', function(){alert('in');}

http://jsfiddle.net/sobhanattar/x49F2/5/

I tried to make sure that the input become focused and it showed that the input become focused but I don't know why it doesn't show the curser

a little old question but i spent a few hours last week to find a solution.

I am using Select2 version: 4.0.5.

My working solution is this one:

$("#exampleId").on("select2:open", function() {
    var checkExist = setInterval(function() {
        var $selectedChoiceInsideSelect2Dropdown = $("li.select2-results__option[id^='select2-" + exampleId + "-result'][aria-selected=true]");
        if ($selectedChoiceInsideSelect2Dropdown.length) {
            $selectedChoiceInsideSelect2Dropdown.on("mouseup", function() {
                $(this).trigger("change");
            });
            clearInterval(checkExist);
        }
    }, 100); // check every 100ms
});

It's very important to use the interval!

 var prev_val = $('#select2').val();
 $('#select2').blur( function() {
    if( $(this).val() == prev_val )
       // not changed
    else {
       // changed
       prev_val = $(this).val();
    }
 });