Select2 doesn't show selected value

Question

Select2 loads all items from my list successful, the issue I found when try to select a specific value when page loads. Example:

:: put select2 in a specific html element, no value is selected even all items are loaded.

$('#my_id').select2();

:: When the page is loaded I'm trying to show a specific item selected, but doesn't work as expected, because even selected, the select2 doesn't show it.

$('#my_id').val('3'); //select the right option, but doesn't render it on page loads.

How to make a selected option to pop up when pages loads?

Thanks in advance.

#UPDATED

:: How I load all select2 items (sorry, its jade, not pure HTML):

label(for='category') Category
    span.required *
select(id='category', style='width:230px', name='category')
    option(value='') - Select -
    each cat in categories
        option(value='#{cat.id}') #{cat.description}

P.S.: All items from my list are loaded.

:: How I initialize the select2:

Just put the following line code on my javascript and it does successful:

$('#category').select2();

:: How I'm trying to select a specific value:

• First attempt:

    $('#category').select2(
        {
            initSelection: function(element, callback) {
                callback($('#field-category').val());
            }
        }
    );
  

• Second attempt:

    $('#category').val($('#field-category').val());
  

P.S.: #field-category has a value its a hidden input field and works OK.

Answer 1

You need to use the initSelection option to set the initial value.

If you are using a pre-defined select element to create the select2, you can use the following method

$('select').select2().select2('val','3')

Demo: Fiddle