how to change select2 value programmatically

Question

I have a select2 box in bootstrap modal, I want to change the value of the select2 box but it didn't work.

I tried every single solution in previous posts and results but none of them got it work.

I use select2 4.0.2, I tested:

$('#select_id').val('val').trigger('change.select2');

$('#select_id').val('val').trigger('change');

$('#select_id').val('val').change()

It works one or two times then it stops working (randomly)

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It works fine only when I change the select2 back to 3.x.x

Answer 1

$('#select_id').val('val').trigger('change');

is the right way, see here