select 2 select a value
SELECT2 V4 :
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For select2 v4 you can append directly an option/s as follow:
<select id="myMultipleSelect2" multiple="" name="myMultipleSelect2[]">
<option value="TheID" selected="selected">The text</option>
</select>
Or with JQuery:
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var $newOption = $("<option selected='selected'></option>").val("TheID")
.text("The text")
$("#myMultipleSelect2").append($newOption).trigger('change');
other example :
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$("#myMultipleSelect2").val(5).trigger('change');