How to set selected value of jquery select2?

Question

This belong to codes prior to select2 version 4

I have a simple code of select2 that get data from ajax

Answer 1

You should use:

var autocompleteIds= $("#EventId");
autocompleteIds.empty().append('Text').val("Id").trigger('change');

// For set multi selected values
var data =  [];//Array Ids
var option =  [];//Array options of Ids above
autocompleteIds.empty().append(option).val(data).trigger('change');

// Callback handler that will be called on success
request.done(function (response, textStatus, jqXHR) {
    // append the new option
    $("#EventId").append('' + response.text + '');

    // get a list of selected values if any - or create an empty array
    var selectedValues = $("#EventId").val();
    if (selectedValues == null) {
        selectedValues = new Array();
    }
    selectedValues.push(response.id);   // add the newly created option to the list of selected items
    $("#EventId").val(selectedValues).trigger('change');   // have select2 do it's thing
});