Wie kann ich den ausgewählten Wert in jQuery Select2 programmgesteuert festlegen?

<code class="html"><input type="hidden" name="mySelect2" id="mySelect2"></h3>
<p><strong>Schritt 2: Erstellen Sie eine Select2-Instanz</strong></p>
<p>Initialisieren Sie Select2 mit den entsprechenden Optionen:</p>
<pre class="brush:php;toolbar:false"><code class="js">$("#mySelect2").select2({
  placeholder: "My Select 2",
  multiple: false,
  minimumInputLength: 1,
  ajax: {
    url: "/elements/all",
    dataType: 'json',
    quietMillis: 250,
    data: function(term, page) {
      return {
        q: term,
      };
    },
    results: function(data, page) {
      return { results: data };
    },
    cache: true
  },
  formatResult: function(element){
    return element.text + ' (' + element.id + ')';
  },
  formatSelection: function(element){
    return element.text + ' (' + element.id + ')';
  },
  escapeMarkup: function(m) {
    return m;
  }
});</code>

<code class="js">$("#mySelect2").select2('data', { id: "elementID", text: "Hello!"  });</code>

<code class="html"><select id="myMultipleSelect2" multiple="" name="myMultipleSelect2[]">
    <option value="TheID" selected="selected">The text</option>
</select></code>

<code class="js">var $newOption = $("<option selected='selected'></option>").val("TheID").text("The text");
$("#myMultipleSelect2").append($newOption).trigger('change');</code>

<code class="js">$("#myMultipleSelect2").val(5).trigger('change');</code>