How can I catch keydown event?

[loretrisolini]

How can I catch keydown event, like .on("keydown", function(){})? I can catch events like select2-open, select-close but I can't catch events like keydown.
The code below works only for close event but It does not work for keydown event.

"<select2 ng-model="fmData.data.value" s2-options="option.value as option.label for option in options"
options="optionsSelect"` id="{{item.id}}-{{fmData.name}}" style="width:100%"></select2>"

            jQuery('#'+ id)
              .on("select2-close",  function(e) {
                console.log("here");
              })
             .on("keydown", function (e) {
               console.log("keydown");
             });