Here the plunker - http://plnkr.co/edit/n9kJ8cerRpX4yBFDinXQ?p=preview Seems problem in https://github.com/edcarroll/ng2-semantic-ui/blob/1cebf2a8cdc8762c74daa3a079dd4d7fefde95d6/src/modules/dropdown/directives/dropdown.ts#L121 - when focus element removed, execute `focusout` event with : `e.relatedTarget === null`