selectize.cljs

(defn selectize
  [options settings]
  (let [id
        (util/rand-uuid)
        get-selectize
        (fn [] (.-selectize (aget (js/$ (str "#" id)) 0)))
        selectize!
        (fn [this]
          (let [[_ options _ _ ] (reagent/argv this)]
            (.selectize
             (js/$ (str "#" id))
             (clj->js (assoc settings :options (vec (:options options)))))
            (.setValue (get-selectize) (clj->js (:defaults options)))))]
    (reagent/create-class
     {:component-did-mount selectize!
      :component-will-unmount #(.destroy (get-selectize))
      :render (fn [] [:input {:id id}])})))

usage.cljs

[selectize
       {:defaults []
        :options []} ;; options and default selected
       {:plugins ["remove_button"] ;; all other selectize settings
        :onChange update!} 
 ]