Needed a select element with multiple="true". After much digging finally came 
up with a way to handle them. Code below. Curious if anyone has a better way. 

The relevant code starts at (let [options...

(defn update-data
  [item owner k]
  (let [node (om/get-node owner (name k))
        v (if (-> node .-multiple)
            (let [options (.-options node)]
              (areduce options i ret []
                       (if (.-selected (aget options i))
                         (conj ret (.-value (aget options i)))
                         ret)))
            (-> node .-value string/trim))
        validators (om/get-shared owner [:tree-config (:type @item) :validators 
k])]
    (when-not (= v (k @item))
      (om/transact! item k (fn [i] v)))))


Cheers,

Jamie

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