diff --git a/web/src/main/frontend/components/content.cljs b/web/src/main/frontend/components/content.cljs
index f3a0bb6ee..41e4acd1f 100644
--- a/web/src/main/frontend/components/content.cljs
+++ b/web/src/main/frontend/components/content.cljs
@@ -17,21 +17,27 @@
   #{:org :md :markdown
     :adoc :asciidoc})
 
+(defn lazy-load-js
+  [state]
+  (let [format (keyword (second (:rum/args state)))
+        loader? (contains? render-formats format)]
+    (when loader?
+      (when-not (format/loaded? format)
+        (format/lazy-load format)))))
+
 ;; TODO: lazy load highlight.js
 (rum/defcs html < rum/reactive
-  {:init (fn [state props]
-           (let [format (keyword (second (:rum/args state)))
-                 loader? (contains? render-formats format)]
-             (when loader?
-               (when-not (format/loaded? format)
-                 (format/lazy-load format)))
-             state))
+  {:will-mount (fn [state]
+                 (lazy-load-js state)
+                 state)
    :did-mount (fn [state]
                 (highlight!)
                 (handler/render-local-images!)
                 state)
    :did-update (fn [state]
                  (highlight!)
+                 (handler/render-local-images!)
+                 (lazy-load-js state)
                  state)}
   [state content format config]
   (let [format (format/normalize format)]
diff --git a/web/src/main/frontend/components/file.cljs b/web/src/main/frontend/components/file.cljs
index c6bebcea8..666bf74a4 100644
--- a/web/src/main/frontend/components/file.cljs
+++ b/web/src/main/frontend/components/file.cljs
@@ -17,13 +17,13 @@
         decoded-path (b64/decodeString encoded-path)]
     [encoded-path decoded-path]))
 
-(rum/defcs file <
+(rum/defcs file
   [state]
   (let [[encoded-path path] (get-path state)
-        suffix (keyword (string/lower-case (last (string/split path #"\."))))]
+        format (keyword (string/lower-case (last (string/split path #"\."))))]
     (sidebar/sidebar
      (cond
-       (and suffix (contains? handler/text-formats suffix))
+       (and format (contains? handler/text-formats format))
        [:div.content
         [:a {:href (str "/file/" encoded-path "/edit")}
          "edit"]
@@ -33,17 +33,17 @@
             [:span]
 
             content
-            (content/html content suffix org/default-config)
+            (content/html content format org/default-config)
 
             :else
             "Loading ..."))]
 
        ;; image type
-       (and suffix (contains? #{:png :jpg :jpeg} suffix))
-       (content/html [:img {:src path}] suffix org/default-config)
+       (and format (contains? #{:png :jpg :jpeg} format))
+       (content/html [:img {:src path}] format org/default-config)
 
        :else
-       [:div "Format ." (name suffix) " is not supported."]))))
+       [:div "Format ." (name format) " is not supported."]))))
 
 (defn- count-newlines
   [s]
diff --git a/web/src/main/frontend/format.cljs b/web/src/main/frontend/format.cljs
index b1f0eaffb..b5cbb786f 100644
--- a/web/src/main/frontend/format.cljs
+++ b/web/src/main/frontend/format.cljs
@@ -48,9 +48,4 @@
        (handler/set-format-js-loading! format true)
        (protocol/lazyLoad record
                           (fn [result]
-                            (handler/set-format-js-loading! format false))
-                          (fn [error]
-                            (prn format " js failed to load.")
-                            (handler/set-format-js-loading! format false)
-                            ;; TODO: notification
-                            (js/console.error error)))))))
+                            (handler/set-format-js-loading! format false)))))))
diff --git a/web/src/main/frontend/format/adoc.cljs b/web/src/main/frontend/format/adoc.cljs
index 4a88b2a26..a5c44b590 100644
--- a/web/src/main/frontend/format/adoc.cljs
+++ b/web/src/main/frontend/format/adoc.cljs
@@ -23,8 +23,7 @@
         (.convert (js/window.Asciidoctor) content (clj->js config)))))
   (loaded? [this]
     (some? (loaded?)))
-  (lazyLoad [this ok-handler error-handler]
+  (lazyLoad [this ok-handler]
     (loader/load
      "https://cdnjs.cloudflare.com/ajax/libs/asciidoctor.js/1.5.9/asciidoctor.min.js"
-     ok-handler
-     error-handler)))
+     ok-handler)))
diff --git a/web/src/main/frontend/format/markdown.cljs b/web/src/main/frontend/format/markdown.cljs
index 99c979597..a29b9f246 100644
--- a/web/src/main/frontend/format/markdown.cljs
+++ b/web/src/main/frontend/format/markdown.cljs
@@ -18,8 +18,7 @@
       (.makeHtml (js/window.showdown.Converter.) content)))
   (loaded? [this]
     (some? (loaded?)))
-  (lazyLoad [this ok-handler error-handler]
+  (lazyLoad [this ok-handler]
     (loader/load
      "https://cdnjs.cloudflare.com/ajax/libs/showdown/1.9.1/showdown.min.js"
-     ok-handler
-     error-handler)))
+     ok-handler)))
diff --git a/web/src/main/frontend/format/org_mode.cljs b/web/src/main/frontend/format/org_mode.cljs
index 9cfac8989..4c9468e20 100644
--- a/web/src/main/frontend/format/org_mode.cljs
+++ b/web/src/main/frontend/format/org_mode.cljs
@@ -27,11 +27,10 @@
       (.parseHtml js/window.MldocOrg content config)))
   (loaded? [this]
     (some? (loaded?)))
-  (lazyLoad [this ok-handler error-handler]
+  (lazyLoad [this ok-handler]
     (loader/load
      (config/asset-uri "/static/js/mldoc_org.min.js")
-     ok-handler
-     error-handler)))
+     ok-handler)))
 
 (defn parse-json
   ([content]
diff --git a/web/src/main/frontend/format/protocol.cljs b/web/src/main/frontend/format/protocol.cljs
index 98a00a71d..279086b1a 100644
--- a/web/src/main/frontend/format/protocol.cljs
+++ b/web/src/main/frontend/format/protocol.cljs
@@ -3,4 +3,4 @@
 (defprotocol Format
   (toHtml [this content config])
   (loaded? [this])
-  (lazyLoad [this ok-handler error-handler]))
+  (lazyLoad [this ok-handler]))
diff --git a/web/src/main/frontend/loader.cljs b/web/src/main/frontend/loader.cljs
index 0b68338cb..6f331d5f0 100644
--- a/web/src/main/frontend/loader.cljs
+++ b/web/src/main/frontend/loader.cljs
@@ -2,10 +2,6 @@
   (:require [goog.net.jsloader :as jsloader]
             [goog.html.legacyconversions :as conv]))
 
-(defn load [url ok-handler error-handler]
+(defn load [url ok-handler]
   (let [loader ^js (jsloader/safeLoad (conv/trustedResourceUrlFromString (str url)))]
-    (.addCallback loader
-                  (fn [result]
-                    (ok-handler result))
-                  (fn [error]
-                    (error-handler error)))))
+    (.addCallback loader ok-handler)))