diff --git a/frontend/resources/styles/main/partials/sidebar-element-options.scss b/frontend/resources/styles/main/partials/sidebar-element-options.scss
index b3f555d76..68fab3ded 100644
--- a/frontend/resources/styles/main/partials/sidebar-element-options.scss
+++ b/frontend/resources/styles/main/partials/sidebar-element-options.scss
@@ -207,6 +207,9 @@
       border-color: $color-gray-40;
     }
 
+    &.error {
+      border-color: $color-danger;
+    }
   }
 
   .input-select {
diff --git a/frontend/src/app/main/ui/workspace/sidebar/options/menus/interactions.cljs b/frontend/src/app/main/ui/workspace/sidebar/options/menus/interactions.cljs
index 881b95236..c4e86847e 100644
--- a/frontend/src/app/main/ui/workspace/sidebar/options/menus/interactions.cljs
+++ b/frontend/src/app/main/ui/workspace/sidebar/options/menus/interactions.cljs
@@ -199,8 +199,20 @@
 
         change-url
         (fn [event]
-          (let [value (-> event dom/get-target dom/get-value)]
-            (update-interaction index #(cti/set-url % value))))
+          (let [target      (dom/get-target event)
+                value       (dom/get-value target)
+                has-prefix? (or (str/starts-with? value "http://")
+                                (str/starts-with? value "https://"))
+                value       (if has-prefix?
+                              value
+                              (str "http://" value))]
+            (when-not has-prefix?
+              (dom/set-value! target value))
+            (if (dom/valid? target)
+              (do
+                (dom/remove-class! target "error")
+                (update-interaction index #(cti/set-url % value)))
+              (dom/add-class! target "error"))))
 
         change-overlay-pos-type
         (fn [event]
@@ -287,7 +299,9 @@
          (when (cti/has-url interaction)
            [:div.interactions-element
             [:span.element-set-subtitle.wide (tr "workspace.options.interaction-url")]
-            [:input.input-text {:default-value (str (:url interaction))
+            [:input.input-text {:type "url"
+                                :placeholder "http://example.com"
+                                :default-value (str (:url interaction))
                                 :on-blur change-url}]])
 
          (when (cti/has-overlay-opts interaction)
diff --git a/frontend/src/app/util/dom.cljs b/frontend/src/app/util/dom.cljs
index f2f6595bf..a207f570d 100644
--- a/frontend/src/app/util/dom.cljs
+++ b/frontend/src/app/util/dom.cljs
@@ -28,17 +28,6 @@
   [e]
   (.-target e))
 
-(defn classnames
-  [& params]
-  (assert (even? (count params)))
-  (str/join " " (reduce (fn [acc [k v]]
-                          (if (true? (boolean v))
-                            (conj acc (name k))
-                            acc))
-                        []
-                        (partition 2 params))))
-
-
 ;; --- New methods
 
 (defn set-html-title
@@ -294,10 +283,28 @@
 (defn get-root []
   (query globals/document "#app"))
 
+(defn classnames
+  [& params]
+  (assert (even? (count params)))
+  (str/join " " (reduce (fn [acc [k v]]
+                          (if (true? (boolean v))
+                            (conj acc (name k))
+                            acc))
+                        []
+                        (partition 2 params))))
+
 (defn ^boolean class? [node class-name]
   (let [class-list (.-classList ^js node)]
     (.contains ^js class-list class-name)))
 
+(defn add-class! [node class-name]
+  (let [class-list (.-classList ^js node)]
+    (.add ^js class-list class-name)))
+
+(defn remove-class! [node class-name]
+  (let [class-list (.-classList ^js node)]
+    (.remove ^js class-list class-name)))
+
 (defn child? [node1 node2]
   (.contains ^js node2 ^js node1))