1 files changed, 20 insertions, 6 deletions
diff --git a/public/gallery.js b/public/gallery.js
index 299d372..9d3b067 100644
--- a/public/gallery.js
+++ b/public/gallery.js
@@ -1,14 +1,25 @@
 'use strict'
 
+let callActive = false
+let callFaulty = false
+
 function call(method, params) {
-	// TODO: Make it apparent when results result in errors:
-	//  - With responseType == "json", m.request() always expects JSON,
-	//    and error.message is null if it fails, but we can handle it manually.
-	//  - Go can wrap all errors into trivial strings before writing.
+	// XXX: At least with POST, unsuccessful requests result
+	// in catched errors containing Errors with a null message.
+	// This is an issue within XMLHttpRequest.
+	callActive++
 	return m.request({
 		method: "POST",
 		url: `/api/${method}`,
 		body: params,
+	}).then(result => {
+		callActive--
+		callFaulty = false
+		return result
+	}).catch(error => {
+		callActive--
+		callFaulty = true
+		throw error
 	})
 }
 
@@ -72,8 +83,11 @@ let Header = {
 		return m('.header', {}, [
 			m('nav', main),
 			m('nav', context),
-			// TODO: End it with an activity indicator.
-			m('.activity', '☺'),
+			callFaulty
+				? m('.activity.error[title=Error]', '●')
+				: callActive
+					? m('.activity[title=Busy]', '●')
+					: m('.activity[title=Idle]', '○'),
 		])
 	},
 }