closes #2427

public/src/client/chats.js

@@ -185,24 +185,26 @@ define('forum/chats', ['components', 'string', 'sounds', 'forum/infinitescroll',
 
 	Chats.sendMessage = function(toUid, inputEl) {
 		var msg = inputEl.val();
-		if (msg.length) {
-			inputEl.val('');
-			msg = msg + '\n';
-			socket.emit('modules.chats.send', {
-				touid:toUid,
-				message:msg
-			}, function(err) {
-				if (err) {
-					if (err.message === '[[error:email-not-confirmed-chat]]') {
-						return app.showEmailConfirmWarning(err);
-					}
-					return app.alertError(err.message);
+		if (msg.length > config.maximumChatMessageLength) {
+			return app.alertError('[[error:chat-message-too-long]]');
+		}
+
+		inputEl.val('');
+		msg = msg + '\n';
+		socket.emit('modules.chats.send', {
+			touid:toUid,
+			message:msg
+		}, function(err) {
+			if (err) {
+				if (err.message === '[[error:email-not-confirmed-chat]]') {
+					return app.showEmailConfirmWarning(err);
 				}
+				return app.alertError(err.message);
+			}
 
-				sounds.play('chat-outgoing');
-				Chats.notifyTyping(toUid, false);
-			});
-		}
+			sounds.play('chat-outgoing');
+			Chats.notifyTyping(toUid, false);
+		});
 	};
 
 	Chats.scrollToBottom = function(containerEl) {

public/src/modules/chat.js

@@ -440,6 +440,7 @@ define('chat', ['components', 'taskbar', 'string', 'sounds', 'forum/chats', 'tra
 		input.off('keypress').on('keypress', function(e) {
 			if (e.which === 13 && !e.shiftKey) {
 				Chats.sendMessage(chatModal.attr('touid'), input);
+				return false;
 			}
 		});
 

src/controllers/api.js

@@ -54,6 +54,7 @@ apiController.getConfig = function(req, res, next) {
 	config.usePagination = parseInt(meta.config.usePagination, 10) === 1;
 	config.disableSocialButtons = parseInt(meta.config.disableSocialButtons, 10) === 1;
 	config.disableChat = parseInt(meta.config.disableChat, 10) === 1;
+	config.maximumChatMessageLength = parseInt(meta.config.maximumChatMessageLength, 10);
 	config.maxReconnectionAttempts = meta.config.maxReconnectionAttempts || 5;
 	config.reconnectionDelay = meta.config.reconnectionDelay || 1500;
 	config.minimumTagsPerTopic = meta.config.minimumTagsPerTopic || 0;