diff --git a/css/glowingbear.css b/css/glowingbear.css
index 312ef04..62a10fb 100644
--- a/css/glowingbear.css
+++ b/css/glowingbear.css
@@ -708,6 +708,30 @@ img.emojione {
     width: auto;
 }
 
+#toast {
+  position: fixed;
+  left: 50%;
+  bottom: 50px;
+  width: 250px;
+  margin-left: -125px;
+
+  text-align: center;
+  border-radius: 3px;
+  padding: 10px 15px;
+  z-index: 100;
+  animation: fadein 0.5s, fadeout 0.5s 4.5s;
+}
+
+@keyframes fadein {
+  from { bottom: 0;    opacity: 0; }
+  to   { bottom: 50px; opacity: 1; }
+}
+
+@keyframes fadeout {
+  from { bottom: 50px; opacity: 1; }
+  to   { bottom: 0;    opacity: 0; }
+}
+
 .glyphicon-spin {
   -webkit-animation: spin 1000ms infinite linear;
   animation: spin 1000ms infinite linear;
diff --git a/css/themes/base16-default.css b/css/themes/base16-default.css
index b30a08a..2324240 100644
--- a/css/themes/base16-default.css
+++ b/css/themes/base16-default.css
@@ -423,6 +423,10 @@ button.close:hover {
     color: var(--base01);
 }
 
+#toast {
+    background-color: var(--base01);
+}
+
 /****************************/
 /* Weechat colors and style */
 /****************************/
diff --git a/css/themes/blue.css b/css/themes/blue.css
index c093a43..cb666bc 100644
--- a/css/themes/blue.css
+++ b/css/themes/blue.css
@@ -134,6 +134,13 @@ input[type=text], input[type=password], #sendMessage, .badge, .btn-send, .btn-se
    border: 1px solid #363943;
 }
 
+#toast {
+    background-color: #283244;
+    border: 1px solid;
+    border-color: rgb(29, 94, 152);
+    border-radius: 0px;
+}
+
 .horizontal-line {
     -webkit-box-shadow: rgba(255, 255, 255, 0.07) 0 1px 0;
     -moz-box-shadow: rgba(255, 255, 255, 0.07) 0 1px 0;
diff --git a/css/themes/dark.css b/css/themes/dark.css
index b6d1a08..4d845fe 100644
--- a/css/themes/dark.css
+++ b/css/themes/dark.css
@@ -2126,6 +2126,10 @@ code {
   color: #fff;
 }
 
+#toast {
+    background-color: #333;
+}
+
 /* */
 /* Mobile layout */
 /* */
diff --git a/css/themes/light.css b/css/themes/light.css
index 31a2368..900404d 100644
--- a/css/themes/light.css
+++ b/css/themes/light.css
@@ -2092,6 +2092,10 @@ input[type=text].is-invalid{
     font-weight: bold;
 }
 
+#toast {
+    background-color: #ddd;
+}
+
 /* */
 /* Mobile layout */
 /* */
diff --git a/js/inputbar.js b/js/inputbar.js
index ceb2265..656a4a7 100644
--- a/js/inputbar.js
+++ b/js/inputbar.js
@@ -217,6 +217,18 @@ weechat.directive('inputBar', function() {
                 // Extract nick from bufferline prefix
                 var nick = prefix[prefix.length - 1].text;
 
+                // Check whether the user is still online
+                var buffer = models.getBuffer(bufferline.buffer);
+                var is_online = buffer.queryNicklist(nick);
+                if (!is_online) {
+                    // show a toast that the user left
+                    var toast = document.createElement('div');
+                    toast.id = "toast";
+                    toast.innerHTML = nick + " has left the room";
+                    document.body.appendChild(toast);
+                    setTimeout(function() { document.body.removeChild(toast); }, 5000);
+                }
+
                 var newValue = $scope.command || '';  // can be undefined, in that case, use the empty string
                 var addColon = newValue.length === 0;
                 if (newValue.length > 0) {
diff --git a/js/models.js b/js/models.js
index 469bdaf..1ebc411 100644
--- a/js/models.js
+++ b/js/models.js
@@ -308,6 +308,19 @@ models.service('models', ['$rootScope', '$filter', 'bufferResume', function($roo
             return nicklist.hasOwnProperty('root');
         };
 
+        // Check whether a particular nick is in the nicklist
+        var queryNicklist = function(nick) {
+            for (var groupIdx in nicklist) {
+                var nicks = nicklist[groupIdx].nicks;
+                for (var nickIdx in nicks)  {
+                    if (nicks[nickIdx].name === nick) {
+                        return true;
+                    }
+                }
+            }
+            return false;
+        };
+
         /* Clear all our buffer lines */
         var clear = function() {
             while(lines.length > 0) {
@@ -353,6 +366,7 @@ models.service('models', ['$rootScope', '$filter', 'bufferResume', function($roo
             isNicklistEmpty: isNicklistEmpty,
             nicklistRequested: nicklistRequested,
             pinned: pinned,
+            queryNicklist: queryNicklist,
         };
 
     };