simpleChat check websocket support

Applications/SimpleChat/Web/index.html

@@ -9,35 +9,42 @@
 <input type="text" name="content" id="content" />
 <input type="button" name="submit" value="submit" id="submit"/>
 <script type="text/javascript">
-var ws = new WebSocket("ws://"+document.domain+":3636");
 var button = document.getElementById('submit');
 var panel = document.getElementById('panel');
 var content = document.getElementById('content');
-ws.onmessage = function(e)
+if(WebSocket)
 {
-    data = e.data;
-    data = eval('(' + data + ')');
-    if(data)
+    var ws = new WebSocket("ws://"+document.domain+":3636");
+    ws.onmessage = function(e)
     {
-        switch(data.type)
+        data = e.data;
+        data = eval('(' + data + ')');
+        if(data)
         {
-            case 'login':
-                panel.innerHTML += '<p>User['+data.from_id+'] login</p>';
-                break;
-            case 'say':
-                panel.innerHTML += '<p>User['+data.from_id+'] said:'+data.content+'</p>';
-                break;
-            case 'logout':
-                panel.innerHTML += '<p>User['+data.from_id+'] logout</p>';
-                break;
+            switch(data.type)
+            {
+                case 'login':
+                    panel.innerHTML += '<p>User['+data.from_id+'] login</p>';
+                    break;
+                case 'say':
+                    panel.innerHTML += '<p>User['+data.from_id+'] said:'+data.content+'</p>';
+                    break;
+                case 'logout':
+                    panel.innerHTML += '<p>User['+data.from_id+'] logout</p>';
+                    break;
+            }
         }
-    }
-};
-button.onclick = function()
+    };
+    button.onclick = function()
+    {
+        ws.send(content.value);
+        content.value = '';
+    };
+}
+else
 {
-    ws.send(content.value);
-    content.value = '';
-};
+	panel.innerHTML = '<b>This browser does not support WebSocket</b>';
+}
 </script>
 </body>
 </html>