Fix getting checkbox values

Ooui/Client.js

@@ -97,7 +97,9 @@ function msgListen (m) {
             k: m.k,
         };
         if (m.k === "change" || m.k === "input") {
-            em.v = node.value;
+            em.v = (node.tagName === "INPUT" && node.type === "checkbox") ?
+                node.checked :
+                node.value;
         }
         const ems = JSON.stringify (em);
         socket.send (ems);

Ooui/Input.cs

@@ -81,7 +81,12 @@ namespace Ooui
         {
             if (message.TargetId == Id && message.MessageType == MessageType.Event && message.Key == "change") {
                 // Don't need to notify here because the base implementation will fire the event
-                val = message.Value != null ? Convert.ToString (message.Value) : "";
+                if (Type == InputType.Checkbox) {
+                    isChecked = message.Value != null ? Convert.ToBoolean (message.Value) : false;
+                }
+                else {
+                    val = message.Value != null ? Convert.ToString (message.Value) : "";
+                }
             }
             return base.TriggerEventFromMessage (message);
         }

Samples/TodoSample.cs

@@ -8,19 +8,24 @@ namespace Samples
     {
         List items = new List ();
 
-        Element MakeItem (string text)
+        class Item : ListItem
         {
-            var li = new ListItem ();
-            var check = new Input {
-                Type = InputType.Checkbox,
-            };
-            var label = new Label {
-                Text = text,
-                For = check
-            };
-            li.AppendChild (check);
-            li.AppendChild (label);
-            return li;
+            public Item (string text)
+            {
+                var check = new Input {
+                    Type = InputType.Checkbox,
+                };
+                var label = new Label {
+                    Text = text,
+                    For = check
+                };
+                check.Changed += (s,e) => {
+                    label.Style.TextDecoration = 
+                        check.IsChecked ? "line-through" : "none";
+                };
+                AppendChild (check);
+                AppendChild (label);
+            }
         }
 
         Element MakeTodo ()
@@ -30,7 +35,7 @@ namespace Samples
             button.Clicked += (s, e) => {
                 if (string.IsNullOrWhiteSpace (input.Value))
                     return;
-                var item = MakeItem (input.Value);
+                var item = new Item (input.Value);
                 items.AppendChild (item);
                 input.Value = "";
             };