fix onunload preventdefault in non-curried modules

mithril.js

@@ -234,6 +234,7 @@ var m = (function app(window, undefined) {
 			if (data.controller) {
 				var module = data
 				var controller = cached.controller || new (module.controller || function() {})
+				if (controller.onunload) unloaders.push({controller: controller, handler: controller.onunload})
 				data = module.view(controller)
 				if (!data.tag) throw new Error(module.view.toString() + "\n\nThis template must return a virtual element, not an array, string, etc.")
 			}
@@ -506,9 +507,7 @@ var m = (function app(window, undefined) {
 	var FRAME_BUDGET = 16; //60 frames per second = 1 call per 16 ms
 	function submodule(module, args) {
 		var controller = function() {
-			var instance = module.controller.apply(this, args) || this
-			if (instance.onunload) unloaders.push({controller: instance, handler: instance.onunload})
-			return instance
+			return module.controller.apply(this, args) || this
 		}
 		var view = function(ctrl) {
 			if (arguments.length > 1) args = args.concat([].slice.call(arguments, 1))

tests/mithril-tests.js

@@ -350,6 +350,80 @@ function testMithril(mock) {
 		
 		return count === 1
 	})
+	test(function() {
+		//calling preventDefault from component's onunload should prevent route change
+		mock.requestAnimationFrame.$resolve()
+		mock.location.search = "?"
+
+		var root = mock.document.createElement("div")
+		var loaded = false
+		var testEnabled = true
+		var module = {
+			controller: function() {},
+			view: function() {
+				return m.module(sub)
+			}
+		}
+		var sub = {
+			controller: function(opts) {
+				controller = this
+				this.onunload = function(e) {if (testEnabled) e.preventDefault()}
+			},
+			view: function() {
+				return m("div")
+			}
+		}
+		m.route(root, "/a", {
+			"/a": module,
+			"/b": {controller: function() {loaded = true}, view: function() {}}
+		})
+		
+		mock.requestAnimationFrame.$resolve()
+		
+		m.route("/b")
+		
+		mock.requestAnimationFrame.$resolve()
+		testEnabled = false
+		
+		return loaded === false
+	})
+	test(function() {
+		//calling preventDefault from non-curried component's onunload should prevent route change
+		mock.requestAnimationFrame.$resolve()
+		mock.location.search = "?"
+
+		var root = mock.document.createElement("div")
+		var loaded = false
+		var testEnabled = true
+		var module = {
+			controller: function() {},
+			view: function() {
+				return sub
+			}
+		}
+		var sub = {
+			controller: function(opts) {
+				controller = this
+				this.onunload = function(e) {if (testEnabled) e.preventDefault()}
+			},
+			view: function() {
+				return m("div")
+			}
+		}
+		m.route(root, "/a", {
+			"/a": module,
+			"/b": {controller: function() {loaded = true}, view: function() {}}
+		})
+		
+		mock.requestAnimationFrame.$resolve()
+		
+		m.route("/b")
+		
+		mock.requestAnimationFrame.$resolve()
+		testEnabled = false
+		
+		return loaded === false
+	})
 
 	//m.withAttr
 	test(function() {