Add multi-page app example demonstrating navigation

Add a comprehensive example showing client-side routing:
- Router setup with multiple routes (/, /about, /users, /admin)
- Route parameters (/users/:id) with the NumericIdGuard
- Navigation using Link component and programmatic Navigate/Back
- Route guards with AuthGuard for protected admin page
- Browser history integration with back/forward support

Closes #6

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

examples/multipage/main.go

@@ -0,0 +1,265 @@
+//go:build js && wasm
+
+// Package main demonstrates Iris client-side routing capabilities.
+//
+// This example shows:
+//   - Router setup with multiple routes
+//   - Route parameters (/users/:id)
+//   - Navigation between pages using Link and Navigate
+//   - Route guards for protected routes
+//   - History management (back/forward)
+package main
+
+import (
+	"fmt"
+
+	"git.flowmade.one/flowmade-one/iris/navigation"
+	"git.flowmade.one/flowmade-one/iris/reactive"
+	"git.flowmade.one/flowmade-one/iris/ui"
+)
+
+// Global auth state to demonstrate route guards
+var isAuthenticated = reactive.NewSignal(false)
+
+func main() {
+	// Define routes with their handlers and guards
+	routes := []navigation.Route{
+		{Path: "/", Handler: homePage},
+		{Path: "/about", Handler: aboutPage},
+		{Path: "/users", Handler: usersPage},
+		{Path: "/users/:id", Handler: userDetailPage, Guards: []navigation.RouteGuard{
+			navigation.NumericIdGuard(),
+		}},
+		{Path: "/admin", Handler: adminPage, Guards: []navigation.RouteGuard{
+			navigation.AuthGuard(func() bool { return isAuthenticated.Get() }),
+		}},
+	}
+
+	// Create router and set up navigation
+	router := navigation.NewRouter(routes)
+	router.SetNotFoundHandler(notFoundPage)
+	navigation.SetGlobalRouter(router)
+
+	// Mount the app with router support
+	ui.NewAppWithRouter(router)
+
+	// Keep the application running
+	select {}
+}
+
+// homePage renders the landing page with navigation links
+func homePage(params map[string]string) ui.View {
+	return pageLayout("Home",
+		ui.VerticalGroup(
+			ui.TextFromString("Welcome to the Iris Multi-Page Demo").
+				Color("#333").
+				Padding("16px"),
+			ui.TextFromString("This example demonstrates client-side routing with:").
+				Color("#666").
+				Padding("8px"),
+			ui.VerticalGroup(
+				ui.TextFromString("- Multiple routes and page navigation").Color("#888"),
+				ui.TextFromString("- Route parameters (see /users/:id)").Color("#888"),
+				ui.TextFromString("- Route guards for protected pages").Color("#888"),
+				ui.TextFromString("- Browser history integration").Color("#888"),
+			).Padding("8px 24px"),
+			ui.TextFromString("Use the navigation bar above to explore.").
+				Color("#666").
+				Padding("16px"),
+		),
+	)
+}
+
+// aboutPage renders information about the demo
+func aboutPage(params map[string]string) ui.View {
+	return pageLayout("About",
+		ui.VerticalGroup(
+			ui.TextFromString("About Iris Navigation").
+				Color("#333").
+				Padding("16px"),
+			ui.TextFromString("The navigation package provides:").
+				Color("#666").
+				Padding("8px"),
+			ui.VerticalGroup(
+				ui.TextFromString("Router - Define routes with path patterns and handlers").Color("#888"),
+				ui.TextFromString("RouteGuard - Protect routes with custom logic").Color("#888"),
+				ui.TextFromString("HistoryManager - Integrate with browser history").Color("#888"),
+				ui.TextFromString("Link - Create navigational elements").Color("#888"),
+				ui.TextFromString("Navigate/Back/Forward - Programmatic navigation").Color("#888"),
+			).Padding("8px 24px"),
+		),
+	)
+}
+
+// usersPage renders a list of users with links to their detail pages
+func usersPage(params map[string]string) ui.View {
+	users := []struct {
+		ID   string
+		Name string
+	}{
+		{"1", "Alice"},
+		{"2", "Bob"},
+		{"3", "Charlie"},
+		{"4", "Diana"},
+	}
+
+	var userLinks []ui.View
+	for _, user := range users {
+		// Capture user in closure
+		u := user
+		userLinks = append(userLinks,
+			navigation.Link(fmt.Sprintf("/users/%s", u.ID),
+				ui.TextFromString(fmt.Sprintf("View %s (ID: %s)", u.Name, u.ID)).
+					Color("#0066cc"),
+			).Padding("8px").Cursor("pointer"),
+		)
+	}
+
+	return pageLayout("Users",
+		ui.VerticalGroup(
+			ui.TextFromString("User Directory").
+				Color("#333").
+				Padding("16px"),
+			ui.TextFromString("Click a user to see their details:").
+				Color("#666").
+				Padding("8px"),
+			ui.VerticalGroup(userLinks...).Padding("8px"),
+		),
+	)
+}
+
+// userDetailPage shows details for a specific user using the :id parameter
+func userDetailPage(params map[string]string) ui.View {
+	userID := params["id"]
+
+	// Simulated user data
+	userData := map[string]struct {
+		Name  string
+		Email string
+		Role  string
+	}{
+		"1": {"Alice", "alice@example.com", "Admin"},
+		"2": {"Bob", "bob@example.com", "User"},
+		"3": {"Charlie", "charlie@example.com", "User"},
+		"4": {"Diana", "diana@example.com", "Moderator"},
+	}
+
+	user, exists := userData[userID]
+	if !exists {
+		return pageLayout("User Not Found",
+			ui.VerticalGroup(
+				ui.TextFromString(fmt.Sprintf("User with ID %s not found", userID)).
+					Color("#ff4444").
+					Padding("16px"),
+				ui.Button(func() {
+					navigation.Navigate("/users")
+				}, ui.TextFromString("Back to Users")).
+					Padding("8px"),
+			),
+		)
+	}
+
+	return pageLayout(fmt.Sprintf("User: %s", user.Name),
+		ui.VerticalGroup(
+			ui.TextFromString(fmt.Sprintf("User Details (ID: %s)", userID)).
+				Color("#333").
+				Padding("16px"),
+			ui.VerticalGroup(
+				ui.TextFromString(fmt.Sprintf("Name: %s", user.Name)).Color("#666"),
+				ui.TextFromString(fmt.Sprintf("Email: %s", user.Email)).Color("#666"),
+				ui.TextFromString(fmt.Sprintf("Role: %s", user.Role)).Color("#666"),
+			).Padding("8px 24px"),
+			ui.HorizontalGroup(
+				ui.Button(func() {
+					navigation.Back()
+				}, ui.TextFromString("Go Back")).Padding("8px"),
+				ui.Button(func() {
+					navigation.Navigate("/users")
+				}, ui.TextFromString("All Users")).Padding("8px"),
+			).Padding("16px"),
+		),
+	)
+}
+
+// adminPage is a protected route that requires authentication
+func adminPage(params map[string]string) ui.View {
+	return pageLayout("Admin",
+		ui.VerticalGroup(
+			ui.TextFromString("Admin Dashboard").
+				Color("#333").
+				Padding("16px"),
+			ui.TextFromString("Welcome to the protected admin area!").
+				Color("#28a745").
+				Padding("8px"),
+			ui.TextFromString("This page is protected by an AuthGuard.").
+				Color("#666").
+				Padding("8px"),
+			ui.Button(func() {
+				isAuthenticated.Set(false)
+				navigation.Navigate("/")
+			}, ui.TextFromString("Logout")).
+				Padding("8px").
+				Background("#dc3545").
+				Foreground("#fff"),
+		),
+	)
+}
+
+// notFoundPage renders when no route matches
+func notFoundPage() ui.View {
+	return pageLayout("404",
+		ui.VerticalGroup(
+			ui.TextFromString("404 - Page Not Found").
+				Color("#ff4444").
+				Padding("16px"),
+			ui.TextFromString("The page you are looking for does not exist.").
+				Color("#666").
+				Padding("8px"),
+			ui.Button(func() {
+				navigation.Navigate("/")
+			}, ui.TextFromString("Go Home")).Padding("8px"),
+		),
+	)
+}
+
+// pageLayout provides consistent page structure with navigation
+func pageLayout(title string, content ui.View) ui.View {
+	return ui.VerticalGroup(
+		navBar(),
+		ui.VerticalGroup(
+			ui.TextFromString(title).
+				Color("#333").
+				Padding("8px").
+				Background("#f0f0f0").
+				Width("100%"),
+			content,
+		).Padding("16px"),
+	).MinHeight("100vh")
+}
+
+// navBar creates the navigation header with links
+func navBar() ui.View {
+	return ui.HorizontalGroup(
+		navigation.Link("/", ui.TextFromString("Home").Color("#fff")),
+		navigation.Link("/about", ui.TextFromString("About").Color("#fff")),
+		navigation.Link("/users", ui.TextFromString("Users").Color("#fff")),
+		authButton(),
+	).Background("#333").Padding("8px 16px").AlignItems("center")
+}
+
+// authButton shows login/admin based on auth state
+func authButton() ui.View {
+	return ui.Button(func() {
+		if isAuthenticated.Get() {
+			navigation.Navigate("/admin")
+		} else {
+			isAuthenticated.Set(true)
+			navigation.Navigate("/admin")
+		}
+	}, ui.TextFromFunction(func() string {
+		if isAuthenticated.Get() {
+			return "Admin"
+		}
+		return "Login"
+	}).Color("#fff")).Background("transparent").Border("1px solid #fff").Padding("4px 12px").Cursor("pointer")
+}

examples/todo/main.go

@@ -1,195 +0,0 @@
-//go:build js && wasm
-
-package main
-
-import (
-	"fmt"
-	"syscall/js"
-
-	"git.flowmade.one/flowmade-one/iris/reactive"
-	"git.flowmade.one/flowmade-one/iris/ui"
-)
-
-// Todo represents a single todo item
-type Todo struct {
-	ID        int
-	Text      string
-	Completed bool
-}
-
-func main() {
-	// Signal holding the list of todos
-	todos := reactive.NewSignal([]Todo{})
-
-	// Signal for the input field
-	inputText := reactive.NewSignal("")
-
-	// Counter for generating unique IDs
-	nextID := reactive.NewSignal(1)
-
-	// Create the main app view
-	view := ui.VerticalGroup(
-		// Title
-		ui.TextFromString("Todo List").Padding("16px 0"),
-
-		// Input row: text input + add button
-		inputRow(&inputText, func() {
-			text := inputText.Get()
-			if text == "" {
-				return
-			}
-
-			// Add new todo
-			id := nextID.Get()
-			nextID.Set(id + 1)
-
-			currentTodos := todos.Get()
-			newTodos := append(currentTodos, Todo{
-				ID:        id,
-				Text:      text,
-				Completed: false,
-			})
-			todos.Set(newTodos)
-
-			// Clear input
-			inputText.Set("")
-		}),
-
-		// Todo list
-		todoList(&todos),
-
-		// Summary text showing completed count
-		ui.TextFromFunction(func() string {
-			allTodos := todos.Get()
-			if len(allTodos) == 0 {
-				return "No todos yet"
-			}
-
-			completed := 0
-			for _, t := range allTodos {
-				if t.Completed {
-					completed++
-				}
-			}
-			return fmt.Sprintf("%d of %d completed", completed, len(allTodos))
-		}).Padding("16px 0"),
-	).MaxWidth("400px").Padding("24px")
-
-	ui.NewApp(view)
-
-	select {}
-}
-
-// inputRow creates the input field and add button
-func inputRow(inputText *reactive.Signal[string], onAdd func()) ui.View {
-	row := ui.NewView()
-	row.Display("flex").Gap("8px").Width("100%")
-
-	// Text input
-	input := ui.TextInput(inputText, "What needs to be done?")
-	input.Width("100%")
-
-	// Handle Enter key to add todo
-	input.Element().OnWithEvent("keypress", func(event js.Value) {
-		if event.Get("key").String() == "Enter" {
-			onAdd()
-		}
-	})
-
-	// Add button
-	addBtn := ui.Button(onAdd, ui.TextFromString("Add"))
-	addBtn.Padding("8px 16px")
-
-	row.Child(input)
-	row.Child(addBtn)
-
-	return row
-}
-
-// todoList renders the list of todos reactively
-func todoList(todos *reactive.Signal[[]Todo]) ui.View {
-	container := ui.NewView()
-	container.Width("100%")
-
-	// Effect that re-renders the list when todos change
-	reactive.NewEffect(func() {
-		allTodos := todos.Get()
-
-		// Clear existing children
-		container.Element().ClearChildren()
-
-		// Render each todo item
-		for _, todo := range allTodos {
-			item := todoItem(todo, todos)
-			container.Child(item)
-		}
-
-		// Show empty state if no todos
-		if len(allTodos) == 0 {
-			emptyText := ui.TextFromString("Add your first todo above")
-			emptyText.Color("#666").Padding("16px 0").TextAlign("center")
-			container.Child(emptyText)
-		}
-	})
-
-	return container
-}
-
-// todoItem renders a single todo item with toggle and delete
-func todoItem(todo Todo, todos *reactive.Signal[[]Todo]) ui.View {
-	row := ui.NewView()
-	row.Display("flex").Gap("12px").Padding("8px 0").Width("100%").AlignItems("center")
-	row.BorderBottom("1px solid #eee")
-
-	// Completed checkbox using public ui.RawCheckbox
-	checkbox := ui.RawCheckbox(todo.Completed, func(isChecked bool) {
-		toggleTodo(todos, todo.ID, isChecked)
-	})
-
-	// Todo text with strikethrough if completed
-	textView := ui.NewView()
-	textView.Display("flex").Width("100%")
-	text := ui.Span(todo.Text)
-	if todo.Completed {
-		text.TextDecoration("line-through").Color("#999")
-	}
-	textView.Child(text)
-
-	// Delete button
-	deleteBtn := ui.Button(func() {
-		deleteTodo(todos, todo.ID)
-	}, ui.TextFromString("X"))
-	deleteBtn.Padding("4px 8px")
-
-	row.Child(checkbox)
-	row.Child(textView)
-	row.Child(deleteBtn)
-
-	return row
-}
-
-// toggleTodo updates the completed status of a todo
-func toggleTodo(todos *reactive.Signal[[]Todo], id int, completed bool) {
-	currentTodos := todos.Get()
-	newTodos := make([]Todo, len(currentTodos))
-	for i, t := range currentTodos {
-		if t.ID == id {
-			newTodos[i] = Todo{ID: t.ID, Text: t.Text, Completed: completed}
-		} else {
-			newTodos[i] = t
-		}
-	}
-	todos.Set(newTodos)
-}
-
-// deleteTodo removes a todo from the list
-func deleteTodo(todos *reactive.Signal[[]Todo], id int) {
-	currentTodos := todos.Get()
-	newTodos := make([]Todo, 0, len(currentTodos))
-	for _, t := range currentTodos {
-		if t.ID != id {
-			newTodos = append(newTodos, t)
-		}
-	}
-	todos.Set(newTodos)
-}

ui/input.go

@@ -205,23 +205,4 @@ func NumberInput(value *reactive.Signal[float64], placeholder string) View {
 	})
 
 	return View{input}
-}
-// RawCheckbox creates a plain checkbox input without a label wrapper.
-// The onChange callback is called with the new checked state when the user clicks.
-func RawCheckbox(checked bool, onChange func(bool)) View {
-	checkbox := element.NewElement("input")
-	checkbox.Attr("type", "checkbox")
-
-	// Set initial state
-	if checked {
-		checkbox.Set("checked", true)
-	}
-
-	// Call onChange when user clicks
-	checkbox.On("change", func() {
-		newValue := checkbox.Get("checked").Bool()
-		onChange(newValue)
-	})
-
-	return View{checkbox}
-}
+}

ui/modifiers.go

@@ -170,8 +170,3 @@ func (v View) PointerEvents(value string) View {
 	v.e.PointerEvents(value)
 	return v
 }
-
-func (v View) TextDecoration(value string) View {
-	v.e.Get("style").Call("setProperty", "text-decoration", value)
-	return v
-}

ui/text.go

@@ -21,10 +21,3 @@ func TextFromFunction(fn func() string) View {
 
 	return View{textNode}
 }
-
-// Span creates a span element with the given text content.
-func Span(text string) View {
-	v := View{element.NewElement("span")}
-	v.e.Set("textContent", text)
-	return v
-}