add error handling

examples/chat/chat/broadcast.go

@@ -5,6 +5,7 @@ import (
 	"chat/ws"
 	"context"
 	"fmt"
+	"github.com/coder/websocket"
 	"github.com/maddalax/htmgo/framework/h"
 	"github.com/maddalax/htmgo/framework/service"
 	"time"
@@ -44,7 +45,15 @@ func (m *Manager) StartListener() {
 }
 
 func (m *Manager) OnConnected(e ws.SocketEvent) {
+	room, _ := m.service.GetRoom(e.RoomId)
+
+	if room == nil {
+		m.socketManager.CloseWithError(e.Id, websocket.StatusPolicyViolation, "invalid room")
+		return
+	}
+
 	fmt.Printf("User %s connected to room %s\n", e.Id, e.RoomId)
+
 	user, err := m.queries.GetUserBySessionId(context.Background(), e.Id)
 
 	if err != nil {

examples/chat/pages/chat.$id.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"github.com/go-chi/chi/v5"
 	"github.com/maddalax/htmgo/framework/h"
-	"github.com/maddalax/htmgo/framework/hx"
 	"github.com/maddalax/htmgo/framework/js"
 )
 
@@ -18,7 +17,24 @@ func ChatRoom(ctx *h.RequestContext) *h.Page {
 					h.TriggerChildren(),
 					h.HxExtension("ws"),
 				),
+
 				h.Attribute("ws-connect", fmt.Sprintf("/ws/chat/%s", roomId)),
+
+				h.HxOnWsOpen(
+					js.ConsoleLog("Connected to chat room"),
+				),
+
+				h.HxOnWsClose(
+					js.EvalJs(`
+						const reason = e.detail.event.reason
+						if(['invalid room', 'no session'].includes(reason)) {
+							window.location.href = '/';
+						} else {
+                            console.error('Connection closed:', e.detail.event)
+						}
+					`),
+				),
+
 				h.Class("flex flex-row min-h-screen bg-neutral-100"),
 
 				// Sidebar for connected users
@@ -28,11 +44,11 @@ func ChatRoom(ctx *h.RequestContext) *h.Page {
 				h.Div(
 					h.Class("flex flex-col flex-grow gap-4 bg-white rounded p-4"),
 
-					h.OnEvent("hx-on::ws-after-message",
+					h.HxAfterWsMessage(
-						// language=JavaScript
+						js.EvalJsOnSibling("#messages",
-						js.EvalJsOnSibling("#messages", `
+							// language=JavaScript
-							element.scrollTop = element.scrollHeight;
+							`element.scrollTop = element.scrollHeight;`),
-						`)),
+					),
 
 					// Chat Messages
 					h.Div(
@@ -66,10 +82,9 @@ func MessageInput() *h.Element {
 		h.Class("p-4 rounded-md border border-slate-200 w-full"),
 		h.Name("message"),
 		h.Placeholder("Type a message..."),
-		h.HxBeforeWsSend(
+		h.HxAfterWsSend(
 			js.SetValue(""),
 		),
-		h.OnEvent(hx.KeyDownEvent, js.SubmitFormOnEnter()),
 	)
 }
 

examples/chat/partials/index.go

@@ -5,6 +5,7 @@ import (
 	"chat/components"
 	"github.com/maddalax/htmgo/framework/h"
 	"net/http"
+	"time"
 )
 
 func CreateOrJoinRoom(ctx *h.RequestContext) *h.Partial {
@@ -26,9 +27,10 @@ func CreateOrJoinRoom(ctx *h.RequestContext) *h.Partial {
 
 	var redirect = func(path string) *h.Partial {
 		cookie := &http.Cookie{
-			Name:  "session_id",
+			Name:    "session_id",
-			Value: user.SessionID,
+			Value:   user.SessionID,
-			Path:  "/",
+			Path:    "/",
+			Expires: time.Now().Add(24 * 30 * time.Hour),
 		}
 		return h.SwapManyPartialWithHeaders(
 			ctx,

examples/chat/ws/handler.go

@@ -7,6 +7,7 @@ import (
 	"github.com/go-chi/chi/v5"
 	"github.com/maddalax/htmgo/framework/h"
 	"github.com/maddalax/htmgo/framework/service"
+	"log/slog"
 	"net/http"
 )
 
@@ -14,31 +15,30 @@ func Handle() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		cc := r.Context().Value(h.RequestContextKey).(*h.RequestContext)
 
-		sessionCookie, err := r.Cookie("session_id")
+		sessionCookie, _ := r.Cookie("session_id")
-
-		cookies := r.Cookies()
-
-		println(cookies)
-		// no session
-		if err != nil {
-			return
-		}
 
 		c, err := websocket.Accept(w, r, nil)
 
-		locator := cc.ServiceLocator()
-		manager := service.Get[SocketManager](locator)
-
 		if err != nil {
 			return
 		}
 
+		if sessionCookie == nil {
+			slog.Error("session cookie not found")
+			c.Close(websocket.StatusPolicyViolation, "no session")
+			return
+		}
+
+		locator := cc.ServiceLocator()
+		manager := service.Get[SocketManager](locator)
+
 		sessionId := sessionCookie.Value
 
 		roomId := chi.URLParam(r, "id")
 
 		if roomId == "" {
-			manager.CloseWithError(sessionId, "invalid room")
+			slog.Error("invalid room", slog.String("room_id", roomId))
+			manager.CloseWithError(sessionId, websocket.StatusPolicyViolation, "invalid room")
 			return
 		}
 
@@ -52,7 +52,8 @@ func Handle() http.HandlerFunc {
 			var v map[string]any
 			err = wsjson.Read(context.Background(), c, &v)
 			if err != nil {
-				manager.CloseWithError(sessionId, "failed to read message")
+				slog.Error("failed to read message", slog.String("room_id", roomId))
+				manager.CloseWithError(sessionId, websocket.StatusInternalError, "failed to read message")
 				return
 			}
 			if v != nil {

examples/chat/ws/manager.go

@@ -106,18 +106,18 @@ func (manager *SocketManager) OnClose(id string) {
 	manager.sockets.Delete(id)
 }
 
-func (manager *SocketManager) CloseWithError(id string, message string) {
+func (manager *SocketManager) CloseWithError(id string, code websocket.StatusCode, message string) {
 	conn := manager.Get(id)
 	if conn != nil {
-		defer manager.OnClose(id)
+		go manager.OnClose(id)
-		conn.Conn.Close(websocket.StatusInternalError, message)
+		conn.Conn.Close(code, message)
 	}
 }
 
 func (manager *SocketManager) Disconnect(id string) {
 	conn := manager.Get(id)
 	if conn != nil {
-		defer manager.OnClose(id)
+		go manager.OnClose(id)
 		_ = conn.Conn.CloseNow()
 	}
 }

framework/assets/js/htmxextensions/trigger-children.ts

@@ -4,6 +4,8 @@ function kebabEventName(str: string) {
     return str.replace(/([a-z0-9])([A-Z])/g, '$1-$2').toLowerCase()
 }
 
+const ignoredEvents = ['htmx:beforeProcessNode', 'htmx:afterProcessNode', 'htmx:beforeSwap', 'htmx:afterSwap', 'htmx:beforeOnLoad', 'htmx:afterOnLoad', 'htmx:configRequest', 'htmx:configResponse', 'htmx:responseError'];
+
 function makeEvent(eventName: string, detail: any) {
     let evt
     if (window.CustomEvent && typeof window.CustomEvent === 'function') {
@@ -17,7 +19,9 @@ function makeEvent(eventName: string, detail: any) {
 }
 
 function triggerChildren(target: HTMLElement, name: string, event: CustomEvent, triggered: Set<HTMLElement>) {
-    event.detail.meta = 'trigger-children';
+    if(ignoredEvents.includes(name)) {
+        return
+    }
     if (target && target.children) {
         Array.from(target.children).forEach((e) => {
             const kehab = kebabEventName(name);
@@ -25,6 +29,7 @@ function triggerChildren(target: HTMLElement, name: string, event: CustomEvent,
             if (!triggered.has(e as HTMLElement)) {
                 if(e.hasAttribute(eventName)) {
                     const newEvent = makeEvent(eventName.replace("hx-on::", "htmx:"), event.detail)
+                    newEvent.detail.meta = 'trigger-children'
                     e.dispatchEvent(newEvent)
                     triggered.add(e as HTMLElement);
                 }

framework/assets/js/htmxextensions/ws.ts

@@ -406,12 +406,13 @@ htmx.defineExtension('ws', {
 
             // Try to create websockets when elements are processed
             case 'htmx:beforeProcessNode':
-                forEach(queryAttributeOnThisOrChildren(parent, 'ws-connect'), (child) => {
+                if(parent.hasAttribute("ws-connect")) {
-                    ensureWebSocket(child);
+                    ensureWebSocket(parent as HTMLElement);
-                });
+                }
-                forEach(queryAttributeOnThisOrChildren(parent, 'ws-send'), (child) => {
+
-                    ensureWebSocketSend(child);
+                if(parent.hasAttribute("ws-send")) {
-                });
+                    ensureWebSocketSend(parent as HTMLElement);
+                }
         }
     },
 });

framework/h/lifecycle.go

@@ -86,6 +86,34 @@ func OnEvent(event hx.Event, cmd ...Command) *LifeCycle {
 	return NewLifeCycle().OnEvent(event, cmd...)
 }
 
+func HxBeforeWsMessage(cmd ...Command) *LifeCycle {
+	return NewLifeCycle().OnEvent(hx.WsBeforeMessageEvent, cmd...)
+}
+
+func HxAfterWsMessage(cmd ...Command) *LifeCycle {
+	return NewLifeCycle().OnEvent(hx.WsAfterMessageEvent, cmd...)
+}
+
+func OnSubmit(cmd ...Command) *LifeCycle {
+	return NewLifeCycle().OnEvent(hx.SubmitEvent, cmd...)
+}
+
+func HxOnWsError(cmd ...Command) *LifeCycle {
+	return NewLifeCycle().OnEvent(hx.WsErrorEvent, cmd...)
+}
+
+func HxOnWsClose(cmd ...Command) *LifeCycle {
+	return NewLifeCycle().OnEvent(hx.WsClosedEvent, cmd...)
+}
+
+func HxOnWsConnecting(cmd ...Command) *LifeCycle {
+	return NewLifeCycle().OnEvent(hx.WsConnectingEvent, cmd...)
+}
+
+func HxOnWsOpen(cmd ...Command) *LifeCycle {
+	return NewLifeCycle().OnEvent(hx.WsConnectedEvent, cmd...)
+}
+
 func HxBeforeWsSend(cmd ...Command) *LifeCycle {
 	return NewLifeCycle().HxBeforeWsSend(cmd...)
 }
@@ -279,6 +307,16 @@ func EvalJs(js string) ComplexJsCommand {
 	return NewComplexJsCommand(js)
 }
 
+func PreventDefault() SimpleJsCommand {
+	// language=JavaScript
+	return SimpleJsCommand{Command: "event.preventDefault()"}
+}
+
+func ConsoleLog(text string) SimpleJsCommand {
+	// language=JavaScript
+	return SimpleJsCommand{Command: fmt.Sprintf("console.log('%s')", text)}
+}
+
 func SetValue(value string) SimpleJsCommand {
 	// language=JavaScript
 	return SimpleJsCommand{Command: fmt.Sprintf("this.value = '%s'", value)}
@@ -288,7 +326,10 @@ func SubmitFormOnEnter() ComplexJsCommand {
 	// language=JavaScript
 	return EvalJs(`
 		if (event.code === 'Enter') { 
-			self.form.dispatchEvent(new Event('submit', { cancelable: true })); 
+            console.log('submitting form');
+			setTimeout(() => {
+                self.form.dispatchEvent(new Event('submit', { cancelable: true })); 
+			}, 250)
 		}
 	`)
 }

framework/h/renderer.go

@@ -43,7 +43,8 @@ type RenderContext struct {
 func (ctx *RenderContext) AddScript(funcName string, body string) {
 	script := fmt.Sprintf(`
 	<script id="%s">
-		function %s(self) {
+		function %s(self, event) {
+				let e = event;
 				%s
 		}
 	</script>`, funcName, funcName, body)
@@ -223,10 +224,10 @@ func (l *LifeCycle) Render(context *RenderContext) {
 		for _, command := range commands {
 			switch c := command.(type) {
 			case SimpleJsCommand:
-				m[event] += fmt.Sprintf("%s;", c.Command)
+				m[event] += fmt.Sprintf("var self=this;var e=event;%s;", c.Command)
 			case ComplexJsCommand:
 				context.AddScript(c.TempFuncName, c.Command)
-				m[event] += fmt.Sprintf("%s(this);", c.TempFuncName)
+				m[event] += fmt.Sprintf("%s(this, event);", c.TempFuncName)
 			case *AttributeMapOrdered:
 				c.Each(func(key string, value string) {
 					l.fromAttributeMap(event, key, value, context)

framework/hx/htmx.go

@@ -110,6 +110,12 @@ const (
 	XhrProgressEvent           Event = "htmx:xhr:progress"
 	BeforeWsSendEvent          Event = "htmx:wsBeforeSend"
 	AfterWsSendEvent           Event = "htmx:wsAfterSend"
+	WsConnectedEvent           Event = "htmx:wsOpen"
+	WsConnectingEvent          Event = "htmx:wsConnecting"
+	WsClosedEvent              Event = "htmx:wsClose"
+	WsErrorEvent               Event = "htmx:wsError"
+	WsBeforeMessageEvent       Event = "htmx:wsBeforeMessage"
+	WsAfterMessageEvent        Event = "htmx:wsAfterMessage"
 
 	// RevealedEvent Misc Events
 	RevealedEvent   Event = "revealed"

framework/js/commands.go

@@ -21,7 +21,9 @@ var EvalJsOnParent = h.EvalJsOnParent
 var SetClassOnSibling = h.SetClassOnSibling
 var RemoveClassOnSibling = h.RemoveClassOnSibling
 var Remove = h.Remove
+var PreventDefault = h.PreventDefault
 var EvalJs = h.EvalJs
+var ConsoleLog = h.ConsoleLog
 var SetValue = h.SetValue
 var SubmitFormOnEnter = h.SubmitFormOnEnter
 var InjectScript = h.InjectScript

htmgo-site/md/docs/4_interactivity/2_events.md

@@ -42,6 +42,8 @@ OnClick(cmd ...Command) *LifeCycle
 HxOnAfterSwap(cmd ...Command) *LifeCycle
 HxOnLoad(cmd ...Command) *LifeCycle
 ```
+**Note:** Each command you attach to the event handler will be passed 'self' and 'event' (if applicable) as arguments.
+'self' is the current element, and 'event' is the event object.
 
 If you use the OnEvent directly, event names may be any [HTML DOM](https://www.w3schools.com/jsref/dom_obj_event.asp) events, or any [HTMX events](https://htmx.org/events/).