[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"academy-blogs-en-1-1-all-read-receipts-websocket-chat-all--*":3,"academy-blog-translations-q37y3cwja1kppep":99},{"data":4,"page":87,"perPage":87,"totalItems":87,"totalPages":87},[5],{"alt":6,"collectionId":7,"collectionName":8,"content":9,"cover_image":10,"cover_image_path":11,"created":12,"created_by":13,"expand":14,"id":94,"keywords":95,"locale":69,"published_at":96,"scheduled_at":13,"school_blog":91,"short_description":97,"status":89,"title":6,"updated":98,"updated_by":13,"slug":92,"views":93},"EP.42 Adding Read Receipts Feature in WebSocket Chat","sclblg987654321","school_blog_translations","\u003Ch3>Why Have Read Receipts in WebSocket Chat?\u003C\u002Fh3>\u003Cp>\u003Cstrong>Read Receipts\u003C\u002Fstrong> are an essential feature that helps users understand:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cstrong>Whether the messages they sent have been read by the recipient.\u003C\u002Fstrong>\u003C\u002Fli>\u003Cli>\u003Cstrong>Provides senders with confidence that their messages are not being overlooked.\u003C\u002Fstrong>\u003C\u002Fli>\u003Cli>\u003Cstrong>Enhances the real-time communication experience.\u003C\u002Fstrong>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Examples of applications that use Read Receipts include \u003Cstrong>WhatsApp, Messenger, and LINE\u003C\u002Fstrong> which display checkmarks or special icons when messages are read.\u003C\u002Fp>\u003Ch3>Structure of the Read Receipts System in WebSocket Chat\u003C\u002Fh3>\u003Col>\u003Cli>\u003Cstrong>WebSocket Server:\u003C\u002Fstrong> Receives and sends \"read\" status to users in the chat.\u003C\u002Fli>\u003Cli>\u003Cstrong>Database: \u003C\u002Fstrong>Stores the message status (unread\u002Fread).\u003C\u002Fli>\u003Cli>\u003Cstrong>Frontend (Client-Side):\u003C\u002Fstrong> Updates the UI when messages are read.\u003C\u002Fli>\u003C\u002Fol>\u003Ch3>Adding the Read Receipts Feature to the WebSocket Server\u003C\u002Fh3>\u003Ch4>1. Upgrade the WebSocket Server to Support Read Receipts\u003C\u002Fh4>\u003Cp>File: \u003Ccode>\u003Cspan>websocket_server.go\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext\">package main\n\nimport (\n    \"encoding\u002Fjson\"\n    \"fmt\"\n    \"net\u002Fhttp\"\n    \"sync\"\n    \"github.com\u002Fgorilla\u002Fwebsocket\"\n)\n\ntype ReadReceipt struct {\n    MessageID int    `json:\"messageID\"`\n    Reader    string `json:\"reader\"`\n}\n\ntype Message struct {\n    ID      int    `json:\"id\"`\n    Content string `json:\"content\"`\n    Sender  string `json:\"sender\"`\n    ReadBy  []string `json:\"readBy\"`\n}\n\nvar upgrader = websocket.Upgrader{\n    CheckOrigin: func(r *http.Request) bool { return true },\n}\n\nvar (\n    clients   = make(map[*websocket.Conn]bool)\n    messages  = make(map[int]*Message)\n    broadcast = make(chan ReadReceipt)\n    mu        sync.Mutex\n)\n\nfunc handleConnections(w http.ResponseWriter, r *http.Request) {\n    conn, _ := upgrader.Upgrade(w, r, nil)\n    defer conn.Close()\n    clients[conn] = true\n\n    for {\n        var receipt ReadReceipt\n        err := conn.ReadJSON(&receipt)\n        if err != nil {\n            delete(clients, conn)\n            break\n        }\n        broadcast <- receipt\n    }\n}\n\nfunc handleMessages() {\n    for {\n        receipt := <-broadcast\n        mu.Lock()\n        if msg, exists := messages[receipt.MessageID]; exists {\n            msg.ReadBy = append(msg.ReadBy, receipt.Reader)\n        }\n        mu.Unlock()\n        \n        for client := range clients {\n            err := client.WriteJSON(receipt)\n            if err != nil {\n                client.Close()\n                delete(clients, client)\n            }\n        }\n    }\n}\n\nfunc main() {\n    http.HandleFunc(\"\u002Fws\", handleConnections)\n    go handleMessages()\n    fmt.Println(\"WebSocket Server Running on Port 8080\")\n    http.ListenAndServe(\":8080\", nil)\n}\u003C\u002Fcode>\u003C\u002Fpre>\u003Ch4>2. Adding Read Receipts in the Frontend (Client-Side)\u003C\u002Fh4>\u003Cp>File: \u003Ccode>\u003Cspan>client.js\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext\">const socket = new WebSocket(\"ws:\u002F\u002Flocalhost:8080\u002Fws\");\nconst messagesContainer = document.getElementById(\"messages\");\n\nsocket.onmessage = (event) => {\n    const data = JSON.parse(event.data);\n    if (data.messageID) {\n        document.getElementById(`msg-${data.messageID}`).innerText += \" ✔ Read\";\n    }\n};\n\nfunction sendReadReceipt(messageID) {\n    socket.send(JSON.stringify({ messageID, reader: \"JohnDoe\" }));\n}\n\nfunction displayMessage(id, content) {\n    const msgElement = document.createElement(\"p\");\n    msgElement.id = `msg-${id}`;\n    msgElement.innerText = content;\n    msgElement.onclick = () => sendReadReceipt(id);\n    messagesContainer.appendChild(msgElement);\n}\u003C\u002Fcode>\u003C\u002Fpre>\u003Ch3>\u003Cspan>\u003Cstrong>Displaying Read Receipts on the UI\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp data-pm-slice=\"1 1 []\">\u003Cspan>File: \u003C\u002Fspan>\u003Ccode>\u003Cspan>index.html\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext\"><div id=\"messages\"><\u002Fdiv>\u003C\u002Fcode>\u003C\u002Fpre>\u003Ch3>3. Testing the System\u003C\u002Fh3>\u003Col>\u003Cli>\u003Cp>Run the WebSocket Server\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext\">go run websocket_server.go\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fli>\u003Cli>Open Multiple Browser Tabs and Send Messages\u003C\u002Fli>\u003Cli>Click on Messages to Send Read Status\u003C\u002Fli>\u003C\u002Fol>\u003Cp> \u003C\u002Fp>\u003Ch3>Challenge!\u003C\u002Fh3>\u003Cp>Try adding Push Notifications for Read Receipts to notify the sender immediately when their message has been read. This will enhance user engagement and provide instant feedback.\u003C\u002Fp>\u003Chr>\u003Ch3>Next EP\u003C\u002Fh3>\u003Cp>In EP.43, we will add a Pinned Messages feature in the WebSocket Chat! 🚀\u003C\u002Fp>","56_11zon_r53zmj2rwu.webp","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclblg987654321\u002F47tjz8uqxpachz3\u002F56_11zon_r53zmj2rwu.webp","2026-03-04 08:51:00.838Z","",{"keywords":15,"locale":63,"school_blog":73},[16,23,28,33,38,43,48,53,58],{"collectionId":17,"collectionName":18,"created":19,"created_by":13,"id":20,"name":21,"updated":22,"updated_by":13},"sclkey987654321","school_keywords","2026-03-04 08:50:49.558Z","8lxakhujb04wz6u","Chat UX","2026-04-10 16:14:28.724Z",{"collectionId":17,"collectionName":18,"created":24,"created_by":13,"id":25,"name":26,"updated":27,"updated_by":13},"2026-03-04 08:50:59.960Z","up5egj6sjn2i72f","Chat Features","2026-04-10 16:14:30.905Z",{"collectionId":17,"collectionName":18,"created":29,"created_by":13,"id":30,"name":31,"updated":32,"updated_by":13},"2026-03-04 08:51:00.184Z","hnwyjmmf41r934k","Message Read Status","2026-04-10 16:14:31.053Z",{"collectionId":17,"collectionName":18,"created":34,"created_by":13,"id":35,"name":36,"updated":37,"updated_by":13},"2026-03-04 08:48:07.088Z","brfbypclggbbkcx","WebSocket API","2026-04-10 16:13:40.594Z",{"collectionId":17,"collectionName":18,"created":39,"created_by":13,"id":40,"name":41,"updated":42,"updated_by":13},"2026-03-04 08:47:05.949Z","caufix9o52uw4bh","Real-Time Chat","2026-04-10 16:13:23.517Z",{"collectionId":17,"collectionName":18,"created":44,"created_by":13,"id":45,"name":46,"updated":47,"updated_by":13},"2026-03-04 08:20:14.253Z","ah6lvy4x8qe08l5","Golang","2026-04-10 16:07:26.172Z",{"collectionId":17,"collectionName":18,"created":49,"created_by":13,"id":50,"name":51,"updated":52,"updated_by":13},"2026-03-04 08:20:11.547Z","ey3puyme01a9bsw","Go","2026-04-10 16:07:25.893Z",{"collectionId":17,"collectionName":18,"created":54,"created_by":13,"id":55,"name":56,"updated":57,"updated_by":13},"2026-03-04 08:34:00.920Z","ecac9y661or1xka","WebSocket","2026-04-10 16:08:05.227Z",{"collectionId":17,"collectionName":18,"created":59,"created_by":13,"id":60,"name":61,"updated":62,"updated_by":13},"2026-03-04 08:51:00.522Z","yqwzufwzpmf5p93","Read Receipts","2026-04-10 16:14:31.187Z",{"code":64,"collectionId":65,"collectionName":66,"created":67,"flag":68,"id":69,"is_default":70,"label":71,"updated":72},"en","pbc_1989393366","locales","2026-01-22 11:00:02.726Z","twemoji:flag-united-states","qv9c1llfov2d88z",false,"English","2026-04-10 15:42:46.825Z",{"category":74,"collectionId":75,"collectionName":76,"created":13,"expand":77,"id":91,"slug":92,"updated":13,"views":93},"wqxt7ag2gn7xcmk","pbc_2105096300","school_blogs",{"category":78},{"blogIds":79,"collectionId":80,"collectionName":81,"created":82,"created_by":13,"id":74,"image":83,"image_alt":13,"image_path":84,"label":85,"name":86,"priority":87,"publish_at":88,"scheduled_at":13,"status":89,"updated":90,"updated_by":13},[],"sclcatblg987654321","school_category_blogs","2026-03-04 08:33:53.210Z","59ty92ns80w_15oc1implw.png","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclcatblg987654321\u002Fwqxt7ag2gn7xcmk\u002F59ty92ns80w_15oc1implw.png",{"en":86,"th":86},"Golang The Series",1,"2026-03-16 04:39:38.440Z","published","2026-04-25 02:32:15.470Z","q37y3cwja1kppep","read-receipts-websocket-chat",231,"47tjz8uqxpachz3",[20,25,30,35,40,45,50,55,60],"2025-03-24 01:51:13.506Z","Learn how to implement Read Receipts in WebSocket Chat to allow users to know whether their sent messages have been read, using WebSocket and a database.","2026-05-06 08:38:38.178Z",{"th":92,"en":92}]