[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"academy-blogs-en-1-1-all-delete-messages-websocket-chat-all--*":3,"academy-blog-translations-y67o0cor0a7acf5":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":93,"keywords":94,"locale":69,"published_at":95,"scheduled_at":13,"school_blog":91,"short_description":96,"slug":97,"status":89,"title":6,"updated":98,"updated_by":13,"views":92},"EP.49 Adding Delete Messages Feature in WebSocket Chat","sclblg987654321","school_blog_translations","\u003Ch3 data-pm-slice=\"1 1 []\">\u003Cspan>\u003Cstrong>Why Have a Delete Messages Feature in WebSocket Chat?\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp>\u003Cspan>The \u003Cstrong>Delete Messages\u003C\u002Fstrong> feature allows users to remove messages they have sent, offering several benefits:\u003C\u002Fspan>\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cstrong>Correct Mistakes:\u003C\u002Fstrong> Users can rectify errors by deleting incorrectly sent messages.\u003C\u002Fli>\u003Cli>\u003Cstrong>Enhanced Flexibility:\u003C\u002Fstrong> Provides greater control over chat content.\u003C\u002Fli>\u003Cli>\u003Cstrong>Increased Privacy:\u003C\u002Fstrong> Allows users to remove messages they do not want others to see.\u003C\u002Fli>\u003C\u002Ful>\u003Ch3>\u003Cspan>\u003Cstrong>Structure of the Message Deletion System in WebSocket Chat\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fh3>\u003Col>\u003Cli>\u003Cstrong>WebSocket Server:\u003C\u002Fstrong> Manages the deletion of messages from the database and notifies all clients.\u003C\u002Fli>\u003Cli>\u003Cstrong>Database (PostgreSQL \u002F MongoDB):\u003C\u002Fstrong> Stores the status of deleted messages.\u003C\u002Fli>\u003Cli>\u003Cstrong>Frontend (Client-Side):\u003C\u002Fstrong> Displays the delete message button in the UI and updates results in real-time.\u003C\u002Fli>\u003C\u002Fol>\u003Ch3>\u003Cspan>\u003Cstrong>Adding the Delete Messages Feature to the WebSocket Server\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fh3>\u003Ch4>\u003Cspan>\u003Cstrong>1. Updating the Database to Support Message Deletion\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fh4>\u003Cp>\u003Cspan>File: \u003C\u002Fspan>\u003Ccode>\u003Cspan>schema.sql\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext\">ALTER TABLE chat_messages ADD COLUMN deleted BOOLEAN DEFAULT FALSE;\u003C\u002Fcode>\u003C\u002Fpre>\u003Ch4>\u003Cspan>\u003Cstrong>2. Adding Code to Delete Messages in the WebSocket Server\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fh4>\u003Cp>\u003Cspan>File: \u003C\u002Fspan>\u003Ccode>\u003Cspan>websocket_server.go\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext\">package main\n\nimport (\n    \"database\u002Fsql\"\n    \"encoding\u002Fjson\"\n    \"fmt\"\n    \"net\u002Fhttp\"\n    \"sync\"\n\n    \"github.com\u002Fgorilla\u002Fwebsocket\"\n    _ \"github.com\u002Flib\u002Fpq\"\n)\n\ntype DeleteRequest struct {\n    MessageID int    `json:\"messageID\"`\n    Sender    string `json:\"sender\"`\n}\n\ntype DeleteResponse struct {\n    MessageID int  `json:\"messageID\"`\n    Deleted   bool `json:\"deleted\"`\n}\n\nvar (\n    clients   = make(map[*websocket.Conn]bool)\n    broadcast = make(chan DeleteResponse)\n    mu        sync.Mutex\n    db        *sql.DB\n)\n\nfunc handleDeleteMessage(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 request DeleteRequest\n        err := conn.ReadJSON(&request)\n        if err != nil {\n            delete(clients, conn)\n            break\n        }\n        \n        _, err = db.Exec(\"UPDATE chat_messages SET deleted = TRUE WHERE id = $1 AND sender = $2\", request.MessageID, request.Sender)\n        if err == nil {\n            broadcast <- DeleteResponse{MessageID: request.MessageID, Deleted: true}\n        }\n    }\n}\n\nfunc notifyClients() {\n    for {\n        msg := <-broadcast\n        for client := range clients {\n            err := client.WriteJSON(msg)\n            if err != nil {\n                client.Close()\n                delete(clients, client)\n            }\n        }\n    }\n}\n\nfunc main() {\n    http.HandleFunc(\"\u002Fws\", handleDeleteMessage)\n    go notifyClients()\n    fmt.Println(\"WebSocket Server Running on Port 8080\")\n    http.ListenAndServe(\":8080\", nil)\n}\u003C\u002Fcode>\u003C\u002Fpre>\u003Ch3>\u003Cspan>\u003Cstrong>3. Adding a Delete Message Button in the Frontend (Client-Side)\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp>\u003Cspan>File: \u003C\u002Fspan>\u003Ccode>\u003Cspan>client.js\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext\">const socket = new WebSocket(\"ws:\u002F\u002Flocalhost:8080\u002Fws\");\nconst chatContainer = document.getElementById(\"chat-container\");\n\nsocket.onmessage = (event) => {\n    const data = JSON.parse(event.data);\n    if (data.deleted) {\n        document.getElementById(`msg-${data.messageID}`).innerText = \"(Message Deleted)\";\n    }\n};\n\nfunction sendDeleteRequest(messageID) {\n    socket.send(JSON.stringify({ messageID, sender: \"JohnDoe\" }));\n}\n\nfunction displayMessage(id, sender, content) {\n    const msgElement = document.createElement(\"p\");\n    msgElement.id = `msg-${id}`;\n    msgElement.innerText = `${sender}: ${content}`;\n    \n    const deleteButton = document.createElement(\"button\");\n    deleteButton.innerText = \"Delete\";\n    deleteButton.onclick = () => sendDeleteRequest(id);\n    \n    msgElement.appendChild(deleteButton);\n    chatContainer.appendChild(msgElement);\n}\u003C\u002Fcode>\u003C\u002Fpre>\u003Ch3>\u003Cspan>\u003Cstrong>Displaying the Delete Message Button on the UI\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp>\u003Cspan>File: \u003C\u002Fspan>\u003Ccode>\u003Cspan>index.html\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext\"><div id=\"chat-container\"><\u002Fdiv>\u003C\u002Fcode>\u003C\u002Fpre>\u003Ch3>\u003Cspan>\u003Cstrong>4. Testing the System\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fh3>\u003Col data-spread=\"false\">\u003Cli>\u003Cspan>\u003Cstrong>Running the WebSocket Server\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fli>\u003C\u002Fol>\u003Cpre>\u003Ccode class=\"language-plaintext\">go run websocket_server.go\u003C\u002Fcode>\u003C\u002Fpre>\u003Col data-spread=\"false\" start=\"2\">\u003Cli>\u003Cspan>\u003Cstrong>Open the Web Page and Try Typing a Message\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fli>\u003Cli>\u003Cspan>\u003Cstrong>Click the Delete Message Button and Observe the Results on the UI\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fli>\u003C\u002Fol>\u003Ch3>\u003Cspan>\u003Cstrong>Challenge!\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp>\u003Cspan>Try adding a \u003Cstrong>feature that notifies users\u003C\u002Fstrong> when a message is deleted, or display the message\u003Cstrong> “This message was deleted” instead of removing it from the UI.\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fp>\u003Ch3>\u003Cspan>\u003Cstrong>Next EP\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp>\u003Cspan>In \u003Cstrong>EP.50\u003C\u002Fstrong>, we will add a \u003Cstrong>Feature to Edit Sent Messages in the WebSocket Chat! 🚀\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fp>","70_11zon_c85x7ww2au.webp","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclblg987654321\u002Fncsdaobrsur4j47\u002F70_11zon_c85x7ww2au.webp","2026-03-04 08:50:51.364Z","",{"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 08:50:49.965Z","ga8fw2l8y3mxjxg","Persistent Chat","2026-04-10 16:14:28.869Z",{"collectionId":17,"collectionName":18,"created":29,"created_by":13,"id":30,"name":31,"updated":32,"updated_by":13},"2026-03-04 08:50:50.858Z","mt8vm4xyendwvlb","Remove Messages","2026-04-10 16:14:29.256Z",{"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 08:48:51.522Z","2jlqt2u73fp1rx3","Delete Messages","2026-04-10 16:13:55.108Z",{"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,"expand":77,"id":91,"views":92},"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","y67o0cor0a7acf5",221,"ncsdaobrsur4j47",[20,25,30,35,40,45,50,55,60],"2025-03-24 01:52:37.089Z","Learn how to implement the Delete Messages feature in WebSocket Chat, allowing users to remove previously sent messages and update results in real-time for all users in the chat room.","delete-messages-websocket-chat","2026-04-22 07:10:38.339Z",{"en":97}]