qmlchatclient.qml Example File

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import QtQuick 2.2 import QtQuick.Dialogs 1.2 import QtQuick.Controls 2.0 import QtQuick.Window 2.0 import QtQuick.Layouts 1.1 import Qt.WebSockets 1.0 import "qwebchannel.js" as WebChannel ApplicationWindow { id: root property var channel property string loginName: loginUi.userName.text title: "Chat client" width: 640 height: 480 visible: true WebSocket { id: socket // the following three properties/functions are required to align the QML WebSocket API // with the HTML5 WebSocket API. property var send: function(arg) { sendTextMessage(arg); } onTextMessageReceived: { onmessage({data: message}); } property var onmessage active: true url: "ws://localhost:12345" onStatusChanged: { switch (socket.status) { case WebSocket.Error: errorDialog.text = "Error: " + socket.errorString; errorDialog.visible = true; break; case WebSocket.Closed: errorDialog.text = "Error: Socket at " + url + " closed."; errorDialog.visible = true; break; case WebSocket.Open: //open the webchannel with the socket as transport new WebChannel.QWebChannel(socket, function(ch) { root.channel = ch; //connect to the changed signal of the userList property ch.objects.chatserver.userListChanged.connect(function(args) { mainUi.userlist.text = ''; ch.objects.chatserver.userList.forEach(function(user) { mainUi.userlist.text += user + '\n'; }); }); //connect to the newMessage signal ch.objects.chatserver.newMessage.connect(function(time, user, message) { var line = "[" + time + "] " + user + ": " + message + '\n'; mainUi.chat.text = mainUi.chat.text + line; }); //connect to the keep alive signal ch.objects.chatserver.keepAlive.connect(function(args) { if (loginName !== '') //and call the keep alive response method as an answer ch.objects.chatserver.keepAliveResponse(loginName); }); }); loginWindow.show(); break; } } } MainForm { id: mainUi anchors.fill: parent Connections { target: mainUi.message onEditingFinished: { if (mainUi.message.text.length) { //call the sendMessage method to send the message root.channel.objects.chatserver.sendMessage(loginName, mainUi.message.text); } mainUi.message.text = ''; } } } Window { id: loginWindow title: "Login" modality: Qt.ApplicationModal width: 300 height: 200 LoginForm { id: loginUi anchors.fill: parent nameInUseError.visible: false Connections { target: loginUi.loginButton onClicked: { //call the login method root.channel.objects.chatserver.login(loginName, function(arg) { //check the return value for success if (arg === true) { loginUi.nameInUseError.visible = false; loginWindow.close(); } else { loginUi.nameInUseError.visible = true; } }); } } } } MessageDialog { id: errorDialog icon: StandardIcon.Critical standardButtons: StandardButton.Close title: "Chat client" onAccepted: { Qt.quit(); } onRejected: { Qt.quit(); } } }

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