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<td >Qt 5.12</td><td ><a href="qtwebchannel-index.html">Qt WebChannel</a></td><td ><a href="qtwebchannel-examples.html">Qt WebChannel Examples</a></td><td >Qt WebChannel ChatClient QML Example</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtwebchannel-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#running-the-example">Running the Example</a></li>
<li class="level1"><a href="#implementing-a-web-channel-client">Implementing a Web Channel Client</a></li>
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<h1 class="title">Qt WebChannel ChatClient QML Example</h1>
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<p>A QML client that communicates over a WebSocket with a <a href="qwebchannel.html">QWebChannel</a> server.</p>
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<p class="centerAlign"><img src="images/chatclient-qml.png" alt="" /></p><p><i>ChatClient QML</i> provides a simple <a href="qwebchannel.html">QWebChannel</a> client implemented using JavaScript and QML.</p>
<a name="running-the-example"></a>
<h2 id="running-the-example">Running the Example</h2>
<p>To run the example, enter the following command in the client source directory:</p>
<p><code>path/to/qmlscene qmlchatclient.qml</code></p>
<a name="implementing-a-web-channel-client"></a>
<h2 id="implementing-a-web-channel-client">Implementing a Web Channel Client</h2>
<p>The client initializes a WebSocket connection to the chat server and receives an object containing all the necessary signals, slots, and properties for implementing a chat client.</p>
<p>After login, the client can invoke the method <code>sendMessage</code> and receive the signal <code>newMessage</code> to send and receive messages. Furthermore, a <code>userList</code> property provides the names of all other connected clients. It is automatically updated when its contents change. Also, the client responds to the server's keep alive signal which is needed to detect disconnected clients and remove them from the <code>userList</code> property.</p>
<p>The example shows how basic elements can be used with the client JavaScript implementation of <a href="qwebchannel.html">QWebChannel</a>, like connecting to signals (<code>newMessage</code>), calling slots (<code>sendMessage</code>), and handling property changes (<code>userList</code>).</p>
<p>The client is able to work with the <a href="qtwebchannel-chatserver-cpp-example.html">Qt WebChannel ChatServer Example</a>.</p>
<p>Files:</p>
<ul>
<li><a href="qtwebchannel-chatclient-qml-loginform-ui-qml.html">chatclient-qml/LoginForm.ui.qml</a></li>
<li><a href="qtwebchannel-chatclient-qml-mainform-ui-qml.html">chatclient-qml/MainForm.ui.qml</a></li>
<li><a href="qtwebchannel-chatclient-qml-chatclient-qml-pro.html">chatclient-qml/chatclient-qml.pro</a></li>
<li><a href="qtwebchannel-chatclient-qml-qmlchatclient-qml.html">chatclient-qml/qmlchatclient.qml</a></li>
</ul>
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<p><b>See also </b><a href="qtwebchannel-chatserver-cpp-example.html">Qt WebChannel ChatServer Example</a> and <a href="qtwebchannel-chatclient-html-example.html">Qt WebChannel ChatClient HTML Example</a>.</p>
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