/usr/share/qt5/doc/qtwebsockets/qtwebsockets-echoserver-echoclient-html.html is in qtwebsockets5-doc-html 5.9.5-0ubuntu1.
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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>echoclient.html Example File | Qt WebSockets 5.9</title>
<link rel="stylesheet" type="text/css" href="style/offline-simple.css" />
<script type="text/javascript">
document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css");
// loading style sheet breaks anchors that were jumped to before
// so force jumping to anchor again
setTimeout(function() {
var anchor = location.hash;
// need to jump to different anchor first (e.g. none)
location.hash = "#";
setTimeout(function() {
location.hash = anchor;
}, 0);
}, 0);
</script>
</head>
<body>
<div class="header" id="qtdocheader">
<div class="main">
<div class="main-rounded">
<div class="navigationbar">
<table><tr>
<td >Qt 5.9</td><td ><a href="qtwebsockets-index.html">Qt WebSockets</a></td><td ><a href="qtwebsockets-echoserver-example.html">Echo Server Example</a></td><td >echoclient.html Example File</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.5 Reference Documentation</td>
</tr></table>
</div>
</div>
<div class="content">
<div class="line">
<div class="content mainContent">
<div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">echoclient.html Example File</h1>
<span class="subtitle">echoserver/echoclient.html</span>
<!-- $$$echoserver/echoclient.html-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<html>
<head>
<title>WebSocket Echo Client</title>
</head>
<body>
<h1>WebSocket Echo Client</h1>
<p>
<button onClick="initWebSocket();">Connect</button>
<button onClick="stopWebSocket();">Disconnect</button>
<button onClick="checkSocket();">State</button>
</p>
<p>
<textarea id="debugTextArea" style="width:400px;height:200px;"></textarea>
</p>
<p>
<input type="text" id="inputText" onkeydown="if(event.keyCode==13)sendMessage();"/>
<button onClick="sendMessage();">Send</button>
</p>
<script type="text/javascript">
var debugTextArea = document.getElementById("debugTextArea");
function debug(message) {
debugTextArea.value += message + "\n";
debugTextArea.scrollTop = debugTextArea.scrollHeight;
}
function sendMessage() {
var msg = document.getElementById("inputText").value;
if ( websocket != null )
{
document.getElementById("inputText").value = "";
websocket.send( msg );
console.log( "string sent :", '"'+msg+'"' );
}
}
var wsUri = "ws://localhost:1234";
var websocket = null;
function initWebSocket() {
try {
if (typeof MozWebSocket == 'function')
WebSocket = MozWebSocket;
if ( websocket && websocket.readyState == 1 )
websocket.close();
websocket = new WebSocket( wsUri );
websocket.onopen = function (evt) {
debug("CONNECTED");
};
websocket.onclose = function (evt) {
debug("DISCONNECTED");
};
websocket.onmessage = function (evt) {
console.log( "Message received :", evt.data );
debug( evt.data );
};
websocket.onerror = function (evt) {
debug('ERROR: ' + evt.data);
};
} catch (exception) {
debug('ERROR: ' + exception);
}
}
function stopWebSocket() {
if (websocket)
websocket.close();
}
function checkSocket() {
if (websocket != null) {
var stateStr;
switch (websocket.readyState) {
case 0: {
stateStr = "CONNECTING";
break;
}
case 1: {
stateStr = "OPEN";
break;
}
case 2: {
stateStr = "CLOSING";
break;
}
case 3: {
stateStr = "CLOSED";
break;
}
default: {
stateStr = "UNKNOW";
break;
}
}
debug("WebSocket state = " + websocket.readyState + " ( " + stateStr + " )");
} else {
debug("WebSocket is null");
}
}
</script>
</body>
</html>
</pre>
</div>
<!-- @@@echoserver/echoclient.html -->
</div>
</div>
</div>
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<acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property
of their respective owners. </p>
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