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<!DOCTYPE html>
<html>
<!--
This is a JavaScript client that can interact with server.py. Run the server
as follows:
$ python server.py 127.0.0.1 8000
Then load this page in a browser. This JavaScript client has features similar to
client.py except limited by the DOM API. For example, the DOM API does not have
a ping() method for WebSockets.
-->
<head>
<title>WebSocket Test</title>
</head>
<body>
<h1>WebSocket Test</h1>
<div id='output' style='border: 1px solid grey; padding: 1em;'>
<h2>Output:</h2>
</div>
<div style='border: 1px solid grey; margin-top: 1em; padding: 1em;'>
<h2>Commands:</h2>
<pre>
send <MESSAGE> -> send message
close [<REASON>] -> politely close connection with optional reason
</pre>
<p>
<input id="command" type='text' placeholder='command'
style="padding: 0.2em" disabled>
</p>
</div>
<script type='text/javascript'>
var ws;
var url = 'ws://localhost:8000/server';
addEventListener('load', function init() {
connect();
});
function connect() {
print('Connecting: ' + url);
ws = new WebSocket(url);
ws.onmessage = function(event) {
print('Received: ' + event.data);
}
ws.onopen = function(event) {
var input = document.getElementById("command");
input.addEventListener("keyup", handleKey);
input.disabled = false;
}
ws.onclose = function(event) {
document.getElementById("command").disabled = true;
print('Error: server closed the connection')
}
ws.onerror = function (event) {
print('Connection error: (see console)');
console.log(event);
};
}
function handleKey(event) {
if (event.key == "Enter") {
var input = document.getElementById("command");
var cmd = input.value;
input.value = '';
doCommand(cmd)
}
}
function doCommand(cmd) {
if (cmd.startsWith('send ')) {
ws.send(cmd.substring(5));
} else if (cmd.startsWith('close')) {
ws.close(1000, cmd.substring(6))
} else {
print('Error: invalid command');
}
}
function print(s) {
var pre = document.createElement('pre');
pre.appendChild(document.createTextNode(s));
document.getElementById('output').appendChild(pre);
}
</script>
</body>
</html>
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