How to setup a websocket with Javascript connected to Node-red
Question
SO i have set myself with a project to turn on a light on RPi with node-red and a html document. So i have got all the node-red set up and it works along with the LED on my RPi. I installed apache2 and have been trying to start a websocket thing, but i have had no success.
<!DOCTYPE HTML>
<html>
<head>
<script type = "text/javascript">
function WebSocketTest() {
if ("WebSocket" in window) {
alert("WebSocket is supported by your Browser!");
// Let us open a web socket
var ws = new WebSocket("ws://var/www/html/index.html");
ws.onopen = function() {
// Web Socket is connected, send data using send()
ws.send("Message to send");
alert("Message is sent...");
};
ws.onmessage = function (evt) {
var received_msg = evt.data;
alert("Message is received...");
};
ws.onclose = function() {
// websocket is closed.
alert("Connection is closed...");
};
} else {
// The browser doesn't support WebSocket
alert("WebSocket NOT supported by your Browser!");
}
}
</script>
</head>
<body>
<div id = "sse">
<a href = "javascript:WebSocketTest()" onclick="WebSocketTest()">Run WebSocket</a>
</div>
</body>
</html>
this is my code, and i have been trying to get it to work for ages, so i have come to the conclusion that this is not going to work
1 answers
solution1
0 2020-12-21 14:24:01
You can't use a file path for the websocket address.
It needs to be something like:
// Let us open a web socket
var ws = new WebSocket("ws://node-red.local:1880/foo");
Where Node-RED is running on node-red.local (you can probably swap this for the IP address) and you have configured a websocket-in node to bind to /foo
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