Socket.IO client event handler not called? - socket.io

Question

I'm an iOS developer who recently started using Socket.IO. During the life cycle of my iOS application, my server will be receiving messages from my app as the client, but for one particular case, the server will also need to receive a message from a web browser as the client. I'm testing a very basic browser UI, which includes a text field and a button and on the tap of that button, a numeric code (which was entered in the text field) needs to be sent to the server. This is what that looks like:
<form>
Code:<br>
<input type="text" id="code" name="code"><br>
<input type="submit" id="validatebutton" value="Validate">
<script src="/socket.io-client/dist/socket.io.js"></script>
<script>
document.getElementById("validatebutton").onclick = function() {
var socket = io('http://localhost:3000');
socket.on('connect', function(clientSocket) {
clientSocket.emit('validateCode', document.getElementById("code"));
});
};
</script>
</form>
The connection works fine. When I run this code, the client successfully connects to the listening socket server. The only problem is that the event handler is not executed. I may be very off here, but what I went for is a client event handler, which is included in the Swift SDK:
self.socket.on(clientEvent: .connect, callback: { (data:[Any], ack:SocketAckEmitter) in
// Do something here
})
self.socket.connect()
I'm just assuming that the Javascript client has a client event handler (named 'connect') as well, which is received by the client at the moment of connecting to a server. Like I said, I may be way off here. I'm just following the Socket.IO documentation posted on their website, which tells me to do it this way. If someone can tell me what I'm missing, or what I'm doing wrong, it would be much appreciated. Sorry for all the noobishness, but I really don't know where else to turn, since the official documentation is very vague and the other question on Stack are a little too advanced for me.

Answer 1

I wouldn't put the emit function inside the connect. Try emitting like below in your client
<script>
var socket = io('http://localhost:3000');
document.getElementById("validatebutton").onclick = function() {
socket.emit('validateCode', document.getElementById("code"));
};
</script>
Your click event was probably getting executed, but the emit was not due to it being wrapped in the connect function (which only gets executed when the socket connects to the server)
Also I would put the JavaScript in its own file, but for now, at least after the form (not inside it) will work.