Connecting to Websockets using JavaScript

Jilani

Hi Kailash,
We are trying to connect using JavaScript, but the we are not getting the desired response.
But when I try using Dark Websocket plugin , I am getting the binary response.
Please see the below code:

var ws = new WebSocket("wss://websocket.kite.trade/?api_key=xyz&user_id=abc&public_token=abc");
var message = {"a":"subscribe","v":[408065,884737]};
this.send = function (message, callback) {
this.waitForConnection(function () {
ws.send(message);
if (typeof callback !== 'undefined') {
callback();
}
}, 1000);
};


ws.onmessage = function (evt) {
var messageObj = evt;
console.log(messageObj);

};

Kailash

You should encode your data structure to JSON before you send it. So:

ws.send(JSON.stringify(message));

Jilani

@Kailash Thanks.
I have encoded to JSON, now I get the following response
Blob {size: 1, type: ""}
But I am not getting the binary content.
I assume the size is 1 as the Market is closed.
Let me know if I am missing something.

Here's the sample code:

function wssend(){

var ws = new WebSocket("wss://websocket.kite.trade/?api_key=abc&user_id=xyz&public_token=123");
ws.binaryType="blob";
var message = {"a":"subscribe","v":[408065,884737]};
this.send = function (message, callback) {
this.waitForConnection(function () {
ws.send(JSON.stringify(message));
if (typeof callback !== 'undefined') {
callback();
}
}, 1000);
};
ws.onmessage = function (evt)
{
var messageObj = evt;
if(evt.data instanceof Blob)
{

evt.data = new Blob();
console.log(evt.data);
} else {
processText(evt.data);
console.log(messageObj);
}
}
}

Regards,
Jilani.

Kailash

When there are no ticks, a 1-byte (null) heart beat is sent. That's what you're seeing. You can try subscribing to MCX instruments.

Jilani

@Kailash is the JavaScript Websocket Library ready?
I am able to get the response only the size, but not the actual binary data.
Any help will be highly appreciated!!

Kailash

@Jilani Need a little more time ;( We have client libraries in multiple languages in the pipeline. Could you give the Python WebSocket library a shot for the time being?

Jilani

@Kailash any update on the JavaScript or Android Libraries?