calling a web api from JS and displaying signals or info on chart

[MicroTrends]

Very much looking forwards to this web lot... was doing js in 1995 ;-) and yes its come a long way since.
it should be vastly easy indeed with js today to call a webapi and then paint on the chart... news signals data etc
just throwing this out there - fetch would allow this...

let response = await fetch(url);

https://javascript.info/fetch

any limitations or rules as to what we can use in JS etc...?

[QuantKey_Bruce]

I have a use case to do something similar, but with WebSockets. I would ask that this type of usage not be restricted and that we be able to use external libraries (.js files we load from another website) and make RESTful API calls (like the fetch mentioned here) and WebSocket connections. We need this flexibility to be able to deliver high-quality services.

[MicroTrends]

I have a use case to do something similar, but with WebSockets. I would ask that this type of usage not be restricted and that we be able to use external libraries (.js files we load from another website) and make RESTful API calls (like the fetch mentioned here) and WebSocket connections. We need this flexibility to be able to deliver high-quality services.

that would be smashing indeed :-) but would this be a risk to the stability of the platform - in the wrong hands might be an issue
must need a compliance phase i guess to approve

[QuantKey_Bruce]

The JavaScript all runs locally not on their server, so it cannot risk the stability beyond the local browser - no different than how a badly written NinjaScript indicator/strategy/add-on can risk the stability of NinjaTrader Desktop. It's 100% the same situation.

[MicroTrends]

The JavaScript all runs locally not on their server, so it cannot risk the stability beyond the local browser - no different than how a badly written NinjaScript indicator/strategy/add-on can risk the stability of NinjaTrader Desktop. It's 100% the same situation.

yes! great point!!!! this could be really awesome!!!

[backtester831]

QuantKey_Bruce do you know if it's possible to fetch outside data in Tradovate?

[NinjaTrader_BrandonH]

Hello MicroTrends,

Thanks for your post.

We are really excited to be able to offer custom coding on our Web platform soon!

Unfortunately, we do not have these resources and documentation completed quite yet so I cannot say for certain what the limitations might be.

Please let me know if I may be of any further assistance.

[QuantKey_Bruce]

QuantKey_Bruce do you know if it's possible to fetch outside data in Tradovate?

There are some issues with CORS (cross-domain requests from JavaScript), but they should be resolvable, especially if you're in control of both ends of the request.

Other key challenges would include that fetch or XMLHttpRequest is asynchronous - you don't want to hang an indicator calculation while it waits on the web request which may or may not respond reasonably quickly, so you have to develop with that in mind.

[backtester831]

There are some issues with CORS (cross-domain requests from JavaScript), but they should be resolvable, especially if you're in control of both ends of the request.

Other key challenges would include that fetch or XMLHttpRequest is asynchronous - you don't want to hang an indicator calculation while it waits on the web request which may or may not respond reasonably quickly, so you have to develop with that in mind.

That's all fine, but are you saying that Tradovate allows external libraries right now, or already includes a library for making an external https call?

[QuantKey_Bruce]

I have not tested external libraries. The XMLHttpRequest appears as if it would have succeeded but for CORS but I have not yet set up a test API endpoint with CORS enabled to check if that is the only problem.

Tradovate now forbids calling external DLLs, which they previously permitted.