Here is from the SAP HANA Developers Guide (Section 8.8 Server-Side JavaScript Tracing):
The SAP HANA XS server-side JavaScript API provides tracing functions that enable your application to write predefined messages in the form of application-specific trace output in the xsengine trace files (xsengine*.trc) according to the trace level you specify, for example, “info”(information) or “error”.
If you use the server-side JavaScript API to enable your application to write trace output, you can choose from the
following trace levels:
● debug
● info
● warning
● fatal
For example, to enable debug-level tracing for your JavaScript application:
$.trace.debug("request path: " + $.request.path);
Note
You can view the xsengine*.trace files in the Diagnosis Files tab page in the Administration perspective of the SAP HANA studio.
It sounds as though the WebIDE with its greatly reduced number of trace files might not show you these. Have you tried using the HANA Studio as described in the online help?