Hi ycage0123@yahoo.co.jp,
Could you share your FreeMASTER project (including HML/JS resources) so I can better understand:
- Whether you are using ActiveX or JSON-RPC API
- How the API methods are called
- Whether the issue lies with FreeMASTER API or the usage of D3.js library
Please note - the "easiest way" depends on the frameworks / libraries you are most experienced with. We do not promote any specific front-end technology, so the choice if yours, as application developer, to make.
Kind regards,
Iulian