Using JavaScript to Add Spinner and Block UI in Dynamics 365 and Power Apps - Carl de Souza
javascript - Best way to block out UI elements when editing data - Stack Overflow
GitHub - vijayshegokar/block-ui: The javascript plugin with stylesheet to block ui by showing message or loader or both. There is no dependecny reuired for this plugin. It is completely javascript based plugin.
Avoid code pausing/freezing on javascript error in jQuery blockUI - Stack Overflow