I'm in the middle of creating a mashup and one of my requirements is to display alert pop ups if certain scenarios are met. What I mean by this exactly is as follows:
Can someone please tell me how I can read from a variable or the contents of a field using the API?
Have a look at the Field API https://help.qlik.com/en-US/sense-developer/3.0/Subsystems/APIs/Content/MashupAPI/qlik-field-interface.htm
The links above give good descriptions and examples.