I have a requirement where in i need to call up HTML portlet Automatically if a attribute is select a value and save. is it possible via GEL or Processes? XML Path etc
Not sure I understand your use-case, or your proposed solutions (GEL, Processes are batch functions not user-interface ones).
We can put "any" dynamic value on a object-edit page based upon an object's values using this technique TIP : How To Put Any Dynamically Generated Value On A Clarity Object - that dynamic value could easily be a hyperlink that could launch a portlet/HTML page?
I was about to ask In case if we can open any URL or say redirect to URL
As I said, you can put the (any) URL/Hyperlink on screen (on an object-edit page only) but you are still reliant on the user clicking that hyperlink to launch whatever it is, so its not "automatic".