Are there any difference? or is there any online javascript/formcalc training/tutorial specifically for livecycle coding?

Good day to allI'm trying to make text fields mandatory while having a rawValue. I know that mandatory works only if the field is empty. I tried the code that will make the field empty when clicked/entered but I want the error message to pop up after I exit the field or after I save the form. Also, the fields have a validation (e.g., date, time and phone number). I also need the field be mandatory IF the previous field is filled in. One more, is there any way to make signature field mandatory? I...

Can someone help me? I'm still trying to learn javascript (again)In the image above. Is it possible to prepopulate the Risk Level field based on the value of Likelihood and Severity?The risk level column need to produce a score from the multiplying the likelihood by the severity selections. Also, the risk level field bg color needs to change depending on the calculated value (low - green, medium - yellow, high - red)This is the list for each the dropdown listLikelihoodVery Low (1)Low (2)Medium (...