Empty value Check not validating on button click

Question

Hello, 
 
 I am trying to do a simple check on a paragraphField or any field(integer, text, decimal field). 
 The validation is not working for empty or null. I tried giving a!isNullOrEmpty(ri!value), Null(ri!value), ri!value=null. The validation message is not shown. 
 If i give any other logic, it works.

Jones Prakash Selvaraj · Accepted Answer

Using a!validationMessage function will help to achieve this. 
 a!formLayout(
 label: "New Application",
 contents: {
 a!paragraphField(
 label: "Paragraph",
 labelPosition: "ABOVE",
 value: ri!text,
 saveInto: { ri!text },
 refreshAfter: "UNFOCUS",
 height: "MEDIUM",
 validations: {}
 )
 },
 validations: a!validationMessage(
 message: "Invalid",
 showWhen: a!isNullOrEmpty(ri!text),
 validateAfter: "SUBMIT"
 ),
 buttons: a!buttonLayout(
 primaryButtons: {
 a!buttonWidget(
 label: "Submit",
 submit: true(),
 style: "PRIMARY"
 )
 }
 )
)

Stefan Helzle · Answer

Why? It is a good UI design style to indicate to the user that a field is required. 
 But, feel free to add a form based validation, or wrap the text field into a section layout and add your validation to it.

Empty value Check not validating on button click

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