validation message

Question

Hi all, 
 I need to validate that in a texfield, the user on type characters, I mean (100k, 80k, ect), numbers with text values. 
 if the user enters 10k,20k like in textfield, I have show some validation message,How could I achieve this, 
 is there a special functions? 
 
 Can anyone help me please on priority?

Jones Prakash Selvaraj · Answer

Hi JS0001 , 
 One suggestion here is that we can directly use the integer field. If there is a different constraint, I have added the code for validation for the text field you expected below. 
 {
 a!textField(
 label: "Text",
 labelPosition: "ABOVE",
 value: ri!text,
 saveInto: ri!text,
 validations: if(
 and(
 a!forEach(
 items: code(ri!text),
 expression: and(fv!item >= 48, fv!item <= 57)
 )
 ),
 "",
 "Enter a valid number"
 )
 )
}