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IBM Domino Designer Basic User Guide and Reference
Basic product usage information and programming language reference information.
Programming Overview and User Interface
This section contains general guidelines and examples that show where to use Java, LotusScript, and the formula language.
Programming Overview
This documentation describes how to attach Java, JavaScript, LotusScript, and formula code to Domino design elements. Here are some overview topics:
Field design formulas
As part of the field design process, you can write the following formulas to run on the user's workstation:
Input validation formulas
An input validation formula checks the data entered in the field against criteria that you specify. This formula executes after the input translation formula.
Examples: Input validation formulas

Examples: Input validation formulas

This input validation formula doesn't let the Cost field exceed 100.
```
@If(Cost<100; @Success; @Failure("Cost must be less than $100"))
```
This formula forces the user to enter a ten-digit number. The formula removes up to two hyphens if they are present. The formula converts the result to a number and returns a failure if an error occurs on the conversion. The formula converts the number back to text and checks its length, returning a failure if the length is incorrect. This last step is necessary because @TextToNumber successfully converts, for example, 123A to 123.
```
N1:= @If(@Contains(Home_Phone; "-"); @Left(Home_Phone; "-")+ @Right(Home_Phone; "-"); Home_Phone);
N2:= @If(@Contains(N1; "-"); @Left(N1; "-")+@Right(N1; "-"); N1); 
N := @TextToNumber(N2);
@If(@IsError(N);@Return(@Failure("Home phone must be zip-xxx-xxxx."));     @Success);
@If(@Length(@Text(N))!= 10;@Failure("Home phone must be zip-xxx-xxxx.");    @Success)
```