Validate a field before submitting

Hello

I'm trying to figure out how to validate an input parameter before the user is allowed to submit.  What I want to do is to compare the number of entries in the table to a variable number.  If need to post this:

User input in table = 2 points

Number of check = 3 points

Given that the numbers do not match, an error should appear. Similar to the 'allow values' (attached picture).  I would like a pop up saying "Please add or subtract a value" or soemthing along these lines.

Is this possible?

Thank you

I forgot something:

To have an error message to return a string instead of a Boolean value with something like this:

if (array.length != arrayLength ) {
     return "Invalid array length, length must be " + arrayLength ;
 }
 return "";

Christophe.

Tags: VMware

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