Jam.py documentation



domain: client

language: javascript

class Field class


You can use field_mask attribute to specify the name of the field that appears to

The mask allows a user to more easily enter fixed width input where you would like them to enter the data in a certain format (dates,phone numbers, etc).

A mask is defined by a format made up of mask literals and mask definitions. Any character not in the definitions list below is considered a mask literal. Mask literals will be automatically entered for the user as they type and will not be able to be removed by the user.The following mask definitions are predefined:

  • a - Represents an alpha character (A-Z,a-z)

  • 9 - Represents a numeric character (0-9)

  • * - Represents an alphanumeric character (A-Z,a-z,0-9)


function on_edit_form_created(item) {
    item.phone.field_mask = '999-99-99';