What You Should Not Do in Begin- and End-Field Functions

There are a few cautions about writing begin-field functions:

• nIf you change the options for the current field, these options are not used until the next time the user goes to that field.
  
  
• nIf you write to the form window, be sure to restore the location of the virtual cursor in the form window. For more information about writing to windows and saving and restoring the cursor location, see Chapter 24, "Writing to Windows."

There is one caution about writing end-field functions. If you use the field option FORCECONVERT, to force Vermont Views to update the underlying data variable for a field immediately, you should be aware that this conversion does not take place until after your end-field function has returned. If you need to get the converted value of the current field in your end-field function, use the function fld_get().