How can i delete "," from form

I have my form http://www.jotformpro.com//?formID=32667421146352

i use hidden textbox to use canditionl values

in the field CHARSET i use Checkbox and use hidden field CHARSETVALUE for use canditionl values

How can i delete "," if i check some settings

I need to make the settings were made for each other without gaps

It is not possible to remove the comma between the selected options since they are text entries and cannot perform calculations. However, as a workaround this can be achieved by having multiple checkbox fields i.e., lowercase one checkbox field, uppercase another checkbox field, and so on rather having all charset options under the same checkbox field. 

The CharsetValue can be set by using calculation values of all checkbox fields.

The result can be shown as below.

Hope this information helps. Pleas e let us know if you need further assistance.

Thank you!