Make a field required if selection is made from dropdown list

[Former Community Member]

Hello,

Does anyone know of a way to make a field change from optional to required based on a selection made from a dropdown list?

For example I have a dropdown list that has option 1-3, and I have a hidden field that is optional. When option 3 is chosen the hidden field is visible, but I would also like it to be required before a submit of the form is possible.

Thanks in advance for any insight!

[Former Community Member · Accepted solution]

You could put this code into your exit event of you drop-down list.. Just change TextField1 to your field's name and make sure the Language is set to JavaScript:

if (this.selectedIndex == 2){

TextField1.presence = 'visible';

TextField1.mandatory = "error";

TextField1.mandatoryMessage = "This field is mandatory!";

}

else {

TextField1.presence = 'hidden';

TextField1.mandatory = 'disabled';

}

[Former Community Member]

Works like a charm! Thanks for the feedback!