Making a text box required ONLY when a certain checkbox is selected in adobe forms

Hi ​@ChristiLynn ,

The best approach is to employ a Mouse Up action script, executed from the desired checkbox.

Something like this:

(event.target.value !=="Off") ? this.getField("Text4").required = true : this.getField("Text4").required = false

Required in this context means that the textbox will be outlined with a red border indicating the user to fill in that textbox.

Other methods can be combined too, like employing popups, dialogs or alerts.

If you’d prefer to hide the field or make it visible, you may use the same line of code above with a small variation like this:

(event.target.value !=="Off") ? this.getField("Text4").display = display.visible : this.getField("Text4").display = display.hidden;