Form field: exists¶
Looks up the current form structure whether a specified field exists.
Negate the condition
Negates the condition. Makes TRUE to FALSE and vice versa.
The input name of the form field. This is mostly found in the "name" attribute of an <input> form element. For submit buttons within content forms: Use "submit" for the labeled "Save" button, and "preview" for the labeled "Preview" button. This property supports tokens.