Add a new field to the form.
Please note - this property requires the Editor extension for DataTables.
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Fields in an Editor form can be dynamically added and removed from the form at any point, using this method and the
By default, fields added using this method are automatically appended to the end of the form. As of Editor 1.5.6 you can optionally use the second parameter to determine where in the form's field order the new field should be inserted, or, for older versions, use the
order() method to change the field order after the new field has been added.
Fields are typically set up during instance initialisation using the
fields configuration option (which calls this API method internally) but this option provides the flexibility to modify the fields in the form - for example you might wish to ask for an extra input if a particular option is selected in a