dirty method
Implementation
bool dirty(fieldname) {
bool b = false;
if (_frm!.fields!.where((f) => f.fieldName == fieldname).toList().length >
0)
b = _frm!.fields!
.where((f) => f.fieldName == fieldname)
.toList()[0]
.controller!
.text !=
_frm!.fields!
.where((f) => f.fieldName == fieldname)
.toList()[0]
.value;
return b;
}