In solid state, both NaCl and NaOH are ionic lattices?

The ionic compounds will dissociate (seperate) into its' constituent ions. Na+ Cl-; and Na+ OH-; and H+ Cl- for HCl. The intermolecular forces between the water molecules and the individual ions in these ionic compounds are much greater (ion-dipole forces) than the ion-ion forces holding these ionic compounds together and the water rips them apart into seperate ions then surrounds them in solution. This goes for HCl too, but HCl is a little more covalent than ionic than the other two you mentioned.