Knockout allows you to implement sophisticated client-side interactivity, but almost all web applications also need to exchange data with the server, or at least to serialize the data for local storage. The most convenient way to exchange or store data is in JSON format - the format that the majority of Ajax applications use today. Loading or Saving Data Knockout doesn’t force you to use any one particular technique to load or save data. You can use whatever mechanism is a convenient fit for yo

Beginners may wish to skip this section - writable computed observables are fairly advanced and are not necessary in most situations Normally, computed observables have a value that is computed from other observables and are therefore read-only. What may seem surprising, then, is that it is possible to make computed observables writable. You just need to supply your own callback function that does something sensible with written values. You can use a writable computed observable exactly like a