Start off checking if you have it at all
if(typeof localStorage == 'undefined') {
// Fallback to some other mechanism
} else {
if(typeof localStorage.getItem == 'undefined') {
// Fallback to some other mechanism
}
if(typeof localStorage.setItem == 'undefined') {
// Fallback to some other mechanism
}
if(typeof localStorage.removeItem == 'undefined') {
// Fallback to some other mechanism
}
}
Fallback mechanisms can be varied
If you only need to save small quantities of Data cookies are fine
JSON to a server allows pretty unlimited storage - but you need a server of course
There are several other fallbacks available - Nokia S60 (worst example I can think of) is really had for all fallbacks for example but can still handle a DB layer.
BB5 is a little better and has DB support (the browser is a nightmare though)
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