var default_preferences = {"pbkdf2_level": 1000, "account_url": "https://gpass-demo.soutade.fr/demo", "always_disabled":false }; function save() { var account_url = document.getElementById('account_url').value; var pbkdf2_level = document.getElementById('pbkdf2_level').value; var always_disabled = document.getElementById('always_disabled').checked; chrome.storage.local.set({ 'account_url': account_url, 'pbkdf2_level': pbkdf2_level, 'always_disabled': always_disabled, }, function() { alert('Saved'); }); } function restoreOption(preferences, pref) { var res; if (!preferences.hasOwnProperty(pref)) res = default_preferences[pref]; else res = preferences[pref]; var element = document.getElementById(pref); if (element.type == 'checkbox') element.checked = res; else element.value = res; } chrome.storage.local.get(null, function(prefs) { restoreOption(prefs, 'account_url'); restoreOption(prefs, 'pbkdf2_level'); restoreOption(prefs, 'always_disabled'); }); document.getElementById('save').addEventListener("click", save);