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Contents
u = up.util
##
# Store implementation backed by window.sessionStorage
# ====================================================
#
# This improves plain sessionStorage access in several ways:
#
# - Falls back to in-memory storage if window.sessionStorage is not available (see below).
# - Allows to store other types of values than just strings.
# - Allows to store structured values.
# - Allows to invalidate existing data by incrementing a version number on the server.
#
# On sessionStorage availability
# ------------------------------
#
# All supported browsers have sessionStorage, but the property is `null`
# in private browsing mode in Safari and the default Android webkit browser.
# See https://makandracards.com/makandra/32865-sessionstorage-per-window-browser-storage
#
# Also Chrome explodes upon access of window.sessionStorage when
# user blocks third-party cookies and site data and this page is embedded
# as an <iframe>. See https://bugs.chromium.org/p/chromium/issues/detail?id=357625
#
class up.store.Session extends up.store.Memory
constructor: (rootKey) ->
@rootKey = rootKey
@loadFromSessionStorage()
clear: =>
super()
@saveToSessionStorage()
set: (key, value) =>
super(key, value)
@saveToSessionStorage()
remove: (key) =>
super(key)
@saveToSessionStorage()
loadFromSessionStorage: =>
try
if raw = sessionStorage?.getItem(@rootKey)
@data = JSON.parse(raw)
catch
# window.sessionStorage not supported (see class comment)
# or JSON syntax error. We start with a blank object instead.
@data ||= {}
saveToSessionStorage: =>
json = JSON.stringify(@data)
try
sessionStorage?.setItem(@rootKey, json)
catch
# window.sessionStorage not supported (see class comment).
# We do nothing and only keep data in-memory.
Version data entries
12 entries across 12 versions & 1 rubygems