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storage.service.md

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Title Added Status Last reviewed
Storage service
v2.0.0
Active
2018-11-14

Storage service

Stores items in the form of key-value pairs.

Class members

Methods

  • clear()
    Removes all currently stored items.
  • getItem(key: string): string|null
    Gets an item.
    • key: string - Key to identify the item
    • Returns string|null - The item (if any) retrieved by the key
  • hasItem(key: string): boolean
    Is any item currently stored under key?
    • key: string - Key identifying item to check
    • Returns boolean - True if key retrieves an item, false otherwise
  • removeItem(key: string)
    Removes a single item.
    • key: string - Key to identify the item
  • setItem(key: string, data: string)
    Stores an item
    • key: string - Key to identify the item
    • data: string - Data to store

Details

The service will check to see if web storage is available on the browser. If it is available then the service will use it to store the key-value items persistently. Web storage can be used in a similar way to cookies but with a much higher size limit (several MB for web storage compared to a few KB for cookies). However, cookies are more widely supported by browsers and can be set to expire after a certain date.

If local storage is not available then non-persistent memory storage within the app is used instead.

Storage specific to an ADF app

If you are using multiple ADF apps, you might want to set the following configuration so that the apps have specific storages and are independent of others when setting and getting data from the local storage.

In order to achieve this, you will only need to set your app identifier under the storagePrefix property of the app in your app.config.json file.

"application": {
    "storagePrefix": "ADF_Identifier",
    "name": "Your app name",
    "copyright": "Your copyright message"
}

Important note This identifier must be unique to the app to guarantee that it has its own storage.

SSO storagePrefix related scenario

The storagePrefix can allow you to login with multiple user in the same browser only if: - Or You don't use the implicit flow - Or You use implicit flow you use different AIMS instances for any app

See also