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40 lines
1.2 KiB
Markdown
40 lines
1.2 KiB
Markdown
# Storage service
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Stores items in the form of key-value pairs.
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## Methods
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`getItem(key: string): string | null` <br/>
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Gets an item identified by `key`.
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`setItem(key: string, data: string)` <br/>
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Stores an item under `key`.
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`clear()` <br/>
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Removes all currently stored items.
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`removeItem(key: string)` <br/>
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Removes the item identified by `key`.
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`hasItem(key: string): boolean` <br/>
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Is any item currently stored under `key`?
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## Details
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The service will check to see if
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[web storage](https://developer.mozilla.org/en-US/docs/Web/API/Storage/LocalStorage)
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is available on the browser. If it is available then the service will use it to
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store the key-value items persistently. Web storage can be used in a similar way to
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[cookies](cookie.service.md) but with a much higher size limit (several MB for
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web storage compared to a few KB for cookies). However, cookies are
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more widely supported by browsers and can be set to expire after a certain date.
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If local storage is not available then non-persistent memory storage within the app is
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used instead.
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<!-- Don't edit the See also section. Edit seeAlsoGraph.json and run config/generateSeeAlso.js -->
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<!-- seealso start -->
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## See also
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- [Cookie service](cookie.service.md)
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<!-- seealso end --> |