public class | source

PersistentStorage

You can directly use an instance of this class. PersistStorage

* → PersistentStorage

Class for the persistent storage of data on a device using ASyncStorage.

Constructor Summary

Public Constructor
public	constructor(props: Object) Creates an instance of AuthLoadingView

Public Methods
public	checkValid(val: string): Boolean Checks if the parameter passed in is valid.
public	async getAllStoredKeys(onComplete: Function) Get all the stored keys.
public	async removeAllData(keepKeys: List, onSuccess: Function, onError: Function) Removes all stored keys in the AsyncStorage.
public	async removeData(key: string, onError: Function) Removes an item from the persistent storage.
public	async retrieveData(key: string, onSuccess: Function, onError: Function) Retrieves data from AsyncStorage and calls the success callback with the value.
public	async storeData(key: string, value: string/Number, onError: *) Stores key, data using AsyncStorage to the device.

Creates an instance of AuthLoadingView

Name	Type	Attribute	Description
props	Object		Component properties

Checks if the parameter passed in is valid.

Name	Type	Attribute	Description
val	string		A value to check

true: Value is valid; false: Value is invalid

Get all the stored keys.

Name	Type	Attribute	Description
onComplete	Function		A callback function to call with an array of keys and an error if it failed. onComplete(error, keys)

Removes all stored keys in the AsyncStorage.

Name	Type	Attribute	Description
keepKeys	List		A list of keys as strings to keep in local storage.
onSuccess	Function		A callback function to call if all keys were successfully removed.
onError	Function		A callback function to call if one or more keys threw an error when being removed.

Removes an item from the persistent storage.

Name	Type	Attribute	Description
key	string		The key for an item that should be removed
onError	Function		A failure callback if an error occurs

Retrieves data from AsyncStorage and calls the success callback with the value.

Name	Type	Attribute	Description
key	string		A key to fetch the data for
onSuccess	Function		A success callback to process the data
onError	Function		A failure callback to call if an error occurs

Stores key, data using AsyncStorage to the device.

Name	Type	Attribute	Description
key	string		A key to store data with
value	string/Number		A value to store (can be string or number)
onError	*		An error callback to call if there's an error while storing data