Storage class - dart:html library

The type used by the Window.localStorage and Window.sessionStorage properties. Storage is implemented as a Map<String, String>.

To store and get values, use Dart's built-in map syntax:

window.localStorage['key1'] = 'val1';
window.localStorage['key2'] = 'val2';
window.localStorage['key3'] = 'val3';
assert(window.localStorage['key3'] == 'val3');

You can use Map APIs such as containsValue(), clear(), and length:

assert(window.localStorage.containsValue('does not exist') == false);
window.localStorage.clear();
assert(window.localStorage.length == 0);

Mixed-in types

MapMixin<String, String>

Annotations

@Unstable.new()
@Native.new("Storage")

Properties

entries → Iterable<MapEntry<String, String>>: The map entries of this Map.
no setterinherited
hashCode → int: The hash code for this object.
no setterinherited
isEmpty → bool: Whether there is no key/value pair in the map.
no setteroverride
isNotEmpty → bool: Whether there is at least one key/value pair in the map.
no setteroverride
keys → Iterable<String>: The keys of this Map.
no setteroverride
length → int: The number of key/value pairs in the map.
no setteroverride
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
values → Iterable<String>: The values of this Map.
no setteroverride

Methods

addAll(Map<String, String> other) → void: Adds all key/value pairs of other to this map.
override
addEntries(Iterable<MapEntry<String, String>> newEntries) → void: Adds all key/value pairs of newEntries to this map.
inherited
cast<RK, RV>() → Map<RK, RV>: Provides a view of this map as having RK keys and RV instances, if necessary.
inherited
clear() → void: Removes all entries from the map.
override
containsKey(Object? key) → bool: Whether this map contains the given key.
override
containsValue(Object? value) → bool: Whether this map contains the given value.
override
forEach(void f(String key, String value)) → void: Applies action to each key/value pair of the map.
override
map<K2, V2>(MapEntry<K2, V2> transform(String key, String value)) → Map<K2, V2>: Returns a new map where all entries of this map are transformed by the given convert function.
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
putIfAbsent(String key, String ifAbsent()) → String: Look up the value of key, or add a new entry if it isn't there.
override
remove(Object? key) → String?: Removes key and its associated value, if present, from the map.
override
removeWhere(bool test(String key, String value)) → void: Removes all entries of this map that satisfy the given test.
inherited
toString() → String: A string representation of this object.
inherited
update(String key, String update(String value), {String ifAbsent()?}) → String: Updates the value for the provided key.
inherited
updateAll(String update(String key, String value)) → void: Updates all values.
inherited

Operators

operator ==(Object other) → bool: The equality operator.
inherited
operator [](Object? key) → String?: The value for the given key, or null if key is not in the map.
override
operator []=(String key, String value) → void: Associates the key with the given value.
override