react-native/Examples/UIExplorer/AsyncStorageExample.js

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/**
2015-03-26 18:24:15 +00:00
* The examples provided by Facebook are for non-commercial testing and
* evaluation purposes only.
*
2015-03-26 18:24:15 +00:00
* Facebook reserves all rights not expressly granted.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL
* FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* @flow
*/
'use strict';
var React = require('react-native');
var {
AsyncStorage,
PickerIOS,
Text,
View
} = React;
var PickerItemIOS = PickerIOS.Item;
var STORAGE_KEY = '@AsyncStorageExample:key';
var COLORS = ['red', 'orange', 'yellow', 'green', 'blue'];
var BasicStorageExample = React.createClass({
componentDidMount() {
AsyncStorage.getItem(STORAGE_KEY)
.then((value) => {
if (value !== null){
this.setState({selectedValue: value});
this._appendMessage('Recovered selection from disk: ' + value);
} else {
this._appendMessage('Initialized with no selection on disk.');
}
})
.catch((error) => this._appendMessage('AsyncStorage error: ' + error.message))
.done();
},
getInitialState() {
return {
selectedValue: COLORS[0],
messages: [],
};
},
render() {
var color = this.state.selectedValue;
return (
<View>
<PickerIOS
selectedValue={color}
onValueChange={this._onValueChange}>
{COLORS.map((value) => (
<PickerItemIOS
key={value}
value={value}
label={value}
/>
))}
</PickerIOS>
<Text>
{'Selected: '}
<Text style={{color}}>
{this.state.selectedValue}
</Text>
</Text>
<Text>{' '}</Text>
<Text onPress={this._removeStorage}>
Press here to remove from storage.
</Text>
<Text>{' '}</Text>
<Text>Messages:</Text>
{this.state.messages.map((m) => <Text>{m}</Text>)}
</View>
);
},
_onValueChange(selectedValue) {
this.setState({selectedValue});
AsyncStorage.setItem(STORAGE_KEY, selectedValue)
.then(() => this._appendMessage('Saved selection to disk: ' + selectedValue))
.catch((error) => this._appendMessage('AsyncStorage error: ' + error.message))
.done();
},
_removeStorage() {
AsyncStorage.removeItem(STORAGE_KEY)
.then(() => this._appendMessage('Selection removed from disk.'))
.catch((error) => { this._appendMessage('AsyncStorage error: ' + error.message) })
.done();
},
_appendMessage(message) {
this.setState({messages: this.state.messages.concat(message)});
},
});
exports.title = 'AsyncStorage';
exports.description = 'Asynchronous local disk storage.';
exports.examples = [
{
title: 'Basics - getItem, setItem, removeItem',
render(): ReactElement { return <BasicStorageExample />; }
},
];