react-native/RNTester/js/GeolocationExample.js

84 lines
1.9 KiB
JavaScript

/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @flow
* @providesModule GeolocationExample
*/
'use strict';
var React = require('react');
var ReactNative = require('react-native');
var {
StyleSheet,
Text,
View,
} = ReactNative;
exports.framework = 'React';
exports.title = 'Geolocation';
exports.description = 'Examples of using the Geolocation API.';
exports.examples = [
{
title: 'navigator.geolocation',
render: function(): React.Element<any> {
return <GeolocationExample />;
},
}
];
class GeolocationExample extends React.Component {
state = {
initialPosition: 'unknown',
lastPosition: 'unknown',
};
watchID: ?number = null;
componentDidMount() {
navigator.geolocation.getCurrentPosition(
(position) => {
var initialPosition = JSON.stringify(position);
this.setState({initialPosition});
},
(error) => alert(JSON.stringify(error)),
{enableHighAccuracy: true, timeout: 20000, maximumAge: 1000}
);
this.watchID = navigator.geolocation.watchPosition((position) => {
var lastPosition = JSON.stringify(position);
this.setState({lastPosition});
});
}
componentWillUnmount() {
this.watchID != null && navigator.geolocation.clearWatch(this.watchID);
}
render() {
return (
<View>
<Text>
<Text style={styles.title}>Initial position: </Text>
{this.state.initialPosition}
</Text>
<Text>
<Text style={styles.title}>Current position: </Text>
{this.state.lastPosition}
</Text>
</View>
);
}
}
var styles = StyleSheet.create({
title: {
fontWeight: '500',
},
});