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Added incremental XMLHttpRequest updates
Summary: @public Previously, our XMLHttpRequest implementation would only update the readyState when the download was fully completed. This diff adds support for receiving incremental data updates as the download happens, which can be monitored by adding the onreadystatechange event handler. As a performance optimization, incremental data updates are only sent if the onreadystatechanged handler has been set in the JS, otherwise it just sends the whole data block once download is complete, as before. Test Plan: * Run the UIExplorer XMLHttpRequest example (in both OSS and Catalyst) to see incremental downloads working. * Run the Movies app to see regular (non-incremental) downloads in action * Run any network-based app in Catalyst shell to verify RKDataManager still works
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| /** | ||
| * The examples provided by Facebook are for non-commercial testing and | ||
| * evaluation purposes only. | ||
| * | ||
| * 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 { | ||
| ProgressViewIOS, | ||
| StyleSheet, | ||
| View, | ||
| Text, | ||
| TouchableHighlight, | ||
| } = React; | ||
|
|
||
| class Downloader extends React.Component { | ||
|
|
||
| xhr: XMLHttpRequest; | ||
| cancelled: boolean; | ||
|
|
||
| constructor(props) { | ||
| super(props); | ||
| this.cancelled = false; | ||
| this.state = { | ||
| downloading: false, | ||
| contentSize: 1, | ||
| downloaded: 0, | ||
| }; | ||
| } | ||
|
|
||
| download() { | ||
| this.xhr && this.xhr.abort(); | ||
|
|
||
| var xhr = this.xhr || new XMLHttpRequest(); | ||
| xhr.onreadystatechange = () => { | ||
| if (xhr.readyState === xhr.HEADERS_RECEIVED) { | ||
| var contentSize = parseInt(xhr.getResponseHeader('Content-Length'), 10); | ||
| this.setState({ | ||
| contentSize: contentSize, | ||
| downloaded: 0, | ||
| }); | ||
| } else if (xhr.readyState === xhr.LOADING) { | ||
| this.setState({ | ||
| downloaded: xhr.responseText.length, | ||
| }); | ||
| } else if (xhr.readyState === xhr.DONE) { | ||
| this.setState({ | ||
| downloading: false, | ||
| }); | ||
| if (this.cancelled) { | ||
| this.cancelled = false; | ||
| return; | ||
| } | ||
| if (xhr.status === 200) { | ||
| alert('Download complete!'); | ||
| } else if (xhr.status !== 0) { | ||
| alert('Error: Server returned HTTP status of ' + xhr.status + ' ' + xhr.responseText); | ||
| } else { | ||
| alert('Error: ' + xhr.responseText); | ||
| } | ||
| } | ||
| }; | ||
| xhr.open('GET', 'http://www.gutenberg.org/cache/epub/100/pg100.txt'); | ||
| xhr.send(); | ||
| this.xhr = xhr; | ||
|
|
||
| this.setState({downloading: true}); | ||
| } | ||
|
|
||
| componentWillUnmount() { | ||
| this.cancelled = true; | ||
| this.xhr && this.xhr.abort(); | ||
| } | ||
|
|
||
| render() { | ||
| var button = this.state.downloading ? ( | ||
| <View style={styles.wrapper}> | ||
| <View style={styles.button}> | ||
| <Text>Downloading...</Text> | ||
| </View> | ||
| </View> | ||
| ) : ( | ||
| <TouchableHighlight | ||
| style={styles.wrapper} | ||
| onPress={this.download.bind(this)}> | ||
| <View style={styles.button}> | ||
| <Text>Download 5MB Text File</Text> | ||
| </View> | ||
| </TouchableHighlight> | ||
| ); | ||
|
|
||
| return ( | ||
| <View> | ||
| {button} | ||
| <ProgressViewIOS progress={(this.state.downloaded / this.state.contentSize)}/> | ||
| </View> | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| exports.framework = 'React'; | ||
| exports.title = 'XMLHttpRequest'; | ||
| exports.description = 'XMLHttpRequest'; | ||
| exports.examples = [{ | ||
| title: 'File Download', | ||
| render() { | ||
| return <Downloader/>; | ||
| } | ||
| }]; | ||
|
|
||
| var styles = StyleSheet.create({ | ||
| wrapper: { | ||
| borderRadius: 5, | ||
| marginBottom: 5, | ||
| }, | ||
| button: { | ||
| backgroundColor: '#eeeeee', | ||
| padding: 10, | ||
| }, | ||
| }); |
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