116 строки
2.5 KiB
JavaScript
116 строки
2.5 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @noflow
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*/
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'use strict';
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var React = require('react');
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var ReactNative = require('react-native');
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var {StyleSheet, Text, TouchableHighlight, View} = ReactNative;
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class XHRExampleHeaders extends React.Component {
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xhr: XMLHttpRequest;
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cancelled: boolean;
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constructor(props) {
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super(props);
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this.cancelled = false;
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this.state = {
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status: '',
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headers: '',
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contentSize: 1,
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downloaded: 0,
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};
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}
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download() {
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this.xhr && this.xhr.abort();
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var xhr = this.xhr || new XMLHttpRequest();
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xhr.onreadystatechange = () => {
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if (xhr.readyState === xhr.DONE) {
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if (this.cancelled) {
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this.cancelled = false;
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return;
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}
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if (xhr.status === 200) {
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this.setState({
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status: 'Download complete!',
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headers: xhr.getAllResponseHeaders(),
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});
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} else if (xhr.status !== 0) {
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this.setState({
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status:
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'Error: Server returned HTTP status of ' +
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xhr.status +
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' ' +
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xhr.responseText,
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});
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} else {
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this.setState({
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status: 'Error: ' + xhr.responseText,
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});
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}
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}
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};
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xhr.open(
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'GET',
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'https://httpbin.org/response-headers?header1=value&header2=value1&header2=value2',
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);
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xhr.send();
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this.xhr = xhr;
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this.setState({status: 'Downloading...'});
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}
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componentWillUnmount() {
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this.cancelled = true;
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this.xhr && this.xhr.abort();
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}
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render() {
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var button =
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this.state.status === 'Downloading...' ? (
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<View style={styles.wrapper}>
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<View style={styles.button}>
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<Text>...</Text>
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</View>
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</View>
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) : (
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<TouchableHighlight
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style={styles.wrapper}
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onPress={this.download.bind(this)}>
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<View style={styles.button}>
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<Text>Get headers</Text>
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</View>
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</TouchableHighlight>
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);
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return (
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<View>
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{button}
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<Text>{this.state.headers}</Text>
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</View>
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);
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}
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}
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var styles = StyleSheet.create({
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wrapper: {
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borderRadius: 5,
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marginBottom: 5,
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},
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button: {
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backgroundColor: '#eeeeee',
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padding: 8,
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},
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});
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module.exports = XHRExampleHeaders;
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