41 lines
1.4 KiB
JavaScript
41 lines
1.4 KiB
JavaScript
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/*
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* Copyright (C) 2017 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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function requestJson(url, action, params) {
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return new Promise((resolve, reject) => {
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const xhr = new XMLHttpRequest();
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xhr.overrideMimeType('application/json');
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xhr.addEventListener('load', () => resolve(xhr.responseText));
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xhr.addEventListener('error', () => reject('failed to execute network request'));
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xhr.open(action, url);
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if (params) {
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xhr.send(JSON.stringify(params));
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} else {
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xhr.send();
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}
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}).then(responseText => {
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try {
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return JSON.parse(responseText);
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}
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catch (e) {
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return Promise.reject('invalid JSON response');
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}
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});
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}
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