forked from enviPath/enviPy
78 lines
2.1 KiB
JavaScript
78 lines
2.1 KiB
JavaScript
/****************************************************************************
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* Copyright 2017 EPAM Systems
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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***************************************************************************/
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import { h, Component } from 'preact';
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/** @jsx h */
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import fs from 'filesaver.js';
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class SaveButton extends Component {
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constructor({filename="unnamed", type="text/plain", className='', ...props}) {
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super({filename, type, className, ...props});
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fileSaver(props.server).then(saver => {
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this.setState({saver});
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});
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}
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save(ev) {
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const noop = () => null;
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const { filename, data, type, onSave = noop, onError = noop } = this.props;
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if (this.state.saver && data)
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try {
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this.state.saver(data, filename, type);
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onSave();
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}
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catch(e) {
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onError(e);
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}
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ev.preventDefault();
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}
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render() {
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let { children, filename, data, className, ...props } = this.props;
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if (!this.state.saver || !data)
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className = `disabled ${className}`;
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return (
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<a download={filename} onClick={ev => this.save(ev)}
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className={className} {...props}>
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{ children }
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</a>
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);
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}
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}
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function fileSaver(server) {
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return new Promise((resolve, reject) => {
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if (global.Blob && fs.saveAs) {
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resolve((data, fn, type) => {
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const blob = new Blob([data], { type });
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fs.saveAs(blob, fn);
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});
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} else if (server) {
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resolve(server.then(() => {
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throw "Server doesn't still support echo method";
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}));
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} else
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reject(new Error("Your browser does not support " +
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"opening files locally"));
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});
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}
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export default SaveButton;
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