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94 lines
3.8 KiB
JavaScript
94 lines
3.8 KiB
JavaScript
/*****************************************************************************
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* Open MCT, Copyright (c) 2014-2018, United States Government
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* as represented by the Administrator of the National Aeronautics and Space
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* Administration. All rights reserved.
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*
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* Open MCT is licensed under the Apache License, Version 2.0 (the
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* "License"); 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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* 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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* Open MCT includes source code licensed under additional open source
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* licenses. See the Open Source Licenses file (LICENSES.md) included with
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* this source code distribution or the Licensing information page available
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* at runtime from the About dialog for additional information.
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*****************************************************************************/
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/**
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* @namespace platform/exporters
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*/
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define(['csv'], function (CSV) {
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/**
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* Callback used to initiate saving files from the export service;
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* typical implementation is
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* [FileSaver.js](https://github.com/eligrey/FileSaver.js/).
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* @callback platform/exporters.ExportService~saveAs
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* @param {Blob} blob the contents of the file to export
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* @param {string} filename the name of the file to export
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*/
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/**
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* The `exportService` provides a means to initiate downloads of
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* structured data in the CSV format.
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* @param {platform/exporters.ExportService~saveAs} saveAs function
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* used to initiate saving files
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* @constructor
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* @memberof platform/exporters
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*/
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function ExportService(saveAs) {
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this.saveAs = saveAs;
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}
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/**
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* Export a set of data as comma-separated values. Triggers a download
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* using the function provided when the ExportService was instantiated.
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*
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* @param {Object[]} rows an array of objects containing key-value pairs,
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* where keys are header names, and values are values
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* @param {ExportOptions} [options] additional parameters for the file
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* export
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*/
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ExportService.prototype.exportCSV = function (rows, options) {
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var headers = (options && options.headers) ||
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(Object.keys((rows[0] || {})).sort()),
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filename = (options && options.filename) || "export.csv",
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csvText = new CSV(rows, { header: headers }).encode(),
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blob = new Blob([csvText], { type: "text/csv" });
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this.saveAs(blob, filename);
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};
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/**
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* Export an object as a JSON file. Triggers a download using the function
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* provided when the ExportService was instantiated.
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*
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* @param {Object} obj an object to be exported as JSON
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* @param {ExportOptions} [options] additional parameters for the file
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* export
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*/
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ExportService.prototype.exportJSON = function (obj, options) {
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var filename = (options && options.filename) || "test-export.json";
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var jsonText = JSON.stringify(obj);
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var blob = new Blob([jsonText], {type: "application/json"});
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this.saveAs(blob, filename);
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};
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/**
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* Additional parameters for file export.
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* @typedef ExportOptions
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* @property {string} filename the name of the file to write
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* @property {string[]} headers column header names, both as they
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* should appear in the output and as they should be
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* used to look up values from the data set. Defaults
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* to the keys in the first object in the data set.
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*/
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return ExportService;
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});
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