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52 lines
1.7 KiB
JavaScript
52 lines
1.7 KiB
JavaScript
/*
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Copyright 2020 The Matrix.org Foundation C.I.C.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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export function openFile(mimeType = null) {
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const input = document.createElement("input");
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input.setAttribute("type", "file");
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input.className = "hidden";
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if (mimeType) {
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input.setAttribute("accept", mimeType);
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}
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const promise = new Promise((resolve, reject) => {
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const checkFile = () => {
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input.removeEventListener("change", checkFile, true);
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const file = input.files[0];
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document.body.removeChild(input);
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if (file) {
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resolve(file);
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} else {
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reject(new Error("no file picked"));
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}
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}
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input.addEventListener("change", checkFile, true);
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});
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// IE11 needs the input to be attached to the document
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document.body.appendChild(input);
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input.click();
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return promise;
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}
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export function readFileAsText(file) {
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const reader = new FileReader();
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const promise = new Promise((resolve, reject) => {
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reader.addEventListener("load", evt => resolve(evt.target.result));
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reader.addEventListener("error", evt => reject(evt.target.error));
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});
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reader.readAsText(file);
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return promise;
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}
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