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improved exist check

This commit is contained in:
Danny Coates 2017-08-13 18:44:59 -07:00
parent e1137db946
commit 43fa551a64
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GPG Key ID: 4C442633C62E00CB
1 changed files with 18 additions and 11 deletions
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29
frontend/src/fileList.js
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@ -13,16 +13,20 @@ document.addEventListener('DOMContentLoaded', function() {
fileList = document.getElementById('file-list');
toggleHeader();
// eslint-disable-next-line prefer-const
for (let file of storage.files) {
const id = file.fileId;
checkExistence(id).then(exists => {
if (exists) {
addFile(storage.getFileById(id));
} else {
storage.remove(id);
}
});
}
Promise.all(
storage.files.map(file => {
const id = file.fileId;
return checkExistence(id).then(exists => {
if (exists) {
addFile(storage.getFileById(id));
} else {
storage.remove(id);
}
});
})
)
.catch(err => console.error(err))
.then(toggleHeader);
});
function toggleHeader() {
@ -209,11 +213,14 @@ async function checkExistence(id) {
return new Promise((resolve, reject) => {
const xhr = new XMLHttpRequest();
xhr.onreadystatechange = () => {
if (xhr.readyState === XMLHttpRequest.DONE) {
if (xhr.readyState === XMLHttpRequest.HEADERS_RECEIVED) {
resolve(xhr.status === 200);
}
};
xhr.onerror = reject;
xhr.ontimeout = reject;
xhr.open('get', '/exists/' + id);
xhr.timeout = 2000;
xhr.send();
});
}