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let attachments = [];
const headers = document.querySelector(".create-update .headers");
headers.classList.remove("no-js");
const attachmentsNode = document.getElementById("attachment-list");
attachmentsNode.style.display = '';
const helpNode = attachmentsNode.querySelector(".help");
const attachmentsInput = headers.querySelector("input[type='file']");
attachmentsInput.removeAttribute("name");
attachmentsInput.addEventListener("input", ev => {
const files = attachmentsInput.files;
for (let i = 0; i < files.length; i++) {
attachFile(files[i]);
}
});
window.addEventListener("dragenter", dragNOP);
window.addEventListener("dragleave", dragNOP);
window.addEventListener("dragover", dragNOP);
window.addEventListener("drop", ev => {
ev.preventDefault();
const files = ev.dataTransfer.files;
for (let i = 0; i < files.length; i++) {
attachFile(files[i]);
}
});
function dragNOP(e) {
e.stopPropagation();
e.preventDefault();
}
const sendButton = document.getElementById("send-button"),
saveButton = document.getElementById("save-button");
const attachmentUUIDsNode = document.getElementById("attachment-uuids");
function updateState() {
let complete = true;
for (let i = 0; i < attachments.length; i++) {
const a = attachments[i];
const progress = a.node.querySelector(".progress");
progress.style.width = `${Math.floor(a.progress * 100)}%`;
complete &= a.progress === 1.0;
if (a.progress === 1.0) {
progress.style.display = 'none';
}
}
if (complete) {
sendButton.removeAttribute("disabled");
saveButton.removeAttribute("disabled");
} else {
sendButton.setAttribute("disabled", "disabled");
saveButton.setAttribute("disabled", "disabled");
}
attachmentUUIDsNode.value = attachments.
filter(a => a.progress === 1.0).
map(a => a.uuid).
join(",");
}
function attachFile(file) {
helpNode.remove();
const xhr = new XMLHttpRequest();
const node = attachmentNodeFor(file);
const attachment = {
node: node,
progress: 0,
xhr: xhr,
};
attachments.push(attachment);
attachmentsNode.appendChild(node);
let formData = new FormData();
formData.append("attachments", file);
xhr.open("POST", "/compose/attachment");
xhr.upload.addEventListener("progress", ev => {
attachment.progress = ev.loaded / ev.total;
updateState();
});
xhr.addEventListener("load", () => {
// TODO: Handle errors
const resp = JSON.parse(xhr.responseText);
attachment.uuid = resp[0];
updateState();
});
xhr.send(formData);
updateState();
}
function attachmentNodeFor(file) {
const node = document.createElement("div"),
progress = document.createElement("span"),
filename = document.createElement("span"),
size = document.createElement("span"),
button = document.createElement("button");
node.classList.add("upload");
progress.classList.add("progress");
node.appendChild(progress);
filename.classList.add("filename");
filename.innerText = file.name;
node.appendChild(filename);
size.classList.add("size");
size.innerText = formatSI(file.size) + "B";
node.appendChild(size);
button.innerHTML = "×";
node.appendChild(button);
return node;
}
// via https://github.com/ThomWright/format-si-prefix; MIT license
// Copyright (c) 2015 Thom Wright
const PREFIXES = {
'24': 'Y', '21': 'Z', '18': 'E', '15': 'P', '12': 'T', '9': 'G', '6': 'M',
'3': 'k', '0': '', '-3': 'm', '-6': 'µ', '-9': 'n', '-12': 'p', '-15': 'f',
'-18': 'a', '-21': 'z', '-24': 'y'
};
function formatSI(num) {
if (num === 0) {
return '0';
}
let sig = Math.abs(num); // significand
let exponent = 0;
while (sig >= 1000 && exponent < 24) {
sig /= 1000;
exponent += 3;
}
while (sig < 1 && exponent > -24) {
sig *= 1000;
exponent -= 3;
}
const signPrefix = num < 0 ? '-' : '';
if (sig > 1000) {
return signPrefix + sig.toFixed(0) + PREFIXES[exponent];
}
return signPrefix + parseFloat(sig.toPrecision(3)) + PREFIXES[exponent];
}
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