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Improve downloading of discographies with the addition of an item count and total size.
目前为
// ==UserScript==
// @name Bandcamp Helper
// @namespace V.L
// @version 1.1.0
// @description Improve downloading of discographies with the addition of an item count and total size.
// @author Valerio Lyndon
// @match https://bandcamp.com/download*
// @grant none
// @license AGPL-3.0-or-later
// ==/UserScript==
class MassDownload {
constructor( ){
this.wrapper = document.createElement('li');
this.paragraph = document.createElement('p');
this.wrapper.append(this.paragraph);
document.querySelector('.download_list').prepend(this.wrapper);
this.dropdowns = document.querySelectorAll('select#format-type');
for( let dropdown of this.dropdowns ){
dropdown.addEventListener('change', ()=>{
this.calculateBytes();
});
}
this.calculateBytes();
}
calculateBytes( ){
let totalBytes = 0;
let totalItems = this.dropdowns.length;
for( let dropdown of this.dropdowns ){
dropdown.addEventListener('change', this.calculateBytes);
let selected = false;
for( let opt of dropdown.getElementsByTagName('option') ){
if( opt && opt.selected ){
selected = opt;
}
}
if( !selected ){
console.log('skipping 1 entry due to unknown format');
continue;
}
let match = selected.textContent.match(/([\d\.]+)([A-Za-z][bB])/);
let bytes = Number(match[1]);
let byteFormat = match[2];
switch( byteFormat.toUpperCase() ){
case 'TB':
bytes *= 1024;
case 'GB':
bytes *= 1024;
case 'MB':
bytes *= 1024;
case 'KB':
bytes *= 1024;
}
totalBytes += bytes;
}
function formatBytes( bytes ){
let format = 'B';
if( bytes / 1024 >= 1 ){
bytes /= 1024;
format = 'KiB';
}
if( bytes / 1024 >= 1 ){
bytes /= 1024;
format = 'MiB';
}
if( bytes / 1024 >= 1 ){
bytes /= 1024;
format = 'GiB';
}
if( bytes / 1024 >= 1 ){
bytes /= 1024;
format = 'TiB';
}
// round to two decimal places
bytes = Math.round(bytes*100) / 100;
return `${bytes}${format}`;
}
this.paragraph.textContent = `Total download size for ${totalItems} items of selected quality is ${formatBytes(totalBytes)}`;
}
}
document.querySelector('.bfd-download-dropdown').addEventListener('click', ()=>{ new MassDownload(); });