Preload pixiv images
// ==UserScript==
// @name Pixiv Image Preload
// @namespace https://greasyfork.org/en/users/37676
// @description Preload pixiv images
// @match *://*.pixiv.net/member_illust.php?*mode=manga*
// @match *://*.pixiv.net/member_illust.php?*mode=medium*
// @match *://*.pixiv.net/*/artworks/*
// @run-at document-end
// @version 2.0.0
// @grant none
// @license Creative Commons Attribution 4.0 International Public License; http://creativecommons.org/licenses/by/4.0/
// ==/UserScript==
var preloadMeta = document.querySelector('meta[name="preload-data"]');
if (preloadMeta)
{
var preloadContent = preloadMeta.getAttribute('content');
if (preloadContent)
{
var illustID = null;
try
{
preloadContent = JSON.parse(preloadContent);
illustID = Object.values(preloadContent.illust)[0].id;
} catch(e) {
}
if (illustID)
{
fetch('https://www.pixiv.net/ajax/illust/'+illustID+'/pages?lang=en').then((response) => {
return response.json();
}).then((imagesObj) => {
if (imagesObj.error == false && Array.isArray(imagesObj.body))
{
var arrayImage = [];
for (const element of imagesObj.body)
{
if (element.urls.regular)
arrayImage.push(element.urls.regular);
}
if (arrayImage.length > 0)
loadImage(0, arrayImage);
}
}).catch(function(error) {
console.log("error fetching json data");
console.log(error);
});
}
}
}
function loadImage(index, arrayImage)
{
if (index < arrayImage.length)
{
var image = new Image();
image.onload = function() {
loadImage(index+1, arrayImage);
};
image.src = arrayImage[index];
}
}