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Basic userscript implementation of the Imagus Hoverzoom extension
// ==UserScript==
// @name Hover Zoom Revamped
// @namespace http://tampermonkey.net/
// @version 0.2
// @description Basic userscript implementation of the Imagus Hoverzoom extension
// @author TetteDev
// @match *://*/*
// @icon data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
// @license MIT
// @run-at document-start
// @noframes
// ==/UserScript==
const HoverImageId = `hover_image_${makeid(6)}`;
const HoverAttribute = "data-hoverable";
const NodeIsImage = (node) => { return node.tagName === "IMG" || node.nodeName === "IMG"; };
let mouseX = 0;
let mouseClientX = 0;
let mouseY = 0;
let mouseClientY = 0;
let renderAtMousePosition = false;
if (renderAtMousePosition) {
const fnUpdateMousePosition = (e) => {
mouseX = e.pageX;
mouseClientX = e.clientX;
mouseY = e.pageY;
mouseClientY = e.clientY;
};
document.addEventListener('mousemove', fnUpdateMousePosition, false);
};
function containsImageDimensions(url) {
const dimensionRegex = /(\d{2,4})x(\d{2,4})/;
const match = url.match(dimensionRegex);
if (match) {
const width = parseInt(match[1], 10);
const height = parseInt(match[2], 10);
if (width > 0 && height > 0 && width <= 10000 && height <= 10000) {
return {
width: width,
height: height
};
}
}
return null;
}
function isLazyLoaded(imgElement) {
if (!imgElement || imgElement.tagName.toLowerCase() !== 'img') {
return false;
}
if (imgElement.hasAttribute('loading') && imgElement.getAttribute('loading') === 'lazy') {
return true;
}
const lazyAttributes = ['data-src', 'data-lazy-src', 'data-srcset'];
if (lazyAttributes.some((attr) => imgElement.hasAttribute(attr))) {
return true;
}
const possibleIndicatorsClassnameLazy = ["lazy", "lazyloaded"];
if (possibleIndicatorsClassnameLazy.some((lazy) => imgElement.className.includes(lazy))) {
return true;
}
// check if src might contain 'lazy' or 'lazyloaded'
return false;
}
function makeid(length, allowedCharacters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz') {
let result = '';
const characters = allowedCharacters || 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
const charactersLength = characters.length;
let counter = 0;
while (counter < length) {
result += characters.charAt(Math.floor(Math.random() * charactersLength));
counter += 1;
}
return result;
}
(function() {
'use strict';
const fnTryQuerySelector = (node, selector, all = false) => {
if (!node) return [];
if (!selector) return [];
try {
return all ? node.querySelectorAll(selector) : node.querySelector(selector);
} catch (err) { return []; }
};
const fnTryHasAttribute = (node, attributeName) => {
if(typeof node === 'object' && node !== null && 'getAttribute' in node && node.hasAttribute(attributeName)) return true;
else return false;
};
window.addEventListener('load', function () {
document.querySelectorAll("img").forEach((node) => {
const isImageOrContainsImage = NodeIsImage(node) || (fnTryQuerySelector(node, "img", true).length > 0);
if (isImageOrContainsImage) {
if (fnTryHasAttribute(node, HoverAttribute)) return;
node.setAttribute(HoverAttribute, "true");
node.addEventListener("mouseenter", OnElementMouseEnter); node.addEventListener("mouseleave", OnElementMouseLeave);
}
});
new MutationObserver((mutationRecords, observer) => {
mutationRecords.forEach((mutation) => {
const addedNodes = mutation.addedNodes;
if (addedNodes.length == 0) return;
addedNodes.forEach((node) => {
if (node.id === HoverImageId) return;
if (fnTryHasAttribute(node, HoverAttribute)) return;
const isImageOrContainsImage = NodeIsImage(node) || (fnTryQuerySelector(node, "img", true).length > 0);
// TODO: if NodeIsImage(node) returned false but isImageOrContainsImage is still true
// determine if its worth making it hoverable by checking the child "img" tags in that
// element and confirming they meet some kind of requirements, such as
// bigger than some size, child images count is only 1 etc etc
if (isImageOrContainsImage) {
node.setAttribute(HoverAttribute, "true");
node.addEventListener("mouseenter", OnElementMouseEnter); node.addEventListener("mouseleave", OnElementMouseLeave);
}
});
});
}).observe(document, { attributes: false, childList: true, characterData: false, subtree: true });
});
function OnElementMouseEnter(event) {
OnElementMouseLeave(null);
const targetImage = NodeIsImage(event.currentTarget) ? event.currentTarget : event.currentTarget.querySelector("img");
let targetImageSource = "";
if (isLazyLoaded(targetImage)) {
let dataSetUrls = targetImage.hasAttribute("data-srcset") ? targetImage.getAttribute("data-srcset").split(',').map((url) => url.trim().split(' ')[0]) : [];
if (dataSetUrls) {
targetImageSource = dataSetUrls.pop();
}
else {
targetImageSource = targetImage.getAttribute("data-src");
}
}
else {
targetImageSource = targetImage.src;
}
if (!targetImageSource) {
targetImageSource = targetImage.getAttribute("data-src") || targetImage.src || null;
if (!targetImageSource) {
event.currentTarget.removeEventListener("mouseenter", OnElementMouseEnter);
event.currentTarget.removeEventListener("mouseleave", OnElementMouseLeave);
return;
}
}
let isBase64 = targetImageSource.includes("base64");
let width = "auto";
let height = "auto";
let urlDerivedImageDimensions = isBase64 ? null : containsImageDimensions(targetImageSource);
if (urlDerivedImageDimensions) {
width = `${urlDerivedImageDimensions.width}px`;
height = `${urlDerivedImageDimensions.height}px`;
} else {
let hasWidthAttribute = targetImage.hasAttribute("width");
if (hasWidthAttribute) width = `${targetImage.getAttribute("width")}px`;
let hasHeightAttribute = targetImage.hasAttribute("height");
if (hasHeightAttribute) height = `${targetImage.getAttribute("height")}px`;
}
// Default: render it at the center of the page
let renderPositionX = "50%";
let renderPositionY = "50%";
if (renderAtMousePosition) {
// Render at mouse
renderPositionX = `${(mouseX)}px`;
renderPositionY = `${(mouseY)}px`;
// Render at mouse with some offset
/*
const imageWidth = parseInt(width);
const imageHeight = parseInt(height);
renderPositionX = (mouseClientX + (imageWidth / 2));
if (renderPositionX + imageWidth > window.innerWidth) {
renderPositionX = window.innerWidth - imageWidth;
}
renderPositionY = (mouseClientY + (imageHeight / 2));
if (renderPositionY + imageHeight > window.innerHeight) {
renderPositionY = window.innerHeight - imageHeight;
}
renderPositionX = `${renderPositionY}px`;
renderPositionY = `${renderPositionY}px`;
*/
// Render at mouse but use percentages relative to the page view
/*
const xOffsetPercentage = 20;
const yOffsetPercentage = 25;
const xPositionPercentage = ((mouseX/window.innerWidth)*100) + xOffsetPercentage;
const yPositionPercentage = ((mouseY/window.innerHeight)*100) + yOffsetPercentage;
renderPositionX = `${xPositionPercentage}%`;
renderPositionY = `${yPositionPercentage}%`;
*/
}
const hover = document.createElement("img");
hover.src = targetImageSource;
hover.id = HoverImageId;
hover.style.cssText = `
margin: 0 auto;
position: ${(renderAtMousePosition ? 'absolute' : 'fixed')};
left: ${renderPositionX} !important;
top: ${renderPositionY} !important;
transform: translate(-50%, -50%);
width: ${width} !important;
height: ${height} !important;
z-index: 9999;
border: 1px dashed red;`;
document.body.appendChild(hover);
}
function OnElementMouseLeave(event) {
let hover = document.querySelector(`#${HoverImageId}`);
if (hover) hover.remove();
}
})();