Inject javascript into almost every website you visit.
// ==UserScript==
// @name InjectJS
// @namespace http://github.com/YTXaos/InjectJS
// @version 1.22
// @description Inject javascript into almost every website you visit.
// @author YTXaos
// @match *://*/*
// @match file:///*
// @icon https://raw.githubusercontent.com/YTXaos/InjectJS/main/assets/logo.png
// @grant GM_addElement
// @license MIT
// @require https://code.jquery.com/jquery-3.6.0.min.js
// ==/UserScript==
(function() {
"use strict";
const url = location.href,
origin = location.origin;
function Option(item) {
if(localStorage.getItem(`inject-js:${item}`)) {
return localStorage.getItem(`inject-js:${item}`).toString();
} else {
return false;
}
}
function onURL(page, mode) {
switch(mode) {
case "exact":
return url === `${origin}${page}`;
case "relative":
return url.includes(page);
default:
console.error("InjectJS: Specify a matching mode.");
}
}
if(Option("disable") == "true") {
document.addEventListener("keyup", function(e) {
e.preventDefault();
if(e.ctrlKey && e.shiftKey && e.key === "y") {
location = "/inject-js/options";
}
});
return;
}
if(onURL("/inject-js/", "exact")) {
location = "https://github.com/YTXaos/InjectJS";
}
Option("startup_log") == "true" && (console.info("InjectJS Loaded. Press Ctrl + Q to topen"));
const popup = document.createElement("div"),
style = document.createElement("style");
fetch("https://raw.githubusercontent.com/YTXaos/InjectJS/main/assets/main.css").then(get => get.text()).then(set => style.innerHTML = set);
popup.setAttribute("class", "js-injector-popup");
popup.style.display = "none";
popup.innerHTML = `<label class="js-inject-header">
<div class="js-logo-needle">.....</div>
Inject<span class="js-logo">JS</span>
</label>
<textarea placeholder="Your code here" class="js-code-inject" spellcheck="false" data-gramm="false" data-gramm_editor="false" data-enable-grammarly="false" id="js-code-inject"></textarea>
<div class="js-btns-section">
<button class="execute-code" disabled>Execute</button>
<button class="js-options-btn">Options</button>
</div>`;
document.head.prepend(style);
document.body.prepend(popup);
function OptionsPage() {
$("link[rel=stylesheet], style, script").remove();
document.title = "InjectJS Options";
fetch("https://raw.githubusercontent.com/YTXaos/InjectJS/main/pages/options.html").then(get => get.text()).then(set => document.body.innerHTML = set);
fetch("https://raw.githubusercontent.com/YTXaos/InjectJS/main/options.js").then(get => get.text()).then(set => GM_addElement(document.head, "script", {
textContent: set
}));
}
const code = document.querySelector(".js-code-inject"),
btn = document.querySelector(".execute-code"), option_btn = document.querySelector(".js-options-btn");
code.addEventListener("input", CheckCode);
code.addEventListener("keydown", Syntax);
btn.addEventListener("click", InjectCode);
option_btn.addEventListener("click", () => { location = "/inject-js/options"; });
function Syntax(e) {
if(e.which === 219) {
e.preventDefault();
const start = code.selectionStart,
end = code.selectionEnd,
selection = code.value.substring(start, end),
replace = `${code.value.substring(0, start)}{\n${selection}\n}${code.value.substring(end)}`;
code.value = replace;
code.focus();
code.selectionEnd = end + 2;
}
if(e.which === 57) {
e.preventDefault();
const start = code.selectionStart,
end = code.selectionEnd,
selection = code.value.substring(start, end),
replace = `${code.value.substring(0, start)}(${selection})${code.value.substring(end)}`;
code.value = replace;
code.focus();
code.selectionEnd = end + 1;
}
if(e.which === 222) {
e.preventDefault();
const start = code.selectionStart,
end = code.selectionEnd,
selection = code.value.substring(start, end),
replace = `${code.value.substring(0, start)}${e.key}${selection}${e.key}${code.value.substring(end)}`;
code.value = replace;
code.focus();
code.selectionEnd = end + 1;
}
}
function CheckCode() {
const code = document.querySelector(".js-code-inject");
if(code.value.length < 5) {
btn.setAttribute("disabled", "disabled");
} else {
btn.removeAttribute("disabled");
}
}
function InjectCode() {
const code = document.querySelector(".js-code-inject").value;
try {
eval(code);
} catch (e) {
if(Option("alert_errors") == "true") {
alert(e.message);
} else {
console.error(e.message);
}
}
}
function ShowInjector() {
dragElement(document.querySelector(".js-injector-popup"));
function dragElement(elmnt) {
var pos1 = 0,
pos2 = 0,
pos3 = 0,
pos4 = 0;
if(document.querySelector(".js-inject-header")) {
document.querySelector(".js-inject-header").onmousedown = dragMouseDown;
} else {
elmnt.onmousedown = dragMouseDown;
}
function dragMouseDown(e) {
e = e || window.event;
e.preventDefault();
pos3 = e.clientX;
pos4 = e.clientY;
document.onmouseup = closeDragElement;
document.onmousemove = elementDrag;
}
function elementDrag(e) {
e = e || window.event;
e.preventDefault();
pos1 = pos3 - e.clientX;
pos2 = pos4 - e.clientY;
pos3 = e.clientX;
pos4 = e.clientY;
elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
}
function closeDragElement() {
document.onmouseup = null;
document.onmousemove = null;
}
}
popup.classList.toggle("show");
}
if(onURL("/inject-js/options", "exact")) {
OptionsPage();
}
document.addEventListener("keyup", function(e) {
e.preventDefault();
if(e.ctrlKey && e.key === "q") {
ShowInjector();
}
});
})();