Copy/Paste for noVNC Proxmox

readme.md

1. Install Tampermonkey for your browser (https://chrome.google.com/webstore/detail/tampermonkey/dhdgffkkebhmkfjojejmpbldmpobfkfo?hl=en)
2. Open up this script in "Raw" (or go to this url: https://gist.github.com/amunchet/4cfaf0274f3d238946f9f8f94fa9ee02/raw/0b84970f89e1f282f09b86d46227eda71178c040/noVNCCopyPasteProxmox.user.js)
3. Click install
4. [Optional] if you have a non-US keyboard layout, you may need to modify the script.
5. Copy some text to your clipboard (highlight some text and Ctrl + C)
6. Open up your Promox console
7. Right click to paste the text into the console (you may need to restart your browser, depending on your tampermonkey installation)

Note: if you use LXC containers, you do not need this script, as you can just copy and paste normally from that terminal.

noVNCCopyPasteProxmox.user.js

// ==UserScript==
// @name         noVNC Paste for Proxmox
// @namespace    http://tampermonkey.net/
// @version      0.2a
// @description  Pastes text into a noVNC window (for use with Proxmox specifically)
// @author       Chester Enright
// @match        https://*
// @include      /^.*novnc.*/
// @require http://code.jquery.com/jquery-3.3.1.min.js
// @grant        none
// ==/UserScript==
const delay = 1
;(function () {
    'use strict'
    window.sendString = function(text) {

        var el = document.getElementById("canvas-id")
        text.split("").forEach(x=>{
            setTimeout(()=>{
                 var needs_shift = x.match(/[A-Z!@#$%^&*()_+{}:\"<>?~|]/)
                 let evt
                 if (needs_shift) {

                     evt = new KeyboardEvent("keydown", {keyCode: 16})
                     el.dispatchEvent(evt)
                     evt = new KeyboardEvent("keydown", {key: x, shiftKey: true})
                     el.dispatchEvent(evt)
                     evt = new KeyboardEvent("keyup", {keyCode: 16})
                     el.dispatchEvent(evt)

                 }else{
                     evt = new KeyboardEvent("keydown", {key: x})
                }
                el.dispatchEvent(evt)
            }, delay)
        })

    }


    $(document).ready(function() {
        setTimeout(()=>{
            console.log("Starting up noVNC Copy/Paste (for Proxmox)")

            $("canvas").attr("id", "canvas-id")

            $("canvas").on("mousedown", (e)=>{
                if(e.button == 2){ // Right Click
                    // clipboard version
                    //
                    // navigator.clipboard.readText().then(text =>{
                    //    window.sendString(text)
                    //})
                    
                    // Native js promt version
                    //
                    let text = prompt("Enter text to paste:");
                    if (text != null) window.sendString(text);
                }
            })
        }, 1000);
    })


})()

Your solution didn't work in my case, but many thanks for the idea! Take a look, maybe this be useful for you too =)