I used to saw my colleague add a 30kb lib only to implement a copy function that when user clicks on a text, copy it to the clipboard.

And I also saw someone still trying to use flash or Clipboard lib to do same thing.

Here is how to copy text to your clipboard with JavaScript

with just several lines of code. And it’s cross browser and device. No need to any 3rd party lib.

function copyToClipboard(text){
 const ta = document.createElement('textarea');
 ta.value = this.url;
 //hide it
 ta.style.padding = 0;
 ta.style.border = 'none';
 ta.style.outline = 'none';
 ta.style.boxShadow = 'none';
 //select the text

it’s very simple, you just append an invisible textarea to the page, set value as the text you want to copy, and run document.execCommand('copy'). Then remove the textarea from the page.

here is how to copy image to your clipboard with JavaScript

Note that this one only works on Chrome and Edge right now (2020-10) https://caniuse.com/mdn-api_clipboarditem

This requires you to use canvas to port image to blob first.

function imageToBlob(imageURL) {
  const img = new Image;
  const c = document.createElement("canvas");
  const ctx = c.getContext("2d");
  img.crossOrigin = "";
  img.src = imageURL;
  return new Promise(resolve => {
    img.onload = function () {
      c.width = this.naturalWidth;
      c.height = this.naturalHeight;
      ctx.drawImage(this, 0, 0);
      c.toBlob((blob) => {
        // here the image is a blob
      }, "image/png", 0.75);

Then use the Clipboard API to do the magic

async function copyImage(imageURL){
  const blob = await imageToBlob(imageURL)
  const item = new ClipboardItem({ "image/png": blob });

Simple as that.