Copy button

Adds a command copy button for myname is xyxy
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// ==UserScript==
// @name        Copy button
// @namespace   LukaWolf
// @description Adds a command copy button for myname is xyxy
// @include     *cardcastgame.com/browse/deck/*
// @version     1
// @grant       none
// ==/UserScript==
window.onload = whenLoaded;

unsafeWindow.wolf_copy_to_clipboard =function (){
     var code = window.location.href.split('/').pop();
     copyTextToClipboard("/addcardcast " + code);
}
unsafeWindow.copyTextToClipboard = function (text) {
  var textArea = document.createElement("textarea");

  //
  // *** This styling is an extra step which is likely not required. ***
  //
  // Why is it here? To ensure:
  // 1. the element is able to have focus and selection.
  // 2. if element was to flash render it has minimal visual impact.
  // 3. less flakyness with selection and copying which **might** occur if
  //    the textarea element is not visible.
  //
  // The likelihood is the element won't even render, not even a flash,
  // so some of these are just precautions. However in IE the element
  // is visible whilst the popup box asking the user for permission for
  // the web page to copy to the clipboard.
  //

  // Place in top-left corner of screen regardless of scroll position.
  textArea.style.position = 'fixed';
  textArea.style.top = 0;
  textArea.style.left = 0;

  // Ensure it has a small width and height. Setting to 1px / 1em
  // doesn't work as this gives a negative w/h on some browsers.
  textArea.style.width = '2em';
  textArea.style.height = '2em';

  // We don't need padding, reducing the size if it does flash render.
  textArea.style.padding = 0;

  // Clean up any borders.
  textArea.style.border = 'none';
  textArea.style.outline = 'none';
  textArea.style.boxShadow = 'none';

  // Avoid flash of white box if rendered for any reason.
  textArea.style.background = 'transparent';


  textArea.value = text;

  document.body.appendChild(textArea);

  textArea.select();

  try {
    var successful = document.execCommand('copy');
    var msg = successful ? 'successful' : 'unsuccessful';
    console.log('Copying text command was ' + msg);
  } catch (err) {
    console.log('Oops, unable to copy');
  }

  document.body.removeChild(textArea);
}
function whenLoaded(){
  jQuery(".btn.btn-primary.btn-block").after("<button class=' btn btn-primary btn-block' onclick='wolf_copy_to_clipboard()'>Copy code to clipboard</button>");
}