onclick textbox copy javascript code example

Example 1: js select and copy on click

document.getElementById("copy-text").onclick = function() {
  this.select();
  document.execCommand('copy');
  alert(window.getSelection().toString());
}

Example 2: copy text from header tag in javacript

function copyText() {
  var text = document.getElementById("myText").innerText;
  var elem = document.createElement("textarea");
  document.body.appendChild(elem);
  elem.value = text;
  elem.select();
  document.execCommand("copy");
  document.body.removeChild(elem);
}