Answers for "new clipboardjs('.copy-btn');"

copy button value to clipboard function javascript

//U need to have a button with the id the same as its name because it is going to be sent to the clipborad.
/*Like this: */
<button onClick="SelfCopy(this.id)"  id="1">1</button>
<button onClick="SelfCopy(this.id)"  id="2">2</button>
<button onClick="SelfCopy(this.id)"  id="3">3</button>

function SelfCopy(copyText)
  {
      navigator.clipboard.writeText(copyText);
      alert("You just copied this: (" + copyText + ").");
  }

copy to clipboard using javascript

function handleCopyTextFromParagraph() {
  const cb = navigator.clipboard;
  const paragraph = document.querySelector('p');
  cb.writeText(paragraph.innerText).then(() => alert('Text copied'));
}