I have a copy button created by javascript, and its has onclick event like this:

let copyButton = document.createElement("button");

copyButton.onclick = {

   const textLabel = document.createElement('textarea');
   textLabel.value = copyText;
   document.body.appendChild(textLabel);
   textLabel.select();
   document.execCommand('copy');
   document.body.removeChild(textLabel);
};   

It is lose focus when I click this button because the textLabel.select() function call.

What should I do to fix this issue?

Thanks so much.