по аналогии данного решения (реализуйте под свои условия и элементы):
function CopyToClipboard(containerid) {
if (document.selection) {
var range = document.body.createTextRange();
range.moveToElementText(document.getElementById(containerid));
range.select().createTextRange();
document.execCommand("copy");
} else if (window.getSelection) {
var range = document.createRange();
range.selectNode(document.getElementById(containerid));
window.getSelection().addRange(range);
document.execCommand("copy");
alert("Text has been copied, now paste in the text-area")
}
}
<button id="button1" onclick="CopyToClipboard('div1')">Click to copy</button>
<br /><br />
<div id="div1">Text To Copy </div>
<br />
<textarea placeholder="Press ctrl+v to Paste the copied text" rows="5" cols="20"></textarea>