<script>
// Declare function to get selected text from document
function getSelectionText() {
var text = "";
if (window.getSelection) {
text = window.getSelection().toString();
} else if (document.selection && document.selection.type != "Control") {
text = document.selection.createRange().text;
}
return text;
}

// Declare function on copy event
document.addEventListener('copy', function(e){
dataLayer.push({
'event': 'textCopied',
'clipboardText': getSelectionText(),
'clipboardLength': getSelectionText().length
});
});
</script>