make something copy to clipboard when click code example

Example 1: javascript text to clipboard

function copyToClipboard(text) {
   const elem = document.createElement('textarea');
   elem.value = text;
   document.body.appendChild(elem);
   elem.select();
   document.execCommand('copy');
   document.body.removeChild(elem);
}

Example 2: How to copy text from a div to clipboard

function (container_id, as_html) {
        /*
        isEmpty = function (val) {
              return (val === undefined || val == null || val.length <= 0) ? true : false;
          };
        */
        as_html = isEmpty(as_html) ? false : true;

        //console.log('copyToClipboard: ' + container_id);
        var elem = document.getElementById(container_id);

        // create hidden text element, if it doesn't already exist
        var targetId = "_hiddenCopyText_";
        var isInput = elem.tagName === "INPUT" || elem.tagName === "TEXTAREA";
        var origSelectionStart, origSelectionEnd;
        if (isInput) {
            // can just use the original source element for the selection and copy
            target = elem;
            origSelectionStart = elem.selectionStart;
            origSelectionEnd = elem.selectionEnd;
            //console.log ('_is_input = true');
        } else {
            // must use a temporary form element for the selection and copy
            //console.log ('_is_input = false, creating a textarea = ' + targetId);
            target = document.getElementById(targetId);
            if (!target) {
                var target = document.createElement("textarea");
                target.style.position = "absolute";
                target.style.left = "-9999px";
                target.style.top = "0";
                target.id = targetId;
                document.body.appendChild(target);
            }

            var content = $.trim(as_html ? $(elem).html() :  $(elem).text());
            $(target).text( content);
            console.log ('text_content', content);
        }
        // select the content
        var currentFocus = document.activeElement;
        target.focus();
        target.setSelectionRange(0, content.length);

        // copy the selection
        var succeed;
        try {
            succeed = document.execCommand("copy");
        } catch (e) {
            succeed = false;
        }
        // restore original focus
        if (currentFocus && typeof currentFocus.focus === "function") {
            currentFocus.focus();
        }

        if (isInput) {
            // restore prior selection
            elem.setSelectionRange(origSelectionStart, origSelectionEnd);
        } else {
            // clear temporary content
            $(target).text('');
        }

        return succeed;
    }