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//@see http://blog.codeinside.eu/2016/05/12/copy-to-clipboard-with-javascript

        function detectIE() {
            var ua = window.navigator.userAgent;

            var msie = ua.indexOf('MSIE ');
            if (msie > 0) {
                // IE 10 or older => return version number
                return parseInt(ua.substring(msie + 5, ua.indexOf('.', msie)), 10);
            }

            var trident = ua.indexOf('Trident/');
            if (trident > 0) {
                // IE 11 => return version number
                var rv = ua.indexOf('rv:');
                return parseInt(ua.substring(rv + 3, ua.indexOf('.', rv)), 10);
            }

            // other browser or edge
            return false;
        }

        // source: http://stackoverflow.com/questions/400212/how-do-i-copy-to-the-clipboard-in-javascript
        // enhancement with special case for IEs, otherwise the temp textarea will be visible
        function copyTextToClipboard(text) {

            if (detectIE()) {
                try {
                    window.clipboardData.setData('Text', text);
                    console.log('Copying text command via IE-setData');
                } catch (err) {
                    console.log('Oops, unable to copy via IE-setData');
                }
            }
            else {

                var textArea = document.createElement("textarea");

                //
                //  This styling is an extra step which is likely not required. 
                //
                // Why is it here? To ensure:
                // 1. the element is able to have focus and selection.
                // 2. if element was to flash render it has minimal visual impact.
                // 3. less flakyness with selection and copying which might occur if
                //    the textarea element is not visible.
                //
                // The likelihood is the element won't even render, not even a flash,
                // so some of these are just precautions. 
                // 
                // However in IE the element
                // is visible whilst the popup box asking the user for permission for
                // the web page to copy to the clipboard. To prevent this, we are using 
                // the detectIE workaround.

                // Place in top-left corner of screen regardless of scroll position.
                textArea.style.position = 'fixed';
                textArea.style.top = 0;
                textArea.style.left = 0;

                // Ensure it has a small width and height. Setting to 1px / 1em
                // doesn't work as this gives a negative w/h on some browsers.
                textArea.style.width = '2em';
                textArea.style.height = '2em';

                // We don't need padding, reducing the size if it does flash render.
                textArea.style.padding = 0;

                // Clean up any borders.
                textArea.style.border = 'none';
                textArea.style.outline = 'none';
                textArea.style.boxShadow = 'none';

                // Avoid flash of white box if rendered for any reason.
                textArea.style.background = 'transparent';


                textArea.value = text;

                document.body.appendChild(textArea);

                textArea.select();

                try {
                    var successful = document.execCommand('copy');
                    var msg = successful ? 'successful' : 'unsuccessful';
                    console.log('Copying text command was ' + msg);
                } catch (err) {
                    console.log('Oops, unable to copy');
                }

                document.body.removeChild(textArea);
            }

        }