simple fuction that copies a text to clipboard.

copyToClipboard.js

 jQuery('#copy').on('click', function () {
        copyToClipboard();
    });

    function copyToClipboard() {
        var target = jQuery('#hidden_text');

        // make it visible, so can be focused
        target.attr('type', 'text');
        target.focus();
        // select all the text
        target[0].setSelectionRange(0, target.val().length);

        // copy the selection
        var succeed;
        try {
            succeed = document.execCommand("copy");
        } catch (e) {
            succeed = false;
        }

        // hide input again
        target.attr('type', 'hidden');

        return succeed;
    }