snapdrop/app/elements/text-sharing/clipboard-behavior.html

<script>
'use strict';
(function(document) {
    var copyTextarea = document.createElement('textarea');
    copyTextarea.setAttribute('id', 'clipboard-textarea');
    var style = copyTextarea.style;
    style.position = 'absolute';
    style.top = '-10000px';
    document.body.appendChild(copyTextarea);

    window.Chat.ClipboardBehavior = {
        copyToClipboard: function(content) {
            copyTextarea.value = content;
            var range = document.createRange();
            range.selectNode(copyTextarea);
            window.getSelection().addRange(range);

            try {
                // Now that we've selected the anchor text, execute the copy command  
                var successful = document.execCommand('copy');
                if (successful) {
                    app.displayToast('Copied text to clipboard. Paste it where you want!');
                } else {
                    console.log('failed to copy to clipboard', successful);
                }
            } catch (err) {
                console.log('Oops, unable to copy', err);
            }

            // Remove the selections - NOTE: Should use
            // removeRange(range) when it is supported  
            window.getSelection().removeAllRanges();
        }
    };
}(document));
</script>