clipboard.js/assets/scripts/demos.js

var clipboardDemos = new Clipboard('[data-clipboard-demo]');

clipboardDemos.on('success', function(e) {
    e.clearSelection();

    console.info('Action:', e.action);
    console.info('Text:', e.text);
    console.info('Trigger:', e.trigger);

    showTooltip(e.trigger, 'Copied!');
});

clipboardDemos.on('error', function(e) {
    console.error('Action:', e.action);
    console.error('Trigger:', e.trigger);

    showTooltip(e.trigger, fallbackMessage(e.action));
});