CKEditor

HTML

<script src="http://ckeditor.com/apps/ckeditor/4.0/ckeditor.js"></script>
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.0/css/bootstrap-combined.min.css">
<script src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.0/js/bootstrap.min.js"></script>
<h3>CKEditor 4:</h3>

<textarea id="editor1">Test</textarea>

JavaScript

CKEDITOR.on('instanceReady', function(evt) {
    var editor = evt.editor;
    console.log('The editor named ' + editor.name + ' is now ready');

    editor.on('focus', function(e) {
        console.log('The editor named ' + e.editor.name + ' is now focused');
    });
});

CKEDITOR.replace('editor1');