Character counter plugin for TinyMCE 4

tinymce.charcount.js

tinymce.PluginManager.add('charcount', function(editor) {

    editor.on('init', function() {

        function getCharacterLength() {
            var text = editor.getContent({format: 'text'});
            // trim and transform newlines ("\n" has a length of 2) to spaces (length = 1)
            text = text.trim().replace(/(\n)+/g, " ");
            return text.length;
        }

        function update() {
            editor.theme.panel.find('#charcount').text(['Characters: {0}', getCharacterLength()]);
        }

        var statusbar = editor.theme.panel && editor.theme.panel.find('#statusbar')[0];
        if (statusbar) {
            window.setTimeout(function() {
                statusbar.insert({
                    type: 'label',
                    name: 'charcount',
                    text: ['Characters: {0}', getCharacterLength()],
                    classes: 'wordcount',
                    disabled: editor.settings.readonly
                }, 0);

                editor.on('keyup setcontent beforeaddundo', function(){
                    update();
                });

            }, 0);
        }

    });

});