css Audio - Active file-generic CSS - Active Generic - Active HTML - Active JS - Active SVG - Active Text - Active file-generic Video - Active header Love html icon-new-collection icon-person icon-team numbered-list123 pop-out spinner split-screen star tv

Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation


Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

        <div id="logindiv">
            <select id="lang">
                <option value="en">English</option>
                <option value="es">Spanish</option>
            <input type="button" value="Login" id="login" />
        <h1 id='greeting'></h1>
              (function(global, $) {
    // 'new' an object
    var Greetr = function(firstName, lastName, language) {
        return new Greetr.init(firstName, lastName, language);   
    // hidden within the scope of the IIFE and never directly accessible
    var supportedLangs = ['en', 'es'];
    // informal greetings
    var greetings = {
        en: 'Hello',
        es: 'Ola'
    // formal greetings
    var formalGreetings = {
        en: 'Greetings',
        es: 'Saludos'
    // logger messages
    var logMessages = {
        en: 'Logged in',
        es: 'Inició sesión'
    // prototype holds methods (to save memory space)
    Greetr.prototype = {
        // 'this' refers to the calling object at execution time
        fullName: function() {
            return this.firstName + ' ' + this.lastName;
        validate: function() {
            // check that is a valid language
            // references the externally inaccessible 'supportedLangs' within the closure
            if (supportedLangs.indexOf(this.language)  === -1) {
                //Throw an error
                throw "Invalid language";
        // retrieve messages from object by referring to properties using [] syntax
        greeting: function() {
            return greetings[this.language] + ' ' + this.firstName + '!';
        formalGreeting: function() {
            return formalGreetings[this.language] + ', ' + this.fullName();  
        // chainable methods return their own containing object
        greet: function(formal) {
            var msg;
            // if undefined or null it will be coerced to 'false'
            if(formal) {
                msg = this.formalGreeting();
            } else {
                msg = this.greeting();
            if (console) {
            // 'this' refers to the calling object at execution time
            // makes the method chainable
            return this;
        log: function() {
            if (console) {
                console.log(logMessages[this.language] + ': ' + this.fullName()); 
            // make chainable
            return this;
        // set the language
        setLang: function(lang) {
            this.language = lang;
            // validate
            // make chainable
            return this;
        HTMLGreeting: function(selector, formal) {
            if (!$) {
                throw 'jQuery not loaded';   
            if (!selector) {
                throw 'Missing jQuery selector';   
            // determine the message
            var msg;
            if (formal) {
                msg = this.formalGreeting();   
            else {
                msg = this.greeting();   
            // inject the message in the chosen place in the DOM
            // make chainable
            return this;
    // the actual object is created here, allowing us to 'new' an object without calling 'new'
    Greetr.init = function(firstName, lastName, language) {
        var self = this;
        self.firstName = firstName || '';
        self.lastName = lastName || '';
        self.language = language || 'en';
    // trick borrowed from jQuery so we don't have to use the 'new' keyword
    Greetr.init.prototype = Greetr.prototype;
    // attach our Greetr to the global object, and provide a shorthand '$G' for ease our poor fingers
    global.Greetr = global.G$ = Greetr;

}(window, jQuery));

// gets a new object (the architecture allows us to not have to use the 'new' keyword here)
var g = G$('Rich', 'Holman');

// use our chainable methods

// let's use our object on the click of the login button
$('#login').click(function() {
    // create a new 'Greetr' object (let's pretend we know the name from the login)
    var loginGrtr = G$('Rich', 'Holman');
     // fire off an HTML greeting, passing the '#greeting' as the selector and the chosen language, and log the welcome as well
    loginGrtr.setLang($('#lang').val()).HTMLGreeting('#greeting', true).log();
🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.
Loading ..................