JavaScript Introduction

What is JavaScript?

JavaScript is a scripting language that enables web developers/designers to build more functional and interactive websites.

Common uses of JavaScript include:

    Alert messages
    Popup windows
    Dynamic dropdown menus
    Form validation
    Displaying date/time

JavaScript usually runs on the client-side (the browser's side), as opposed to server-side (on the web server). One benefit of doing this is performance. On the client side, JavaScript is loaded into the browser and can run as soon as it is called. Without running on the client side, the page would need to refresh each time you needed a script to run.
What do I need to create JavaScript?

You can create JavaScript using the same equipment you use when creating HTML. That is:

    Computer
    Text editor. For example, Notepad (for Windows), Pico (for Linux), or Simpletext (Mac). You could use a HTML editor if you like but it's not needed.
    Web Browser. For example, Internet Explorer or Firefox. You will need to ensure JavaScript is enabled within your browser's settings (this is normally enabled by default).

The next lesson will show you how to enable/disable JavaScript in your browser.