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- Web pages created with HTML alone are static. But Web pages that use scripting languages, such as JavaScript, can be dynamic and interactive. In Introduction to JavaScript, you’ll learn the difference between JavaScript and Java and you’ll incorporate JavaScript into your HTML documents to give your Web pages the oomph they need.
- Understanding Scripting Languages
- If you’re already a programmer, scripting is a snap. If you aren’t, scripting is a great way to delve into the programming world. You’ll learn the foundations of scripting, including setting and using variables, creating expressions using programming loops and conditional statements.
- JavaScript Objects, Properties, and Methods
- Once you have a handle on the basics of scripting, you’ll work on the JavaScript Document Object Model (DOM) to interact with users. For example, you can have a dialog box ask which company your visitor works for, then direct him to his company’s preferred vendor for rental cars, all through the use of JavaScript properties and objects.
- Event-Driven Programming
- Event-driven programming makes your Web site much more user-friendly. Event handling allows you to freely connect your scripting to your user’s actions, like changing the image of a button when the user’s mouse rolls over it.
- Forms and Their Functions
- Most Web users have, at one time or another, filled out a form online. Using basic HTML forms, you’ll explore data validation using JavaScript. For example, a visitor to your site has filled out a form, which promises to register her for a conference. As she submits her completed form, JavaScript checks it to make sure she filled out all required fields. Let’s say she omitted the date for the conference. If that information got to the server’s database, that record would have invalid results and the user wouldn’t know that she wasn’t really registered. But JavaScript can pop up an alert window to inform the user of the missing or invalid information before the server ever sees the request. Of course, there are server-side requirements for all of this to work and we’ll discuss those as well.
- Opening and Closing Windows with JavaScript
- Using JavaScript, you can create Web pages that open and close browser windows based on the user’s actions. For example, your company wants to advertise a Mother’s Day bouquet special for a limited time. Using JavaScript methods, you can open an additional window, enticing users to order their roses now, every time they hit your home page.
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