Before you continue you should have a basic understanding of the following:
- WWW, HTML and the basics of building Web pages
- JavaScript was designed to add interactivity to HTML pages .
- JavaScript is a scripting language - a scripting language is a lightweight programming language .
- A JavaScript is lines of executable computer code .
- A JavaScript is usually embedded directly in HTML pages .
- JavaScript is an interpreted language (means that scripts execute without preliminary compilation) .
- Everyone can use JavaScript without purchasing a license .
- JavaScript is supported by all major browsers, like Netscape and Internet Explorer .
Are Java and JavaScript the same? NO!
Java and JavaScript are two completely different languages!
Java (developed by Sun Microsystems) is a powerful and very complex programming language - in the same category as C and C++.
What can a JavaScript Do?
- JavaScript gives HTML designers a programming tool - HTML authors are normally not programmers, but JavaScript is a scripting language with a very simple syntax! Almost anyone can put small "snippets" of code into their HTML pages .
- JavaScript can put dynamic text into an HTML page - A JavaScript statement like this: document.write("<h1>" + name + "</h1>") can write a variable text into an HTML page .
- JavaScript can react to events - A JavaScript can be set to execute when something happens, like when a page has finished loading or when a user clicks on an HTML element.
- JavaScript can read and write HTML elements - A JavaScript can read and change the content of an HTML element .
- JavaScript can be used to validate data - A JavaScript can be used to validate form data before it is submitted to a server, this will save the server from extra processing .
JavaScript How To ...
The HTML<script> tag is used to insert a JavaScript into an HTML page.
How to Put a JavaScript Into an HTML Page.
<html> The code above will produce this output on an HTML page: |
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