It is possible to add JavaScript to individual HTML tags themselves without using SCRIPT tags. These are often only single lines of code, and are thus nicknamed 'one liners'. This is not the only way to …

The second technique we've seen for triggering a Function in response to a mouse action is to place an onClick Event Handler inside a button type form element, like this:

¤ used to make web pages interactive ¤ insert dynamic text into HTML (ex: a date) ¤ react to events (ex: user clicks on a button) ¤ get information about a user's computer (ex: browser type)

To use JavaScript from an external file source, you need to write all your JavaScript source code in a simple text file with the extension ".js" and then include that file as shown above.

In these pages, text used within HTML, CSS or JavaScript files is generally shown in courier new (i.e. a fixed space) font. The pages contain links to an extensive body of reference material explaining …

This file is a fairly standard HTML5 page that contains a button with an ID of button. The ID attribute is very useful for JavaScript to use as a hook to access different elements of the page.

Examples in Each Chapter This JavaScript tutorial contains more than 200 examples! With our online editor, you can edit the JavaScript code, and click on a button to view the result.