Client-side JavaScript is the most common form of the language. The script should be included in or referenced by an HTML document for the code to be interpreted by the browser.
It means that a web page need no longer be static
HTML, but can include programs that interact with the user, control the
browser, and dynamically create HTML content.
The JavaScript client-side mechanism features many
advantages over traditional CGI server-side scripts. For example, you might use
JavaScript to check if the user has entered a valid e-mail address in a form
field.
The JavaScript code is executed when the user
submits the form, and only if all the entries are valid they would be submitted
to the Web Server.
JavaScript can be used to trap user-initiated events
such as button clicks, link navigation, and other actions that the user
explicitly or implicitly initiates.
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