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University of Tripoli
Faculty of Information Technology
Department of Software Engineering
JavaScript Basics
Introduction to Internet Programming
ITGS 226 -- F2023
By: Fatima Ben Lashihar
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INTRODUCTION
• JavaScript is the most popular and widely used client-side scripting language.
• JavaScript is designed to add interactivity and dynamic effects to the web pages by manipulating the content returned from a web server.
• JavaScript is an object-oriented language, and it also has some similarities in syntax to Java programming language. But, JavaScript is not related to Java in any way.
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What can do with Javascript
• Modify the content of a web page by adding or removing elements
(Example)
• Change the style and position of the elements on a web page
(Example)
• Monitor events like mouse click, hover, etc. and react to it (Example)
• Create alert pop-ups to display info or warning messages to the user
(Example)
• Validate user inputs before submitting it to the server (Example)
3
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ADDING JAVASCRIPT TO WEB PAGES
• There are typically three ways to add JavaScript to a web page:
1. Embedding (internal) the JavaScript code between a pair
of tag.
2. Creating an external JavaScript file with the .js extension
and then load it within the page through the src attribute
of the tags.
• The
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CALLING AN EXTERNAL JAVASCRIPT FILE
• Placing JavaScript code into a separate file with a (.js) extension, and then call that file in your document through the src attribute of the