Information Retrieval and Web Design

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Presentation transcript:

Information Retrieval and Web Design Lecture (11) Prepared by Dr. Dunia Hamid Hameed

Java Script Overview JavaScript is a dynamic computer programming language. It is lightweight and most commonly used as a part of web pages, whose implementations allow client-side script to interact with the user and make dynamic pages. It is an interpreted programming language with object-oriented capabilities.

Advantages of JavaScript The merits of using JavaScript are : Less server interaction. Immediate feedback to the visitors. Increased interactivity. Richer interfaces.

Limitations of JavaScript It lacks the following important features − Client-side JavaScript does not allow the reading or writing of files. This has been kept for security reason. JavaScript cannot be used for networking applications because there is no such support available. JavaScript doesn't have any multithreading or multiprocessor capabilities.

JavaScript - Syntax JavaScript can be implemented using JavaScript statements that are placed within the <script>... </script> HTML tags in a web page.

JavaScript - Syntax You can place the <script> tags, containing your JavaScript, anywhere within your web page, but it is normally recommended that you should keep it within the <head> tags.

JavaScript - Syntax The <script> tag alerts the browser program to start interpreting all the text between these tags as a script.

The script tag takes two important attributes: Language − This attribute specifies what scripting language you are using. Typically, its value will be javascript. Although recent versions of HTML (and XHTML, its successor) have phased out the use of this attribute. Type − This attribute is what is now recommended to indicate the scripting language in use and its value should be set to "text/javascript".

<script language="javascript“ type="text/javascript"> JavaScript code </script>