Question

Discuss how to implement a simple newsreader/ aggregator using Python.

Discuss AJAX and what it’s used for.

Discuss where and why to use SVG.

Answer 1

AJAX and what it’s used for :

• AJAX means Asynchronous JavaScript and XML.
• It is mainly used for the creation of dynamic web pages.
• By using AJAX any portion of the html page can be updated without refreshing or visiting a new link.
• It can be used to create faster , better and highly interactive web based applications.
• Here the main language used are HTML, XML, JavaScript, CSS.
• For manipulating contents XHTML is used.
• For styling or design, CSS is used.
• For displaying the contents dynamically on the web page, JavaScript is used.
• In ordinary form, when we fill a form and submit it, we go to a new page for result.
• But in case of AJAX, when we submit a form, JavaScript will make a request to the server and it will interpret the results and update on the same page, instead of going to new page.
• It reduces unwanted links to external pages.
• Here server data is mainly received in the form of XML.
• It is independent of the web server used , because it is mainly running on the browser.
• All the requests take place in the background, therefore we can continue to use the application at the same time when we made a request.
• AJAX is a client side script that can also communicate with the server.

Where and why to use SVG :

• SVG stands for Scalable Vector Graphics.
• It is used to construct vector based graphics using a format that is similar to XML.
• Elements that we are created using SVG can be animated.
• These images are scalable.
• They are completely made up of XML.
• When we zoom a SVG image , its quality is never lost.
• It can also be resized without the lost in quality.
• We can change its resolutions according to our needs.
• It is mainly used for displaying graphics on web pages.
• We can modify a SVG using JavaScript and also other languages.
• Its size is very small compared to other graphics.
• It is useful in the creation of logos, because SVG graphics areclear and sharp at any size.