WHAT IS AJAX

AJAX  means Asynchronous JavaScript and XML, Ajax is a web development technique used for creating interactive web applications. It is a new way to use existing standards. Ajax is a cross-platform technique that can be used on a variety of  operating systems, computer architectures, and Web browsers due to  its JavaScript and XML foundation.

Ajax exchanges data with a server, and updates parts of a web page – without reloading the whole page. It uses both client-side scripting and server-side scripting. Ajax is a group of technologies, using  HTML and CSS technologies to mark up and style information. JavaScript  is used to display and allow the user to interact with the information presented. The combination of JavaScript and the XMLHttpRequest object offer a way for exchanging data asynchronously between browser and server to avoid full page reloads.

The main goal of this technique is exchanging small amounts of data with the server behind the scenes. Web pages become more responsive  because the  user does not need to reload the whole page each time a change is necessary. This inlarges the web page’s interactivity, speed, functionality, and usability greatly.

Ajax is used to create interactive web applications. With web data management tools you can optimize your development process easily.

Client Side and Server Side technologies

Client-side technology means that it is operated by the client in a client server relationship in a computer network.

A computer application (a web browser) is a client program that runs on a local computer and connects to a server. Operations may be performed client-side because they require the access to information or functionality is available on the client but not on the server.  The user performs the operations without sending data over the network; it is not so time consuming and risky than performed on the server.

Modern web browsers can request and receive data using HTTP (HyperText Transfer Protocol) and FTP (File Transfer Protocol) protocols. Users can choose a number of client programs or write their own server, client, and communication protocol, which can be used only together.

Such client-side programming as Javascript can be used to run checks on form values and send warnings to the user’s browser. The disadvantage of client-side technologies is the limit of control and operating systems as well as web browsers problems.

Programs that do not send or receive data over a network are not clients, and so the operations of such programs are not client-side operations.

Server-side operations are performed by the server in relationship with client in a computer networking. Server-side technologies perform operations of processing and storage of data from a client to a server, which can be viewed by a group of clients.

A server is a software program (a web server), for a distant server, that local computers can reach for different purposes.  In this case local computer demands access to information or functionality on the server to perform operations.

Client-side programming on the client computer has some advantages such as fewer security risks. Still server-side programming is more secure and is preferred by most programmers. Server-side programming offer more possibilities for languages than client-side.

Ajax is a good example of technology that uses both client-side scripting and server-side scripting. Ajax acts like a client-side script that calls a server-side script. This is a new and worth trying technology that will save you time and efforts.

 

 

More about CSS Technology

Cascading Style Sheets technology gives Web site developers and users more control over how pages are displayed. Designers and users with CSS can create style sheets that define how different elements, such as headers and links, appear. These style sheets can be applied to any Web page.

The term cascading means that multiple style sheets can be applied to the same Web page.

CSS is made to separate document content (usually written in HTML language) from document presentation, (layout, colors, and fonts). This enlarges content accessibility and allows better control in the specification of presentation characteristics, lessens complexity and repetition in the structural content. CSS technology offers possibility to the same markup page to be presented in different styles for different rendering ways, (it can be presented on-screen, in print, by voice).

CSS specifies cascade priorities or weights are calculated and assigned to rules, so that the results are predictable.

Every style sheet contains a list of rules. Each rule consists of selectors and a declaration block. Selectors are used to declare which of the markup elements a style matches to; they apply to all elements of a specific type, or only those elements that match a certain attribute.

3Core Building Web Pages Technologies: HTML and CSS

HTML and CSS are the Hypertext Markup Language and Cascading Style Sheets – two main technologies for constructing Web pages. HTML makes the page structure; CSS makes an arrangement of visual and aural parts for a variety of devices. HTML and CSS can be called the main principles of constructing Web pages and Web applications.

In more details HTML provides us with such features as:

1.     Possibility to publish online documents with headings, texts, tables, lists, photos, and videos.

2.     You can get online data through hypertext links.

3.     The use of design forms for conducting transactions with remote services makes it easy to search necessary things online, order products, etc.

4.     HTML also adds video clips, sound clips, and other applications directly in the documents.

CSS technology- Cascading Style Sheets is used to describe the presentation of Web pages –colors and layout. CSS technology transforms screen sizes and other features for the presentation to different types of devices. HTML and CSS can be used separately it is called the separation of structure (content) from presentation.

Japan’s nuclear crisis: when it will end?

Prime Minister of Japan Naoto Kan says in the Friday interview that Japan government is doing everything to stop the situation on Fukushima nuclear power plant from getting worse.

He does not say the main thing expected- that the nuclear crisis will be soon brought under control. The prime minister also comments on the government actions after the earthquake and tsunami in northeastern Japan, he points out that the situation with nuclear crisis is the most important problem to solve at the moment and the government is now concerned about it.

Naoto Kan  in a televised news conference tries to make clear that Japan gives full attention  at the first place to Fukushima nuclear situation and secondly, to reconstruction after disastrous calamity .

The situation at the nuclear plant according to Naoto Kan is serious. The radiation leaks and other serious problems still exist and are potential risks for the residents. He expresses sympathy to farmers and business owners and regrets about the damage caused to Fukushima residents.

Main Things about WWW

The World Wide WebWWW is a vast extensive information system that connects related sites and documents which can be accessed by the Internet.Do not misuse WWW with the Internet itself.

The Web is ubiquitous, it is everywhere and it became a great part of our life influencing on every aspect of it.

Practically all nowadays have heard about such social networking websites as MySpace and Facebook or viewing video website YouTube, they form a new concept of user-submitted content in major events.

Recently the World Wide Web has become easier to search in, got a high level of usability.  It is characterized by such things as well organization and no difficulty in usage, which causes rapid period of popularization.

This site is devoted to WWW and all the related things. The site will offer you most interesting news, opinions, facts and reviews on different themes.