AJAX, JSON and RESTFul WebServices

With Ajax, web applications can send and retrieve data from the server asynchronously without disturbing the existing page.

DESCRIPTION

Have you ever wondered why your subsequent web pages take too long for loading?

That is due to the absence of wow features offered by Ajax.

With Ajax, web applications can send and retrieve data from the server asynchronously without disturbing the existing page. By dissociating the data interchange layer from the presentation layer, Ajax allows for web pages to alter content dynamically without reloading the entire web page.

jquery

Being the most important feature of fertile web application development, Ajax brings web interfaces using XHTML and CSS up to desktop application interface standards without the interfaces having to rely on plugins such as Flash or Java. Ajax supports threading, which allows the engendering of new lines of logic, completely independent of those before, adjacent to or after it.

Since Ajax is constituted from three words namely Asynchronous, JavaScript and XML so, before you embark on the journey of learning these lessons make sure that you are through with each of the these terminologies and their implementation.

JSON

The JSON object contains methods for parsing JavaScript Object Notation and converting values to JSON. It is a language-independent data format which ensures easy availability of code for parsing data of different languages. Though JSON was originally believed to be a strict subset of JavaScript and ECMAScript, it unknowingly allows some unescaped characters in strings that are illegitimate in JavaScript and ECMAScript strings.

  • Number
    a signed decimal number that may contain a fractional part and may use Exponential E notation but cannot use non-numbers like NaN. Leading zeroes are prohibited(in JSON.stringtify zeroes will be ignored but in JSON.parse it will throw an error)
  • String
    a sequence of zero or more Unicode characters. Strings are demarcated with double-quotation marks and support a backlash escaping syntax. Only a limited number of characters can be escaped like the Unicode line separator and the paragraph separator.
  • Boolean
    takes only two values, either True or False
  • Array
    an ordered list of zero or more values, each of which may be of any type.
  • Object
    These are demarcated with curly brackets and use comma to separate each pair, while within each pair the colon ‘;’ character separates the key or name from its value. In both array and objects trailing commas are prohibited.

RESTful WEB SERVICES

Like NAME like FEATURES. More than ten years to its inception, REST continues to amuse its users through a wide range of services it offers. It is one of the most important technologies for web applications.

Through this course you will learn the basic features of this software and how to apply its architectural style for creating scalable web services. Representational Service Transfer (REST) specifies constraints such as the uniform interface that if applied to a web service stimulates properties like performance, scalability and modifiability. Following features enable REST to build lightweight applications:

  • Resource identification through URI
  • Uniform interface
  • Self-descriptive messages
  • Stateful interactions through hyperlinks.

CURRICULUM

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