Monthly Archives: August 2009

jQuery Tutorials ( Learn – Practice – Expert )

Article 1: Using jQuery With ASP.NET

This article has everything that is needed by programmer who want to start learning jQuery.

It includes the following topics:

  • Using jQuery in ASP.NET Page
  • jQuery Selectors
  • jQuery Chainability
  • jQuery Object Accessors
  • jQuery Events
  • Ajax using jQuery and ASP.NET
  • jQuery Ajax with JSON data
  • Effects with jQuery

Read Full Article: click here…

Article 2: Using jQuery to consume ASP.NET web services

First, It’ll cover the two requirements necessary when calling an ASMX web service that’s being JSON serialized by the ASP.NET AJAX extensions.
Then, It’ll show you how to do this with jQuery.
Finally, I’ll update the deferred content loading example accordingly.

Read Full Article: click here



Article 3: ON Hijacking and How ASP.NET AJAX 1.0 Avoids these Attacks

Recently some reports have been issued by security researchers describing ways hackers can use the JSON wire format used by most popular AJAX frameworks to try and exploit cross domain scripts within browsers.  Specifically, these attacks use HTTP GET requests invoked via an HTML <script src=""> include element to circumvent the "same origin policy" enforced by browsers (which limits JavaScript objects like XmlHttpRequest to only calling URLs on the same domain that the page was loaded from), and then look for ways to exploit the JSON payload content.

Read Full article: click here

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How to Programmatically detect Silverlight version?

Two questions that often arise when building Silverlight based websites are:

A. How do I detect if Silverlight is installed on a visitor’s browser?

B. How do I detect what version of Silverlight is installed on a visitor’s browser?

The answer to A is relatively simple since Silverlight.js (the standard Silverlight javaScript include file) contains a function that we can use. The function is called isInstalled and it returns true/false. You can use it the following way to detect if there is any Silverlight version installed:

<script src="Silverlight.js" type="text/javascript"></script>

var isSLInstalled = Silverlight.isInstalled(null)

The answer to B is a little more complex since for some reason there is no direct way to get Silverlight’s version number. Basically the only documented way to answer this question is to repeatedly call isInstalled with different version numbers until you get the right version.

Example:

Silverlight.isInstalled(’3.0′)

Silverlight.isInstalled(’2.0′)

Silverlight.isInstalled(’1.0′)

Read Full article: click here

Related useful post: How to add Silverlight version detection to Google Analytics ??

JSON.Net

The Json.NET library makes working with JavaScript and JSON formatted data in .NET simple. Quickly read and write JSON using the JsonReader and JsonWriter or serialize your .NET objects with a single method call using the JsonSerializer.

Features

  • LINQ to JSON
  • The JsonSerializer for quickly converting your .NET objects to JSON and back again
  • Json.NET can optionally produce well formatted, indented JSON for debugging or display
  • Attributes like JsonIgnore and JsonProperty can be added to a class to customize how a class is serialized
  • Ability to convert JSON to and from XML
  • Supports multiple platforms: .NET, Silverlight and the Compact Framework

The JSON serializer is a good choice when the JSON you are reading or writing maps closely to a .NET class. The serializer automatically reads and writes JSON for the class.

For situations where you are only interested in getting values from JSON, don’t have a class to serialize or deserialize to, or the JSON is radically different from your class and you need to manually read and write from your objects then LINQ to JSON is what you should use. LINQ to JSON allows you to easily read, create and modify JSON in .NET.

Json.NET CodePlex Project

Json.NET Download