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AJAX Materials-Free Download





How Ajax objects can be created?

Following syntax can be used to create Ajax objects:

Var sample = New ajaxObject(‘path of the page’)

What are the protocols used by Ajax?

• HTTP’s GET or POST

• XMLHttpRequest for placing a request with the web server

• Uses JSON to communicate between the client and server

• UED or URL encoded data

What are all the security issues of Ajax?

Security issues that can be encountered

• When Ajax calls are sent through plain text and it may lead to know the database details

• Inserting scripts can also be possible and attackers can easily penetrate into the system

How can we handle concurrent requests?

Javascript functions should be written to handle concurrent requests and call back function can be passed as a parameter. Those parameters are passed to AjaxInteraction(URL, callback) object.

Define the role of the Update Panel?

Update Panel is used to add functionality to the existing ASP.NET applications. By using partial page rendering, it can be used to update the content. Refresh can be made for the partial page instead of whole page.

Can we use nested update panel in Ajax?

Yes, we can use nested update panel in Ajax. Update panels can be nested to have more control over the Page Refresh.

What are the types of post back in Ajax?

There are two types of post backs:

• Synchronous Postback

• Asynchronous Postback

How can we handle exception handling in Ajax?

ErrorTemplate which is the child tag of Script Manager is used to handle exception handling in Ajax.

What are the components of the ASP.NET Ajax Client Library?

Following components are used in Ajax client library:

• Component Layer

• Core Services Layer

• Browser Compatibility Layer

What are the controls of the Script Management group?

The controls of script Management group are:

• ScriptManager

• ScriptManagerProxy

4. What are all the different data types that JSON supports?

JSON supports following data types:

• String

• Number

• Boolean

• Array

• Object

• Null

What are the goals of Ajax?

The basic goals of ASP.NET Ajax are:

• Reduced web server hits

• Reduced Network load

• Interactive user interface

• Platform and architecture neutrality

• Support for both synchronous and asynchronous communication

• Provide a server- and client-side framework

What is the difference between proxied and proxyless calls in AJAX?

Proxied calls are made through stub objects which can be called from PHP classes on the JavaScript side in AJAX.

Proxyless calls are made using utility JavaScript functions like HTML_AJAX.replace() and HTML_AJAX.append() in AJAX.

How many types of ready states in Ajax?

There are four ready states in Ajax:

• Initialization

• Request

• Process

• Ready

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