Interview Questions Ajax


1. What is Ajax?
Ajax is abbreviated as Asynchronous Javascript and XML. It is new technique used to create better, faster and more interactive web systems or applications. Ajax uses asynchronous data transfer between the Browser and the web server.
This technique is used to make internet faster and user friendly. It is not a programming language.

2. What are Ajax applications?
Browser based applications and platform independent applications are used by Ajax.

3. Does AJAX work with Java?
Absolutely. Java is a great fit for AJAX! You can use Java Enterprise Edition servers to generate AJAX client pages and to serve incoming AJAX requests, manage server side state for AJAX clients, and connect AJAX clients to your enterprise resources. The JavaServer Faces component model is a great fit for defining and using AJAX components.

4. What are all the controls of Ajax?
Following are the controls of Ajax:

5. What is the name of the DLL that contains Ajax control tool kit?
Ajaxcontroltoolkit.dll is the DLL used for Ajax control tool kit and it can be downloaded from the internet. It can be added in the tool box or copied directly in the bin folder.

6. What role of #&& in querystring?
# is treated as fragment delimiter to delimit the history state and && precedes is used to check on the information in the query string.

7. How to control the duration of an Ajax request?
AsyncPostBackTimeout property is used to control the duration of Ajax request. Deafult value of this property is 90 seconds.
Example ?
<asp:ScriptManager runat=?server? id=?sample? AsyncPostBackTimeout=?40?/>

8. Are there any frameworks available to help speedup development with AJAX?
There are several browser-side frameworks available, each with their own uniqueness?

9. What are the advantages of Ajax?
Following are the advantages of Ajax:
Bandwidth utilization ? It saves memory when the data is fetched from the same page.
More interactive
Speeder retrieval of data

10. What are the disadvantages of Ajax?
Following are the disadvantages of Ajax:
AJAX is dependent on Javascript. If there is some Javascript problem with the browser or in the OS, Ajax will not support
Ajax can be problematic in Search engines as it uses Javascript for most of its parts.
Source code written in AJAX is easily human readable. There will be some security issues in Ajax.
Debugging is difficult
Increases size of the requests
Slow and unreliable network connection.
Problem with browser back button when using AJAX enabled pages.