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 is AJAX event?
Ajax requests produce a wide variety of distinctive occasions that you can subscribe to. Here’s a full listing of the activities and in what order they are triggered.
There are 2 types of events in Ajax
Local Events: Local Events are callbacks that you can subscribe to inside the Ajax request object.
Global Events: Global events are triggered on the document, calling any handlers who may be listening.
Example of Local Events:
$.ajax({
beforeSend: function(){
},
complete: function(){
}
});
Example of Global Events:
$.ajax({
url: "bestinterviewquestion.html",
global: false,
}); 3. How many types of triggers are present in update panel?
There are two types of triggers used in update panel:
PostBackTrigger – This works as full postback and it cannot work asynchronously
AsyncPostBackTrigger – Partial post back asynchronously
4. What are all the controls of Ajax?
Following are the controls of Ajax:
ScriptManager
ScriptManagerProxy
UpdatePanel
UpdateProgress
Timer
5. How can I improve my Ajax performance?
To improve AJAX call performance, follow these steps:
Reduce the AJAX request numbers.
Wisely elect the event on which AJAX request triggers.
Appropriately use GET requests.
Reduce the amount of data transmitted.
Secure data using Caching.
6. Explain the types of active states in Ajax?
There are five types of active states available in AJAX. Here are those:
request not initialized – ready state 0
server connection established – ready state 1
request received – ready state 2
processing request – ready state 3
request finished, and the response is ready – ready state 4
7. 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.
8. 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.
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.
11. What is JSON in Ajax?
JSON is abbreviated as JavaScript Object Notation.
JSON is a safe and reliable data interchange format in JavaScript, which is easy to understand for both users and machines.
12. Where AJAX cannot be used?
Users cannot use AJAX if
If Page need to show in a search engine
If browser does not support JavaScript
If user wants to create secure application
13. How can AJAX applications be debugged?
Two tools are used for debugging:
Fiddler for IE
Firebug for Mozilla.
14. 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
15. 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
16. What is the difference between RegisterClientScriptBlock, RegisterClientScriptInclude and RegisterClientScriptResource?
Following are the functions:
RegisterClientScriptBlock – The script is specified as a string parameter.
RegisterClientScriptInclude – By setting the source attribute to a URL that point to a script file.
RegisterClientScriptResource – specifies Resource name in an assembly. The source attribute is automatically populated with a URL by a call to an HTTP handler that retrieves the named script from the assembly.
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