Ajax Interview Questions, Ajax Interview Questions and Answers

Ajax Interview Questions and Answers, Ajax Interview Questions and Answers Freshers, Ajax Interview Questions and Answers, Ajax Interview Questions

Before getting on to the Ajax interview questions, the student must know that the Ajax is a continuously varying field which needs the students as well as professionals to upgrade their skills with the new features and knowledge, to get fit for the jobs associated with Ajax. This post related to Ajax Interview Questions and Answers, Ajax Interview Questions and Answers Freshers, Ajax Interview Questions and Answers, Ajax Interview Questions will help you let out find all the solutions that are frequently asked in you upcoming Ajax interview.

Over thousands of vacancies available for the Ajax developers, experts must be acquaintance with all the component of Ajax technologies. This is necessary for the students in order to have in-depth knowledge of the subject so that they can have best employment opportunities in the future. Knowing every little detail about Ajax is the best approach to solve the problems linked with problem.

APTRON has spent hours and hours in researching about the Ajax Interview Questions and Answers, Ajax Interview Questions and Answers Freshers, Ajax Interview Questions and Answers, Ajax Interview Questions that you might encounter in your upcoming interview.  All these questions will alone help you to crack the interview and make you the best among all your competitors.

First of all, let us tell you about how the Ajax technology is evolving in today’s world and how demanding it is in the upcoming years. In fact, according to one study, most of the companies and businesses have moved to the Ajax. Now, you cannot predict how huge the future is going to be for the people experienced in the related technologies.

Hence, if you are looking for boosting up your profile and securing your future, Ajax will help you in reaching the zenith of your career. Apart from this, you would also have a lot of opportunities as a fresher.

These questions alone are omnipotent. Read and re-read the questions and their solutions to get accustomed to what you will be asked in the interview. These Ajax interview questions and answers will also help you on your way to mastering the skills and will take you to the giant world where worldwide and local businesses, huge or medium, are picking up the best and quality Ajax professionals.

This ultimate list of best Ajax interview questions will ride you through the quick knowledge of the subject and topics like Visual studio, Overview of C#, Developing an application using Ajax and MySQL. This Ajax interview questions and answers can be your next gateway to your next job as a Ajax expert.

These are very Basic Ajax Interview Questions and Answers for freshers and experienced bot

Q1: What is Ajax?
A1: 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.

Q2: What are Ajax applications?
A2: Browser based applications and platform independent applications are used by Ajax.

Q3: What is the name of the DLL that contains Ajax control tool kit?
A3: 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.

Q4: What role of #&& in querystring?
A4: # is treated as fragment delimiter to delimit the history state and && precedes is used to check on the information in the query string.

Q5: What is update panel?
A5: Update panel  is a server control used to update the specified portion of a web page. Script Manager needs to be used whenever update panel is used. Using update panel, user cannot handle outside controls.

Q6: What are all the technologies used by Ajax?
A6: AJAX uses following technologies:

• JavaScript
• XMLHttpRequest
• Document Object Model (DOM)
• Extensible HTML (XHTML)
• Cascading Style Sheets (CSS)

Q7: What is JSON in Ajax?
A7: 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.

Q8: What are the components of the ASP.NET AJAX architecture?
A8: There are two components of AJAX Architecture:

• AJAX client architecture
• AJAX server architecture

Q9: Where AJAX cannot be used?
A9: 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

Q10: Which are limitations of AJAX?
A10: – Back functionality can’t work because the dynamic pages won’t register themselves to the browsers cache. Hence the use Iframe will become required.
– The page cannot be bookmarked if it is developed using Ajax.
– If java script is not enabled, Ajax will stop working.
– Because different components of the pages are loaded at different times, response time may be slow.
– Because different components of the pages are loaded at different times it may create confusion for the user.

Q11: Why do we use the XMLHttpRequest object in AJAX?
A11: – Javascript uses the XMLHttpRequest object to manipulate XML and other text data between client and server.
– AJAX applications use the XMLHttpRequest object to avoid the postback of entire page when the browser is communicating with server.
– The XMLHttpRequest object enables a client-side script to execute an HTTP request.
– For this functionality MSXML ActiveX component is used in earlier version of Internet Explorer. While, XMLHttpRequest is used in Internet Explorer 7 and other browsers, such as Mozilla, Firefox.

Q12: What are the new features of ASP.NET AJAX 4.0?
A12: These features are as follows:

– It enables the application to bind the live data.
– It enables to render the client-side template.
– It enables declarative instantiation of client components.
– It provides observer pattern on JavaScript objects and arrays.
– It provides the facility to invoke ADO.NET data services and data contexts.
– It supports for the DataView control.

Q13: What are the differences between AJAX and JavaScript?
A13: The differences between AJAX and JavaScript are given as follows:

– AJAX sends request to the server and will not wait for the response.
– It will allow other operations on the page before it get response of previous request; whereas, JavaScript make a request to the server, will waits for response and will not allow other operation on the page during that time.
– In AJAX, the page will not get refreshed for downloading the whole page while JavaScript manages and controls a Web page after being downloaded.
– By using AJAX we can minimize the overload on the server because the script needs to request once while JavaScript posts the request that updates the script each time.

Q14: Describe the AccordionExtender control.
A14: – The AccordionExtender control is almost same as the CollapsiblePanelExtender control.

– It enables the grouping of multiple collapsible panels in a single control.
– It also manages the collapsed and expanded state of every panel and one panel will expand at a time.
– Using AccordionExtender control we can’t expand two or more panels at a time.

However, we can click the header templates of particular panel to display the hidden contents.

By default, one panel is always expanded in theAccordionExtender.

Q15: Describe the formats and protocols used by AJAX
A15: – The client web page is creates the XmlHttpRequest, and thus the connection from the web page to an application on the server.

– Part of that connection determines how the response can be produced to the client code – via the use of a “callback” routine.
– The callback routine is called multiple times which come with a status code which indicates the reason for the invocation.
– When a request can be successfully completed by the server application, a response should also be produced.

Q16: What are Difference between Server-Side AJAX framework and Client-side AJAX framework?
A16: – The server-side framework facilitates the developers to develop Ajax functionality, without gaining much knowledge of JavaScript.

– This framework supports server controls and components as well as the drag and drop features.
– This framework is usually preferred when you required to rapidly ajaxify an asp.net web page. The drawback is that a round trip will take place to the server to execute a client-side action.
– The Client-Side Framework allows you to build web applications with rich user-interactivity as that of a desktop application.
– It includes a set of JavaScript libraries, which is not dependent from ASP.NET. The functionalities of this library are enhanced in every release.

Q17: Define JSON?
A17: JSON is JavaScript Object Notation.

Q18: Describe how to handle concurrent AJAX requests?
A18: JavaScipt Closures can be used for handling concurrent requests.

Q19: How do you know that an AJAX request has completed?
A19: If readyState’s value is 4 means its completed.

Q20: How we can send data to server using Ajax?
A20: We can use GET OR POST Method to send data.

Q21: What Browsers support Ajax?
A21: Today, All the Browser support ajax. Following are minium version of browser which support Ajax.

• Internet Explorer 5.0 and up,
• Opera 7.6 and up,
• Netscape 7.1 and up,
• Firefox 1.0 and up,
• Safari 1.2 and up,

Q22: Should I consider AJAX?
A22: AJAX definitely has the buzz right now, but it might not be the right thing for you. AJAX is limited to the latest browsers, exposes browser compatibility issues, and requires new skill-sets for many. There is a good blog entry by Alex Bosworth on AJAX Mistakes which is a good read before you jump full force into AJAX.

On the other hand you can achieve highly interactive rich web applications that are responsive and appear really fast. While it is debatable as to whether an AJAX based application is really faster, the user feels a sense of immediacy because they are given active feedback while data is exchanged in the background. If you are an early adopter and can handle the browser compatibility issues, and are willing to learn some more skills, then AJAX is for you. It may be prudent to start off AJAX-ifying a small portion or component of your application first. We all love technology, but just remember the purpose of AJAX is to enhance your user’s experience and not hinder it.

Q23: What is the minimum version of PHP that needs to be running in order to use HTML_AJAX?
A23: The oldest PHP version i’ve fully tested HTML_AJAX is 4.3.11, but it should run on 4.2.0 without any problems. (Testing reports from PHP versions older then 4.3.11 would be appreciated.)

Q24: Describe the formats and protocols used by AJAX.
A24: Ajax uses HTTP’s GET or POST. AJAX also uses XMLHttpRequest protocol for requesting to the web server.
AJAX uses JSON format to communicate between client and server. UED or URL encoded data formats can also be used.

Q25: What is the disadvantage of AJAX?
A25: The disadvantages of AJAX are:

• Search engines would not be able to index an AJAX application.
• The server information can not be accessed within AJAX.
• AJAX is not well integrated with any browser.
• ActiveX requests are enabled only in IE 5 and IE6
• Data of all requests is URL-encoded, which increases the size of the request.

Q26: What are different readyState in Ajax.
A26: There are total 5 ready state in Ajax:

Q27: How to cancel the current request in Ajax?
A27: Current request in AJAX is cancelled when the user performs an action which sets of an Ajax request. This can be depicted with the help of auto-complete functionality for a search box where users can be helped with related search terms based on their current input, by making an AJAX request each time they pass a key in search field. The user types faster than the Ajax request and you would want to abort any non-finished requests, before starting the next one.

Q28: Explain Fetch API in JavaScript.
A28: Fetch API uses to request and response objects that can be used in future whenever needed. It provides an interface for fetching resources. Fetch API uses promises that enable cleaner API. Cache API or other similar things handles the request and responses that might require you to generate your own responses programmatically.

Thus, you can now crack your interview and work as a developer in one of your dream companies by preparing from these set of question and answers to be technically sound.

Q29: Explain what is polling in AJAX.
A29: The Process of retrieving data from a server to obtain near-live data regularly is called AJAX polling.

Ajax Conclusion Interview FAQs

We know the list of Ajax Interview Questions and Answers, Ajax Interview Questions and Answers Freshers, Ajax Interview Questions and Answers, Ajax Interview Questions is overwhelming but the advantages of reading all the questions will maximize your potential and help you crack the interview. The surprising fact is that this Ajax interview questions and answers post covers all the basic of the Ajax technology and you have to check out the FAQs of different components of Ajax too.

However, you will be asked with the questions in the interview related to the above mentioned questions. Preparing and understanding all the concept of Ajax technology will help you strengthen the other little information around the topic.

After preparing these interview questions, we recommend you to go for a mock interview before facing the real one. You can take the help of your friend or a Ajax expert to find the loop holes in your skills and knowledge. Moreover, this will also allow you in practicing and improving the communication skill which plays a vital role in getting placed and grabbing high salaries.

Remember, in the interview, the company or the business or you can say the examiner often checks your basic knowledge of the subject. If your basics is covered and strengthened, you can have the job of your dream. The industry experts understand that if the foundation of the student is already made up, it is easy for the company to educate the employ towards advance skills. If there are no basics, there is no meaning of having learnt the subject.

Therefore, it’s never too late to edge all the basics of any technology. If you think that you’ve not acquired the enough skills, you can join our upcoming batch of Ajax Training in Noida. We are one of the best institute for Ajax in noida which provide advance learning in the field of Ajax Course. We’ve highly qualified professionals working with us and promise top quality education to the students.

We hope that you enjoyed reading Ajax Interview Questions and Answers, Ajax Interview Questions and Answers Freshers, Ajax Interview Questions and Answers, Ajax Interview Questions and all the FAQs associated with the interview. Do not forget to revise all the Ajax interview questions and answers before going for the Ajax interview. In addition to this, if you’ve any doubt or query associated with Ajax, you can contact us anytime. We will be happy to help you out at our earliest convenience. At last, we wish you all the best for your upcoming interview on Ajax Technology.