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AJAX Interview Questions & Answers - Learning Mode
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AJAX Interview Questions & Answers - Learning Mode

Ajax is a client-side script that communicates to and from a server/database without the need for a postback or a complete page refresh. The best definition I've read for Ajax is ?the method of exchanging data with a server, and updating parts of a web page - without reloading the entire page.? AJAX is a misleading name. You don't have to understand XML to use AJAX. AJAX is a technique for creating fast and dynamic web pages. AJAX allows web pages to be updated asynchronously by exchanging small amounts of data with the server behind the scenes.

Try AJAX Interview Questions & Answers - Exam Mode

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AJAX Interview Questions & Answers - Learning Mode
Try AJAX Interview Questions & Answers - Exam Mode
Question: Question :: What is Dojo?

Answer: Dojo is a third-party javascript toolkit for creating rich featured applications. Dojo is an Open Source DHTML toolkit written in JavaScript. It builds on several contributed code bases (nWidgets, Burstlib, f(m)), which is why we refer to it sometimes as a "unified" toolkit. Dojo aims to solve some long-standing historical problems with DHTML which prevented mass adoption of dynamic web application development. Source: CoolInterview.com
Question: Should I use XML or text, JavaScript, or HTML as a return type?

Answer: It depends. Clearly the 'X' in AJAX stands for XML, but several AJAX proponents are quick to point out that nothing in AJAX, per se, precludes using other types of payload, such as, JavaScript, HTML, or plain text.

* XML - Web Services and AJAX seem made for one another. You can use client-side API's for downloading and parsing the XML content from RESTful Web Services. (However be mindful with some SOAP based Web Services architectures the payloads can get quite large and com Source: CoolInterview.com
Question: Question :: Can we override the EnablePartialRendering property of the ScriptManager class?

Answer: Yes. But this has to be done before the init event of the page (or during runtime after the page has already loaded). Otherwise an InvalidOperationException will be thrown. Source: CoolInterview.com
Question: Question :: How to handle multiple or concurrent requests in Ajax?


Answer: For concurrent requests, declare separate XmlHttpRequest objects for each request. For example, for request to get data from an SQL table1, use something like this...
xmlHttpObject1.Onreadystatechange = functionfromTable1();
and to get data from another table (say table2) at the same time, use
xmlHttpObject2.Onreadystatechange = functionfromTable2();
Ofcourse, the XmlHttpObject needs to be opened & parameters passed too, like as shown below...
xmlHTTPObject1.open("GET","http://"lo Source: CoolInterview.com
Question: Question :: How to control how long an Ajax request may last?


Answer: Use the ScriptManager's AsyncPostBackTimeout Property. For example, if you want to debug a web page but you get an error that the page request has timed out, you may set where the value specified is in seconds.
Source: CoolInterview.com
Question: Whats with the -alpha in the install instructions?

Answer: HTML_AJAX hasn't had a stable release yet and the pear installer doesn't install non stable packages by default unless you specify a version. Source: CoolInterview.com
Question: Is Ajax just another name for XMLHttpRequest?

Answer: No. XMLHttpRequest is only part of the Ajax equation. XMLHttpRequest is the technical component that makes the asynchronous server communication possible; Ajax is our name for the overall approach described in the article, which relies not only on XMLHttpRequest, but on CSS, DOM, and other technologies. Source: CoolInterview.com
Question: What JavaScript libraries and frameworks are available for AJAX support?

Answer: There are many libraries/frameworks out there (and many more emerging) that will help abstract such things as all the nasty browser differences. Three good libraries are The Dojo Toolkit, Prototype, and DWR.

* The Dojo Toolkit contains APIs and widgets to support the development of rich web applications. Dojo contains an intelligent packaging system, UI effects, drag and drop APIs, widget APIs, event abstraction, client storage APIs, and AJAX interaction APIs. Dojo solves common usability Source: CoolInterview.com
Question: How do I submit a form or a part of a form without a page refresh?

Answer: When creating a form make sure that the "form" element "onSubmit" attribute is set to a JavaScript function that returns false.
<form onSubmit="doAJAXSubmit();return false;" >
<input type="text" id="tf1" />
<input type="submit" id="submit1" value="Update"/>
</>

You can also submit data by associating a function with a form button in a similar way.

<form onSubmit="doAJAXSubmit();return false;" >
<input type="text" id="tf1" />
< Source: CoolInterview.com
Question: Does Java have support for Comet style server-side push?

Answer: Current AJAX applications use polling to communicate changes data between the server and client. Some applications, such as chat applications, stock tickers, or score boards require more immediate notifications of updates to the client. Comet is an event based low latency server side push for AJAX applications. Comet communication keeps one of the two connections available to the browser open to continously communicate events from the server to the client. A Java based solution for Comet is bein Source: CoolInterview.com
Question: Should I use an HTTP GET or POST for my AJAX calls?

Answer: AJAX requests should use an HTTP GET request when retrieving data where the data will not change for a given request URL. An HTTP POST should be used when state is updated on the server. This is in line with HTTP idempotency recommendations and is highly recommended for a consistent web application architecture. Source: CoolInterview.com
Question: Should I consider AJAX?

Answer: 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 applica Source: CoolInterview.com
Question: Is Adaptive Path selling Ajax components or trademarking the name? Where can I download it?

Answer: Ajax isn?t something you can download. It?s an approach ? a way of thinking about the architecture of web applications using certain technologies. Neither the Ajax name nor the approach are proprietary to Adaptive Path. Source: CoolInterview.com
Question: Explain about direct ajax frameworks?

Answer: Direct ajax frameworks require CSS, HTML and ajax expertise. Authoring should be done in HTML and framework directly deals with HTML elements. Many of the frameworks and API`s are provided are many purposes such as commonly including functions (COM), event handling, DOM, and altering graphic rich elements. These frameworks are used for shopping frameworks but not for web based applications. Source: CoolInterview.com
Question: How do I provide internationalized AJAX interactions?


Answer: Just because you are using XML does not mean you can properly send and receive localized content using AJAX requests. To provide internationalized AJAX components you need to do the following:

* Set the charset of the page to an encoding that is supported by your target languages. I tend to use UTF-8 because it covers the most languages. The following meta declaration in a HTML/JSP page will set the content type:

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" Source: CoolInterview.com
Question: Is the XMLHttpRequest object part of a W3C standard?

Answer: No. Or not yet. It is part of the DOM Level 3 Load and Save Specification proposal. Source: CoolInterview.com
Question: Is it possible to set session variables from JavaScript?

Answer: It's not possible to set any session variables directly from JavaScript as it is purely a client side technology. You can use AJAX though to asyncronously... Source: CoolInterview.com
Question: Do Ajax applications always deliver a better experience than traditional web applications?

Answer: Not necessarily. Ajax gives interaction designers more flexibility. However, the more power we have, the more caution we must use in exercising it. We must be careful to use Ajax to enhance the user experience of our applications, not degrade it. Source: CoolInterview.com
Question: Explain about the readystate property?

Answer: Readystate property holds the response of the server to the query generated from the client side. Each time the readystate property changes onreadystatechange function will be executed. Some of the values for the readystate property are as follows if the status is zero the request is not initialized, 1 the request has been set up, 2 the request has been sent, 3 the request is in process, 4 the request is complete. Source: CoolInterview.com
Question: Question :: What kinds of applications is Ajax best suited for?

Answer: We don?t know yet. Because this is a relatively new approach, our understanding of where Ajax can best be applied is still in its infancy. Sometimes the traditional web application model is the most appropriate solution to a problem. Source: CoolInterview.com

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