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Jquery Interview Questions & Answers - Learning Mode
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Jquery Interview Questions & Answers - Learning Mode

jQuery is a fast and concise JavaScript Library created by John Resig in 2006 with a nice motto − Write less, do more. jQuery simplifies HTML document traversing, event handling, animating, and Ajax interactions for rapid web development. jQuery is a cross-platform JavaScript library designed to simplify the client-side scripting of HTML. jQuery is the most popular JavaScript library in use today, with installation on 65% of the top 10 million highest-trafficked sites on the Web.

Try Jquery Interview Questions & Answers - Exam Mode

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Jquery Interview Questions & Answers - Learning Mode
Try Jquery Interview Questions & Answers - Exam Mode
Question: What are the Advantages of jQuery?

Answer: The advantages of using jQuery are:

* JavaScript enhancement without the overhead of learning new syntax
* Ability to keep the code simple, clear, readable and reusable
* Eradication of the requirement of writing repetitious and complex loops and DOM scripting library calls Source: CoolInterview.com
Question: Explain the concepts of "$ function" in jQuery with an example?

Answer: The type of a function is "function".
There are a lot of anonymous functions is jquery.

$(document).ready(function() {});
$("a").click(function() {});

$.ajax({
url: "someurl.php",
success: function() {}
}); Source: CoolInterview.com
Question: Is it too early to discuss jQuery UI 1.8?

Answer: There?s a lot on our list for the year. Filament Group did a great job to start a list of all widgets they could imagine being part of jQuery UI, which can be found and discussed in the jQuery UI planning wiki at http://wiki.jqueryui.com. There?s no definite roadmap for 1.8 yet, but some components are likely to make it into the next release. For instance, widgets that are already being worked on (grid, menu), as well as widgets that we had to kick out of 1.6/1.7 because they weren?t stable enou Source: CoolInterview.com
Question: Different ways of using $.connect function in jQuery?

Answer: The syntax of connect function is
$.connect(sourceObj/*object*/, sourceFunc/*string*/, callObj/*object*/, callFunc/*string or Func*/)

sourceObj(optional) is the object of the source function to which we want to connect
sourceFunc is the function name to which we want to connect
callObj(optional) is the object which we want to use for the handler function
callFunc is the function that we want to execute when sourceFunc is executed.

Here sourceObj, callObj are optional fo Source: CoolInterview.com
Question: Mac, Windows or Linux? Why do you love this platform while using jQuery?

Answer: I switched to Mac hardware around a year ago and I?m totally in love with it. All components work together nicely, and so far, I never had to return my Macbook Pro to the Apple Store because of an issue. However, I?m still using Windows through Parallels because OSX, while visually nice and stable, has fundamental usability flaws.

One of these flaws is the Finder. I recently worked on the jQuery UI Selectables in the labs version, and once again saw that the Finder had great flaws when it Source: CoolInterview.com
Question: How to use jQuery.connect?

Answer: download jquery.connect.js file
include this file in your html file.
and use $.connect function to connect a function to another function. Source: CoolInterview.com
Question: Explain the features of jQuery?

Answer: Features of jQuery are :

* Effects and animations
* Ajax
* Extensibility
* DOM element selections functions
* Events
* CSS manipulation
* Utilities - such as browser version and the each function.
* JavaScript Plugins
* DOM traversal and modification Source: CoolInterview.com
Question: What would be new budding jQuery UI for developers?

Answer: For jQuery UI, we?re trying to take the same path than jQuery, and people that are restricted to thinking in classical OOP patterns will have a problem. If you think about it freely and give the functional, event-driven and progressive approach a try, you?ll find yourself getting the work done with jQuery UI in a fraction of the time needed than with other frameworks. Source: CoolInterview.com
Question: Mac, Windows or Linux? Which one is more compatible in jquery?

Answer: All components work together nicely, and so far, I never had to return my Macbook Pro to the Apple Store because of an issue. However, I?m still using Windows through Parallels because OSX, while visually nice and stable, has fundamental usability flaws.

One of these flaws is the Finder. I recently worked on the jQuery UI Selectables in the labs version, and once again saw that the Finder had great flaws when it comes down to selection. For instance, if you select multiple items and click Source: CoolInterview.com
Question: Explain how jQuery Works?

Answer: <html>
<head>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
// You can write the code here
</script>
</head>
<body>
<a href="http://www.globalguideline.com/">Global GuideLine</a>
</body>
</html> Source: CoolInterview.com
Question: With jQuery UI 1.7 being released in the last few days, what do you see as the key parts of jQuery UI 1.7? What are you most proud of out of that release?

Answer: The one thing I?m most proud of is that our framework has matured so much since 1.5. We have taken great care to unify our API, fix hundreds of compatibility and behavior issues, and now we truly have a foundation to build upon without needing to rewrite the core functionality again and again. This will allow us to push our features in the next releases in literally no time. Source: CoolInterview.com
Question: Can you give me a brief history of your programming days? Where did it all start?

Answer: Although it?s a bit embarrassing, my first programming experience was trying to build a customized and skinnable mediaplayer with Visual Basic 6. This probably was around 1999 or so, and although the media player was quite nice in terms of features, it had countless timers and totally killed every CPU by just playing a simple song.

After this experiment I soon realized that I wanted to do something with the internet. One of my hobbies was (and still is) japanese anime and manga, and there Source: CoolInterview.com
Question: How to use jQuery library in our ASP.Net project?

Answer: Download the latest jQuery library from jQuery.com and include the reference to the jQuery library file in our ASPX page.

<script src="_scripts/jQuery-1.2.6.js" type="text/javascript"></script>

<script language="javascript">

$(document).ready(function() {

alert('test');

});

</script> Source: CoolInterview.com
Question: Jumping off of jQuery UI for a second, Do you ?release early, release often? with all of your projects? What are your thoughts on that strategy?

Answer: Speaking for myself, I often release too early. That has been a problem in the past, when we released versions as stable that weren?t, for instance. So it?s important to find a combination of both - a stable release must be stable, while development cannot be halted or blocked through stubborn processes. A labs section is great in that way - it allows developers to contribute freely and plan on an open canvas, with early preview releases, and the work can later be merged back. Source: CoolInterview.com
Question: Why is jQuery better than JavaScript?

Answer: * jQuery is great library for developing ajax based application.
* It helps the programmers to keep code simple and concise and reusable.
* jQuery library simplifies the process of traversal of HTML DOM tree.
* jQuery can also handle events, perform animation, and add the Ajax support in web applications. Source: CoolInterview.com
Question: Have any of your startup projects failed dismally - if so, why and how did you learn from them?

Answer: A lot of my side projects failed, as a matter of fact, while others succeeded. Usually, the reason why some project fails is not a technical one, but the fact that one didn?t build meta data around it. That means a dedicated site, documentation, instructions. Source: CoolInterview.com
Question: And finally, If you could give one tip to any new budding jQuery UI developers, what would it be?

Answer: Think different. No, seriously. For jQuery UI, we?re trying to take the same path than jQuery, and people that are restricted to thinking in classical OOP patterns will have a problem. If you think about it freely and give the functional, event-driven and progressive approach a try, you?ll find yourself getting the work done with jQuery UI in a fraction of the time needed than with other frameworks. Source: CoolInterview.com
Question: How did you become the creator of jQuery UI? Whats the story behind that?

Answer: I initially came to the jQuery project while searching for a good solution to power the web applications of a big german client. As I was specifically responsible for building out a lot of the frontend logic and interaction, I quickly found out about Interface, a collection of interface plugins developed by Stefan Petre. I soon realized there was a lot of work involved to make it stable for our environment, so I invested a lot of time into bugfixes and feature stabilization, and later even plann Source: CoolInterview.com
Question: Back onto jQuery UI? Can you see jQuery UI making more of an impression in the future, lead by the current successes of jQuery?

Answer: This question is difficult to answer because jQuery, other than jQuery UI, can be useful almost everytime. jQuery UI gives you a specific set of user interface widgets and behaviours, and many people think of it as loosing a kind of freedom. On the other hand, there?s definitely some connection - if you?re using Prototype already, and you?re looking for an UI framework, your choice is most often script.aculo.us. If you?re using jQuery, why not use the official side project? Source: CoolInterview.com
Question: Whats next on the hitlist with jQuery UI?

Answer: There?s a lot of movement right now. We finally pushed out 1.7 3 days ago, which we believe is a solid foundation for everything that?s coming in in the next couple of months. While 1.7 was a stability and foundation release, the next releases will concentrate around features, so expect to see many more components soon. Some examples are the colorpicker, menu, grid, tooltip and tree widgets.

Additionally, my personal goal is to target more platforms, for example the iPhone. Early test imp Source: CoolInterview.com

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