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jQuery Interview Questions and Answers

Ques 1. What is jQuery?

Ans. jQuery is a light weight JavaScript library which provides fast and easy way of HTML DOM traversing and manipulation,its event handling,its client side animations, etc. One of the greatest features of jQuery is that jQuery supports an efficient way to implement AJAX applications because of its light weight nature and make normalize and efficient web programs.

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Ques 2. How to use jQuery?
Ans. jQuery can be easily used with other libraries so it should work out of the box with simple and complex JavaScript and Ajax.
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Ques 3. How to use jQuery library in our ASP.Net project?
Ans. 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>
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Ques 4. Can you give me a brief history of your programming days? Where did it all start?
Ans. 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 wasn't really a great community around it in germany at that time, so I took the challenge and created a community called Anime-Domain as my first big web project. It was my little playground, and after 10 revisions and designs it grew so popular that it was featured in german print magazines and had some 10k unique visitors a day. This was the time where I knew that by doing web development, you could reach many people very quickly with what you do, so I decided to continue to go that route.
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Ques 5. How did you become the creator of jQuery UI? Whats the story behind that?
Ans. 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 planned the next generation of Interface, Interface 2 with Stefan. However, it was then that Stefan moved on with founding his own business and ran out of time, so Interface was discontinued.

I would build the first version of an official jQuery interface addition, since I already had quite some experience from working on Interface. He and the jQuery community wanted to have it done in three months for the Ajax Experience conference in Boston, which was nearly impossible after a quick analysis of my workload. I had a day job, and I estimated I would need to work on it 3-4 hours everyday. After some days of consideration, I finally said 'yes', and for a three month period woke up every day at 6am to work for 3 hours on jQuery UI and then go to my day job. Now I can say that it was worth it.
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