JQuery is Java Script library or Java Script Framework which helps in how to traverse HTML documents, do some cool animations, and add Ajax interaction to any web page. It mainly helps programmer to reduce lines of code as huge code written in Java Script, can be done easily with JQuery in few lines.
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Dollar Sign is nothing but it's an alias for JQuery. Take a look at below jQuery code
$(document).ready(function(){
});
Over here $ sign can be replaced with " jQuery " keyword.
jQuery(document).ready(function(){
});
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Document.ready() function is different from body onload() function because off 2 reasons.
1. We can have more than one document.ready() function in a page where we can have only one onload function.
2. Document.ready() function is called as soon as DOM is loaded where body.onload() function is called when everything gets loaded on the page that includes DOM, images and all associated resources of the page.
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It's really simple. One just need to add reference of javascript file(.js). Go to Jquery.com and download the latest version of jQuery. When download is completed, there is a "jQuery-1.3.2.js" in the folder. Include this file
<script src="_scripts/jQuery-1.3.2.js" type="text/javascript"></script>
and you good to go now for JQuery.
Note : 1.3.2 denotes the library version.. It can be vary depending upon the version of Jquery you download.
Click below link to get mostly asked jQuery interview question.
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JQuery UI is a library which is built on top of JQuery library. JQuery UI comes with cool widgets, effects and interaction mechanism.
See below page on this site. Date Picker control used in this page to select date is an example of JQuery UI.
http://www.dotnetfunda.com/misc/topperformers.aspx
Click below link to get mostly asked jQuery interview question.
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Features of Jquery
1. One can easily provide effects and can do animations.
2. Applying / Changing CSS.
3. Cool plugins.
4. Ajax support
5. DOM selection events
6. Event Handling
Click below link to get mostly asked jQuery interview question.
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Some of the common methods are :
1. Show()
2. Hide()
3. Toggle()
4. FadeIn()
5. FadeOut()
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NOTE: This is objective type question, Please click question title for correct answer. |
There are 3 types of selectors in Jquery
1. CSS Selector
2. XPath Selector
3. Custom Selector
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There are many advantages with JQuery. Some of them are :
. It is more like a JavaScript enhancement so there is no overhead in learning a new syntax.
. It has the ability to keep the code simple, readable, clear and reusable.
. It would eradicate the requirement for writing complex loops and DOM scripting library calls. |
To select all elements in a page, we can use all selectors, for that we need to use *(asterisk symbol).
<script language="javascript" type="text/javascript">
$("*").css("border", "2px dotted red");
</script>
The above code will select all elements of the web page and apply border width as 2 pixel, style as dotted and color as red.
Thanks and Regards
Akiii |
jQuery is not a language but it is a well written JavaScript code, As quoted on official jQuery website “it is a fast and concise JavaScript Library that simplifies HTML document traversing, event handling, animating, and Ajax interactions for rapid web development.“
In order to work with jQuery you should be aware of basics of JavaScript, HTML and CSS.
It was released in January 2006 at BarCamp NYC by John Resig.
Licensing:
It is free, open source software Dual-licensed under the MIT License and the GNU General Public License. Microsoft has integrated jQuery officially into its IDE Visual Studio 2010 and jQuery intellisense is available in Visual Studio 2010 now. |
jQuery is very compact and well written JavaScript code that increases the productivity of the developer by enabling them to achieve critical UI functionality by writing very less amount of code.
It helps to
# Improve the performance of the application
# Develop most browser compatible web page
# Implement UI related critical functionality without writing hundreds of lines of codes
# Fast
# Extensible – jQuery can be extended to implement customized behavior
Other advantages of jQuery are
# No need to learn fresh new syntax's to use jQuery, knowing simple JavaScript syntax is enough
# Simple and Cleaner code, no need to write several lines of codes to achieve complex functionality. |
jQuery javascript file can be downloaded from jQuery Official website
http://www.jquery.com/ |
jQuery usually comes as a single JavaScript file containing everything comes out of the box with jQuery. It can be included within a web page using the following mark-up:
To load local jQuery file
<script type="text/javascript" src="jQuery-1.4.1-min.js"></script>
Ideally this markup is kept in under <head></head> tag of your web page, however you are free to keep anywhere you want. |