JQuery Programmer

eq() returns the element as a jQuery object. This method constructs a new jQuery object from one element within that set and returns it. That means that you can use jQuery functions on it.

get() return a DOM element. The method retrieve the DOM elements matched by the jQuery object. But as it is a DOM element and it is not a jQuery-wrapped object. So jQuery functions can't be used.

ID and element selectors are the fastest selectors in jQuery.

The css( name ) method returns a style property on the first matched element.

This will select all the div elements on page.

The starting point of jQuery code execution is $(document).ready() function which is executed when DOM is loaded.

jQuery library comes in 2 different versions Development and Production/Deployment. The deployment version is also known as minified version. So .min.js is basically the minified version of jQuery library file. Both the files are same as far as functionality is concerned. but .min.js is quite small in size so it loads quickly and saves bandwidth

The plugin can be considered to be simply a new method that can be used by a user to extend the prototype object of a jquery. A plugin performs some actions on a collection of elements. Each method that comes with the jquery core can be considered to be a plugin.

The code for creating a plugin that would add and remove a class on hover would be as follows:

(function($)

{

$.fn.hoverClass = function(c)

{

return this.hover(

function() { $(this).toggleClass(c); }

);

};

})(jQuery);

// using the plugin

$('li').hoverClass('hover');

The css( name, value ) method sets a single style property to a value on all matched elements.

The width( ) method gets the current computed, pixel, width of the first matched element.

The html( val ) method sets the html contents of every matched element.

A plug-in is piece of code written in a standard JavaScript file. These files provide useful jQuery methods which can be used along with jQuery library methods. jQuery plugins are quite useful as its piece of code which is already written by someone and re-usable, which saves your development time.

The remove( expr ) method removes all matched elements from the DOM.

Using $.type(Object) which returns the built-in JavaScript type for the object.