The addClass(classes) method can be used to apply defined style sheets onto all the matched elements. You can specify multiple classes separated by space. Example Following is a sample example which set src attribute of an image tag to a correct location. <html> <head> <title>The title</title> <script type=”text/javascript” src=”/jquery/jquery-1.3.2.min.js”></script> <script type=”text/javascript” language=”javascript”> $(document).ready(function(){ $(“em”).addclass(“selected”); $(“#myid”).addClass(“highlight”); }); </script> <style> .selected {color:red; } .highlight{background:yellow;} </style> </head> <body> <em title=”Bold and Brave”> This is first paragraph.</em> <p id=”myid”> This is second paragraph.</p> </body> </html> Useful Attribute Methods Following table lists down few useful methods which you can use to manipulate attributes and properties:
| Methods | Description |
| attr(properties) | Set a key /value object as properties to all matched elements. |
| attr(key,fn) | Set a single property to a computes value, on all matched elements. |
| removeAttr(name) | Remove an attribute from each of the matched elements. |
| hasclass(class) | Returns true if the specified class is present on at least one of the set of matched elements. |
| removeClass(class) | Removes all or the specified class(es) form the set of matched elements. |
| toggleClass(class) | Adds the specified class if it is not present, removes the specified class if it is present. |
| html() | Get the html contents (innerHTML) of the first matched element |
| html(val) | Set the html contents of every of every matched element. |
| text() | Get the combined text contents of all matched elements. |
| text(val) | Set the text contents of all matched elements. |
| val() | Get the input value of the first matched element |
| val(val) | Set the attribute of every matched element if it is called on <input> but if it is called on <select> with the passed <option> value then passed option would be selected, if it is called on check box or radio box then all the matching check box an d radiobox would be checked. |
Similar to above syntax and examples, following examples give you understanding on using various attribute methods in different situation $(“#myID”).attr(“custom”) 
This would return value of attribute custom for the first element matching with ID myID. $(“img”).attr(“alt”,”Sample Image”) This sets the alt attribute of all the images to a new value “Sample Image” $(“input”).attr({value:””,”Sample Image”); Sets the value of all <input> elements to the empty string, as well as sets the title to the string please enter a value. $(“a[href^=http://]”).attr(“target”,”_blank”) selects all links with an href attribute starting with http:// and set its target attribute to _blank $(“a”).removeAttr(“target”) This would remove target attribute of all the links. $(“form”).submit(function() { $(“:submit”,this).attr(“disabled”,”disabled”);}); This would modify the disabled attribute to the value “disabled” while clicking submit button. $(“p:last”).hasClass(“selected”) This return true if last <p> tag has associated classselected. $(“p”).text() Returns string that contains the combined text contents of all matched<p> elements. $(“p”).text(“<i>Hello World</i>”) this would set “<i>Hello World</I> as text content of the matching <p> elements $(“p”).html() This returns the HTML content of the all matching paragraphs. $(“div”).html(“Hello World”) This would set the HTML Content of al matching <div> to Hello world. $(“input:checkbox:checked”).val() Get the first value from a checked checkbox $(“input:radio[name=bar]:checked”).val() Get the first value from a set of radio buttons $(“button”).val(“Hello”) Sets the value attribute of every matched element <button> $(“input”).val(“on”) This would check all the radio or check box button whose value is “on”. $(“select”).val(“Orange”) This would select Orange option in a dropdown box with options Orange, Mango and Banana. $(“select”).val(“Orange”,”Mango”) This would select orange and Mango options in a dropdown box with options Orange, Mango and Banana.
JQuery is a very powerful tool which provides a variety of DOM traversal methods to help us select elements in a document randomly as well as in sequential method. Most of the DOM Traversal Methods do not modify the JQuery object and they are used to filter our elements from a document based on given conditions. Find Elements by index Consider a simple document with the following HTML content. <html> <head> <title>the title</title> </head> <body> <div> <ul> <li> List item 1</li> <li>list item 2</li> <li>list item 3</li> <li>list item4 </li> <li>list item5 </li> <li>list item6 </li> </ul> </div> </body> </html>
Example: Following is a simple example which adds the color to second item. <html> <head> <title> The title</title> <script type=”text/javascrpit” src=”/jquery/jquery-1.3.2.min.js></script> <script type=”text/javascript” language=”javascript”> $(document).ready(function(){ $(“li”).eq(2).addClass(“selected”); }); </script> <style> .selected{color:red;} </style> </head> <body> <div> <ul> <li> list item 1</li> <li> list item 2</li> <li> list item 3</li> <li> list item 4</li> <li> list item 5</li> <li> list item 6</li> </ul> </div> </body> </html>
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