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<!DOCTYPE html>
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< html lang = 'en' > < head >
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< meta charset = "utf-8" >
< meta name = "viewport" content = "width=device-width, minimum-scale=1, maximum-scale=1" > < meta http-equiv = 'content-type' content = 'text/html; charset=UTF-8' / > < / head > < body >
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< div data-role = "page" >
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< div data-role = "header" >
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< h1 > .addClass()< / h1 >
< / div >
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< div data-role = "content" data-theme = "c" id = "addClass1" >
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< h2 class = "jq-clearfix roundTop section-title" >
< span class = "name" > .addClass( className )< / span > < span class = "returns" > Returns: < a class = "return" href = "http://docs.jquery.com/Types#jQuery" > jQuery< / a > < / span >
< / h2 >
< div class = " entry-details" >
< p class = "desc" > < strong > Description: < / strong > Adds the specified class(es) to each of the set of matched elements.< / p >
< ul class = "signatures" >
< li class = "signature" id = "addClass-className" >
< h4 class = "name" >
< span class = "versionAdded" > version added: < a href = "/category/version/1.0/" > 1.0< / a > < / span > .addClass( className )< / h4 >
< p class = "arguement" > < strong > className< / strong > One or more class names to be added to the class attribute of each matched element.< / p >
< / li >
< li class = "signature" id = "addClass-functionindex, class" >
< h4 class = "name" >
< span class = "versionAdded" > version added: < a href = "/category/version/1.4/" > 1.4< / a > < / span > .addClass( function(index, class) )< / h4 >
< p class = "arguement" > < strong > function(index, class)< / strong > A function returning one or more space-separated class names to be added. Receives the index position of the element in the set and the old class value as arguments.< / p >
< / li >
< / ul >
< div class = "longdesc" >
< p > It's important to note that this method does not replace a class. It simply adds the class, appending it to any which may already be assigned to the elements.< / p >
< p > More than one class may be added at a time, separated by a space, to the set of matched elements, like so:< / p >
< pre > $('p').addClass('myClass yourClass');< / pre >
< p > This method is often used with < code > .removeClass()< / code > to switch elements' classes from one to another, like so:< / p >
< pre > $('p').removeClass('myClass noClass').addClass('yourClass');< / pre >
< p > Here, the < code > myClass< / code > and < code > noClass< / code > classes are removed from all paragraphs, while < code > yourClass< / code > is added.< / p >
< p > As of jQuery 1.4, the < code > .addClass()< / code > method allows us to set the class name by passing in a function.< / p >
< pre > $('ul li:last').addClass(function() {
return 'item-' + $(this).index();
});< / pre >
< p > Given an unordered list with five < code > < li> < / code > elements, this example adds the class "item-4" to the last < code > < li> < / code > .< / p >
< / div >
< h3 > Examples:< / h3 >
< div id = "entry-examples" class = "entry-examples" >
< div id = "example-0" >
< h4 > Example: < span class = "desc" > Adds the class 'selected' to the matched elements.< / span >
< / h4 >
< pre > < code class = "example demo-code" > < !DOCTYPE html>
< html>
< head>
< style>
p { margin: 8px; font-size:16px; }
.selected { color:blue; }
.highlight { background:yellow; }
< /style>
< script src="http://code.jquery.com/jquery-latest.js"> < /script>
< /head>
< body>
< p> Hello< /p>
< p> and< /p>
< p> Goodbye< /p>
< script> $("p:last").addClass("selected");< /script>
< /body>
< /html> < / code > < / pre >
< h4 > Demo:< / h4 >
< div class = "demo code-demo" > < / div >
< / div >
< div id = "example-1" >
< h4 > Example: < span class = "desc" > Adds the classes 'selected' and 'highlight' to the matched elements.< / span >
< / h4 >
< pre > < code class = "example demo-code" > < !DOCTYPE html>
< html>
< head>
< style>
p { margin: 8px; font-size:16px; }
.selected { color:red; }
.highlight { background:yellow; }
< /style>
< script src="http://code.jquery.com/jquery-latest.js"> < /script>
< /head>
< body>
< p> Hello< /p>
< p> and< /p>
< p> Goodbye< /p>
< script> $("p:last").addClass("selected highlight");< /script>
< /body>
< /html> < / code > < / pre >
< h4 > Demo:< / h4 >
< div class = "demo code-demo" > < / div >
< / div >
< / div >
< / div >
< / div >
< / div >
< / body > < / html >
