Change Image Opacity on MouseOver using jQuery
Posted by: Suprotim Agarwal ,
on 12/28/2009,
in
Category jQuery and ASP.NET
Abstract: This short article demonstrates how to change the opacity of an image when the user hovers the mouse over an image.
Change Image Opacity on MouseOver using jQuery
Note that for demonstration purposes, I have included jQuery and CSS code in the same page. Ideally, these resources should be created in separate folders for maintainability.
Let us quickly jump to the solution and see how we can change the opacity of an image.
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Change Image Opacity on Hover</title>
<style type="text/css">
.imgOpa
{
height:250px;
width:250px;
opacity:0.3;
filter:alpha(opacity=30);
}
</style>
<script type="text/javascript"
src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js">
</script>
<script type="text/javascript">
$(function() {
$('.imgOpa').each(function() {
$(this).hover(
function() {
$(this).stop().animate({ opacity: 1.0 }, 800);
},
function() {
$(this).stop().animate({ opacity: 0.3 }, 800);
})
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2>Hover over an Image to change its Transparency level</h2>
<br />
<asp:Image ID="Image1" runat="server"
ImageUrl="../images/1.jpg" class="imgOpa" />
<asp:Image ID="Image2" runat="server"
ImageUrl="../images/2.jpg" class="imgOpa" />
<asp:Image ID="Image3" runat="server"
ImageUrl="../images/3.jpg" class="imgOpa" />
<asp:Image ID="Image4" runat="server"
ImageUrl="../images/4.jpg" class="imgOpa" />
</div>
</form>
</body>
</html>
In this example, observe that the images have a class attribute ‘imgOpa’. The definition of the CSS class is as shown here:
.imgOpa
{
height:250px;
width:250px;
opacity:0.3;
filter:alpha(opacity=30);
}
When the images are loaded, they are in a semitransparent state. In Firefox, Chrome and Safari, we use the opacity:n property for transparency. The opacity value can be from 0.0 - 1.0, where a lower value makes the element more transparent.
In IE 7 and later, we use filter:alpha(opacity=n) property for transparency, where the opacity value can be from 0-100.
This is how the images appear in a semitransparent when they are loaded:
When the user hovers the mouse over a semitransparent image, we use the jQuery hover() method to animate the opacity property from 0.3 to 1.0, thereby creating a cool effect on the images. The code to achieve this effect is shown below:
$(this).hover(
function() {
$(this).stop().animate({ opacity: 1.0 }, 800);
},
function() {
$(this).stop().animate({ opacity: 0.3 }, 800);
})
});
The screenshot shown below shows how the image will appear when the user hovers the mouse over an image; let us say the first image. The transparency of the image is changed from 0.3 to 1.0.
This article has been editorially reviewed by Suprotim Agarwal.
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Suprotim Agarwal, MCSD, MCAD, MCDBA, MCSE, is the founder of
DotNetCurry,
DNC Magazine for Developers,
SQLServerCurry and
DevCurry. He has also authored a couple of books
51 Recipes using jQuery with ASP.NET Controls and
The Absolutely Awesome jQuery CookBook.
Suprotim has received the prestigious Microsoft MVP award for ten consecutive times. In a professional capacity, he is the CEO of A2Z Knowledge Visuals Pvt Ltd, a digital group that offers Digital Marketing and Branding services to businesses, both in a start-up and enterprise environment.
Get in touch with him on Twitter @suprotimagarwal or at LinkedIn