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Magnifying glass for image zoom using Jquery and CSS3


Hover above the image to see the action.

The code uses CSS3 box-shadow and border-radius properties to create the magnifying glass. Jquery is used to position it at the cursor coordinates and change the background position accordingly.

Magnifying glass for image zoom using Jquery and CSS3

Moving the cursor away from the image gently fades out the magnifying glass bringing the image back to the default state.



<!-- Lets make a simple image magnifier -->
<div class="magnify">
    <!-- This is the magnifying glass which will contain the original/large version -->
    <div class="large"></div>
    <!-- This is the small image -->
    <img class="small" src="" width="200"/>

<!-- Lets load up prefixfree to handle CSS3 vendor prefixes -->
<script src="" type="text/javascript"></script>
<!-- You can download it from -->

<!-- Time for jquery action -->
<script src="" type="text/javascript"></script>


/*Some CSS*/
* {margin: 0; padding: 0;}
.magnify {width: 200px; margin: 50px auto; position: relative;}

/*Lets create the magnifying glass*/
.large {
    width: 175px; height: 175px;
    position: absolute;
    border-radius: 100%;
    /*Multiple box shadows to achieve the glass effect*/
    box-shadow: 0 0 0 7px rgba(255, 255, 255, 0.85),
    0 0 7px 7px rgba(0, 0, 0, 0.25),
    inset 0 0 40px 2px rgba(0, 0, 0, 0.25);
    /*Lets load up the large image first*/
    background: url('') no-repeat;
    /*hide the glass by default*/
    display: none;

/*To solve overlap bug at the edges during magnification*/
.small { display: block; }

- jQuery


    var native_width = 0;
    var native_height = 0;

    //Now the mousemove function
        //When the user hovers on the image, the script will first calculate
        //the native dimensions if they don't exist. Only after the native dimensions
        //are available, the script will show the zoomed version.
        if(!native_width && !native_height)
            //This will create a new image object with the same image as that in .small
            //We cannot directly get the dimensions from .small because of the
            //width specified to 200px in the html. To get the actual dimensions we have
            //created this image object.
            var image_object = new Image();
            image_object.src = $(".small").attr("src");
            //This code is wrapped in the .load function which is important.
            //width and height of the object would return 0 if accessed before
            //the image gets loaded.
            native_width = image_object.width;
            native_height = image_object.height;
            //x/y coordinates of the mouse
            //This is the position of .magnify with respect to the document.
            var magnify_offset = $(this).offset();
            //We will deduct the positions of .magnify from the mouse positions with
            //respect to the document to get the mouse positions with respect to the
            var mx = e.pageX - magnify_offset.left;
            var my = e.pageY -;
            //Finally the code to fade out the glass if the mouse is outside the container
            if(mx < $(this).width() && my < $(this).height() && mx > 0 && my > 0)
                //The background position of .large will be changed according to the position
                //of the mouse over the .small image. So we will get the ratio of the pixel
                //under the mouse pointer with respect to the image and use that to position the
                //large image inside the magnifying glass
                var rx = Math.round(mx/$(".small").width()*native_width - $(".large").width()/2)*-1;
                var ry = Math.round(my/$(".small").height()*native_height - $(".large").height()/2)*-1;
                var bgp = rx + "px " + ry + "px";
                //Time to move the magnifying glass with the mouse
                var px = mx - $(".large").width()/2;
                var py = my - $(".large").height()/2;
                //Now the glass moves with the mouse
                //The logic is to deduct half of the glass's width and height from the
                //mouse coordinates to place it with its center at the mouse coordinates
                //If you hover on the image now, you should see the magnifying glass in action
                $(".large").css({left: px, top: py, backgroundPosition: bgp});


Tags: html, css, layout, jquery, plugin, internet, image, magnify, glass, zoom

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