web front-end entry to the combat: Plug larger image larger image hover effect

We know jquery plugins are very powerful, share point jquery plug-in effects, easy to use development effect.

A, HTML Code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jquery图片放大插件鼠标滑过图片放大效果</title>
<meta name="description" content="jquery图片放大插件制作一个当鼠标滑过图片，图片按等比例缩放放大效果。动画图片放大展示特效。jQuery插件。" />
</head>

<body>

<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>
<script type="text/javascript" src="js/jquery.zoomImgRollover.js"></script>
<script type="text/javascript">
$(document).ready(function() {
    $("#testimg").zoomImgRollover();
});
</script>

<style type="text/css">
*{margin:0;padding:0;list-style-type:none;}
a,img{border:0;}
.demo{width:544px;margin:20px auto;}
</style>

<div class="demo">
    <a href='http://www.3mooc.com/' style="border:1px solid #000;">
        <img id="testimg" width="400" height="564" src="images/132ad.jpg" alt="" border="0">
    </a>
</div>

</body>
</html>
web前端开发学习Q-q-u-n： 767-273-102 ，分享学习的方法和需要注意的小细节，不停更新最新的教程和学习方法（详细的前端项目实战教学视频，PDF）

Second, the plug-in code (plugin name: jquery.zoomImgRollover.js)

(function(jQuery){ 

    jQuery.fn.zoomImgRollover = function(options) {

        var defaults = {
            percent:30,
            duration:600
        }; 

        var opts = jQuery.extend(defaults, options);

        // static zoom function
        function imageZoomStep(jZoomImage, x, origWidth, origHeight)
        {
            var width = Math.round(origWidth * (.5 + ((x * opts.percent) / 200))) * 2;
            var height = Math.round(origHeight * (.5 + ((x * opts.percent) / 200))) * 2;

            var left = (width - origWidth) / 2;
            var top = (height - origHeight) / 2;

            jZoomImage.css({width:width, height:height, top:-top, left:-left});
        }

        return this.each(function()
        {
            var jZoomImage = jQuery(this);
            var origWidth = jZoomImage.width();
            var origHeight = jZoomImage.height();

            // add css ness. to allow zoom
            jZoomImage.css({position: "relative"});
            jZoomImage.parent().css({overflow: "hidden", display:"block", position: "relative", width: origWidth, height: origHeight});

            jZoomImage.mouseover(function()
            {
                jZoomImage.stop().animate({dummy:1},{duration:opts.duration, step:function(x)
                {
                    imageZoomStep(jZoomImage, x, origWidth, origHeight)
                }});
            });

            jZoomImage.mouseout(function()
            {
                jZoomImage.stop().animate({dummy:0},{duration:opts.duration, step:function(x)
                {
                    imageZoomStep(jZoomImage, x, origWidth, origHeight)
                }});
            });
        });
    };

})(jQuery);
web前端开发学习Q-q-u-n： 767-273-102 ，分享学习的方法和需要注意的小细节，不停更新最新的教程和学习方法（详细的前端项目实战教学视频，PDF）

web front-end entry to the combat: Plug larger image larger image hover effect

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