使用jqzoom插件实现图片放大镜效果-蒲公英云

jqzoom插件实现图片放大镜效果。

图1.1jqzoom插件实现图片放大镜效果

1、引入jqurty和jqzoom插件

<script src="/js/common/jquery-1.6.2.js" type="text/javascript"></script>
<script src="/js/common/jquery.jqzoom.js" type="text/javascript"></script>

2、应用官方网站给定的样式

/*jQzoom*/
.jqzoom{
    border:1px solid #BBB;
    float:left;
    position:relative;
    padding:0px;
    cursor:pointer;
}
div.zoomdiv {
    z-index:    999;
    position                : absolute;
    top:0px;
    left:0px;
    width                   : 200px;
    height                  : 200px;
    background: #ffffff;
    border:1px solid #CCCCCC;
    display:none;
    text-align: center;
    overflow: hidden;
}
div.jqZoomPup {
    z-index                 : 999;
    visibility              : hidden;
    position                : absolute;
    top:0px;
    left:0px;
    width                   : 50px;
    height                  : 50px;
    border: 1px solid #aaa;
    background: #ffffff url(/images/shopping/zoomlens.gif) 50% top  no-repeat;
    opacity: 0.5;
    -moz-opacity: 0.5;
    -khtml-opacity: 0.5;
    filter: alpha(Opacity=50);
}

3、编写HTML代码

<div class="jqzoom">
    <img src="/images/shopping/pro_img/blue_one_small.jpg" style="width:300px; height:300px;" alt=""  jqimg="/images/shopping/pro_img/blue_one_big.jpg" id="bigImg"/>
</div>

其中，在HTML代码中添加该插件自定义的jqimg属性，值为大图的文件路径。

4、查看官方网站的API使用说明，可以写出如下JS代码

/*使用jqzoom*/
$(function() {
    $(".jqzoom").jqueryzoom({
        xzoom: 300, //放大图的宽度(默认是 200)
        yzoom: 300, //放大图的高度(默认是 200)
        offset: 10, //离原图的距离(默认是 10)
        position: "right", //放大图的定位(默认是 "right")
        preload: 1
    });
});

* 附件

附件1：jquery.jqzoom.js

//**************************************************************
// jQZoom allows you to realize a small magnifier window,close
// to the image or images on your web page easily.
//
// jqZoom version 2.2
// Author Doc. Ing. Renzi Marco(www.mind-projects.it)
// First Release on Dec 05 2007
// i'm looking for a job,pick me up!!!
// mail: renzi.mrc@gmail.com
//**************************************************************
(function($){
        $.fn.jqueryzoom = function(options){
        var settings = {
                xzoom: 200,        //zoomed width default width
                yzoom: 200,        //zoomed div default width
                offset: 10,        //zoomed div default offset
                position: "right" ,//zoomed div default position,offset position is to the right of the image
                lens:1, //zooming lens over the image,by default is 1;
                preload: 1
            };
            if(options) {
                $.extend(settings, options);
            }
            var noalt='';
            $(this).hover(function(){
            var imageLeft = $(this).offset().left;                
            var imageTop = $(this).offset().top;
            var imageWidth = $(this).children('img').get(0).offsetWidth;
            var imageHeight = $(this).children('img').get(0).offsetHeight;
            noalt= $(this).children("img").attr("alt");
            var bigimage = $(this).children("img").attr("jqimg");
            $(this).children("img").attr("alt",'');
            if($("div.zoomdiv").get().length == 0){
            $(this).after("<div class='zoomdiv'><img class='bigimg' src='"+bigimage+"'/></div>");
            $(this).append("<div class='jqZoomPup'> </div>");
            }
            if(settings.position == "right"){
            if(imageLeft + imageWidth + settings.offset + settings.xzoom > screen.width){
            leftpos = imageLeft  - settings.offset - settings.xzoom;
            }else{
            leftpos = imageLeft + imageWidth + settings.offset;
            }
            }else{
            leftpos = imageLeft - settings.xzoom - settings.offset;
            if(leftpos < 0){
            leftpos = imageLeft + imageWidth  + settings.offset;
            }
            }
            $("div.zoomdiv").css({ top: imageTop,left: leftpos });
            $("div.zoomdiv").width(settings.xzoom);
            $("div.zoomdiv").height(settings.yzoom);
            $("div.zoomdiv").show();
            if(!settings.lens){
              $(this).css('cursor','crosshair');
            }
                   $(document.body).mousemove(function(e){
                   mouse = new MouseEvent(e);
                   /*$("div.jqZoomPup").hide();*/
                    var bigwidth = $(".bigimg").get(0).offsetWidth;
                    var bigheight = $(".bigimg").get(0).offsetHeight;
                    var scaley ='x';
                    var scalex= 'y';
                    if(isNaN(scalex)|isNaN(scaley)){
                    var scalex = (bigwidth/imageWidth);
                    var scaley = (bigheight/imageHeight);
                    $("div.jqZoomPup").width((settings.xzoom)/scalex );
                    $("div.jqZoomPup").height((settings.yzoom)/scaley);
                    if(settings.lens){
                    $("div.jqZoomPup").css('visibility','visible');
                    }
                   }
                    xpos = mouse.x - $("div.jqZoomPup").width()/2 - imageLeft;
                    ypos = mouse.y - $("div.jqZoomPup").height()/2 - imageTop ;
                    if(settings.lens){
                    xpos = (mouse.x - $("div.jqZoomPup").width()/2 < imageLeft ) ? 0 : (mouse.x + $("div.jqZoomPup").width()/2 > imageWidth + imageLeft ) ?  (imageWidth -$("div.jqZoomPup").width() -2)  : xpos;
                    ypos = (mouse.y - $("div.jqZoomPup").height()/2 < imageTop ) ? 0 : (mouse.y + $("div.jqZoomPup").height()/2  > imageHeight + imageTop ) ?  (imageHeight - $("div.jqZoomPup").height() -2 ) : ypos;
                    }
                    if(settings.lens){
                    $("div.jqZoomPup").css({ top: ypos,left: xpos });
                    }
                    scrolly = ypos;
                    $("div.zoomdiv").get(0).scrollTop = scrolly * scaley;
                    scrollx = xpos;
                    $("div.zoomdiv").get(0).scrollLeft = (scrollx) * scalex ;
                    });
            },function(){
               $(this).children("img").attr("alt",noalt);
               $(document.body).unbind("mousemove");
               if(settings.lens){
               $("div.jqZoomPup").remove();
               }
               $("div.zoomdiv").remove();
            });
        count = 0;
        if(settings.preload){
        $('body').append("<div style='display:none;' class='jqPreload"+count+"'>sdsdssdsd</div>");
        $(this).each(function(){
        var imagetopreload= $(this).children("img").attr("jqimg");
        var content = jQuery('div.jqPreload'+count+'').html();
        jQuery('div.jqPreload'+count+'').html(content+'<img src=\"'+imagetopreload+'\">');
        });
        }
        }
})(jQuery);
function MouseEvent(e) {
      this.x = e.pageX;
      this.y = e.pageY;
}