使用jqzoom插件实现图片放大镜效果

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

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

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: [email protected]
//**************************************************************

(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("
");


		    $(this).append("
 
");

		    }


		    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("
sdsdssdsd
");

		$(this).each(function(){

        var imagetopreload= $(this).children("img").attr("jqimg");

        var content = jQuery('div.jqPreload'+count+'').html();

        jQuery('div.jqPreload'+count+'').html(content+'');

		});

		}

		}

})(jQuery);

function MouseEvent(e) {
      this.x = e.pageX;
      this.y = e.pageY;
}

附件2：放大镜图标（zoomlens.gif）