使用jqzoom插件实现图片放大镜效果

一时失言乱红尘 2021-09-12 08:42 735阅读 0赞

jqzoom插件实现图片放大镜效果。

![1333548315_2346.png][]

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: 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;
    }

附件2：放大镜图标（zoomlens.gif）

![1333549036_8494.gif][]

[1333548315_2346.png]: https://img-my.csdn.net/uploads/201204/04/1333548315_2346.png
[1333549036_8494.gif]: https://img-my.csdn.net/uploads/201204/04/1333549036_8494.gif