jqzoom实现放大镜效果
邰宇
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>jqzoom</title>
<style type="text/css">
.jqzoom {
float: left;
border: none;
position: relative;
padding: 0;
cursor: pointer;
margin: 0;
display: block
}
.jqzoom img {
width: 500px;
background: url(../images/loading.gif) no-repeat center center
}
.zoomdiv {
z-index: 100;
position: absolute;
top: 0;
left: 0;
width: 500px;
height: 500px;
background: #fff;
border: 1px solid #ddd;
display: none;
text-align: center;
overflow: hidden
}
.jqZoomPup {
z-index: 10;
visibility: hidden;
position: absolute;
top: 0;
left: 0;
width: 20px;
height: 20px;F
border: 1px solid #bbb;
background: #fff;
opacity: .5;
-moz-opacity: .5;
-khtml-opacity: .5;
filter: alpha(Opacity=50)
}
.spec-preview {
width: 500px;
height: 500px;
border: 1px solid #f1f1f1
}
</style>
</head>
<body>
<div id="preview" class="spec-preview" >
<span class="jqzoom">
<img jqimg="jqzoom.jpg" src="jqzoom.jpg"
alt="ha" />
</span>
</div>
<div id="app"></div>
<!-- js代码 -->
<script src="jquery.min.js" type="text/javascript"></script>
<script src="jqzoom.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
//显示区域
$(".jqzoom").jqueryzoom({
xzoom: 480,
yzoom: 410
});
$(document).mousemove(function (e) {
$("#app").text("X: " + e.pageX + ", Y: " + e.pageY);
});
})
</script>
</body>
</html>
//jqzoom.js
(function ($) {
$.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 = '';
//jQueryObject.hover( handlerIn , handlerOut )
//分别指定鼠标移入、移出元素时的事件处理函数。
$(this).hover(function () {
//offsetLeft = left + marginLeft
var imageLeft = this.offsetLeft;
var imageRight = this.offsetRight;
// offsetTop = top +marginTop
var imageTop = $(this).get(0).offsetTop;
//offsetWidth时间获取的是盒模型(width+border+padding)
//like:<div id="app"></div>
//#app { width:200px; height:200px; border:1px solid #ccc; padding:2px; margin:2px; background:#336699;}
//offsetWidth 200+2+4=206
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");
console.log(imageLeft, imageRight, imageWidth, imageHeight, noalt); //1 undefined 500 500 ha
$(this).children("img").attr("alt", '');
//get() 方法获得由选择器指定的 DOM 元素
if ($("div.zoomdiv").get().length == 0) {
$(this).after("<div class='zoomdiv'><img class='bigimg' src='" + bigimage + "'/></div>");
$(this).append("<div class='jqZoomPup'> </div>");
console.log("<div class='zoomdiv'><img class='bigimg' src='" + bigimage + "'/></div>")
}
if (settings.position == "right") {
//1+500+10+480>1920
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'); //十字拖拽
}
$(document.body).mousemove(function (e) {
mouse = new MouseEvent(e);
/*$("div.jqZoomPup").hide();*/
var bigwidth = $(".bigimg").get(0).offsetWidth; //800
var bigheight = $(".bigimg").get(0).offsetHeight; //800
var scaley = 'x';
var scalex = 'y';
if (isNaN(scalex) | isNaN(scaley)) {
var scalex = (bigwidth / imageWidth); //800/500
var scaley = (bigheight / imageHeight);
$("div.jqZoomPup").width((settings.xzoom) / scalex); //480/1.6
$("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; //设置 div.zoomdiv 元素中滚动条的垂直偏移
scrollx = xpos;
$("div.zoomdiv").get(0).scrollLeft = (scrollx) * scalex;
});
},
//离开后
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; //e.pageX：鼠标相对于文档X方向的距离( ie678 不支持)
this.y = e.pageY; //e.pageY：鼠标相对于文档X方向的距离( ie678 不支持)
}
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