jquey实现放大镜功能
Posted xiami2104
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(function ($) {
$.fn.imagezoom = function (options) {
var settings = {
xzoom: 220,
yzoom: 220,
offset: 10,
position: "BTR",
preload: 1,
scale:1
};
if (options) {
$.extend(settings, options);
}
var noalt = ‘‘,iTop,iLeft,iWidth,iHeight;
var self = this;
return self.each(function () {
self.imagezoom = true;
var _this = this;
var explorer = navigator.userAgent;
var mouseAdd = "mousewheel";
if (explorer.indexOf("Firefox") >= 0) {
mouseAdd = "DOMMouseScroll";
}
$("body").off(mouseAdd).on(mouseAdd, "div.zoomMask", function (ev) {
var $this = $(this);
var imgWid = $("div.zoomDiv>img").width();
var zoom = ev.originalEvent.deltaY || (ev.originalEvent.detail > 0 ? ev.originalEvent.detail + 97 : ev.originalEvent.detail-97);
if ($this.width() > iWidth && zoom > 0) {
return;
}
$("div.zoomDiv>img").css({ width: imgWid - zoom, height: "auto" });
var mouseWheel = {
x: ev.originalEvent.clientX,
y: ev.originalEvent.clientY
};
var bigwidth = $(".bigimg").get(0).offsetWidth,
bigheight = $(".bigimg").get(0).offsetHeight,
scalex = (bigwidth / iWidth),
scaley = (bigheight / iHeight),
xpos = mouse.x - $this.width() / 2,
ypos = mouse.y - $this.height() / 2;
$this.width((settings.xzoom) / scalex);
$this.height((settings.yzoom) / scaley);
xpos = (mouseWheel.x - $this.width() / 2 < iLeft) ? iLeft : (mouseWheel.x + $this.width() / 2 > iWidth + iLeft) ? (iWidth + iLeft - $this.width()) : xpos;
ypos = (mouseWheel.y - $this.height() / 2 < iTop) ? iTop : (mouseWheel.y + $this.height() / 2 > iHeight + iTop) ? (iHeight + iTop - $this.height()) : ypos;
$this.css({
top: ypos + $(document).scrollTop(),
left: xpos
});
var xposs = mouseWheel.x - $this.width() / 2 - iLeft,
yposs = mouseWheel.y - $this.height() / 2 - iTop;
$("div.zoomDiv").scrollLeft(xposs * scalex);
$("div.zoomDiv").scrollTop(yposs * scaley);
//$("div.zoomDiv>img").css({ left: "-" + xposs * scalex + "px", top: "-" + yposs * scaley + "px" });
ev.preventDefault();
});
$(this).on("mouseover", function (ev) {
var imageLeft = $(this).offset().left;
var imageTop = $(this).offset().top - $(document).scrollTop();
var imageWidth = $(this).get(0).offsetWidth;
var imageHeight = $(this).get(0).offsetHeight;
iTop = imageTop, iLeft = imageLeft, iWidth = imageWidth, iHeight = imageHeight;
var boxLeft = $(this).parent().offset().left;
var boxTop = $(this).parent().offset().top;
var boxWidth = $(this).parent().width();
var boxHeight = $(this).parent().height();
noalt = $(this).attr("alt");
var bigimage = $(this).attr("rel");
$(this).attr("alt", ‘‘);
var Img = new Image();
Img.src = $(this).attr("src");
Img.onload = function () {
$("div.zoomDiv>img").css({ width: this.width * settings.scale, height: this.height * settings.scale });
};
if ($("div.zoomDiv").length == 0) {
$(document.body).append("<div class=‘zoomDiv‘ style=‘border-radius:25px;‘><img style=‘position:absolute;top:0;left:0;‘ class=‘bigimg‘ src=‘" + bigimage + "‘ onerror=‘citms.nofind();‘ /></div><div class=‘zoomMask‘> </div>");//放大镜框及遮罩
} else {
$("div.zoomDiv>img").attr("src", $(this).attr("src"));
}
$("div.zoomDiv").width(settings.xzoom);
$("div.zoomDiv").height(settings.yzoom);
$("div.zoomDiv").show();
$("div.zoomMask").show();
$(this).css(‘cursor‘, ‘crosshair‘);
$(document.body).off("mousemove").on("mousemove", function (e) {
if ($("div.zoomDiv").length == 0) {
$(document.body).append("<div class=‘zoomDiv‘ style=‘border-radius:25px;‘><img style=‘position:absolute;top:0;left:0;‘ class=‘bigimg‘ src=‘" + bigimage + "‘ onerror=‘citms.nofind();‘ /></div><div class=‘zoomMask‘> </div>");//放大镜框及遮罩
}
var ePageX = e.pageX + 10, ePageY = e.pageY + 10, ceiTop = 0;
if (settings.position == "BTR") {
leftpos = $("div.zoomMask").position().left + $("div.zoomMask").width() + 10;
ceiTop = $("div.zoomMask").position().top;
if ($(document).find(".layout-updown").length == 0) {
if (ePageY + settings.yzoom + 10 > $(document.body).height()) {
ceiTop = ePageY - settings.yzoom - 10
}
} else {
if (ePageY + settings.yzoom + 10 > $(".punishEditLeft").height()) {
ceiTop = ePageY - settings.yzoom - 10
}
}
if (ePageX + settings.xzoom + 10 > $(document.body).width() - 300) {
leftpos = ePageX - settings.xzoom - 20 - ($("div.zoomMask").width() / 2)
}
if ((ePageX - settings.xzoom) / 2 < $("div.zoomMask").width() / 2) {
leftpos = ePageX + ($("div.zoomMask").width() / 2) ;
if (ePageX < $("div.zoomMask").width() / 2) {
leftpos = $("div.zoomMask").width() + 10;
}
}
if ($(document.body).width() - ePageX < ($("div.zoomMask").width() / 2)) {
leftpos = $(document.body).width() - $("div.zoomMask").width() - $("div.zoomDiv").width() - 20
}
} else {
leftpos = imageLeft - settings.xzoom - settings.offset;
if (leftpos < 0) {
leftpos = imageLeft + imageWidth + settings.offset
}
ceiTop = boxTop
}
$("div.zoomDiv").css({ top: ceiTop >= 0?ceiTop:0, left: leftpos });
mouse = {
x: e.originalEvent.clientX,
y: e.originalEvent.clientY
};
if (mouse.x < parseInt(imageLeft) || mouse.x > Math.round(imageLeft + imageWidth) || mouse.y < parseInt(imageTop) || mouse.y > Math.round(imageTop + imageHeight)) {
mouseOutImage();
return;
}
var bigwidth = 0;
var bigheight = 0;
if ($(".bigimg").get(0)) {
bigwidth = $(".bigimg").get(0).offsetWidth;
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.zoomMask").width((settings.xzoom) / scalex);
$("div.zoomMask").height((settings.yzoom) / scaley);
$("div.zoomMask").css(‘visibility‘, ‘visible‘);
}
xpos = mouse.x - $("div.zoomMask").width() / 2;
ypos = mouse.y - $("div.zoomMask").height() / 2;
xposs = mouse.x - $("div.zoomMask").width() / 2 - imageLeft;
yposs = mouse.y - $("div.zoomMask").height() / 2 - imageTop;
xpos = (mouse.x - $("div.zoomMask").width() / 2 < imageLeft) ? imageLeft : (mouse.x + $("div.zoomMask").width() / 2 > imageWidth + imageLeft) ? (imageWidth + imageLeft - $("div.zoomMask").width()) : xpos;
ypos = (mouse.y - $("div.zoomMask").height() / 2 < imageTop) ? imageTop : (mouse.y + $("div.zoomMask").height() / 2 > imageHeight + imageTop) ? (imageHeight + imageTop - $("div.zoomMask").height()) : ypos;
$("div.zoomMask").css({
top: ypos + $(document).scrollTop(),
left: xpos
});
$("div.zoomDiv").scrollLeft(xposs * scalex);
$("div.zoomDiv").scrollTop(yposs * scaley);
//$("div.zoomDiv").get(0).scrollTop = yposs * scaley;
//var MaskLeft = -xposs * scalex;
//console.log(-xposs * scalex + "&&&" + -yposs * scaley);
//if (-xposs * scalex)
//$("div.zoomDiv>img").css({ left: -xposs * scalex > 0 ? 0 : -xposs * scalex, top: -yposs * scaley > 0 ? 0 : -yposs * scaley });
});
});
});
var count = 0;
function mouseOutImage() {
$(self).attr("alt", noalt);
$(document.body).unbind("mousemove");
$("div.zoomMask").hide();
$("div.zoomDiv").hide();
mouseImg = null;
}
if (settings.preload) {
$(‘body‘).append("<div style=‘display:none;‘ class=‘jqPreload" + count + "‘></div>");
$(this).each(function () {
var imagetopreload = $(this).attr("rel");
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;
}
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