imgZoom.js
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var $=require("jquery");
+function($){
'use strict';
function ImgZoom(element,options){
this.$element = $(element);
if(!options){
this.options = this.getDefaults();
}else{
this.options = $.extend(true,this.getDefaults(),options);
}
this.init();
}
ImgZoom.DEFAULTS = {
isContainFather: false,
overlay: true,
template:'<div class="imgZoom" onselectstart="return false" unselecttable="on">'+
'<img src="" />'+
'<a href="javascript:;" class="close"></a>'+
'<a href="javascript:;" class="guideBtn prev"></a>'+
'<a href="javascript:;" class="guideBtn next"></a>'+
'</div>'+
'<div class="overlay"></div>',
imgSrcAttr:'data-original'
};
ImgZoom.prototype.getDefaults = function () {
return ImgZoom.DEFAULTS;
};
//初始化
ImgZoom.prototype.init = function(){
this.overlay = this.options.overlay;
var $template = $('.imgZoom,.overlay');
this.$template = !!$template.size() ? $template : ($(this.options.template).appendTo("body"));//Dom对象
this.$box = this.$template.filter('.imgZoom');//相册对象
this.$overlayObj = this.$template.filter('.overlay');//遮罩对象
this.$btnPrev = this.$template.find('.guideBtn.prev');//上一张按钮
this.$btnNext = this.$template.find('.guideBtn.next');//下一张按钮
this.$btnClose = this.$template.find('.close');//关闭按钮
this.currentObj = 'currentPhoto';//当前图片的标识类
this.event();
if(this.options.isContainFather){
this.$element.find('['+this.options.imgSrcAttr+']').eq(0).trigger('click.imgzoom');
}
};
//事件绑定集合
ImgZoom.prototype.event = function(){
var _this = this;
this.btnClick();
this.photoClick();
this.$overlayObj.on('click',function(){
_this.close();
});
};
//左右按钮点击事件
ImgZoom.prototype.btnClick = function(){
var _this = this;
this.$btnPrev.off('click');
this.$btnNext.off('click');
this.$btnPrev.on("click",function(){
var that = _this.$template.data('target');
that.photoSwitch(that.$element.find('['+_this.options.imgSrcAttr+']').index(that.$element.find("."+that.currentObj)),"left");
});
this.$btnNext.on("click",function(){
var that = _this.$template.data('target');
that.photoSwitch(that.$element.find('['+_this.options.imgSrcAttr+']').index(that.$element.find("."+that.currentObj)),"right");
//console.log(_this.$element);
});
};
//图片点击事件
ImgZoom.prototype.photoClick = function(){
var _this = this;
this.$element.on("click.imgzoom",'['+_this.options.imgSrcAttr+']',function(){
_this.$element.find("."+_this.currentObj).removeClass(_this.currentObj);
$(this).addClass(_this.currentObj);
_this.$template.data('target', _this);
_this.photoEfficiency();
});
};
//图片左右切换事件
ImgZoom.prototype.photoSwitch = function(index,direction){
this.$element.find("."+this.currentObj).removeClass(this.currentObj);
var _index;
if(direction=="left"){
_index = index - 1;
}else{
_index = index + 1;
}
this.$element.find("["+this.options.imgSrcAttr+"]:eq("+_index+")").addClass(this.currentObj);
this.photoEfficiency();
};
//检测首尾状态
ImgZoom.prototype.getArrowState = function(){
if(this.$element.find('['+this.options.imgSrcAttr+']').index(this.$element.find("."+this.currentObj))===0){
this.$btnPrev.hide();
}else{
this.$btnPrev.show();
}
if(this.$element.find('['+this.options.imgSrcAttr+']').index(this.$element.find("."+this.currentObj))==this.$element.find('['+this.options.imgSrcAttr+']').size()-1){
this.$btnNext.hide();
}else{
this.$btnNext.show();
}
};
//图片显示效果
ImgZoom.prototype.photoEfficiency = function(){
var _this = this;
var hiddenImg = $('<img src="'+_this.$element.find("."+this.currentObj).attr(this.options.imgSrcAttr)+'">').appendTo("body").css({"position":"fixed",'left':'-9999px','top':'-9999px'});
this.loadImg(hiddenImg.attr("src"), function(){
_this.$box.find("img").remove().end().prepend(hiddenImg.removeAttr("style"));
if(!_this.$box.hasClass("show")){
_this.open();
}
if(!_this.$box.hasClass("complete")){
_this.$box.addClass("complete");
}
_this.$box.css("margin-top",-_this.$box.outerHeight()/2);
_this.$box.css("margin-left",-_this.$box.outerWidth()/2);
});
_this.getArrowState();
};
ImgZoom.prototype.loadImg = function(src, callback){
var img = new Image();
if($.browser.msie){
obj.onreadystatechange=function(){
if(this.readyState=="complete"){
callback.call(img);//将回调函数的this替换为Image对象
img = null;
}
};
}else{
img.onload = function () { //图片下载完毕时异步调用callback函数。
callback.call(img);//将回调函数的this替换为Image对象
img = null;
};
}
img.src = src;
};
//打开事件
ImgZoom.prototype.open = function(){
this.$box.addClass("show");
if(this.options.overlay){
this.$overlayObj.fadeIn(100);
}
};
//关闭事件
ImgZoom.prototype.close = function(){
this.$box.removeClass("show complete");
if(this.options.overlay){
this.$overlayObj.fadeOut(100);
}
};
//组件封装处理
function Plugin(option,object){
this.each(function(){
var $this = $(this),
data = $this.data('hc.ImgZoom'),
options = typeof option == 'object' && option;
if(!data){
$this.data('hc.ImgZoom',(data = new ImgZoom($this,options)));
}
if(typeof option =='string'){
data[option](object);
}
return $this;
});
}
var old = $.fn.ImgZoom;
$.fn.ImgZoom = Plugin;
$.fn.ImgZoom.Constructor = ImgZoom;
$.fn.ImgZoom.noConflict = function () {
$.fn.ImgZoom = old;
return this;
};
}($);