imgSlider.js
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var $ = require("jquery");
require('./lazyloadImage');
;
(function(global, undefined) {
var ImgSlider = function(element, options) {
this.options = options;
this.$wrap = $(element);
this.$element = $(element).find("ul");
this.$lis = this.$element.find("li");
this.$ctrl = $(this.options.slideCtrl).appendTo(this.$wrap);
this.$btnPrev = this.$ctrl.find('.slide-ctrl-prev'); //上一张按钮
this.$btnNext = this.$ctrl.find('.slide-ctrl-next'); //下一张按钮
this.len = this.$lis.length;
this.width = this.$lis.width() + parseInt(this.$lis.css("margin-right"));
this.index = 1;
this.page = 1;
this.init();
};
ImgSlider.DEFAULTS = {
slideCtrl: '<div class="slide-ctrl"><a class="slide-ctrl-prev" href="javascript:;"></a><a class="slide-ctrl-next" href="javascript:;"></a></div>',
pageNum: 4,
itemClass: ''
};
ImgSlider.prototype = {
constructor: ImgSlider,
init: function() {
var _this = this;
if (this.len <= 4) return;
this._calculationWidth(this.len, this.width);
this.$btnPrev.hide();
// 绑定事件
this._bindEvent();
},
/*
* next
*/
next: function() {
this.$btnPrev.show();
this.index++;
this._animate(-this.width);
},
/*
* prev
*/
prev: function() {
this.$btnNext.show();
this.index--;
this._animate(this.width);
},
/*
* 插件事件绑定
*/
_bindEvent: function() {
var _this = this;
this.$btnNext.on("click", function() {
if (_this.$element.is(':animated')) return;
_this.next();
_this.$element.find("img").lazyload();
if (_this.index == _this.len - _this.options.pageNum + 1) {
$(this).hide();
};
});
this.$btnPrev.on("click", function() {
if (_this.$element.is(':animated')) return;
_this.prev();
if (_this.index == 1) {
$(this).hide();
};
});
},
/*
* 动画
*/
_animate: function(offset) {
var left = parseInt(this.$element.css('left')) + offset;
var _this = this;
if (offset > 0) {
offset = '+=' + offset;
} else {
offset = '-=' + Math.abs(offset);
}
this.$element.stop().animate({
'left': offset
}, 300);
},
//计算宽度
_calculationWidth: function(len, width) {
this.$element.width(len * width);
},
//resize
resize: function() {
this.width = this.$lis.width() + parseInt(this.$lis.css("margin-right"));
if (this.options.itemClass != '') {
this.len = this.$element.find("li." + this.options.itemClass).length;
} else {
this.len = this.$element.find("li").length;
}
this._calculationWidth(this.len, this.width);
this.$element.css({
'left': -(this.index - 1) * this.width
});
}
};
function Plugin(option, _relatedTarget) {
return this.each(function() {
var $this = $(this);
var data = $this.data('yoho.ImgSlider');
var options = $.extend({}, ImgSlider.DEFAULTS, $this.data(), typeof option == 'object' && option);
// 如果没有初始化，则初始化该对象，并且把该对象绑定到此元素的yoho.PicSilder属性下。
if (!data) $this.data('yoho.ImgSlider', (data = new ImgSlider(this, options)));
// 如果传递的options是一个字符串，则表示调用改对象的原型方法。
if (typeof option == 'string') data[option](_relatedTarget);
});
};
$.fn.imgSlider = Plugin;
$.fn.imgSlider.Constructor = ImgSlider;
})($);