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// $('#single-posts').fixbox({});//初始化
// $("#single-posts").fixbox("show");//外部调用插件里的方法
(function ($, window, document, undefined) {
var $win = $(window);
var $document = $(document);
/**
* @constructor FixBox
* 创建一个新的的 FixBox 类.
* @param {Object} element DOM元素.
* @param {Object} options 插件配置 .
* @type {Object}
* @example new FixBox( this , options)
* */
var FixBox = function (element, options) {
this.initialize('fixbox', element, options);
};
/**
* This is a property of class FixBox
*/
FixBox.prototype = {
constructor:FixBox,
/**
* 初始化
* @classDescription 初始化
* @param {String} type 跟随类型
* @param {Object} element 弹窗所依附的DOM元素.
* @param {Object} options 插件配置 .
*/
initialize:function (type, element, options) {
var _this = this;
this.type = type;
this.$element = $(element);
this.options = this.options || this.getOptions(options);
this.winH = $win.height();
this.winW = $win.width();
if (this.options.isFixdeHeight) {
this.fixedBoxH = this.$element.outerHeight(true);
}
this.offsetT = this.$element.offset().top;
this.resizeWindow();
this.documentH = $document.height();
$win.bind("resize", function () {
_this.resizeWindow();
});
},
/**
* 初始化 配置参数 返回参数MAP
* @param {Object} options 插件配置 .
* @return {Object} 配置参数
*/
getOptions:function (options) {
options = $.extend({}, $.fn[this.type].defaults, this.$element.data(), options || {});
return options;
},
//resize Window和初始化的时候使用
resizeWindow:function () {
var options = this.options;
var _this = this;
this.winH = $win.height();
this.winW = $win.width();
if (this.winW >= options.pagewidth) {
this.doFix();
$win.unbind("." + options.scrollEventName);
$win.bind("scroll." + options.scrollEventName, function () {
_this.doFix();
});
} else {
$win.unbind("." + options.scrollEventName);
this.$element.css("position", "static");
}
},
//滚动
doFix:function () {
var $element = this.$element;
var options = this.options;
var distanceToBottom = options.distanceToBottom;
var distanceToTop = options.distanceToTop;
if (!this.options.isFixdeHeight) {
this.fixedBoxH = $element.outerHeight(true);
}
var fixedBoxH = this.fixedBoxH;
var offsetT = this.offsetT;
var fixedBoxPositionB = fixedBoxH + this.offsetT;//$fixedBox的底部位置 =fixedBox高度+fixedBox的offset().top
var winH = this.winH;
if (!options.isFixdeDocHeight) {
this.documentH = $document.height();
}
var documentH = this.documentH;
//console.log(fixedBoxPositionB+distanceToBottom-options.threshold)
var scrollNum = fixedBoxPositionB - winH;
var winST = $win.scrollTop();
//元素高度 小于 窗口减去离顶部的固定距离
if (fixedBoxH < (winH - distanceToTop)) {
//滚去的高度 大于 初始化时元素的top位置
if (winST > offsetT) {
//console.log(winH - distanceToBottom < fixedBoxH+distanceToTop)
if (winST >= ( documentH - distanceToBottom - fixedBoxH)) {
//if(this.winH-245 scrollNum) {
if (winST > ( documentH - winH - distanceToBottom)) {
$element.css({
"position":"fixed",
"top":-(winST + distanceToBottom + fixedBoxH - documentH)
});
} else {
$element.css({
"position":"fixed",
"top":winH - fixedBoxH
});
}
} else {
$element.css("position", "static");
}
}
}
};
$.fn.fixbox = function (option) {
var argumentsAry = [];
for (var i = 0, len = arguments.length; i < len; i++) {
argumentsAry.push(arguments[i]);
}
var newarg = argumentsAry.slice(1);
return this.each(function () {
var $this = $(this),
data = $this.data('fixbox'),
options = typeof option == 'object' && option;
if (!data) {
data = new FixBox(this, options);
$this.data('fixbox', data);
}
//如果 option是字符串，就运行类的这个方法
if (typeof argumentsAry[0] == 'string') {
data[argumentsAry[0]].apply(data, newarg);
}
});
};
$.fn.fixbox.Constructor = FixBox;
$.fn.fixbox.defaults = {
distanceToTop:0, // 节点上边到页面顶部的距离
distanceToBottom:0,//离底部空余多少时候停止跟随，其实还是fixed定位，只是改变top的值
isFixdeHeight:true,//跟随元素是不是固定高度
isFixdeDocHeight:true,//document是不是固定高度
pagewidth:960,//页面宽度，当窗口宽度 小于 页面宽度 的时候 元素不在跟随。
threshold:0, //阀值,一般小于等于元素的margin-top值，主要解决固定定位整个栏高度大于非固定定位栏的时候,这样就不固定定位了
scrollEventName:"followScroll"// scroll事件名，当元素不需要跟随的时候，可以解除对应的scroll事件
};
})(window.jQuery, window, document);