/**
************************************************************
***@project jquery瀑布流插件
***@author acyy
***@ver version 1.0
************************************************************
*/
(function ($) {
var
//参数
setting = {
column_width: 243, //列宽
column_className: 'waterfall_column', //列的类名
column_space: 0, //列间距
cell_selector: 'li', //要排列的砖块的选择器，context为整个外部容器
img_selector: 'img', //要加载的图片的选择器
auto_imgHeight: true, //是否需要自动计算图片的高度
load_complete: true, //当前加载是否完成
fadein: true, //是否渐显载入
fadein_speed: 600, //渐显速率，单位毫秒
insert_type: 2, //单元格插入方式，1为插入最短那列，2为按序轮流插入
getResource: function (index) { } //获取动态资源函数,必须返回一个砖块元素集合,传入参数为加载的次数
},
//
waterfall = $.waterfall = {}, //对外信息对象
$container = null; //容器
waterfall.load_index = 0, //加载次数
$.fn.extend({
waterfall: function (opt) {
opt = opt || {};
setting = $.extend(setting, opt);
$container = waterfall.$container = $(this);
waterfall.$columns = creatColumn();
render($(this).find(setting.cell_selector).detach(), false); //重排已存在元素时强制不渐显
waterfall._scrollTimer2 = null;
$(window).bind('scroll', function () {
clearTimeout(waterfall._scrollTimer2);
waterfall._scrollTimer2 = setTimeout(onScroll, 10);
});
waterfall._scrollTimer3 = null;
$(window).bind('resize', function () {
clearTimeout(waterfall._scrollTimer3);
waterfall._scrollTimer3 = setTimeout(onResize, 10);
});
}
});
function creatColumn() {//创建列
waterfall.column_num = calculateColumns(); //列数
//循环创建列
var html = '';
for (var i = 0; i < waterfall.column_num; i++) {
html += '<div class="' + setting.column_className + '" style="width:' + setting.column_width + 'px; display:inline-block; *display:inline;zoom:1; margin-left:' + setting.column_space / 2 + 'px;margin-right:' + setting.column_space / 2 + 'px; vertical-align:top; overflow:hidden"></div>';
}
$container.prepend(html); //插入列
return $('.' + setting.column_className, $container); //列集合
}
function calculateColumns() {//计算需要的列数
var num = Math.floor(($container.innerWidth()) / (setting.column_width + setting.column_space));
if (num < 1) { num = 1; } //保证至少有一列
return num;
}
function render(elements, fadein) {//渲染元素
setting.load_complete = false;
if (!$(elements).length) { return; }
else { //没有元素
var $columns = waterfall.$columns;
$(elements).each(function (i) {
if (!setting.auto_imgHeight || setting.insert_type == 2) {//如果给出了图片高度，或者是按顺序插入，则不必等图片加载完就能计算列的高度了
if (setting.insert_type == 1) {
insert($(elements).eq(i), setting.fadein && fadein); //插入元素
} else if (setting.insert_type == 2) {
insert2($(elements).eq(i), i, setting.fadein && fadein); //插入元素
}
return true; //continue
}
if ($(this)[0].nodeName.toLowerCase() == 'img' || $(this).find(setting.img_selector).length > 0) {//本身是图片或含有图片
var image = new Image;
var src = $(this)[0].nodeName.toLowerCase() == 'img' ? $(this).attr('src') : $(this).find(setting.img_selector).attr('src');
image.onload = function () {//图片加载后才能自动计算出尺寸
image.onreadystatechange = null;
if (setting.insert_type == 1) {
insert($(elements).eq(i), setting.fadein && fadein); //插入元素
} else if (setting.insert_type == 2) {
insert2($(elements).eq(i), i, setting.fadein && fadein); //插入元素
}
image = null;
}
image.onreadystatechange = function () {//处理IE等浏览器的缓存问题：图片缓存后不会再触发onload事件
if (image.readyState == "complete") {
image.onload = null;
if (setting.insert_type == 1) {
insert($(elements).eq(i), setting.fadein && fadein); //插入元素
} else if (setting.insert_type == 2) {
insert2($(elements).eq(i), i, setting.fadein && fadein); //插入元素
}
image = null;
}
}
image.src = src;
} else {//不用考虑图片加载
if (setting.insert_type == 1) {
insert($(elements).eq(i), setting.fadein && fadein); //插入元素
} else if (setting.insert_type == 2) {
insert2($(elements).eq(i), i, setting.fadein && fadein); //插入元素
}
}
});
setting.load_complete = true;
}
}
function public_render(elems) {//ajax得到元素的渲染接口
render(elems, true);
} function insert($element, fadein) {//把元素插入最短列
if (fadein) {//渐显
$element.css('opacity', 0).appendTo(waterfall.$columns.eq(calculateLowest())).fadeTo(setting.fadein_speed, 1);
} else {//不渐显
$element.appendTo(waterfall.$columns.eq(calculateLowest()));
}
}
function insert2($element, i, fadein) {//按序轮流插入元素
if (fadein) {//渐显
$element.css('opacity', 0).appendTo(waterfall.$columns.eq(i % waterfall.column_num)).fadeTo(setting.fadein_speed, 1);
} else {//不渐显
$element.appendTo(waterfall.$columns.eq(i % waterfall.column_num));
}
}
function calculateLowest() {//计算最短的那列的索引
var min = waterfall.$columns.eq(0).outerHeight(), min_key = 0;
waterfall.$columns.each(function (i) {
if ($(this).outerHeight() < min) {
min = $(this).outerHeight();
min_key = i;
}
});
return min_key;
}
function getElements() {//获取资源
if (setting.load_complete) {
$.waterfall.load_index++;
return setting.getResource($.waterfall.load_index, public_render);
}
}
waterfall._scrollTimer = null; //延迟滚动加载计时器
function onScroll() {//滚动加载
clearTimeout(waterfall._scrollTimer);
waterfall._scrollTimer = setTimeout(function () {
var $lowest_column = waterfall.$columns.eq(calculateLowest()); //最短列
var bottom = $lowest_column.offset().top + $lowest_column.outerHeight(); //最短列底部距离浏览器窗口顶部的距离
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop || 0; //滚动条距离
var windowHeight = document.documentElement.clientHeight || document.body.clientHeight || 0; //窗口高度
if (scrollTop >= bottom - windowHeight) {
render(getElements(), true);
}
}, 10);
}
function onResize() {//窗口缩放时重新排列
if (calculateColumns() == waterfall.column_num) return; //列数未改变，不需要重排
var $cells = waterfall.$container.find(setting.cell_selector);
waterfall.$columns.remove();
waterfall.$columns = creatColumn();
render($cells, false); //重排已有元素时强制不渐显
}
})(jQuery);<script type="text/javascript">
$(function () {
var opt = {
column_width: 247,
getResource: function (index, render) {
$.ajax({
type: "GET",
url: "/Ajax/GoodsListWaterFall.ashx",
cache: false,
data: "propertyValues=<%=propertyValues %>&fallIndex=" + index + "",
dataType: "html",
async: true,
timeout: 60000,
success: function (data) {
render(data);
colorSelect();
} });
}
}
$('#list').waterfall(opt);
});
</script>
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