瀑布流布局，听起来听牛逼的样子，其实就是简单的子元素筛选功能。不过这一功能在网站页面布局当中还是很常用的，特别是在电商网站中
经常会有点一个钮筛选，然后页面的子元素刷的以下变了样。接下来，我们先简单介绍下概念和用法，然后详解这一功能的实现。
瀑布流概念：
又称瀑布流式布局，是比较流行的一种网站页面布局方式。视觉表现为多栏布局，附带筛选功能，当下在国内十分流行。
瀑布流原理：
通过为子元素定义不同的class类名，然后通过类名及其内容进行筛选排序。
这一插件在实现网站元素动态切换，调整整体顺序方面十分实用。但是帅选的功能只能由程序员设置，用户无法自定义设置。
接下来我们看一段代码，及效果演示，具体了解插件的用法（代码可直接黏贴运行，但是需要下载对应js文件）
<!doctype html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Isotope-jQuery神奇的分类过滤和排序插件</title>
</head>
<body>
<div class="htmleaf-container"> <h2>以下是筛选功能</h2> <div id="filters" class="button-group"> <button class="button is-checked" data-filter="*">显示所有</button>
<button class="button" data-filter=".metal">金属</button>
<button class="button" data-filter=".transition">过渡元素</button>
<button class="button" data-filter=".alkali, .alkaline-earth">碱及碱金属</button>
<button class="button" data-filter=":not(.transition)">过渡元素</button>
<button class="button" data-filter=".metal:not(.transition)">非碱金属</button>
<button class="button" data-filter="numberGreaterThan50">序号小于50</button>
<button class="button" data-filter="ium">名字以ium结尾</button>
</div> <h2>以下是重新排序功能</h2>
<div id="sorts" class="button-group"> <button class="button is-checked" data-sort-by="original-order">默认顺序</button>
<button class="button" data-sort-by="name">名字排序</button>
<button class="button" data-sort-by="symbol">符号</button>
<button class="button" data-sort-by="number">数字</button>
<button class="button" data-sort-by="weight">质量</button>
<button class="button" data-sort-by="category">种类</button>
</div> <div class="isotope">
<div class="element-item transition metal " data-category="transition">
<h3 class="name">Mercury</h3>
<p class="symbol">Hg</p>
<p class="number">80</p>
<p class="weight">200.59</p>
</div>
<div class="element-item metalloid " data-category="metalloid">
<h3 class="name">Tellurium</h3>
<p class="symbol">Te</p>
<p class="number">52</p>
<p class="weight">127.6</p>
</div>
<div class="element-item post-transition metal " data-category="post-transition">
<h3 class="name">Bismuth</h3>
<p class="symbol">Bi</p>
<p class="number">83</p>
<p class="weight">208.980</p>
</div>
<div class="element-item post-transition metal " data-category="post-transition">
<h3 class="name">Lead</h3>
<p class="symbol">Pb</p>
<p class="number">82</p>
<p class="weight">207.2</p>
</div>
<div class="element-item transition metal " data-category="transition">
<h3 class="name">Gold</h3>
<p class="symbol">Au</p>
<p class="number">79</p>
<p class="weight">196.967</p>
</div>
<div class="element-item alkali metal " data-category="alkali">
<h3 class="name">Potassium</h3>
<p class="symbol">K</p>
<p class="number">19</p>
<p class="weight">39.0983</p>
</div>
<div class="element-item alkali metal " data-category="alkali">
<h3 class="name">Sodium</h3>
<p class="symbol">Na</p>
<p class="number">11</p>
<p class="weight">22.99</p>
</div>
<div class="element-item transition metal " data-category="transition">
<h3 class="name">Cadmium</h3>
<p class="symbol">Cd</p>
<p class="number">48</p>
<p class="weight">112.411</p>
</div>
<div class="element-item alkaline-earth metal " data-category="alkaline-earth">
<h3 class="name">Calcium</h3>
<p class="symbol">Ca</p>
<p class="number">20</p>
<p class="weight">40.078</p>
</div>
<div class="element-item transition metal " data-category="transition">
<h3 class="name">Rhenium</h3>
<p class="symbol">Re</p>
<p class="number">75</p>
<p class="weight">186.207</p>
</div>
<div class="element-item post-transition metal " data-category="post-transition">
<h3 class="name">Thallium</h3>
<p class="symbol">Tl</p>
<p class="number">81</p>
<p class="weight">204.383</p>
</div>
<div class="element-item metalloid " data-category="metalloid">
<h3 class="name">Antimony</h3>
<p class="symbol">Sb</p>
<p class="number">51</p>
<p class="weight">121.76</p>
</div>
<div class="element-item transition metal " data-category="transition">
<h3 class="name">Cobalt</h3>
<p class="symbol">Co</p>
<p class="number">27</p>
<p class="weight">58.933</p>
</div>
<div class="element-item lanthanoid metal inner-transition " data-category="lanthanoid">
<h3 class="name">Ytterbium</h3>
<p class="symbol">Yb</p>
<p class="number">70</p>
<p class="weight">173.054</p>
</div>
<div class="element-item noble-gas nonmetal " data-category="noble-gas">
<h3 class="name">Argon</h3>
<p class="symbol">Ar</p>
<p class="number">18</p>
<p class="weight">39.948</p>
</div>
<div class="element-item diatomic nonmetal " data-category="diatomic">
<h3 class="name">Nitrogen</h3>
<p class="symbol">N</p>
<p class="number">7</p>
<p class="weight">14.007</p>
</div>
<div class="element-item actinoid metal inner-transition " data-category="actinoid">
<h3 class="name">Uranium</h3>
<p class="symbol">U</p>
<p class="number">92</p>
<p class="weight">238.029</p>
</div>
<div class="element-item actinoid metal inner-transition " data-category="actinoid">
<h3 class="name">Plutonium</h3>
<p class="symbol">Pu</p>
<p class="number">94</p>
<p class="weight">(244)</p>
</div>
</div>
</div> <script src='js/jquery-1.10.2.js'>
</script><script src='js/isotope.pkgd.min.js'></script>
<script>
$(function () {
var $container = $('.isotope').isotope({
itemSelector: '.element-item',
layoutMode: 'fitRows',
getSortData: {
name: '.name',
symbol: '.symbol',
number: '.number parseInt',
category: '[data-category]',
weight: function (itemElem) {
var weight = $(itemElem).find('.weight').text();
return parseFloat(weight.replace(/[\(\)]/g, ''));
}
}
});
var filterFns = {
numberGreaterThan50: function () {
var number = $(this).find('.number').text();
return parseInt(number, 10) > 50;
},
ium: function () {
var name = $(this).find('.name').text();
return name.match(/ium$/);
}
};
$('#filters').on('click', 'button', function () {
var filterValue = $(this).attr('data-filter');
filterValue = filterFns[filterValue] || filterValue;
$container.isotope({ filter: filterValue });
});
$('#sorts').on('click', 'button', function () {
var sortByValue = $(this).attr('data-sort-by');
$container.isotope({ sortBy: sortByValue });
});
$('.button-group').each(function (i, buttonGroup) {
var $buttonGroup = $(buttonGroup);
$buttonGroup.on('click', 'button', function () {
$buttonGroup.find('.is-checked').removeClass('is-checked');
$(this).addClass('is-checked');
});
});
});
</script>
</body>
</html>
然后看一下效果图：
接下爱来咱们说说插件的使用，以下代码时进行子元素筛选的，直接设置 data-filter 的值就可以了，这相当于是说你创建了一个类别，二者
个类别中的元素，只要他们具备 class 有这个类别的名字就可以了，当你点击对应按钮时，子元素就会自动变化筛选。
<div id="filters" class="button-group"> <button class="button is-checked" data-filter="*">显示所有</button>
<button class="button" data-filter=".metal">金属</button>
<button class="button" data-filter=".transition">过渡元素</button>
<button class="button" data-filter=".alkali, .alkaline-earth">碱及碱金属</button>
<button class="button" data-filter=":not(.transition)">过渡元素</button>
<button class="button" data-filter=".metal:not(.transition)">非碱金属</button>
<button class="button" data-filter="numberGreaterThan50">序号小于50</button>
<button class="button" data-filter="ium">名字以ium结尾</button>
</div>
而下述代码是实现子元素排序功能的，用 data-sort-by 定义好你要按什么规则筛选，这个插件自带了 name 按首字母
ascill值排序，number 按数值大小排序等。也可以自定义排序的方式，在js中修改即可。
<div id="sorts" class="button-group"> <button class="button is-checked" data-sort-by="original-order">默认顺序</button>
<button class="button" data-sort-by="name">名字排序</button>
<button class="button" data-sort-by="symbol">符号</button>
<button class="button" data-sort-by="number">数字</button>
<button class="button" data-sort-by="weight">质量</button>
<button class="button" data-sort-by="category">种类</button>
</div>
子元素中，用大div将整个子元素内容包裹起来，根据类名与 data-sort-by 的对应关系，实现筛选。data-category="transition"也是
筛选用的，因为有时一个子元素同时会有2个下海选的类名，这个属性是为他设置一个最为优先的类别，避免冲突。
而子元素当中众多的p标签啥的，都不是关键，关键看class类名，是什么标签无所谓，只要有与上述代码对应的类名，就可以根据对应标签
里的text内容进行排序
<div class="element-item transition metal " data-category="transition">
<h3 class="name">Mercury</h3>
<p class="symbol">Hg</p>
<p class="number">80</p>
<p class="weight">200.59</p>
</div>
而js代码可以直接黏贴这段自执行函数，就可以实现想要的功能。
对于此插件的js文档请到我个人主页的文件中下载。