按data-attribute对HTML元素进行排序

Question

我有以下标记:

<ul>
  <li class="category-item" data-category-group="jeans">Bottoms</li>
  <li class="category-item" data-category-group="tops">Shirt</li>
  <li class="category-item" data-category-group="jeans">Jeans</li>
  <li class="category-item" data-category-group="jeans">Shorts</li>
  <li class="category-item" data-category-group="tops">Hoodie</li>
  <li class="category-item" data-category-group="accesories">Sunglasses</li>
</ul>

元素在data-category-group属性中可以具有不同的组名.我希望能够对元素进行排序,以便具有牛仔裤组的元素将在DOM中相互追随.

我有一个想法,试图通过将HTML集合转换为数组然后对它们进行排序来解决这个问题.但它似乎无法以这种方式工作.

这是我的JavaScript:

var categoryItems = document.querySelectorAll("[data-category-group]");
var categoryItemsArray = Array.from(categoryItems)

document.getElementById("demo").innerHTML = categoryItemsArray;

function myFunction() {
    categoryItemsArray.sort();
    document.getElementById("demo").innerHTML = categoryItemsArray;
}

怎么能实现这一目标？

在这里查看一个codepen:https://codepen.io/fennefoss/pen/PBGrPZ

Answer 1

您可以(并且应该)使用Array#sort,只需传递一个检查data-category-group属性的函数:

var categoryItems = document.querySelectorAll("[data-category-group]");
var categoryItemsArray = Array.from(categoryItems);

let sorted = categoryItemsArray.sort(sorter);

function sorter(a,b) {
    if(a.dataset.categoryGroup < b.dataset.categoryGroup) return -1;
    if(a.dataset.categoryGroup > b.dataset.categoryGroup) return 1;
}

document.querySelector("button").onclick = () => sorted.forEach(e => document.querySelector("#demo").appendChild(e));

<ul id="demo">
  <li class="category-item" data-category-group="jeans">Bottoms</li>
  <li class="category-item" data-category-group="tops">Shirt</li>
  <li class="category-item" data-category-group="jeans">Jeans</li>
  <li class="category-item" data-category-group="jeans">Shorts</li>
  <li class="category-item" data-category-group="tops">Hoodie</li>
  <li class="category-item" data-category-group="accesories">Sunglasses</li>
</ul>


<button>Sort Elements</button>

Answer 2

您可以sort使用数组上的方法执行此操作，然后将元素追加到 ul.

let ul = document.querySelector("ul");
let li = ul.querySelectorAll("li");

let sorted = Array.from(li).sort((a, b) => {
  return (b.dataset.categoryGroup == 'jeans') - (a.dataset.categoryGroup == 'jeans')
})

ul.innerHTML = "";
sorted.forEach(e => ul.appendChild(e))

<ul>
  <li class="category-item" data-category-group="jeans">Bottoms</li>
  <li class="category-item" data-category-group="tops">Shirt</li>
  <li class="category-item" data-category-group="jeans">Jeans</li>
  <li class="category-item" data-category-group="jeans">Shorts</li>
  <li class="category-item" data-category-group="tops">Hoodie</li>
  <li class="category-item" data-category-group="accesories">Sunglasses</li>
</ul>