如何按字母顺序对 select2（jQuery 插件）选项进行排序？

Question

我想按字母顺序对 select2 选项进行排序。我有以下代码，想知道如何实现：

<select name="list" id="mylist" style="width:140px;">
   <option>United States</option>
   <option>Austria</option>
   <option>Alabama</option>    
   <option>Jamaica</option>
   <option>Taiwan</option>
   <option>canada</option>
   <option>palau</option>
   <option>Wyoming</option>
</select>


$('#mylist').select2({
  sortResults: function(results) { return results.sort(); } 
});

我想通过'text'对数据进行排序。

Answer 1

选择2 API v3.x (sortResults)

您可以使用 sortResults 回调选项对元素进行排序 String.localeCompare():

$( '#mylist' ).select2({
  /* Sort data using localeCompare */
  sortResults: data => data.sort((a, b) => a.text.localeCompare(b.text)),
});

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/3.5.4/select2.min.css" integrity="sha256-ijlUKKj3hJCiiT2HWo1kqkI79NTEYpzOsw5Rs3k42dI=" crossorigin="anonymous" /><script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/select2/3.5.4/select2.min.js" integrity="sha256-7A2MDY2eGSSUvgfbuH1IdzYk8qkEd3uzwiXADqPDdtY=" crossorigin="anonymous"></script>
<select name="list" id="mylist" style="width:140px;">
   <option>United States</option>
   <option>Austria</option>
   <option>Alabama</option>    
   <option>Jamaica</option>
   <option>Taiwan</option>
   <option>canada</option>
   <option>palau</option>
   <option>Wyoming</option>
</select>

选择2 API v4.0 (sorter)

您可以使用 sorter 回调选项对元素进行排序：

$('#mylist').select2({
    sorter: data => data.sort((a, b) => a.text.localeCompare(b.text)),
});

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/css/select2.css" integrity="sha256-xqxV4FDj5tslOz6MV13pdnXgf63lJwViadn//ciKmIs=" crossorigin="anonymous" /><script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/js/select2.min.js" integrity="sha256-FA14tBI8v+/1BtcH9XtJpcNbComBEpdawUZA6BPXRVw=" crossorigin="anonymous"></script>
<select name="list" id="mylist" style="width:140px;">
   <option>United States</option>
   <option>Austria</option>
   <option>Alabama</option>    
   <option>Jamaica</option>
   <option>Taiwan</option>
   <option>canada</option>
   <option>palau</option>
   <option>Wyoming</option>
</select>

---

没有jQuery

我有另一种通用方法（您可以使用值或属性对元素进行排序）而不使用 jQuery：

var select = document.getElementById("mylist");
var options = [];
// Get elements to sort
document.querySelectorAll('#mylist > option').forEach(
  option => options.push(option)
);
// Empty select
while (select.firstChild) {
    select.removeChild(select.firstChild);
}
// Sort array using innerText (of each option node)
options.sort(
  (a, b) => a.innerText.localeCompare(b.innerText)
);
// Add the nodes again in order
for (var i in options) {
    select.appendChild(options[i]);
}

<select name="list" id="mylist" style="width:140px;">
   <option>United States</option>
   <option>Austria</option>
   <option>Alabama</option>    
   <option>Jamaica</option>
   <option>Taiwan</option>
   <option>canada</option>
   <option>palau</option>
   <option>Wyoming</option>
</select>

和jQuery

感谢 @Narendra Sisodia 的 jQuery 提示：

/* Get options */
var selectList = $('#mylist > option');
/* Order by innerText (case insensitive) */
selectList.sort(
  (a, b) => a.innerText.localeCompare(b.innerText)
);
/* Re-do select HTML */
$('#mylist').html(selectList);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>
<select name="list" id="mylist" style="width:140px;">
   <option>United States</option>
   <option>Austria</option>
   <option>Alabama</option>    
   <option>Jamaica</option>
   <option>Taiwan</option>
   <option>canada</option>
   <option>palau</option>
   <option>Wyoming</option>
</select>

Answer 2

Select2 4.0 版已将 sortResults 重命名为 sorter，因此您可以：

$('#input').select2({
    sorter: function(data) {
        return data.sort();
    }
})

Answer 3

看看这段代码：

$('#your_select').select2({
     /* Sort data using lowercase comparison */
     sorter: data => data.sort((a,b) => a.text.toLowerCase() > b.text.toLowerCase() ? 0 : -1)

});

希望对您有所帮助！ =)

Answer 4

这是从 github 期中摘录的，所以所有功劳都归功于原始发帖者，但这对我有用。

版本4.x

$( '#mylist' ).select2({
  sorter: function(data) {
    return data.sort(function (a, b) {
        if (a.text > b.text) {
            return 1;
        }
        if (a.text < b.text) {
            return -1;
        }
        return 0;
    });
  }
});