選擇二 - 在選擇，從下一個選擇元素

Question

刪除禁用的屬性我使用Select2的風格我選擇的元素，我想有它使所有，但第一個下拉列表被禁用開始，然後當一個選項是從選定的第一個下拉列表中，禁用的屬性將從下一個下拉列表中移除（強制用戶按順序進行選擇）。下面是我有：

$('select').select2(); 
 
$('select').prop('disabled', true); 
 
$('select:first-of-type').prop('disabled', false); 
 

 
$('select').on('select2:select', function(e) { 
 
    $(this).next('select').prop('disabled', false); // remove disabled prop from next select 
 
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.2/css/select2.min.css" rel="stylesheet"/> 
 
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.2/js/select2.min.js"></script> 
 

 
<select> 
 
    <option>Test 1</option> 
 
    <option>Test 2</option> 
 
    <option>Test 3</option> 
 
    <option>Test 4</option> 
 
</select> 
 

 
<select> 
 
    <option>Test 1</option> 
 
    <option>Test 2</option> 
 
    <option>Test 3</option> 
 
    <option>Test 4</option> 
 
</select> 
 

 
<select> 
 
    <option>Test 1</option> 
 
    <option>Test 2</option> 
 
    <option>Test 3</option> 
 
    <option>Test 4</option> 
 
</select>

不幸的是$(this).next('select')似乎並沒有被瞄準的下一個元素。

Answer 1

使用.nextAll()和.first()代替.next()，其中僅「[變得]緊接在後面的各元素的同級集合中匹配的元素」和optionaly 濾波器，通過一個選擇器。

之所以只是.next()不起作用，是因爲跨度是通過select2在<select>之間注入的。

$('select').select2(); 
 
$('select').prop('disabled', true); 
 
$('select:first-of-type').prop('disabled', false); 
 

 
$('select').on('select2:select', function(e) { 
 
    $(this).nextAll('select').first().prop('disabled', false); // remove disabled prop from next select 
 
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.2/css/select2.min.css" rel="stylesheet"/> 
 
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.2/js/select2.min.js"></script> 
 

 
<select> 
 
    <option>Test 1</option> 
 
    <option>Test 2</option> 
 
    <option>Test 3</option> 
 
    <option>Test 4</option> 
 
</select> 
 

 
<select> 
 
    <option>Test 1</option> 
 
    <option>Test 2</option> 
 
    <option>Test 3</option> 
 
    <option>Test 4</option> 
 
</select> 
 

 
<select> 
 
    <option>Test 1</option> 
 
    <option>Test 2</option> 
 
    <option>Test 3</option> 
 
    <option>Test 4</option> 
 
</select>

Answer 2

$('select').select2(); 
$('select').prop("disabled", true); 
$('select').eq(0).prop("disabled", false); 
$('select').on('select2:select', function(e) { 
    var index = $(this).index('select'); 
    $('select').eq(index + 1).prop("disabled", false); // remove disabled prop from next select 
}); 

Answer 3

$('select').select2({allowClear: true}); 
 
$('select').prop('disabled', true); 
 
$('select:first-of-type').prop('disabled', false); 
 

 
$('select').on('select2:select', function(e) { 
 
    $(this).nextAll('select').first().prop('disabled', false); // remove disabled prop from next select 
 
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.2/css/select2.min.css" rel="stylesheet"/> 
 
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.2/js/select2.min.js"></script> 
 

 
<select> 
 
    <option>Test 1</option> 
 
    <option>Test 2</option> 
 
    <option>Test 3</option> 
 
    <option>Test 4</option> 
 
</select> 
 

 
<select> 
 
    <option>Test 1</option> 
 
    <option>Test 2</option> 
 
    <option>Test 3</option> 
 
    <option>Test 4</option> 
 
</select> 
 

 
<select> 
 
    <option>Test 1</option> 
 
    <option>Test 2</option> 
 
    <option>Test 3</option> 
 
    <option>Test 4</option> 
 
</select>