选择二 - 在选择，从下一个选择元素

Question

删除禁用的属性我使用Select2的风格我选择的元素，我想有它使所有，但第一个下拉列表被禁用开始，然后当一个选项是从选定的第一个下拉列表中，禁用的属性将从下一个下拉列表中移除（强制用户按顺序进行选择）。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')似乎并没有被瞄准的下一个元素。

Answer 1

使用.nextAll()和.first()代替.next()，其中仅“[变得]紧接在后面的各元素的同级集合中匹配的元素”和optionaly 滤波器，通过一个选择器。

之所以只是.next()不起作用，是因为跨度是通过select2在<select>之间注入的。

$('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>