Question

在最初隐藏的具有多个属性的<select>上使用Select2时，占位符不会显示。查看代码，我可以看到选择器.select2-container--default .select2-search--inline .select2-search__field的宽度为0px（猜测因为它是隐藏的）。

$('[data-trigger="open"]').on('click', function(){
	$('[data-target="open"]').toggleClass('hidden');
})

$('.select2').select2({
	width: '100%'
});

.hidden {
  display:none;
}

<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/css/select2.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/js/select2.min.js"></script>

<p><a href="#" data-trigger="open">Open Select2 and watch no placeholder...</a></p>
<div class="hidden" data-target="open">
  <select name="select" id="select" class="select2" multiple data-placeholder="Select one or more...">
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
    <option value="3">Option 3</option>
  </select>
</div>

强制width: 100% !important CSS规则只能部分解决问题：占位符显示但输入字段对每个项目选择都会增长太多

$('[data-trigger="open"]').on('click', function(){
	$('[data-target="open"]').toggleClass('hidden');
})

$('.select2').select2({
	width: '200px' // limit size to make the "growing "problem appear
});

.hidden {
  display:none;
}

.select2-container--default .select2-search--inline .select2-search__field {
  width: 100% !important;
}

<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/css/select2.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/js/select2.min.js"></script>

<p><a href="#" data-trigger="open">Open Select2: placeholder ok, but field grows abnormally when inserting items...</a></p>
<div class="hidden" data-target="open">
  <select name="select" id="select" class="select2" multiple data-placeholder="Select one or more...">
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
    <option value="3">Option 3</option>
  </select>
</div>

请帮忙吗？

Answer 1

在CSS下方添加到您的页面

.select2-selection--multiple .select2-search__field{
  width:100%!important;
}

Answer 2

问题是，如果默认情况下div被隐藏，则会删除占位符。

请看下面的例子。

＆＃13;

$('[data-trigger="open"]').on('click', function() {
  $('[data-target="open"]').toggleClass('hidden');
})

$('.select2').select2({
  width: '100%',
  placeholder: function() {
    $(this).data('placeholder');
  }
});

$('.select2').parent().addClass("hidden")

＆＃13;

.hidden {
  display: none;
}

＆＃13;

<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/css/select2.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/js/select2.min.js"></script>

<p><a href="#" data-trigger="open">Open Select2 and watch no placeholder...</a></p>
<div class="" data-target="open">
  <select name="select" id="select" class="select2" multiple data-placeholder="Select one or more...">
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
    <option value="3">Option 3</option>
  </select>
</div>

＆＃13;

如果最初隐藏，则Select2不显示占位符

2 个答案: