Question

我使用select2插件进行选择下拉列表。我在页面中有多个选择下拉框，我需要将浮动标签应用于选定的下拉列表。

我尝试过谷歌但是我找不到任何预期的结果。

我提供了迄今为止我尝试过的代码。

HTML

<div class="container">
  <div class="row">
    <div class="col-md-6 col-lg-6 col-sm-6">
      <label class="hor-menu visible-xs visible-xs control-label col-sm-1"></label>
      <div class="form-group form-md-line-input form-md-floating-label" style="margin-top: 13px;">
        <select name="cboNGrp" id="cboNGrp" class="form-control select2me input-xlarge" data-live-search="true" data-size="8"></select>
        <label class="form_control_1 head_ctrl_label" style="padding-top: 2px;">Type</label>
      </div>
    </div>
    <div class="col-md-6 col-lg-6 col-sm-6">
      <div class="form-group form-md-line-input head_ctrl">
        <label class="hor-menu visible-xs visible-xs control-label  col-sm-1"></label>
        <select name="cboEmrGrp" id="cboEmrGrp" class="select2me form-control input-xlarge"></select>
        <label class="form_control_1 head_ctrl_label">E / M</label>
      </div>
    </div>
  </div>
</div>

JS

$('.select2me').click(function(e){
    if($(this).find('select2-dropdown-open')) {
        $('label.head_ctrl_label').css('margin-top', '-25px'); 
    }
    e.preventDefault();
});

Image showing user clicks the Dropdown to select Option

Image showing the bug floating label applies to all the dropdown not only selected one

Answer 1

尝试以下

$('.select2me').click(function(e){
   if($(this).find('select2-dropdown-open')) {
      $(this).next('.head_ctrl_label').css('margin-top', '-25px'); }
      e.preventDefault();
});

Answer 2

希望这对您有帮助！

$('select').select2().on('select2:open', (elm) => {
    const targetLabel = $(elm.target).prev('label');
    targetLabel.addClass('selected');
}).on('select2:close', (elm) => {
    const target = $(elm.target);
    const targetLabel = target.prev('label');
    const targetOptions = $(elm.target.selectedOptions);
    if (targetOptions.length === 0) {
        targetLabel.removeClass('selected');
    }
});

SCSS

label {
    &.selected {
        top: 0;
        font-size: 11px;
        transform: translateY(0);
    }
    font-size: 16px;
    color: #dfdfdf;
    position: absolute;
    z-index: 1;
    top: 50%;
    left: 15px;
    transform: translateY(-50%);
    transition: all 0.2s ease 0s;
}

Code pen explanation

如何将浮动标签应用于select2下拉列表？

2 个答案: