Select2下拉菜单点击后叠加效果答案

【问题标题】：Select2 dropdown menu with overlay effect after clickSelect2下拉菜单点击后叠加效果
【发布时间】：2023-02-18 02:05:33
【问题描述】：

我想自定义使用“Select2”库创建的下拉菜单。

我试图在菜单打开时创建叠加效果，但我失败了。

有没有人可以帮助我？

谢谢

我想在单击后获得放置在视口中心的下拉菜单，并在菜单打开时在背景中获得“叠加效果”。因此，所有屏幕都变得有些暗，用户只能关注下拉菜单。

点击选项后，背景叠加效果和下拉菜单消失。点击下拉菜单外后叠加效果和下拉菜单消失

下面是我写的代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <link 
        href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/css/select2.min.css" 
        rel="stylesheet"
    />

    <script 
        src="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js">
    </script>

    <style>
        
        .box {
            position: fixed;
            top: 80%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        .select2-selection {
            background-color: aqua !important;
            border-radius: 10px !important;
        }
          
        .select2-dropdown {
            background-color: red !important;
            position: fixed !important;
            top: 50% !important;
            left: 50% !important;
            transform: translate(-50%, -50%) !important;
            
        }
    
    </style>

</head>


<body>
    
        <div class="box">
            <select id="my-select" style="width: 200px">
                <option value="option1">Option 1</option>
                <option value="option2">Option 2</option>
                <option value="option3">Option 3</option>
            </select>
        </div>
    


<!-- jQuery -->
<script 
    type='text/javascript'
    src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.3/jquery.min.js">
</script>

<!-- Select2 CSS -->
<link 
    href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/css/select2.min.css" 
    rel="stylesheet"
/>

<!-- Select2 JS -->
<script 
    src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/js/select2.min.js">
</script>

    
<script> 

    $(document).ready(function(){

        $('#my-select').select2({
        
        
        });
    
    });

</script>

</body>
</html>

【问题讨论】：

标签： javascript css jquery-select2

【解决方案1】：

您可以使用 select2:open 和 select2:close 来触发选择打开和关闭的事件，然后在您的 select2 容器上应用类 ovelay 这是一个示例：

$(document).ready(function(){
  $('#my-select').select2({});
  
  $('#my-select').on('select2:open', function (e) {
    $('#container').addClass("overlay");
  });
  
  $('#my-select').on('select2:close', function (e) {
    $('#container').removeClass("overlay");
  });
});

.container {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    width: 100%;
    overflow: hidden;
}

.overlay {
    background: #3a1d1d;
    background: linear-gradient(rgb(72,0,72,0.8), rgb(192,72,72,0.8)), #766767);
    background: linear-gradient(rgb(72,0,72,0.8), rgb(192,72,72,0.8)), #362929);
    background-size: cover;
    background-repeat: no-repeat;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!DOCTYPE html>
<html lang="en">
  <head>
      <meta charset="UTF-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>Document</title>

      <link ref="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/css/select2.min.css" rel="stylesheet" />

      <script src="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js">
      </script>
  </head>

  <body>
      <div class="container" id="container">
          <div class="box">
              <select id="my-select" style="width: 200px">
                  <option value="option1">Option 1</option>
                  <option value="option2">Option 2</option>
                  <option value="option3">Option 3</option>
              </select>
          </div>
      </div>


      <!-- jQuery -->
      <script type='text/javascript' rc="https://ajax.googleapis.com/ajax/libs/jquery/3.6.3/jquery.min.js">
      </script>

      <!-- Select2 CSS -->
      <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/css/select2.min.css" rel="stylesheet" />

      <!-- Select2 JS -->
      <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/js/select2.min.js">
      </script>
  </body>
</html>

【讨论】：