Bootstrap: 如何让一个元素垂直居中

Question

我正在做一个主要在移动设备上显示的网站。我正在使用 bootstrap 4.

目前我正在尝试显示一个必须 "vertically" 位于可用 space 中心的元素。

我的意思是：我有一个标题，它使用固定大小，我在 div 中有一个消息 + 2 个按钮，我需要在可用的垂直中间显示space（无溢出）。

我发现了这个：vertical-align with Bootstrap 3 --> bootstrap 4 片段不起作用另一个关于灵活盒子的答案很有希望，但似乎如果我只有一个组件应该使用所有剩余的 space 它不起作用。

另外，一件事；我需要垂直对齐的元素通过 jquery 调用显示：

$('#btToShow').click(function(){
   $('#card-container').fadeOut(200, function(){$('#wait-for-result-container').fadeIn();});
});

$('#change-choice').click(function(){
   $('#wait-for-result-container').fadeOut(200, function(){$('#card-container').fadeIn();});
});

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <title>Some page</title>

    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ"
        crossorigin="anonymous">
</head>

<body>
    <H1 class="text-center page-header">Somelist</H1>
    <div id="card-container" class="container show center-block">
        <div id="card-subcontainer" class="row center-block">
          <!-- Here there is normally a lot of buttons -->
          <button class="btn" id="btToShow">Show</button>
        </div>
    </div>

    <div id="wait-for-result-container" class="container center-block text-center m-7" style="display: none;">
            <h2>This is the part that is absolutely not vertically aligned</h2>
            <div>
                <button class="btn btn-primary btn-lg">Wait for it...</button>
                <button id="change-choice" class="btn btn-danger">Change the choice</button>
            </div>
    </div>



<script src="https://code.jquery.com/jquery-3.1.1.min.js"     crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb"
    crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn"
    crossorigin="anonymous"></script>
<!--<script src="https://cdnjs.cloudflare.com/ajax/libs/mdbootstrap/4.2.0/js/mdb.min.js" crossorigin="anonymous"></script>-->
</body>

</html>

知道如何在中间垂直对齐 #wait-for-result-container 的内容吗？

Answer 1

您可以使用 flexbox 将内容垂直居中

#wait-for-result-container {
 display: flex;
 align-items: center;
 justify-content: center;
 height: 100vh;
}

codePen

使用 display: flex

淡入

$("#wait-for-result-container")
    .css("display", "flex")
    .hide()
    .fadeIn();

Answer 2

你可以绝对定位它：

#wait-for-result-container {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
}

$('#btToShow').click(function(){
   $('#card-container').fadeOut(200, function(){$('#wait-for-result-container').fadeIn();});
});

$('#change-choice').click(function(){
   $('#wait-for-result-container').fadeOut(200, function(){$('#card-container').fadeIn();});
});

#wait-for-result-container {
  position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <title>Some page</title>

    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ"
        crossorigin="anonymous">
</head>

<body>
    <H1 class="text-center page-header">Somelist</H1>
    <div id="card-container" class="container show center-block">
        <div id="card-subcontainer" class="row center-block">
          <!-- Here there is normally a lot of buttons -->
          <button class="btn" id="btToShow">Show</button>
        </div>
    </div>

    <div id="wait-for-result-container" class="container center-block text-center m-7" style="display: none;">
            <h2>This is the part that is absolutely not vertically aligned</h2>
            <div>
                <button class="btn btn-primary btn-lg">Wait for it...</button>
                <button id="change-choice" class="btn btn-danger">Change the choice</button>
            </div>
    </div>



<script src="https://code.jquery.com/jquery-3.1.1.min.js"     crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb"
    crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn"
    crossorigin="anonymous"></script>
<!--<script src="https://cdnjs.cloudflare.com/ajax/libs/mdbootstrap/4.2.0/js/mdb.min.js" crossorigin="anonymous"></script>-->
</body>

</html>

Answer 3

此方法非常适用于 Bootstrap 3.x:

#wait-for-result-container {
  position:absolute;
  left:0;
  right:0;
  top:50%;
  -webkit-transform:translateY(-50%) !important;
  -ms-transform:translateY(-50%) !important;
  transform:translateY(-50%) !important;
}

top:50% 设置 div 容器下方 1/2 处的位置，然后 transform:translateY(-50%) 将其向上移动一半的距离，使对象相对于父容器。

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