Twitter bootstrap 在引导4中从底部向上滑动的模式

我正在尝试设置一个从底部向上滑动的模式，但是对于Bootstrap4，还没有一个真正有效的教程。以下是一个尝试：

HTML

---

我将W3CSS框架与模态动画结合使用，它看起来是这样的，希望能有所帮助：

HTML:

<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<button type="submit" class="btn btn-block btn-default footer__btn" data-toggle="modal" data-target="#myModal2"> Open Modal</button>
<div class="modal fade" id="myModal2" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
  <div class="modal-dialog" role="document">
    <div class="modal-content w3-animate-bottom">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title" id="myModalLabel"> ABOUT </h4>
      </div>
      <div class="modal-body">
        CONTEÚDO
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>

      </div>
    </div>
  </div>
</div>

---

由于您不想在Bootstrap 4上添加另一个框架，我只是更改了CSS：

.animate-bottom {
  position: relative;
  animation: animatebottom 0.4s;
}

@keyframes animatebottom {
  from {
    bottom: -300px;
    opacity: 0;
  }

  to {
    bottom: 0;
    opacity: 1;
  }
}

然后只需在

开放模式
&时代；
关于
康泰多
接近

这是小提琴：

---

请确保它是跨浏览器的，但这只是动画的基础，希望它能满足您的要求。

谢谢，但这会加载一个不同的CSS文件，并且不会从下面向上滑动。您可以将w3 animate top更改为w3 animate bottom，W3CSS代码的完整列表在这里：再次感谢您，但正如我所说，我不想在Bootstrap4之上添加另一个框架。

<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<button type="submit" class="btn btn-block btn-default footer__btn" data-toggle="modal" data-target="#myModal2"> Open Modal</button>
<div class="modal fade" id="myModal2" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
  <div class="modal-dialog" role="document">
    <div class="modal-content w3-animate-bottom">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title" id="myModalLabel"> ABOUT </h4>
      </div>
      <div class="modal-body">
        CONTEÚDO
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>

      </div>
    </div>
  </div>
</div>

.modal.fade .modal-dialog {
    -webkit-transform: translate(0,100%);
    -ms-transform: translate(0,100%);
    -o-transform: translate(0,100%);
    transform: translate(0,100%);
}

.animate-bottom {
  position: relative;
  animation: animatebottom 0.4s;
}

@keyframes animatebottom {
  from {
    bottom: -300px;
    opacity: 0;
  }

  to {
    bottom: 0;
    opacity: 1;
  }
}

<button type="submit" class="btn btn-block btn-default footer__btn" data-toggle="modal" data-target="#myModal2"> Open Modal</button>
<div class="modal fade animate" id="myModal2" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
  <div class="modal-dialog" role="document">
    <div class="modal-content animate-bottom"> <!-- Here you have the juicy hahah -->
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title" id="myModalLabel"> ABOUT </h4>
      </div>
      <div class="modal-body">
        CONTEÚDO
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>

      </div>
    </div>
  </div>
</div>