如何使用 Bootstrap 5 将按钮附加到画布外抽屉？

Question

我正在使用 Bootstrap 5 画布外功能。我正在尝试将一个按钮连接到画布外滑出抽屉的侧面。因此，当抽屉不在画布上时，按钮是可见的。单击按钮时，抽屉会滑出，但按钮不会将抽屉内容覆盖在按钮上，而是就像连接到滑出抽屉一样并随之移动。像这样：

我不确定这是否可能。如果是这样，我将如何去做这件事？

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">

<div class="offcanvas offcanvas-start" id="demo">
  <div class="offcanvas-header">
    <h1 class="offcanvas-title">Heading</h1>
    <button type="button" class="btn-close" data-bs-dismiss="offcanvas"></button>
  </div>
  <div class="offcanvas-body">
    <p>Some text lorem ipsum.</p>
  </div>
</div>

<div class="container-fluid mt-3">
  <button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#demo">
        Open
    </button>
</div>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>

Answer 1

You could apply sideward translation with transition to match that of the sidebar when the panel is open. I'm using a div around the button because the button has transitions on it already, and I'm raising its stacking order to be above the sidebar mask.

.offcanvas-btn-box {
  transition: transform .3s ease-in-out; /* same as what's on the panel */
}

.offcanvas.show + div .offcanvas-btn-box {
  transform: translateX(400px);
  position: relative;
  z-index: 1100;
}


/* optional junk to toggle the button text */
.offcanvas-btn-box .btn span:last-child,
.offcanvas.show + div .offcanvas-btn-box .btn span:first-child {
  display: none;
}

.offcanvas.show + div .offcanvas-btn-box .btn span:last-child {
  display: inline;
}

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">

<div class="offcanvas offcanvas-start" id="demo">
  <div class="offcanvas-header">
    <h1 class="offcanvas-title">Heading</h1>
    <button type="button" class="btn-close" data-bs-dismiss="offcanvas"></button>
  </div>
  <div class="offcanvas-body">
    <p>Some text lorem ipsum.</p>
  </div>
</div>

<div class="container-fluid mt-3">
  <div class="offcanvas-btn-box">
    <button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#demo">
        <span>Open</span><span>Close</span>
    </button>
  </div>
</div>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>

Alternatively, put the button inside the panel and position it absolutely. This has the benefit of not cluttering your main page layout.

.offcanvas-btn {
  left: 420px;
  visibility: visible;
}

/* optional junk to toggle the button text */
.offcanvas-btn span:last-child,
.offcanvas.show .offcanvas-btn span:first-child {
  display: none;
}

.offcanvas.show .offcanvas-btn span:last-child {
  display: inline;
}

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">

<div class="offcanvas offcanvas-start" id="demo">
  <button class="btn btn-primary offcanvas-btn position-absolute mt-2" type="button" data-bs-toggle="offcanvas" data-bs-target="#demo">
        <span>Open</span><span>Close</span>
    </button>

  <div class="offcanvas-header">
    <h1 class="offcanvas-title">Heading</h1>
    <button type="button" class="btn-close" data-bs-dismiss="offcanvas"></button>
  </div>
  <div class="offcanvas-body">
    <p>Some text lorem ipsum.</p>
  </div>
</div>

<div class="container-fluid mt-4 pt-4">
  Some page content.
</div>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>