overflow:scroll div 内含 position:absolute 元素

overflow:scroll div with position:absolute element inside

我在overflow:scroll容器里面有一个table,里面有一些按钮table,当有人点击它们的时候,他们会显示一个contextual/tooltip(位置:绝对图层)文本。

当我向右滚动并单击按钮时,它会向右移动而忽略滚动:

使容器相对位置解决了位置问题,但它出现在容器内没有显示菜单:

我需要帮助才能实现以下所需行为:

这是片段:

.container{
  width:200px;
  height:100px;
  overflow:scroll;
  position:relative; /* removing this solves the problem, but .contextual moves to the original position */
}
.board{
  width:400px;
}
.contextual{
  display:none;
  position:absolute;
  width:100px;
  height:100px;
  margin: 20px;
  z-index: 2;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class=container>
    <table class=board>
      <tr><td colspan=2>This board size (200) is bigger than its container size (100).</td></tr>
      <tr>
        <td>this is a button with a contextual element</td>
        <td>
          <input type=button value="click me" onclick="$('.contextual').show();" />
          <div class=contextual>This is a contextual help text.</div>
        </td>
      </tr>
    </table>
</div>

您可以使用 overflow: auto。这将仅在必要时显示滚动条。此外,您可以从 .contextual.

中删除 z-index: 2

将上下文 div 放在溢出 div 之外,并根据鼠标位置进行定位。

showContext = function() {
    var e = window.event;

    var posX = e.clientX;
    var posY = e.clientY;
    var context = document.getElementById("contextual")
    context.style.top = posY + "px";
    context.style.left = posX + "px";
    context.style.display = "block";
}
.container{
  width:200px;
  height:100px;
  overflow:scroll;
  position:relative; /* removing this solves the problem, but .contextual moves to the original position */
  z-index:1;
}
.board{
  width:400px;
}
#contextual{
  display:none;
  position:absolute;
  width:100px;
  height:100px;
  background-color:grey;
  z-index: 2;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container">
    <table class="board">
      <tr><td colspan=2>This board size (200) is bigger than its container size (100).</td></tr>
      <tr>
        <td>this is a button with a contextual element</td>
        <td>
          <input type="button" value="click me" onclick="javascript:showContext();" />
          
        </td>
      </tr>
    </table>
</div>
<div id="contextual">This is a contextual help text.</div>

对于遇到此问题的人,但设置为鼠标位置无济于事

如果你和我有同样的问题,父容器设置为 overflow: scroll 并且尽管 position: absolute 父容器的子元素被切断 - 请执行以下操作

用例,构建下拉菜单

  • 将元素设置为 position: fixed
  • 获取父元素的视口位置
  • 将位置 topleftbottomright 值设置为视口值

您可以使用与@jfeferman

中的代码片段相同的代码