在可滚动模式中具有固定位置的 Div

Question

我在带有滚动条的模式中有一个 div，它应该相对于浏览器窗口具有固定的位置，并且不应该随着模式滚动。

我试过position:fixed，但它不起作用。在这里你可以看到它的上下文中的问题：

$('.launchConfirm').on('click', function (e) {
    $('#confirm').modal({
        show: true
    });
});

@import url( 'https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css' );

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
<div class="page-container">
    <div class="container">
        <br />
        <button type="button" class="btn launchConfirm">Open modal</button>
    </div>
</div>
<div class="modal fade" id="confirm">
    <div class="modal-dialog">
        <div class="modal-content">
            <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">Modal title</h4>

            </div>
            <div class="modal-body">
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <div style="position:fixed;top:40px;left:10px;background-color:red">This div should be fixed<br>and should not scroll away.</div>
            </div>
            <div class="modal-footer">
                some random buttons
            </div>
        </div>
        <!-- /.modal-content -->
    </div>
    <!-- /.modal-dialog -->
</div>
<!-- /.modal -->

我怎样才能修复那个 div？

Answer 1

您需要将 DIV 移出模态框。

当祖先元素应用了transform 时，固定定位与viewport except 相关。 .modal-dialog 应用了transform，这会创建一个新的上下文来放置 DIV（这就是为什么你的 DIV 会留在模态框内）。

CSS Positioning - MDN

Answer 2

你可以这样使用。

$('.launchConfirm').on('click', function (e) {
    $('#confirm').modal({
        show: true
    });
});

@import url( 'https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css' );
.modal-open .modal {
   overflow: hidden;
 }
 .modal-body {
   height: calc(100vh - 126px);
   overflow-y:scroll;
 }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
<div class="page-container">
    <div class="container">
        <br />
        <button type="button" class="btn launchConfirm">Open modal</button>
    </div>
</div>
<div class="modal fade" id="confirm">
    <div class="modal-dialog">
        <div class="modal-content">
            <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">Modal title</h4>

            </div>
            <div class="modal-body">
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <div style="position:fixed;top:40px;left:10px;background-color:red">This div should be fixed<br>and should not scroll away.</div>
            </div>
            <div class="modal-footer">
                some random buttons
            </div>
        </div>
        <!-- /.modal-content -->
    </div>
    <!-- /.modal-dialog -->
</div>
<!-- /.modal -->

Answer 3

我设法根据@Shiplo Rahman 和@Dejan.S 的回答解决了这个问题

删除了 modal-header，将所有内容放入 modal-body 并执行此处描述的 jquery 解决方法：jQuery: Fix div when browser scrolls to it

$('.launchConfirm').on('click', function (e) {
    $('#confirm').modal({
        show: true
    });
});

jQuery(function($) {
  function fixDiv() {
    var $cache = $('#getFixed');
    if ($('.modal-body').scrollTop() > 50)
    {
    $cache.css({
        'position': 'fixed',
        'top': '0px',
        'left': '25px',
        'width': '600px'
      });
    }
    else
      $cache.css({
        'position': 'relative',
        'top': 'auto',
        'left': '10px'
      });
  }
  $('.modal-body').scroll(fixDiv);
  fixDiv();
});

    @import url( 'https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css' );
.modal-open .modal {
   //overflow: hidden;
 }
 .modal-body {
   height: calc(100vh - 126px);
   overflow-y: scroll;
 }
 
 #getFixed {
   position: relative;
   left: 10px;
   width: 600px;
 }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>


<div class="page-container">
    <div class="container">
        <br />
        <button type="button" class="btn launchConfirm">Open modal</button>
    </div>
</div>
<div class="modal fade" id="confirm">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-body" id="confirm2">
            <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span>
                </button>
                 <h4 class="modal-title">Modal title</h4>
                 <div id="getFixed" style="background-color:red">This div should be fixed<br>and should not scroll away.</div>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
                <p>One fine body&hellip;</p>
            </div>
            <div class="modal-footer">
                some random buttons
            </div>
        </div>
        <!-- /.modal-content -->
    </div>
    <!-- /.modal-dialog -->
</div>
<!-- /.modal -->

以下是来源： http://jsfiddle.net/roahda03/21/

Answer 4

要在模态中使用固定的 div，请执行以下操作：

<div class="modal fade" role="dialog">

    <div class="fixed-div">
        *your fixed div here...
        it can even be your .modal-header div*
    </div>

    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-body">

CSS：

.fixed-div {
    width: 100%;
    position: fixed;
    z-index: 1051; /* anything above 1050*/
    background: #fff;
    box-shadow: 0 5px 20px 4px rgba(0,0,0,.1);
}

.fixed-div 也可以是您的.modal-header； 但.modal-header 必须在.modal 之后而不是.modal-content 之后

Answer 5

在模态体中你应该设置一个最大高度，然后告诉溢出：

.modal-body{
    overflow: auto;
    max-height: 200px;
}