侧边栏折叠后强制内容适合全宽 Bootstrap答案

【问题标题】：Force content to fit full width after sidebar collapsed Bootstrap侧边栏折叠后强制内容适合全宽 Bootstrap
【发布时间】：2018-02-12 01:04:16
【问题描述】：

我在我的页面中使用了这个 updated Bootstrap sidebar collapse，但是这里的侧边栏和内容对于两个 div 的宽度都是固定的，主要内容在折叠后不会占满宽度。

HTML：

<div class="col-md-3 col-xs-1 p-l-0 p-r-0 collapse in" id="sidebar">...</div>

<main class="col-md-9 col-xs-11 p-l-2 p-t-2">...</main>

但我想要的是侧边栏折叠后，主要内容应该是全宽。

我检查了this 和堆栈溢出的其他一些问题，但没有找到我想要的

【问题讨论】：

当侧边栏折叠在那里时，主要内容确实会全宽。此外，您没有使用 Bootstrap 4 代码。
Bootstrap 3 和 Bootstrap 4 完全不兼容。所以，你必须决定（在你的标签中）这是关于哪个版本。
我没有在这里使用 bootstrap 4，但我正在尝试在我的页面中迁移到 bootstrap 4
啊哈。我懂了。但这在您的问题中应该非常清楚。
只是参考这个更新的例子codeply.com/go/7ihZ0Mffyj

标签： twitter-bootstrap-3 bootstrap-4

【解决方案1】：

以下是需要做的：

首先我用col 替换了过时的col-xs。然后我用col替换了剩余的col-md-9 col-11。完毕！

它起作用的原因是侧边栏的第一列已经定义。 col 然后只是填写所有可用的剩余空间。

这是工作代码：

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">

<style>
    #sidebar .list-group-item {
        border-radius: 0;
        background-color: #333;
        color: #ccc;
        border-left: 0;
        border-right: 0;
        border-color: #2c2c2c;
        white-space: nowrap;
    }

    /* highlight active menu */
    #sidebar .list-group-item:not(.collapsed) {
        background-color: #222;
    }

    /* closed state */
    #sidebar .list-group .list-group-item[aria-expanded="false"]::after {
        content: " \f0d7";
        font-family: FontAwesome;
        display: inline;
        text-align: right;
        padding-left: 5px;
    }

    /* open state */
    #sidebar .list-group .list-group-item[aria-expanded="true"] {
        background-color: #222;
    }
    #sidebar .list-group .list-group-item[aria-expanded="true"]::after {
        content: " \f0da";
        font-family: FontAwesome;
        display: inline;
        text-align: right;
        padding-left: 5px;
    }

    /* level 1*/
    #sidebar .list-group .collapse .list-group-item  {
        padding-left: 20px;
    }

    /* level 2*/
    #sidebar .list-group .collapse > .collapse .list-group-item {
        padding-left: 30px;
    }

    /* level 3*/
    #sidebar .list-group .collapse > .collapse > .collapse .list-group-item {
        padding-left: 40px;
    }

    @media (max-width:48em) {
        /* overlay sub levels on small screens */
        #sidebar .list-group .collapse.in, #sidebar .list-group .collapsing {
            position: absolute;
            z-index: 1;
            width: 190px;
        }
        #sidebar .list-group > .list-group-item {
            text-align: center;
            padding: .75rem .5rem;
        }
        /* hide caret icons of top level when collapsed */
        #sidebar .list-group > .list-group-item[aria-expanded="true"]::after,
        #sidebar .list-group > .list-group-item[aria-expanded="false"]::after {
            display:none;
        }
    }

    /* change transition animation to width when entire sidebar is toggled */
    #sidebar.collapse {
        -webkit-transition-timing-function: ease;
        -o-transition-timing-function: ease;
        transition-timing-function: ease;
        -webkit-transition-duration: .2s;
        -o-transition-duration: .2s;
        transition-duration: .2s;
    }

    #sidebar.collapsing {
        opacity: 0.8;
        width: 0;
        -webkit-transition-timing-function: ease-in;
        -o-transition-timing-function: ease-in;
        transition-timing-function: ease-in;
        -webkit-transition-property: width;
        -o-transition-property: width;
        transition-property: width;

    }

    main{
        background-color:green;   
    }
</style>

<div class="container-fluid">
    <div class="row">
        <div class="col-md-3 col-1 pl-0 pr-0 collapse in" id="sidebar">
            <div class="list-group panel">
                <a href="#menu1" class="list-group-item collapsed" data-toggle="collapse" data-parent="#sidebar" aria-expanded="false"><i class="fa fa-dashboard"></i> <span class="hidden-sm-down">Item 1</span> </a>
                <div class="collapse" id="menu1">
                    <a href="#menu1sub1" class="list-group-item" data-toggle="collapse" aria-expanded="false">Subitem 1 </a>
                    <div class="collapse" id="menu1sub1">
                        <a href="#" class="list-group-item" data-parent="#menu1sub1">Subitem 1 a</a>
                        <a href="#" class="list-group-item" data-parent="#menu1sub1">Subitem 2 b</a>
                        <a href="#menu1sub1sub1" class="list-group-item" data-toggle="collapse" aria-expanded="false">Subitem 3 c </a>
                        <div class="collapse" id="menu1sub1sub1">
                            <a href="#" class="list-group-item" data-parent="#menu1sub1sub1">Subitem 3 c.1</a>
                            <a href="#" class="list-group-item" data-parent="#menu1sub1sub1">Subitem 3 c.2</a>
                        </div>
                        <a href="#" class="list-group-item" data-parent="#menu1sub1">Subitem 4 d</a>
                        <a href="#menu1sub1sub2" class="list-group-item" data-toggle="collapse"  aria-expanded="false">Subitem 5 e </a>
                        <div class="collapse" id="menu1sub1sub2">
                            <a href="#" class="list-group-item" data-parent="#menu1sub1sub2">Subitem 5 e.1</a>
                            <a href="#" class="list-group-item" data-parent="#menu1sub1sub2">Subitem 5 e.2</a>
                        </div>
                    </div>
                    <a href="#" class="list-group-item" data-parent="#menu1">Subitem 2</a>
                    <a href="#" class="list-group-item" data-parent="#menu1">Subitem 3</a>
                </div>
                <a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-film"></i> <span class="hidden-sm-down">Item 2</span></a>
                <a href="#menu3" class="list-group-item collapsed" data-toggle="collapse" data-parent="#sidebar" aria-expanded="false"><i class="fa fa-book"></i> <span class="hidden-sm-down">Item 3 </span></a>
                <div class="collapse" id="menu3">
                    <a href="#" class="list-group-item" data-parent="#menu3">3.1</a>
                    <a href="#menu3sub2" class="list-group-item" data-toggle="collapse" aria-expanded="false">3.2 </a>
                    <div class="collapse" id="menu3sub2">
                        <a href="#" class="list-group-item" data-parent="#menu3sub2">3.2 a</a>
                        <a href="#" class="list-group-item" data-parent="#menu3sub2">3.2 b</a>
                        <a href="#" class="list-group-item" data-parent="#menu3sub2">3.2 c</a>
                    </div>
                    <a href="#" class="list-group-item" data-parent="#menu3">3.3</a>
                </div>
                <a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-heart"></i> <span class="hidden-sm-down">Item 4</span></a>
                <a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-list"></i> <span class="hidden-sm-down">Item 5</span></a>
                <a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-clock-o"></i> <span class="hidden-sm-down">Link</span></a>
                <a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-th"></i> <span class="hidden-sm-down">Link</span></a>
                <a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-gear"></i> <span class="hidden-sm-down">Link</span></a>
                <a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-calendar"></i> <span class="hidden-sm-down">Link</span></a>
                <a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-envelope"></i> <span class="hidden-sm-down">Link</span></a>
                <a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-bar-chart-o"></i> <span class="hidden-sm-down">Link</span></a>
                <a href="#" class="list-group-item collapsed" data-parent="#sidebar"><i class="fa fa-star"></i> <span class="hidden-sm-down">Link</span></a>
            </div>
        </div>
        <main class="col pl-2 pt-2">
            <a href="#sidebar" data-toggle="collapse"><i class="fa fa-navicon fa-lg"></i></a>
            <hr>
            <div class="page-header">
                <h1>Bootstrap 4 Sidebar Menu</h1>
            </div>
            <p class="lead">A responsive, multi-level vertical accordion.</p>
        </main>
    </div>
</div>

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

【讨论】：

糟糕，忘记用有效的 Bootstrap 4 代码替换填充。现在检查我更新的代码 sn-p。（p-l 和 p-r 和 p-t 类的所有实例必须分别替换为 pl、pr 和 pt。
实际上，pt-2 在这种特殊情况下不会做任何事情。因此，如果您想在顶部添加一点填充，那么您需要将 pt-2 类添加到行中，而不是将其添加到列中。（pt-2 表示“顶部填充 2 个单位”）