Bootstrap 4 collapsing two navbars into one toggle

2020-01-29 17:17发布

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问题:

I've been trying to apply this Bootstrap 4.0 - Two NavBars that collapse into one toggle answer to my issue but am not resolving it after some effort.

I'm trying to have the content of both navbars collapse into one toggle button.

The two issues are once collapsed to sm my toggle button doesn't display its content (from either target), and that at sm width my lower navbar does not maintain it's height. My code:

    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm"
            crossorigin="anonymous">
    
    <title>Hello, world!</title>
    </head>
    
    <body>
        <nav class="navbar navbar-expand-sm navbar-dark bg-dark sticky-top">
            <button class="navbar-toggler" data-toggle="collapse" data-target="#collapse_target1, #collapse_target2">
                <span class="navbar-toggler-icon"></span>
            </button>
            <div class="collapse navbar-collapse" id="collapse_target1">
                <ul class="navbar-nav mx-auto">
                    <li class="nav-item">
                        <a class="nav-link" href="#">Link 1</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Link 2</a>
                    </li>
                    <a class="navbar-brand">
                        <img src="https://image.freepik.com/free-vector/businessman-shouting-through-megaphone_23-2147511376.jpg" style="height: 2em">
                        <span>Home</span>
                    </a>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Link 3</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Link 4</a>
                    </li>
                </ul>
            </div>
        </nav>
        <nav class="navbar navbar-expand-sm navbar-light bg-light">
            <div class="collapse navbar-collapse" id="collapse_target2">
                <ul class="navbar-nav mx-auto">
                    <li class="nav-item">
                        <a class="nav-link" href="#">Link 5</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Link 6</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Link 7</a>
                    </li>
                </ul>
            </div>
        </nav>
        <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>
    </body>

回答1:

Use a single class to data-target the Navbars, instead of different id's. For example, give both the navbar-collapse elements the navbars class, and then the target is data-target=".navbars".

Demo: https://www.codeply.com/go/PvHpcBNuAp

Also, I'm not sure why you're using sticky-top on the 1st navbar. You should remove that otherwise the 2nd navbar will slide under the first on mobile when scrolling. If you want both navbars fixed at the top, see this answer.

   <nav class="navbar navbar-expand-sm navbar-dark bg-dark">
        <button class="navbar-toggler" data-toggle="collapse" data-target=".navbars">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse navbars" id="collapse_target1">
            <ul class="navbar-nav mx-auto">
                <li class="nav-item">
                    <a class="nav-link" href="#">Link 1</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Link 2</a>
                </li>
                <a class="navbar-brand">
                    <img src="https://image.freepik.com/free-vector/businessman-shouting-through-megaphone_23-2147511376.jpg" style="height: 2em">
                    <span>Home</span>
                </a>
                <li class="nav-item">
                    <a class="nav-link" href="#">Link 3</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Link 4</a>
                </li>
            </ul>
        </div>
    </nav>
    <nav class="navbar navbar-expand-sm navbar-light bg-light">
        <div class="collapse navbar-collapse navbars" id="collapse_target2">
            <ul class="navbar-nav mx-auto">
                <li class="nav-item">
                    <a class="nav-link" href="#">Link 5</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Link 6</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Link 7</a>
                </li>
            </ul>
        </div>
    </nav>

Also see: Bootstrap 4 navbar with 2 rows



回答2:

To control more than one navbar with one toggler use a class instead of an id for the data-target attribute. In the example below I used the class navbar1and2.

To maintain the height of the second navbar the same as in the uncollapsed state you can add style="min-height: 56px" to that navbar.

Click "run code snippet" below and expand to full page for testing:

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

<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>

<nav class="navbar navbar-expand-sm navbar-dark bg-dark">
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target=".navbar1and2" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse navbar1and2" id="navbarSupportedContent">
        <ul class="navbar-nav mx-auto">
            <li class="nav-item">
                <a class="nav-link" href="#">Link 1</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link 2</a>
            </li>
            <a class="navbar-brand">
                <img src="https://image.freepik.com/free-vector/businessman-shouting-through-megaphone_23-2147511376.jpg" style="height: 2em">
                <span>Home</span>
            </a>
            <li class="nav-item">
                <a class="nav-link" href="#">Link 3</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link 4</a>
            </li>
        </ul>
    </div>
</nav>

<nav class="navbar navbar-expand-sm navbar-light bg-light" style="min-height: 56px">

    <div class="collapse navbar-collapse navbar1and2" id="navbarSupportedContent2">
        <ul class="navbar-nav mx-auto">
            <li class="nav-item">
                <a class="nav-link" href="#">Link 5</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link 6</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link 7</a>
            </li>
        </ul>
    </div>
</nav>



标签： html twitter-bootstrap bootstrap-4
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