Tips for setting a Bootstrap 3 dropdown menu to automatically open when located within a collapsed navbar

Is there a way to have my dropdown menu automatically open when the collapsed navbar is opened? Take a look at this example I created in a fiddle to see what I'm working with so far.

Right now, when you click on the navbar in its collapsed state, two links and a dropdown menu are shown. You need to click again to actually open the dropdown menu.

My goal is to have the dropdown menu open by default and hide the a.dropdown-toggle element when the collapsed navbar is expanded. Here's a visual of how I want it to look:

  • Link
  • Link
  • Dropdown
  • Action
  • Another action
  • Something else here
  • Separated link
  • One more separated link

Initially, I tried using display: none on a.dropdown-toggle, but that ended up hiding the entire dropdown menu. If anyone has suggestions, please let me know. I'm open to solutions involving jQuery or CSS.

Here's the code snippet for reference:

<nav class="navbar navbar-default" role="navigation">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Brand</a>
    </div>

    <!-- Collect the nav links, forms, and other content for toggling -->
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Link</a></li>
        <li><a href="#">Link</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
          <ul class="dropdown-menu" role="menu">
            <li><a href="#">Action</a></li>
            <li><a href="#">Another action</a></li>
            <li><a href="#">Something else here</a></li>
            <li class="divider"></li>
            <li><a href="#">Separated link</a></li>
            <li class="divider"></li>
            <li><a href="#">One more separated link</a></li>
          </ul>
        </li>
      </ul>
    </div><!-- /.navbar-collapse -->
  </div><!-- /.container-fluid -->
</nav>

Answer №1

To enhance the mobile viewing experience, you can incorporate CSS styles that are responsive. Simply add the following code snippet to your CSS file:

@media only screen and (max-width:480px){
    .dropdown-menu{
        display: block;
        position: static;
        background-color:transparent;
        border:0 none;
        box-shadow:none;
        margin-top:0;
        position:static;
        width:100%;
    }
    .navbar-nav .dropdown-menu > li > a, 
    .navbar-nav .dropdown-menu .dropdown-header {
        padding:5px 15px 5px 25px;
    }
    .navbar-nav .dropdown-menu > li > a{
        line-height:20px;
    }
    .navbar-default .navbar-nav .dropdown-menu > li > a{    
        color:#777;
    }
}

For a complete view of how it works, refer to this link: Demo jsfiddle

I hope this information is useful for you.

Answer №2

Based on the Bootstrap v3 documentation, utilizing Javascript to listen for collapse events is possible:

$(function () {
  $('#bs-example-navbar-collapse-1').on('shown.bs.collapse', function(e) {
    $('#my_dropdown').dropdown('toggle', 'open').hide();
    console.log('shown:', e);
  });
});

It seems that forcing the "toggle" button to hide may not produce the desired outcome as the submenu remains indented. Instead of trying to manipulate Bootstrap extensively, consider implementing two menus with different structures for various screen sizes and display the appropriate one using media queries.

Fiddle: http://jsfiddle.net/scardine/tw82o88y/

Answer №3

To enhance your code, consider incorporating a JavaScript function:

<script>
$(document).ready(function(){
$(".dropdown").hover(            
function() {
$('.dropdown-menu', this).stop( true, true ).slideDown("fast");
$(this).toggleClass('open');        
},
function() {
$('.dropdown-menu', this).stop( true, true ).slideUp("fast");
$(this).toggleClass('open');       
}
);
});
</script>

For a practical example and demonstration, visit dtc-eng

Answer №4

To fix the issue, simply delete data-toggle="dropdown"

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