responsive mega menu with multiple levels in Bootstrap 3

I specialize in creating mega menu navigation using Bootstrap 3.

HTML: 

<div class="container">
    <nav class="navbar navbar-default">
        <div class="navbar-header">
            <button class="navbar-toggle" type="button" data-toggle="collapse" data-target=".js-navbar-collapse">   <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="#">MegaMenu</a>

        </div>
        <div class="collapse navbar-collapse js-navbar-collapse">
            <ul class="nav navbar-nav">
                <li class="dropdown mega-dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Collection <span class="glyphicon glyphicon-chevron-down pull-right"></span></a>

                    <ul class="dropdown-menu mega-dropdown-menu row">
                        <!-- Dropdown Content Here -->
                        
                    </ul>
                </li>
            </ul>
                            <ul class="nav navbar-nav">
                <li class="dropdown mega-dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Collection 2<span class="glyphicon glyphicon-chevron-down pull-right"></span></a>

                    <ul class="dropdown-menu mega-dropdown-menu row">
                        <!-- Dropdown Content Here -->
                        
                    </ul>
                </li>
            </ul>
        </div>
        <!-- /.nav-collapse -->
    </nav>
</div>

CSS:

body {
    font-family:'Open Sans', 'sans-serif';
    background:#f0f0f0;
}
.navbar-nav>li>.dropdown-menu {
    margin-top:20px;
    border-top-left-radius:4px;
    border-top-right-radius:4px;
}
.navbar-default .navbar-nav>li>a {
    width:200px;
    font-weight:bold;
}
.mega-dropdown {
    position: static !important;
    width:100%;
}
.mega-dropdown-menu {
    padding: 20px 0px;
    width: 100%;
    box-shadow: none;
    -webkit-box-shadow: none;
}
.mega-dropdown-menu:before {
    content:"";
    border-bottom: 15px solid #fff;
    border-right: 17px solid transparent;
    border-left: 17px solid transparent;
    position: absolute;
    top: -15px;
    left: 285px;
    z-index: 10;
}
.mega-dropdown-menu:after {
    content:"";
    border-bottom: 17px solid #ccc;
    border-right: 19px solid transparent;

Now, I have two <ul> for the navigation menus. In both, I see a submenu. This means that if I click on Collection or Collection 2, I see a submenu. However, there seems to be an issue with the second submenu placement beneath Collection 2.

How can this issue be fixed?

Problem Description: When clicking on Collection and Collection 2, one submenu appears below Collection only instead of both.

Note: The position of the arrow needs to be adjusted. For both dropdowns, the upward arrows are indicating the same position. These positions need to be changed as follows:

  1. First Dropdown: https://i.sstatic.net/xlWPN.png
  2. Second Dropdown: https://i.sstatic.net/RrP9D.png

JSFIDDLE DEMO

htmltwitter-bootstrapcssmegamenu

Answer №1

The issue arises due to the positioning of the CSS triangle in relation to the overall navbar. Since this element's position remains constant, the triangle fails to reposition itself accordingly.

An effective solution is to nest the triangle within the currently selected item. To achieve this, simply remove:

.mega-dropdown-menu:before {
    content:"";
    border-bottom: 15px solid #fff;
    border-right: 17px solid transparent;
    border-left: 17px solid transparent;
    position: relative;
    top: -15px;
    left: 150px;
    z-index: 10;
}
.mega-dropdown-menu:after {
    content:"";
    border-bottom: 17px solid #ccc;
    border-right: 19px solid transparent;
    border-left: 19px solid transparent;
    position: absolute;
    top: -17px;
    left: 283px;
    z-index: 8;
}

and replace it with:

.open .dropdown-toggle:after {
    border-bottom: 15px solid #fff;
    border-left: 17px solid transparent;
    border-right: 17px solid transparent;
    content: "";
    left: 163px;
    position: absolute;
    bottom: -21px;
    z-index: 1500;
}
.open .dropdown-toggle span:after {
    border-bottom: 17px solid #ccc;
    border-left: 19px solid transparent;
    border-right: 19px solid transparent;
    content: "";
    left: -10px;
    position: absolute;
    bottom: -41px;
    z-index: 8;
}

This will attach the triangle to the text and down arrows, adjusting its position relative to these elements.

See a demonstration on Fiddle - http://jsfiddle.net/7eHFd/4/

Update: If the triangle remains static when resizing, wrap the above code with a media query like so:

@media (min-width: 768px) {
}

View an updated version on Fiddle - http://jsfiddle.net/7eHFd/5/

Answer №2

Solution: JS Fiddle Solution Link

Insights:

According to this resource, it is not possible to manipulate the CSS of pseudo elements. The styling and content generated by :after or :before are not part of the Document Object Model (DOM) and hence cannot be targeted or modified.

In addition, the solution provided is ideal for:

  1. Creating a responsive design
  2. Centering the menu arrow within the menu item

Challenges Encountered:

Pseudo Class CSS:

.mega-dropdown-menu:before {
    content:"";
    border-bottom: 15px solid #fff;
    border-right: 17px solid transparent;
    border-left: 17px solid transparent;
    position: absolute;
    top: -15px;
    left: 285px;
    z-index: 10;
}
.mega-dropdown-menu:after {
    content:"";
    border-bottom: 17px solid #ccc;
    border-right: 19px solid transparent;
    border-left: 19px solid transparent;
    position: absolute;
    top: -17px;
    left: 283px;
    z-index: 8;
}

To address this issue, the `.mega-dropdown-menu' class needs to have its pseudo border styling reset.

Solution: JS Fiddle Solution Link

Therefore, a new element must be introduced with the following styling attributes:

CSS Revisions:

.show{
    display: block;
}
.arrow1, .arrow2 {
    position: absolute;
    z-index: 99999;
    display: none;
}
.open .arrow1, .open .arrow2 {
    display: block;
}
.arrow1 span:after, .arrow2 span:after {
    content:"";
    border-bottom: 15px solid #fff;
    border-right: 17px solid transparent;
    border-left: 17px solid transparent;
    position: absolute;
    top: 6px;
    left: 2px;
}
.arrow1 span:before, .arrow2 span:before {
    content:"";
    border-bottom: 17px solid #ccc;
    border-right: 19px solid transparent;
    border-left: 19px solid transparent;
    position: absolute;
    top: 4px;
}
.mega-dropdown-menu:after, .mega-dropdown-menu:before{border: none;}

JavaScript Modifications:

$(".nav > li.mega-dropdown").eq( 0 ).append("<p class='arrow1 arrOw'><span></span></p>");
$(".nav > li.mega-dropdown").eq( 1 ).append("<p class='arrow2 arrOw'><span></span></p>");

$(".nav > li.mega-dropdown").eq( 0 ).click(function () {
    //x = $(".mega-dropdown.open").position();
    x = $(this).position();
    aa = x.left+75;
    $(this).find(".arrow1").css("left", aa);
});
$(".nav > li.mega-dropdown").eq( 1 ).click(function () {
    //x = $(".mega-dropdown.open").position();
    x = $(this).position();
    aa = x.left + 75;
    $(this).find(".arrow2").css("left", aa);
});

If there are any further issues, please leave a comment below.

Best Regards, D.

Answer №3

Resolved an Issue here >> Mega drop down triangle

View in Full Screen

Confirmed to be working on 1920 X 1080 Resolution!

Currently tackling the second issue.

CSS code snippet:

  body {
    font-family:'Open Sans', 'sans-serif';
    background:#f0f0f0;
}
.navbar-nav>li>.dropdown-menu {
    margin-top:20px;
    border-top-left-radius:4px;
    border-top-right-radius:4px;
}
.navbar-default .navbar-nav>li>a {
    width:200px;
    font-weight:bold;
}
.mega-dropdown {
    position: static !important;
    width:100%;
}
.mega-dropdown-menu {
    padding: 20px 0px;
    width: 100%;
    box-shadow: none;
    -webkit-box-shadow: none;
}
.mega-dropdown-menu-1:before {
    content:"";
    border-bottom: 15px solid #fff;
    border-right: 17px solid transparent;
    border-left: 17px solid transparent;
    position: absolute;
    top: -15px;
    left: 30%;
    z-index: 10;
}
.mega-dropdown-menu-1:after {
    content:"";
    border-bottom: 17px solid #ccc;
    border-right: 19px solid transparent;
    border-left: 19px solid transparent;
    position: absolute;
    top: -17px;
    left: 30%;
    z-index: 8;
}
.mega-dropdown-menu-2:before {
    content:"";
    border-bottom: 15px solid #fff;
    border-right: 17px solid transparent;
    border-left: 17px solid transparent;
    position: absolute;
    top: -15px;
    left: 50%;
    z-index: 10;
}
.mega-dropdown-menu-2:after {
    content:"";
    border-bottom: 17px solid #ccc;
    border-right: 19px solid transparent;
    border-left: 19px solid transparent;
    position: absolute;
    top: -17px;
    left: 50%;
    z-index: 8;
}
.mega-dropdown-menu > li > ul {
    padding: 0;
    margin: 0;
}
.mega-dropdown-menu > li > ul > li {
    list-style: none;
}
.mega-dropdown-menu > li > ul > li > a {
    display: block;
    padding: 3px 20px;
    clear: both;
    font-weight: normal;
    line-height: 1.428571429;
    color: #999;
    white-space: normal;
}
.mega-dropdown-menu > li ul > li > a:hover, .mega-dropdown-menu > li ul > li > a:focus {
    text-decoration: none;
    color: #444;
    background-color: #f5f5f5;
}
.mega-dropdown-menu .dropdown-header {
    color: #428bca;
    font-size: 18px;
    font-weight:bold;
}
.mega-dropdown-menu form {
    margin:3px 20px;
}
.mega-dropdown-menu .form-group {
    margin-bottom: 3px;
}

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