Bootstrap 4 - Nav - Hiding extra menu items

Here is another option for Bootstrap 4 that will collapse the extra Navbar items into a dropdown menu on the right side. Use some logic (this is using jQuery) to control the placement of items in the menu...

function (menu,maxHeight) {

    var nav = $(menu);

    // check height of menu
    var navHeight = nav.innerHeight();

    // when the height is taller the navbar has wrapped onto 2 lines
    if (navHeight >= maxHeight) {
        $(menu + ' .dropdown').removeClass('d-none');
        $(".navbar-nav").removeClass('w-auto').addClass("w-100");
        while (navHeight > maxHeight) {
            //  add child to dropdown
            var children = nav.children(menu + ' li:not(:last-child)');
            var count = children.length;
            $(children[count - 1]).prependTo(menu + ' .dropdown-menu');
            navHeight = nav.innerHeight();
        }
        $(".navbar-nav").addClass("w-auto").removeClass('w-100');
    }
    else {
        var collapsed = $(menu + ' .dropdown-menu').children(menu + ' li');

        if (collapsed.length===0) {
          $(menu + ' .dropdown').addClass('d-none');
        }

        while (navHeight < maxHeight && (nav.children(menu + ' li').length > 0) && collapsed.length > 0) {
            //  remove child from dropdown
            collapsed = $(menu + ' .dropdown-menu').children('li');
            $(collapsed[0]).insertBefore(nav.children(menu + ' li:last-child'));
            navHeight = nav.innerHeight();
        }

        if (navHeight > maxHeight) { 
            autocollapse(menu,maxHeight);
        }
    }
}

https://www.codeply.com/go/IETSah3bFG

You can use the navbar as this given example.

When you resize the browser the nav items will be moved inside to the drop-down if it not have an enough space.

Demo

[1]: http://jsfiddle.net/swasatz/3fn4d5oq/

Snippet Demo

Open the snippet in full page mode and resize the browser to see the changes.

$(document).ready(function () {
    var menu = $("#nav-bar-filter"),
        subMenu = $(".subfilter"),
        more = $("#more-nav"),
        parent = $(".filter-wrapper"),
        ww = $(window).width(),
        smw = more.outerWidth();

    menu.children("li").each(function () {
        var w = $(this).outerWidth();
        if (w > smw) smw = w + 20;
        return smw
    });
    more.css('width', smw);

    function contract() {
        var w = 0,
            outerWidth = parent.width() - smw - 50;
        for (i = 0; i < menu.children("li").size(); i++) {
            w += menu.children("li").eq(i).outerWidth();
            if (w > outerWidth) {
                menu.children("li").eq(i - 1).nextAll()
                    .detach()
                    .css('opacity', 0)
                    .prependTo(".subfilter")
                    .stop().animate({
                    'opacity': 1
                }, 300);
                break;
            }
        }
    }

    function expand() {
        var w = 0,
            outerWidth = parent.width() - smw - 20;
        menu.children("li").each(function () {
            w += $(this).outerWidth();
            return w;
        });
        for (i = 0; i < subMenu.children("li").size(); i++) {
            w += subMenu.children("li").eq(i).outerWidth();
            if (w > outerWidth) {
                var a = 0;
                while (a < i) {
                    subMenu.children("li").eq(a)
                        .css('opacity', 0)
                        .detach()
                        .appendTo("#nav-bar-filter")
                        .stop().animate({
                        'opacity': 1
                    }, 300);
                    a++;
                }
                break;
            }
        }
    }
    contract();

    $(window).on("resize", function (e) {
        ($(window).width() > ww) ? expand() : contract();
        ww = $(window).width();
    });

});

body {
    font-family: verdana;
    min-width: 250px;
}
ul#more-nav, ul#nav-bar-filter {
    display: inline-block;
    vertical-align: top;
}
ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}
li {
    padding: 4px 8px 4px 8px;
    margin: 0;
}
#nav-bar-filter li {
    display: inline-block;
    font-weight: bold;
}
a {
    text-decoration: none;
    color: #666;
    font-size: 13px;
}
.filter-wrapper {
    width: 100%;
    background: #eee;
    padding: 5px 10px 5px 10px;
}
#more-nav {
    float: right;
}
.subfilter{
    padding-top: 10px;
}
.subfilter li {
    margin: 0 0 0 20px;
    padding: 5px 0 0 0;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="twelve columns filter-wrapper">
    <ul class="nav-bar-filter" id="nav-bar-filter">
        <li><a href="#">All</a> 
        </li>
        <li><a href="#">Small</a>

        </li>
        <li><a href="#">Medium</a>

        </li>
        <li><a href="#">Extra large</a>

        </li>
        <li><a href="#">Text</a>

        </li>
        <li><a href="#">Small-1</a>

        </li>
        <li><a href="#">Medium-1</a>

        </li>
        <li><a href="#">Extra large text</a>

        </li>
        <li><a href="#">Large text</a>

        </li>
        <li><a href="#">Another text</a>

        </li>
        <li><a href="#">text</a>

        </li>
    </ul>
    <ul id="more-nav">
        <li><b><a href="#">More &gt;</a></b>

            <ul class="subfilter"></ul>
        </li>
    </ul>
</div>

Here is a natural Bootstrap 4 solution, with no JS or extra CSS required. Instead of using ul you can use div according to documentation and use display property to show or hide certain elements in navbar, including dropdown depending on screen size.

Here is what documentation says:

because we use classes for our navs, you can avoid the list-based approach entirely if you like. nav documentation

Here is an example, I added dropdown as div too:

<div class="navbar-nav ml-auto">
    <a class="nav-item nav-link" href="#">How does it work</a>
    <a class="nav-item nav-link" href="#">Demo</a>
    <div class="nav-item dropdown" href="#">
        <a class="nav-link dropdown-toggle" href="#" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a>
        <div class="dropdown-menu" aria-labelledby="dropdown01">
            <a class="dropdown-item" href="#">Action</a>
            <a class="dropdown-item" href="#">Another action</a>
            <a class="dropdown-item" href="#">Something else here</a>
        </div>
    </div>
    <a class="nav-item nav-link d-block d-lg-none d-xl-none" href="#">Show only on md and down</a>
    <a class="nav-item nav-link d-none d-lg-block d-md-block" href="#">Show on md and lg</a>
</div>

It's a working native solution. You can show / hide any element of nav this way on any screen size and it will show up in mobile menu too when collapsed.

P.S. no need in overflow:hidden too

Good luck!

For the menu-items that you would like to view as hidden on mobile devices, wrap a span around the list-item(s) that you want hidden and add the bootstrap 4 beta hidden values, like this.

<span class="d-none d-xs-block">
  <li class="nav-item">
    <a class="nav-link" href="#">aaaaaaaa 1234 </a>
  </li>
</span>

You can also apply the class to an <a> tag to hide that specific link within the drop-down menu. Furthermore, tinker with the d-xs-block class to meet your specifications.

I would like to provide you with a couple of sources to help guide you with regards to hiding elements at specific breakpoints.

• SO missing-visible-and-hidden-in-bootstrap-v4
• Example on codeply