How to Restrict Width of Bootstrap 3 Dropdown-Menu in Navbar

How To Restrict Width of Bootstrap 3 Dropdown-Menu in Navbar

Explanation

Bootstrap's adds position: absolute to the .dropdown-menu class. As you may know, all absolutely positioned elements are positioned in relation to the first parent element they find with position: relative. In Bootstrap, this is provided by the .dropdown wrapper

So if you want to position the element relative to the container, and not the nav item, we'll have to remove relative positioning from the .dropdown wrapper. You can do this by resetting the value to the initial value for the position property, which is static.

Congratulations! The menu is no longer constrained by the .dropdown element, but we still have some work to do.

Because bootstrap was not intending to space constrain the menu, menu items are given the property white-space: nowrap so they'll extend as long as they need. Think lines of code inside code blocks here on stack overflow (1 line = 1 line). Since we want the line to eventually end, this won't do. So we'll reset the anchor tags back to white-space: normal.

At this point the .dropdown-menu should take up the full size of the .navbar (which itself takes up the full size of the .container). This is where yamm3 is doing something really cool. It sets left: auto on the dropdown-menu.

According to MDN on the left property:

auto is a keyword that represents:

for absolutely positioned elements, the position of the element based on the right property and treat width: auto as a width based on the content.

So setting the .dropdown-menu to left:auto will cause the menu to start in its current location and extend all the way to the right of the container.

Just Codes

Just add the .fill-width class to your .dropdown element and include the following CSS:

.fill-width.dropdown {
    position: static;
}
.fill-width.dropdown > .dropdown-menu {
    left: auto;
}
.fill-width.dropdown > .dropdown-menu > li > a {
   white-space: normal; 
}

Working Demo in jsFiddle

.full-width.dropdown {
    position: static;
}
.full-width.dropdown > .dropdown-menu {
    right: 0;
}
.full-width.dropdown > .dropdown-menu > li > a {
   white-space: normal; 
}

.fill-width.dropdown {
    position: static;
}
.fill-width.dropdown > .dropdown-menu {
    left: auto;
}
.fill-width.dropdown > .dropdown-menu > li > a {
   white-space: normal; 
}

<link rel="stylesheet" type="text/css" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript" src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>

<div class="container">
    <div class="navbar navbar-inverse">

        <!-- Header -->
        <div class="navbar-header">
            <button type="button" class="navbar-toggle" 
                    data-toggle="collapse" 
                    data-target=".navbar-collapse">
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="#">
                Bootstrap 3 Skeleton
            </a>
        </div>
        <!-- Navbar Links -->
        <div class="collapse navbar-collapse">
            <ul class="nav navbar-nav">
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" 
                    data-toggle="dropdown">
                        Normal <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="#">Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Long
                            </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>   
                <li class="dropdown full-width">
                    <a href="#" class="dropdown-toggle" 
                    data-toggle="dropdown">
                        Full Width <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="#">Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Long
                            </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>          
                <li class="dropdown fill-width">
                    <a href="#" class="dropdown-toggle" 
                    data-toggle="dropdown">
                        Fill Width <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="#">Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Really Long
                            </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>
    </div>
</div>

How to set width on dropdown item in bootstrap?

There is a min-width on the dropdown menu in bootstrap.
You can reset it like this:

.dropdown-menu {
  min-width:inherit;
}

Bootstrap 3 Dropdown full width

Remove position: relative from the dropdown parents and make it relative for the full width bar. Position Relative makes any absolute children use that as it's positioning reference point.

If you add the following to the bottom of the CSS you'll get the effect you need.

.categorydropadjust, .dropdown {
position: static;
}
.container-fluid {
position: relative;
}
.dropdown-menu {
width: 100%;
}


https://jsfiddle.net/gswna389/3/

How to make this dropdown menu full width underneath the navbar?

I dont know exactly what you need if my thought is right you want this link , check with the bootstrap mega menu

click here

bootstrap navbar list dropdown extends far too wide

If you don't want to give a fixed width, then you may use max-width.
It will not set any fixed width but when the text will exceed the given max-width, it will automatically break down to a new line.

How to reduce the width of dropdown-menu?

.dropdown-menu has min-width: 160px; and min-width overrides width so you can not change width you can use min-width instead of width.

.dropdown-menu {  min-width: 60px !important;}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script><script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script><link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" />

<div class="dropdown">  <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">    Dropdown    <span class="caret"></span>  </button>  <ul class="dropdown-menu" aria-labelledby="dropdownMenu1">    <li><a href="#">Action</a>    </li>    <li><a href="#">Another</a>    </li>    <li><a href="#">Something</a>    </li>    <li><a href="#">Separated</a>    </li>  </ul></div>

How to make width of dropdown-menu equal to width of it's parent in bootstrap 4

dropdown-menu has position:absolute property. So, adding width:100%; will make the dropdown-menu to take full width of the page instead of taking full width of container. To make the dropdown-menu take the width of it's parent element make the parent element's positioning relative. To solve the problem first Add class="position-relative" attribute to the parent element of dropdown-menu. Now add w-100 to the class attribute of the dropdown-menu div.

<div class="container position-relative">
<button class="dropdown-toggle btn-block" data-toggle="dropdown">
  dropdown
</button>
<div class="dropdown-menu w-100">
  <a href="" class="dropdown-item">one</a>
  <a href="" class="dropdown-item">two</a>
  <a href="" class="dropdown-item">three</a>
  <a href="" class="dropdown-item">four</a>
</div>

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