Bootstrap horizontal drop down

Question

Take a look at this picture:

I want the dropdown menu items to be stack from left to right (horizontally). I cannot seem get this to work, tried using "list-inline" class mentioned in the official documentation, that only makes things worse.

Here's the HTML:

<nav class="navbar navbar-default navbar-static-top" role="navigation">
    <ul class="nav navbar-nav">
        <li class="dropdown">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown">List Item</a>
            <ul class="dropdown-menu">
                <li><a href="#" id="">1</a></li>
                <li><a href="#" id="">2</a></li>
                <li><a href="#" id="">1</a></li>
                <li><a href="#" id="">2</a></li>
                <li><a href="#" id="">3</a></li>
                <li><a href="#" id="">4</a></li>
                <li><a href="#" id="">5</a></li>
                <li><a href="#" id="">6</a></li>
            </ul>
        </li>
    </ul>
</nav>  

I'm using Bootstrap 3

Answer 1

Enclose those li into a ul list and the class as list-inline like this

<ul class="dropdown-menu">
                <ul class='list-inline'>
                    <li><a href="#" id="">1</a>
                    </li>
                    <li><a href="#" id="">2</a>
                    </li>
                    <li><a href="#" id="">3</a>
                    </li>
                    <li><a href="#" id="">4</a>
                    </li>
                    <li><a href="#" id="">5</a>
                    </li>
                </ul>
</ul>

Check this screenshot

Here is the JSFiddle

Updates1:

As I mentioned in comments, class: dropdown-menu has the min-width as 160px. Hence it is fixed to width. Try to override it.

Updates2:

As I mentioned in comments, bootstrap has some default style which can be overridden like

.dropdown-menu{
min-width: 200px;
}

Incase if you feel that it affects other elements then override using id selector.

#Numberlist.dropdown-menu{
min-width: 200px;
}

Find the difference in this JSFiddle

Answer 2

the dropdown-menu is restricted by the width of it's li container.

just add :

.dropdown-menu {
    margin-right:-1000px;
}

.dropdown-menu > li {
    display: inline-block;
}