text-center and text-right not working in bootstrap

Question

I want some elements on my page to align to the center and right, but the bootstrap classes 'text-right' and 'text-center' don't seem to work, even though 'text-left' does.

Thanks.

<div class="container-fluid">
    <div class="row text-center" id="header">
        <div class="col-xs-12">
            <div class="container" style="padding-left:30px; padding-right:30px;">
                <div class="col-xs-2 text-left" id="mainLogo">
                    <a href="/"><img src="/stylesheet/main_logo.png" ></a>
                </div>

                <div class="col-xs-6 text-right">
                    <ul class="nav nav-pills">
                        <li role="presentation" class="dropdown">
                            <a class="dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-expanded="false">
                                <span class="glyphicon glyphicon-user"></span> Account <span class="caret"></span>
                            </a>
                            <ul class="dropdown-menu" role="menu">
                                <li id="ctl00">
                                    <a href="/account/">Your Account</a>
                                </li>
                                <li id="user">
                                    <a href="/profile/">Profile</a>
                                </li>
                                <li id="panel">
                                    <a href="/shop/reviewbasket/">Basket</a>
                                </li>
                            </ul>
                        </li>
                    </ul>
                </div>

                <div class="col-xs-4 text-right">
                    <div id="search">
                 </div>     
                </div>
                </div>
            </div>
        </div>
    </div>

Answer 1

For those using Bootstrap 5 be aware that text-left and text-right classes have been removed. Now you can use text-start and text-end .

Answer 2

text-right only works on inline elements. UL is a block element so you'd use pull-right like this..

<div class="col-xs-6">
     <ul class="nav nav-pills pull-right"> 
         ...

Answer 3

In bootstrap 4 there's new class float-right . So it'd be like above but:

<div class="col-xs-6">
     <ul class="nav nav-pills float-right"> 
         ...