Twitter Bootstrap inline input with dropdown

Current state: default implementation in docs

Currently there is a default implementation of input+dropdown combo in the documentation here (search for "Button dropdowns"). I leave the original solution for the record and for those who cannot use solution now included in the documentation.

Original solution

Yes, it is possible. As a matter of fact, there is one example in the Twitter Bootstrap documentation (follow the link and search "Examples" for dropdown buttons):

<div class="btn-group">
    <a class="btn btn-primary" href="#">
        <i class="icon-user icon-white"></i> User
    </a>
    <a class="btn btn-primary dropdown-toggle" data-toggle="dropdown" href="#">
        <span class="caret"></span>
    </a>
    <ul class="dropdown-menu">
        <li><a href="#"><i class="icon-pencil"></i> Edit</a></li>
        <li><a href="#"><i class="icon-trash"></i> Delete</a></li>
        <li><a href="#"><i class="icon-ban-circle"></i> Ban</a></li>
        <li class="divider"></li>
        <li><a href="#"><i class="i"></i> Make admin</a></li>
    </ul>
</div>

If enclosed within text, it can look like this (with text on the button changed, nothing else):

EDIT:

If you are trying to achieve <input> with appended dropdown menu as in the dropdown buttons, then this is one of the solutions:

1. Add a btn-group class to the element that has input-append class,
2. Add elements with classes dropdown-toggle and dropdown-menu at the end of the element with class input-append,
3. Override style for element matching .input-append .btn.dropdown-menu so it does not have float: left (otherwise it will get into next line).

The resulting code may look like this:

<div class="input-append btn-group">
    <input class="span2" id="appendedInputButton" size="16" type="text">
    <a class="btn btn-primary dropdown-toggle" data-toggle="dropdown" href="#">
        <span class="caret"></span>
    </a>
    <ul class="dropdown-menu">
        <li><a href="#"><i class="icon-pencil"></i> Edit</a></li>
        <li><a href="#"><i class="icon-trash"></i> Delete</a></li>
        <li><a href="#"><i class="icon-ban-circle"></i> Ban</a></li>
        <li class="divider"></li>
        <li><a href="#"><i class="i"></i> Make admin</a></li>
    </ul>
</div>

with a little support from this style override:

.input-append .btn.dropdown-toggle {
    float: none;
}

and give you the exact same result as this:

EDIT 2: Updated the CSS selector (was .dropdown-menu, is .dropdown-toggle).

As of Bootstrap 3.x, there's an example of this in the docs here: http://getbootstrap.com/components/#input-groups-buttons-dropdowns

<div class="input-group">
  <input type="text" class="form-control" aria-label="...">
  <div class="input-group-btn">
    <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Action <span class="caret"></span></button>
    <ul class="dropdown-menu dropdown-menu-right" role="menu">
      <li><a href="#">Action</a></li>
      <li><a href="#">Another action</a></li>
      <li><a href="#">Something else here</a></li>
      <li class="divider"></li>
      <li><a href="#">Separated link</a></li>
    </ul>
  </div><!-- /btn-group -->
</div><!-- /input-group -->

Search for the "datalist" tag.

<input list="texto_pronto" name="input_normal">
<datalist id="texto_pronto">
    <option value="texto A">
    <option value="texto B">
</datalist>