Support for Dropup variation

[eranimo]

I like how the select2 dropdown changes to a "dropup" instead of a dropdown when there is no room at the bottom of the viewport for the dropdown to show. It would be nice if we could support this feature. A dropup style is already included in Bootstrap:

http://getbootstrap.com/components/#btn-dropdowns-dropup

[bsweeney]

You can manually specify the dropup variant if you follow the dropdown class with the dropup class, e.g.

<div class="dropdown dropup">
  <button class="dropdown-toggle btn" data-toggle="dropdown">
    Click Me <span class="caret"></span>
  </button>
  <ul class="dropdown-menu" role="menu" aria-labelledby="selectDropdown">
    <li role="presentation"><a role="menuitem" tabindex="-1">Yo!</a></li>
  </ul>
</div>

But I totally agree, having it automatically choose would be nice.

[bsweeney]

Looks to be a similar request to #1317.

[pkozlowski-opensource]

Yes, this is duplicate of #1317