Disable dropup feature using Bootstrap Select

Options can be passed via JavaScript or data attributes:

$('.selectpicker').selectpicker({
    dropupAuto: false
});

or

<select class="selectpicker" data-dropup-auto="false">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
</select>

You can also set this globally:

$.fn.selectpicker.Constructor.DEFAULTS.dropupAuto = false;

This setting can be changed in the bootstrap-select.js file by editing the dropupAuto option to:

dropupAuto: false,