Give your links a class (e.g. download):
<a href="#" class="download" data-bind="disable: noResults()....
And your dropdown an id (e.g. dlDropDown):
<button class="btn dropdown-toggle" id="dlDropDown" data-toggle="dropdown" data-bind="enable: !noResults()">
And then add the following event handler:
$("a.download").click(function() {
$("#dlDropDown").dropdown("toggle");
});