Collapsible Search Bar I have an exposed form (from a view) in a block. I'd like to make this block collapsible so that a user is presented with a search box and one other field and when a user types in the search box the form expands out to include the remainder of the form fields. I know I can use ctools_collapsible to make content collapsible but how do I extend this to any div/region?
If I understood you correctly:
You have exposed filter in block, which have for example two fields, search by title and checkboxes.

So you can use: https://www.drupal.org/project/better_exposed_filters


After installing module: change Exposed form style from Basic to Better Exposed Filters
Click to BEF Settings
Check Enable secondary exposed form options
Expand yours fields what you need to hide before type in search box and check this: This is a secondary option
Use jQuery:

$("input.yourSearchBox").keyup(function(){

    $(".views-widget-filter-secondary a").trigger('click');

});