app/views/shared/_site_search_form.html.erb
<%= form_tag search_action_url, method: :get, class: 'd-flex flex-grow-1 search-across-form search-query-form', role: 'search', 'aria-label' => t('blacklight.search.form.submit') do %>
<%= render_hash_as_hidden_fields(search_state.params_for_search.except(:q, :search_field, :qt, :page, :utf8)) %>
<% if search_fields.length > 1 %>
<label for="search_field" class="sr-only"><%= t('blacklight.search.form.search_field.label') %></label>
<% end %>
<div class="input-group">
<div class="dropdown input-group-prepend" data-behavior="site-search-type-toggle" data-enabled="<%= in_search_across? ? '#item-search' : '#exhibit-search' %>" style="display: none">
<button type="button" class="btn btn-outline-secondary dropdown-toggle" id="site-search-type" data-toggle="dropdown" aria-expanded="false">
<% if in_search_across? %>
<%= t('.find_all_items') %>
<% else %>
<%= t('.find_exhibits_by_title') %>
<% end %>
</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#" data-target="#exhibit-search" data-button-text="<%= t('.find_exhibits_by_title') %>">
<%= t('.exhibits_by_title') %>
</a>
<a class="dropdown-item" href="#" data-target="#item-search" data-button-text="<%= t('.find_all_items') %>">
<%= t('.all_items') %>
</a>
</div>
</div>
<div class="exhibit-search-typeahead site-search-type" data-behavior="site-search-type" id="exhibit-search" style="display: none;">
<input type="text" class="form-control" role="combobox" aria-labelledby="site-search-type" data-behavior="exhibit-search-typeahead" data-typeahead-remote-url="<%= exhibit_finder_index_path %>" />
</div>
<div id="item-search" class="site-search-type" data-behavior="site-search-type">
<div class="input-group">
<%= hidden_field_tag :search_field, search_fields.first.last %>
<noscript>
<label for="q" class="sr-only"><%= t('blacklight.search.form.search.label') %></label>
</noscript>
<%= text_field_tag :q, params[:q], class: "search-q q form-control", id: "q", 'aria-labelledby': "site-search-type", autofocus: presenter.autofocus?, data: { autocomplete_enabled: presenter.autocomplete_enabled?, autocomplete_path: search_action_path(action: :suggest) } %>
<span class="input-group-append">
<button type="submit" class="btn btn-primary search-btn" id="search">
<span class="submit-search-text"><%= t('blacklight.search.form.submit') %></span>
<%= blacklight_icon :search, aria_hidden: true %>
</button>
</span>
</div>
</div>
</div>
<% end %>