NerdDiffer/job_tracker

<div class='companies search_filter category_select'>
  <span>Filter by category:</span>
  <% hidden_field_tag('category_names', params[:category_names]) %>
  <% tags = options_for_select(
       generate_select_opts_for_category_names,
       params[:category_names]
  ) %>
  <% opts = { multiple: true, size: 10 } %>
  <%= select_tag('category_names', tags, opts) %>
<div>