Redmine/app/views/custom_fields/_form.rhtml

<%= error_messages_for 'custom_field' %>

<script>
function toggle_custom_field_format() {
  format = $("custom_field_field_format");
  p_length = $("custom_field_min_length");
  p_regexp = $("custom_field_regexp");
  p_values = $("custom_field_possible_values");
  switch (format.value) {
    case "list":
      Element.hide(p_length.parentNode);
      Element.hide(p_regexp.parentNode);
      Element.show(p_values.parentNode);
      break;
    case "int":
    case "string":
    case "text":
      Element.show(p_length.parentNode);
      Element.show(p_regexp.parentNode);
      Element.hide(p_values.parentNode);
      break;
    case "date":
    case "bool":
      Element.hide(p_length.parentNode);
      Element.hide(p_regexp.parentNode);
      Element.hide(p_values.parentNode);
      break;
    default:
      Element.show(p_length.parentNode);
      Element.show(p_regexp.parentNode);
      Element.show(p_values.parentNode);
      break;
  }
}
</script>

<!--[form:custom_field]-->
<div class="box">
<p><%= f.text_field :name, :required => true %></p>
<p><%= f.select :field_format, custom_field_formats_for_select, {}, :onchange => "toggle_custom_field_format();" %></p>
<p><label for="custom_field_min_length"><%=l(:label_min_max_length)%></label>
   <%= f.text_field :min_length, :size => 5, :no_label => true %> - 
   <%= f.text_field :max_length, :size => 5, :no_label => true %><br>(<%=l(:text_min_max_length_info)%>)</p>
<p><%= f.text_field :regexp, :size => 50 %><br>(<%=l(:text_regexp_info)%>)</p>
<p><%= f.text_area :possible_values, :rows => 5, :cols => 60 %><br>(<%=l(:text_possible_values_info)%>)</p>
</div>
<%= javascript_tag "toggle_custom_field_format();" %>
<!--[eoform:custom_field]-->

<div class="box">
<% case @custom_field.type.to_s
when "IssueCustomField" %>
    
    <fieldset><legend><%=l(:label_tracker_plural)%></legend>
    <% for tracker in @trackers %>
        <%= check_box_tag "tracker_ids[]", tracker.id, (@custom_field.trackers.include? tracker) %> <%= tracker.name %>
    <% end %>
    </fieldset>
    &nbsp;
    <p><%= f.check_box :is_required %></p>
    <p><%= f.check_box :is_for_all %></p>
    
<% when "UserCustomField" %>
    <p><%= f.check_box :is_required %></p>

<% when "ProjectCustomField" %>
    <p><%= f.check_box :is_required %></p>

<% end %>
</div>