feat: pass extra alert_message keyword arguments through to div as attributes

README.md

@@ -1573,20 +1573,20 @@ By default, turning on `:label_errors` will also turn off
 
 To display an error message with an error summary, you can use the
 `alert_message` helper. This won't output anything unless a model validation
-has failed.
+has failed, and additional options will be passed on as attributes to the root `div`:
 
 ![Example 49](demo/doc/screenshots/bootstrap/readme/49_example.png "Example 49")
 ```erb
 <%= bootstrap_form_for @user_with_error do |f| %>
-  <%= f.alert_message "Please fix the errors below." %>
+  <%= f.alert_message "Please fix the errors below.", tabindex: -1, role: "note" %>
 <% end %>
 ```
 
 Which outputs:
 
 ```html
 <form accept-charset="UTF-8" action="/users" class="new_user" id="new_user" method="post">
-  <div class="alert alert-danger">
+  <div class="alert alert-danger" tabindex="-1" role="note">
     <p>Please fix the errors below.</p>
     <ul class="rails-bootstrap-forms-error-summary">
       <li>Email is invalid</li>

lib/bootstrap_form/helpers/bootstrap.rb

@@ -9,7 +9,7 @@ def alert_message(title, options={})
         css = options[:class] || "alert alert-danger"
         return unless object.respond_to?(:errors) && object.errors.full_messages.any?
 
-        tag.div class: css do
+        tag.div class: css, **options.except(:class, :error_summary) do
           if options[:error_summary] == false
             title
           else

test/bootstrap_form_test.rb

@@ -593,6 +593,23 @@ def warn(message, ...)
     assert_equivalent_html expected, @builder.alert_message("Please fix the following errors:", class: "my-css-class")
   end
 
+  test "alert_message passes extra options through as HTML attributes" do
+    @user.email = nil
+    assert @user.invalid?
+
+    expected = <<~HTML
+      <div class="alert alert-danger" tabindex="-1" role="note">
+        <p>Please fix the following errors:</p>
+        <ul class="rails-bootstrap-forms-error-summary">
+          <li>Email can't be blank</li>
+          <li>Email is too short (minimum is 5 characters)</li>
+          <li>Terms must be accepted</li>
+        </ul>
+      </div>
+    HTML
+    assert_equivalent_html expected, @builder.alert_message("Please fix the following errors:", tabindex: "-1", role: "note")
+  end
+
   test "alert_message contains the error summary when inline_errors are turned off" do
     @user.email = nil
     assert @user.invalid?