add option submits_with to button

README.md

@@ -1065,6 +1065,20 @@ will be rendered as
 
 (some unimportant HTML attributes have been removed for simplicity)
 
+### Turbo submits with
+There is a turbo attribute [(data-turbo-submits-with)](https://turbo.hotwired.dev/reference/attributes) that replaces the content of a submit button while the request is processing.
+```erb
+<%= f.button "Save", submits_with: :spinner %>
+```
+
+```html
+<button class="btn btn-secondary" data-turbo-submits-with="<div class="spinner-border d-block mx-auto"; role="status" style="--bs-spinner-width: 1lh; --bs-spinner-height: 1lh;"></div>" name="button" type="submit">Save</button>
+```
+
+Use `submits_with: :spinner` to render a default bootstrap spinner or pass your own HTML.
+This only works on `f.button` or `f.primary` not on `f.submit` and forces `render_as_button: true` on `f.primary`.
+
+
 ## Rich Text Areas AKA Trix Editor
 
 ![Example 38](demo/doc/screenshots/bootstrap/readme/38_example.png "Example 38")

lib/bootstrap_form/inputs/submit.rb

@@ -4,6 +4,10 @@ module BootstrapForm
   module Inputs
     module Submit
       def button(value=nil, options={}, &)
+        if options.key? :submits_with
+          options[:data] = { turbo_submits_with: setup_turbo_submit(options[:submits_with]) }
+          options.except! :submits_with
+        end
         value = setup_css_class "btn btn-secondary", value, options
         super
       end
@@ -16,7 +20,7 @@ def submit(value=nil, options={})
       def primary(value=nil, options={}, &block)
         value = setup_css_class "btn btn-primary", value, options
 
-        if options[:render_as_button] || block
+        if options[:render_as_button] || options[:submits_with] || block
           options.except! :render_as_button
           button(value, options, &block)
         else
@@ -39,6 +43,17 @@ def setup_css_class(the_class, value, options)
         end
         value
       end
+
+      def setup_turbo_submit(submits_with)
+        case submits_with
+        when :spinner, "spinner"
+          <<~HTML.strip
+            <div class="spinner-border d-block mx-auto" role="status" style="--bs-spinner-width: 1lh; --bs-spinner-height: 1lh;"></div>
+          HTML
+        else
+          submits_with.to_s
+        end
+      end
     end
   end
 end

test/bootstrap_other_components_test.rb

@@ -152,6 +152,22 @@ class BootstrapOtherComponentsTest < ActionView::TestCase
                            @builder.button("<span>I'm HTML!</span> in a button!".html_safe, extra_class: "test-button")
   end
 
+  test "regular button has turbo-submits-with deafault spinner" do
+    expected = <<~HTML
+      <button class="btn btn-secondary" data-turbo-submits-with="<div class=&quot;spinner-border d-block mx-auto&quot; role=&quot;status&quot; style=&quot;--bs-spinner-width: 1lh; --bs-spinner-height: 1lh;&quot;></div>" name="button" type="submit">Submit with Spinner</button>
+    HTML
+    assert_equivalent_html expected,
+                           @builder.button("Submit with Spinner", submits_with: :spinner)
+  end
+
+  test "regular button has turbo-submits-with custom HTML" do
+    expected = <<~HTML
+      <button class="btn btn-secondary" data-turbo-submits-with="<span>Loading...</span>" name="button" type="submit">Submit with Spinner</button>
+    HTML
+    assert_equivalent_html expected,
+                           @builder.button("Submit with Spinner", submits_with: "<span>Loading...</span>".html_safe)
+  end
+
   test "submit button defaults to rails action name" do
     expected = '<input class="btn btn-secondary" name="commit" type="submit" value="Create User" />'
     assert_equivalent_html expected, @builder.submit