Pass the complete snippet chooser URL as a data attribute, rather than tacking on the model parameter in JS.

I think that's a throwback to when the chooser URL was being passed to the page as a constant in window.chooserUrls...

client/src/entrypoints/snippets/snippet-chooser.js

@@ -7,7 +7,7 @@ function createSnippetChooser(id, modelString) {
   const docTitle = chooserElement.find('.title');
   const input = $('#' + id);
   const editLink = chooserElement.find('.edit-link');
-  const chooserBaseUrl = chooserElement.data('chooserUrl') + modelString + '/';
+  const chooserBaseUrl = chooserElement.data('chooserUrl');
 
   /*
   Construct initial state of the chooser from the rendered (static) HTML and arguments passed to

wagtail/snippets/templates/wagtailsnippets/widgets/snippet_chooser.html

@@ -4,4 +4,4 @@
 {% block unchosen_icon %}{% icon name="snippet" %}{% endblock unchosen_icon %}
 {% block chosen_icon %}{% icon name="snippet" %}{% endblock chosen_icon %}
 {% block chooser_class %}snippet-chooser{% endblock %}
-{% block chooser_attributes %}data-chooser-url="{% url 'wagtailsnippets:choose_generic' %}"{% endblock %}
+{% block chooser_attributes %}data-chooser-url="{{ chooser_url }}"{% endblock %}

wagtail/snippets/urls.py

@@ -7,7 +7,6 @@ app_name = 'wagtailsnippets'
 urlpatterns = [
     path('', snippets.index, name='index'),
 
-    path('choose/', chooser.choose, name='choose_generic'),
     path('choose/<slug:app_label>/<slug:model_name>/', chooser.choose, name='choose'),
     path('choose/<slug:app_label>/<slug:model_name>/<str:pk>/', chooser.chosen, name='chosen'),
 

wagtail/snippets/widgets.py

@@ -48,6 +48,9 @@ class AdminSnippetChooser(AdminChooser):
         value_data = value_data or {}
 
         original_field_html = super().render_html(name, value_data.get('id'), attrs)
+        chooser_url = reverse(
+            'wagtailsnippets:choose', args=[self.target_model._meta.app_label, self.target_model._meta.model_name]
+        )
 
         return render_to_string("wagtailsnippets/widgets/snippet_chooser.html", {
             'widget': self,
@@ -56,6 +59,7 @@ class AdminSnippetChooser(AdminChooser):
             'value': bool(value_data),  # only used by chooser.html to identify blank values
             'display_title': value_data.get('string', ''),
             'edit_url': value_data.get('edit_url', ''),
+            'chooser_url': chooser_url,
         })
 
     @property