Make skip of trigger form in UI if no params are defined configurable

airflow/config_templates/config.yml

@@ -1779,6 +1779,15 @@ webserver:
       type: string
       example: "sha256"
       default: "md5"
+    skip_trigger_form_if_no_params:
+      description: |
+        Behavior of the trigger DAG run button for DAGs without params. True to skip and trigger
+        without displaying a form to add a dag_run.conf, False to always display the form.
+        The form is displayed always if parameters are defined.
+      version_added: 2.7.0
+      type: boolean
+      example: ~
+      default: "True"
 email:
   description: |
     Configuration email backend and whether to

airflow/www/views.py

@@ -2031,6 +2031,7 @@ def trigger(self, dag_id: str, session: Session = NEW_SESSION):
                     form_fields[k]["schema"]["custom_html_form"]
                 )
         ui_fields_defined = any("const" not in f["schema"] for f in form_fields.values())
+        show_form_if_no_params = not conf.getboolean("webserver", "skip_trigger_form_if_no_params")
 
         if not dag_orm:
             flash(f"Cannot find dag {dag_id}")
@@ -2057,7 +2058,7 @@ def trigger(self, dag_id: str, session: Session = NEW_SESSION):
             if isinstance(run_conf, dict) and any(run_conf)
         }
 
-        if request.method == "GET" and ui_fields_defined:
+        if request.method == "GET" and (ui_fields_defined or show_form_if_no_params):
             # Populate conf textarea with conf requests parameter, or dag.params
             default_conf = ""