Allow widget rendering customization through form_widget_args property

flask_admin/model/base.py

@@ -259,6 +259,22 @@ class BaseModelView(BaseView, ActionsMixin):
                 form_overrides = dict(name=wtf.FileField)
     """
 
+    form_widget_args = None
+    """
+        Dictionary of form widget rendering arguments.
+        Use this to customize how widget is rendered without using custom template.
+
+        Example::
+
+            class MyModelView(BaseModelView):
+                form_widget_args = {
+                    'description': {
+                        'rows': 10,
+                        'style': 'color: black'
+                    }
+                }
+    """
+
     # Actions
     action_disallowed_list = ObsoleteAttr('action_disallowed_list',
                                           'disallowed_actions',
@@ -327,6 +343,9 @@ class BaseModelView(BaseView, ActionsMixin):
         self._create_form_class = self.get_create_form()
         self._edit_form_class = self.get_edit_form()
 
+        if self.form_widget_args is None:
+            self.form_widget_args = {}
+
         # Search
         self._search_supported = self.init_search()
 
@@ -569,7 +588,7 @@ class BaseModelView(BaseView, ActionsMixin):
     def get_list(self, page, sort_field, sort_desc, search, filters):
         """
             Return a paginated and sorted list of models from the data source.
-            
+
             Must be implemented in the child class.
 
             :param page:
@@ -902,6 +921,7 @@ class BaseModelView(BaseView, ActionsMixin):
 
         return self.render(self.create_template,
                            form=form,
+                           form_widget_args=self.form_widget_args,
                            return_url=return_url)
 
     @expose('/edit/', methods=('GET', 'POST'))
@@ -931,6 +951,7 @@ class BaseModelView(BaseView, ActionsMixin):
 
         return self.render(self.edit_template,
                                form=form,
+                               form_widget_args=self.form_widget_args,
                                return_url=return_url)
 
     @expose('/delete/', methods=('POST',))

flask_admin/templates/admin/lib.html

@@ -73,7 +73,7 @@
 {% endif %}
 {%- endmacro %}
 
-{% macro render_field(form, field, set_focus=False) %}
+{% macro render_field(form, field, set_focus=False, kwargs={}) %}
   <div class="control-group{{ ' error' if field.errors }}">
     <div class="control-label">
       {{ field.label.text }}
@@ -86,9 +86,9 @@
     <div class="controls">
     <div>
       {% if set_focus %}
-      {{ field(autofocus='autofocus')|safe }}
+      {{ field(autofocus='autofocus', **kwargs)|safe }}
       {% else %}
-      {{ field()|safe }}
+      {{ field(**kwargs)|safe }}
       {% endif %}
     </div>
     {% if field.description %}
@@ -105,11 +105,12 @@
   </div>
 {% endmacro %}
 
-{% macro render_form_fields(form, set_focus=True) %}
+{% macro render_form_fields(form, set_focus=True, widget_args={}) %}
     {{ form.hidden_tag() if form.hidden_tag is defined }}
 
     {% for f in form if f.type != 'HiddenField' and f.type != 'CSRFTokenField' %}
-      {{ render_field(form, f, not loop.index0 and set_focus) }}
+      {% set kwargs = widget_args.get(f.name, {}) %}
+      {{ render_field(form, f, not loop.index0 and set_focus, kwargs) }}
     {% endfor %}
 {% endmacro %}
 
@@ -135,9 +136,9 @@
     </div>
 {% endmacro %}
 
-{% macro render_form(form, cancel_url, extra=None) -%}
+{% macro render_form(form, cancel_url, extra=None, widget_args={}) -%}
     {% call form_tag() %}
-        {{ render_form_fields(form) }}
+        {{ render_form_fields(form, widget_args) }}
         {{ render_form_buttons(cancel_url, extra) }}
     {% endcall %}
 {% endmacro %}

flask_admin/templates/admin/model/create.html

@@ -21,7 +21,7 @@
   {% endmacro %}
 
   {% call lib.form_tag() %}
-      {{ lib.render_form_fields(form) }}
+      {{ lib.render_form_fields(form, widget_args=form_widget_args) }}
       {{ lib.render_form_buttons(return_url, extra()) }}
   {% endcall %}
 {% endblock %}

flask_admin/templates/admin/model/edit.html

@@ -8,7 +8,7 @@
 
 {% block body %}
     {% call lib.form_tag() %}
-        {{ lib.render_form_fields(form) }}
+        {{ lib.render_form_fields(form, widget_args=form_widget_args) }}
         {{ lib.render_form_buttons(return_url) }}
     {% endcall %}
 {% endblock %}

flask_admin/tests/test_model.py

@@ -291,6 +291,7 @@ def test_form():
     # TODO: form_columns
     # TODO: form_excluded_columns
     # TODO: form_args
+    # TODO: form_widget_args
     pass