Fixed #29284 -- Made ImageField render with accept="image/*"' HTML attribute.

django/forms/fields.py

@@ -20,7 +20,7 @@ from django.forms.boundfield import BoundField
 from django.forms.utils import from_current_timezone, to_current_timezone
 from django.forms.widgets import (
     FILE_INPUT_CONTRADICTION, CheckboxInput, ClearableFileInput, DateInput,
-    DateTimeInput, EmailInput, HiddenInput, MultipleHiddenInput,
+    DateTimeInput, EmailInput, FileInput, HiddenInput, MultipleHiddenInput,
     NullBooleanSelect, NumberInput, Select, SelectMultiple,
     SplitDateTimeWidget, SplitHiddenDateTimeWidget, TextInput, TimeInput,
     URLInput,
@@ -646,6 +646,12 @@ class ImageField(FileField):
             f.seek(0)
         return f
 
+    def widget_attrs(self, widget):
+        attrs = super().widget_attrs(widget)
+        if isinstance(widget, FileInput) and 'accept' not in widget.attrs:
+            attrs.setdefault('accept', 'image/*')
+        return attrs
+
 
 class URLField(CharField):
     widget = URLInput

docs/releases/2.1.txt

@@ -166,7 +166,8 @@ File Uploads
 Forms
 ~~~~~
 
-* ...
+* The widget for ``ImageField`` now renders with the HTML attribute
+  ``accept="image/*"``.
 
 Generic Views
 ~~~~~~~~~~~~~

tests/forms_tests/field_tests/test_imagefield.py

@@ -2,9 +2,13 @@ import os
 import unittest
 
 from django.core.files.uploadedfile import SimpleUploadedFile
-from django.forms import ImageField, ValidationError
+from django.forms import (
+    ClearableFileInput, FileInput, ImageField, ValidationError, Widget,
+)
 from django.test import SimpleTestCase
 
+from . import FormFieldAssertionsMixin
+
 try:
     from PIL import Image
 except ImportError:
@@ -16,7 +20,7 @@ def get_img_path(path):
 
 
 @unittest.skipUnless(Image, "Pillow is required to test ImageField")
-class ImageFieldTest(SimpleTestCase):
+class ImageFieldTest(FormFieldAssertionsMixin, SimpleTestCase):
 
     def test_imagefield_annotate_with_image_after_clean(self):
         f = ImageField()
@@ -64,3 +68,21 @@ class ImageFieldTest(SimpleTestCase):
         img_file = SimpleUploadedFile('1x1.txt', img_data)
         with self.assertRaisesMessage(ValidationError, "File extension 'txt' is not allowed."):
             f.clean(img_file)
+
+    def test_widget_attrs_default_accept(self):
+        f = ImageField()
+        # Nothing added for non-FileInput widgets.
+        self.assertEqual(f.widget_attrs(Widget()), {})
+        self.assertEqual(f.widget_attrs(FileInput()), {'accept': 'image/*'})
+        self.assertEqual(f.widget_attrs(ClearableFileInput()), {'accept': 'image/*'})
+        self.assertWidgetRendersTo(f, '<input type="file" name="f" accept="image/*" required id="id_f" />')
+
+    def test_widge_attrs_accept_specified(self):
+        f = ImageField(widget=FileInput(attrs={'accept': 'image/png'}))
+        self.assertEqual(f.widget_attrs(f.widget), {})
+        self.assertWidgetRendersTo(f, '<input type="file" name="f" accept="image/png" required id="id_f" />')
+
+    def test_widge_attrs_accept_false(self):
+        f = ImageField(widget=FileInput(attrs={'accept': False}))
+        self.assertEqual(f.widget_attrs(f.widget), {})
+        self.assertWidgetRendersTo(f, '<input type="file" name="f" required id="id_f" />')