you can choose the container id of the widget now

README.md

@@ -51,8 +51,8 @@ You can pass some parameters into the widget contructor:
 
 ```python
 class ReCaptchaWidget(Widget):
-    def __init__(self, explicit=False, theme=None, type=None, size=None, tabindex=None, callback=None,
-                 expired_callback=None, attrs={}, *args, **kwargs):
+    def __init__(self, explicit=False, container_id=None, theme=None, type=None, size=None, tabindex=None,
+                 callback=None, expired_callback=None, attrs={}, *args, **kwargs):
 ```
 
 If you set the explicit boolean to true, you will render this field with explicit render support. This is useful if you
@@ -62,6 +62,18 @@ You can personalize reCaptcha theme, type, size, tabindex, callback and expired_
 <a href="https://developers.google.com/recaptcha/docs/display#config">documentation</a> if you want to change those values.
 Warning: the app doesn't validate the incoming parameter values.
 
+### Recaptcha "container id"
+Now the default container id for the recaptcha is:
+
+* recaptcha-{$fieldname} for the automatic rendering
+* recaptcha-{$fieldname}-{%fiverandomdigits} for the explicit rendering
+
+This avoids name collisions when you use multiple instances of the recaptcha in different forms, but in the same page
+and with the same field name.
+
+**Note:** you can always override the container id with the "container_id" argument in the widget constructor, but take
+care: nobody will check if the id you provide is already used.
+
 ### Templating
 You can use some template tags to simplify the reCaptcha adoption:
 

snowpenguin/django/recaptcha2/widgets.py

@@ -7,9 +7,10 @@
 
 
 class ReCaptchaWidget(Widget):
-    def __init__(self, explicit=False, theme=None, type=None, size=None, tabindex=None, callback=None,
-                 expired_callback=None, public_key=None, attrs={}, *args, **kwargs):
+    def __init__(self, explicit=False, container_id=None, theme=None, type=None, size=None, tabindex=None,
+                 callback=None, expired_callback=None, public_key=None, attrs={}, *args, **kwargs):
         super(ReCaptchaWidget, self).__init__(*args, **kwargs)
+        self.container_id = container_id
         self.explicit = explicit
         self.theme = theme
         self.type = type
@@ -24,8 +25,11 @@ def render(self, name, value, attrs=None, *args, **kwargs):
         template = 'snowpenguin/recaptcha/'
         template += 'recaptcha_explicit.html' if self.explicit else 'recaptcha_automatic.html'
 
-        # this avoids name collisions when you use multiple recaptcha in the same page with the same field name
-        container_id = 'recaptcha-%s-%s' % (name, randint(10000, 99999)) if self.explicit else 'recaptcha-%s' % name
+        if self.container_id:
+            container_id = self.container_id
+        else:
+            # this avoids name collisions when you use multiple recaptcha in the same page with the same field name
+            container_id = 'recaptcha-%s-%s' % (name, randint(10000, 99999)) if self.explicit else 'recaptcha-%s' % name
 
         return mark_safe(
             render_to_string(template, {