Add link to open URL from URLField

[Chris Wilson]

It's useful for URLField to give you a way to open the URL; otherwise you might as well use a CharField.

class URLFieldWidgetWithLink(AdminURLFieldWidget):
    def render(self, name, value, attrs=None):
        html = AdminURLFieldWidget.render(self, name, value, attrs=attrs)

        if value is not None:
            final_attrs = dict(href=value, target='_blank')
            html += " <a %s>(open)</a>" % attributes_to_str(final_attrs)
        
        from django.utils.safestring import mark_safe
        return mark_safe(html)

class DocumentAdmin(admin.ModelAdmin):
    formfield_overrides = {
        django_fields.URLField: {'widget': URLFieldWidgetWithLink},
    }

[Aymeric Augustin]

I suppose the code in the ticket description is the patch; a unified diff would be much easier to apply...

[Ulrich Petri]

I've turned the ad-hoc code in the description into a proper patch for AdminURLFieldWidget and added tests as well as a short mention of this new feature in the docs.

Code at: ​https://github.com/django/django/pull/190

[Tomáš Ehrlich]

Fixed force_unicode in AdminURLFieldWidget

[Tomáš Ehrlich]

Pull request has broken tests with latest checkout of Django:

NameError: global name 'force_unicode' is not defined

in django/contrib/admin/widgets.py.

I've just renamed force_unicode to force_text and tests passed.

[Florian Apolloner <florian@…>]

In ac2052ebc84c45709ab5f0f25e685bf656ce79bc:

Fixed #17549 -- Added a clickable link for URLFields in admin change list.

[Florian Apolloner <florian@…>]

In f12fa7750c95cafa3a317be6a62ed3a2f53caf3c:

[1.5.X] Fixed #17549 -- Added a clickable link for URLFields in admin change list.

Backport of ac2052ebc84c45709ab5f0f25e685bf656ce79bc from master.