Allow arbitrary ErrorList class in BaseForm._html_output

[michal@…]

I realised there is no intent to support "clean" webdesign approach with as_div() shortcuts in BaseForm class as per ticket 3286. Too sad I must say...

Anyway I inherited BaseForm to my own Form implementation that produces clean CSS-able <div></div> output, where the only problem remains with error messages being <ul>-list. Attached is a patch that enables passing my own ErrorList implementation with <div/> support to _html_output() and wraps it all up to a completely <div/>-ed Form. Second attachment is shows my DivForm class and accompanying DivErrorList class.

[michal@…]

Patch that adds a parameter to _html_output to allow using arbitrary ErrorList class implementation

[michal@…]

Sample DivForm class implementation with as_div() shortcut method.

[Malcolm Tredinnick]

I've been thinking that we might need something like this for a while, too. The first patch is almost exactly what I had in mind, although we'll probably use a shorter parameter name in the final commit. Needs a test (in regressiontests/forms/tests.py) and documentation (docs/newforms.txt) to be complete.

Not sure what the second patch is for. You might want to put that in the wiki as an example after the first patch is commited?

[michal@…]

Patch that adds a parameter to BaseForm.init constructor to allow using arbitrary ErrorList class implementation

[michal@…]

In the previous comment is attached an improved patch that converts all other ErrorList usages. Works fine with NON_FIELD_ERRORS as well now.

[Chris Beaven]

simpler version with tests and first-pass docs

[Malcolm Tredinnick]

(In [6142]) Fixed #4752 -- Make default ErrorList customisable in newforms display. Based on a patch from michal@… and SmileyChris.