If I would like to override the KeywordsWidget (the TextInput) how could I
do that? I want to add a custom validator to it. Thanks
class KeywordsWidget(forms.MultiWidget):
"""
Form field for the ``KeywordsField`` generic relation field. Since
the admin with model forms has no form field for generic
relations, this form field provides a single field for managing
the keywords. It contains two actual widgets, a text input for
entering keywords, and a hidden input that stores the ID of each
``Keyword`` instance.
The attached JavaScript adds behaviour so that when the form is
submitted, an AJAX post is made that passes the list of keywords
in the text input, and returns a list of keyword IDs which are
then entered into the hidden input before the form submits. The
list of IDs in the hidden input is what is used when retrieving
an actual value from the field for the form.
"""
class Media:
js = (static("mezzanine/js/admin/keywords_field.js"),)
def __init__(self, attrs=None):
"""
Setup the text and hidden form field widgets.
"""
widgets = (forms.HiddenInput,
forms.TextInput(attrs={"class": "vTextField"}))
super(KeywordsWidget, self).__init__(widgets, attrs)
self._ids = []
def decompress(self, value):
"""
Takes the sequence of ``AssignedKeyword`` instances and splits
them into lists of keyword IDs and titles each mapping to one
of the form field widgets.
"""
if hasattr(value, "select_related"):
keywords = [a.keyword for a in value.select_related("keyword")]
if keywords:
keywords = [(str(k.id), k.title) for k in keywords]
self._ids, words = list(zip(*keywords))
return (",".join(self._ids), ", ".join(words))
return ("", "")
def format_output(self, rendered_widgets):
"""
Wraps the output HTML with a list of all available ``Keyword``
instances that can be clicked on to toggle a keyword.
"""
rendered = super(KeywordsWidget, self).format_output(rendered_widgets)
links = ""
for keyword in Keyword.objects.all().order_by("title"):
prefix = "+" if str(keyword.id) not in self._ids else "-"
links += ("<a href='#'>%s%s</a>" % (prefix, str(keyword)))
rendered += mark_safe("<p class='keywords-field'>%s</p>" % links)
return rendered
def value_from_datadict(self, data, files, name):
"""
Return the comma separated list of keyword IDs for use in
``KeywordsField.save_form_data()``.
"""
return data.get("%s_0" % name, "")
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