Workaround to applegrew/django-select2#32

gistfile1.py

# WARNING: This is just a workaround.  Consider it as a very
#          temporary solution if you really need this feature.

from django.utils.safestring import mark_safe
from django_select2.util import convert_to_js_arr


TEMPORARY_ID = 0


def selector():
    return """
    $input = $('.select2-%s').nextAll('input:not([id*="__prefix__"])');
    """ % TEMPORARY_ID


def render_js_script(inner_code):
    code = """
    %s
    if ($input.length != 0) {
        %s
    }""" % (selector(), inner_code)
    return u"""
        <script type="text/javascript">
            jQuery(function ($) {
                %s else {
                    $('.add-row a').click(function () {
                        %s
                    })
                }
            });
        </script>""" % (code, code)


class FixedSelect2WidgetMixin(object):
    def render_js_code(self, id_, *args):
        if id_:
            return render_js_script(self.render_inner_js_code(id_, *args))
        return u''

    def render(self, name, value, attrs=None, choices=()):
        global TEMPORARY_ID

        s = """
        <span class="select2-%s"></span>
        <script>
            jQuery(function ($) {
                %s
            });
        </script>
        """ % (TEMPORARY_ID, selector())

        s += super(FixedSelect2WidgetMixin, self).render(
            name, value, attrs=attrs, choices=choices)

        id_ = attrs.get('id', None)

        s = s.replace("$('#%s')" % id_, '$input')
        s = s.replace('$("#%s")' % id_, '$input')
        s = s.replace("'%s'" % id_, '$input[0].id')

        TEMPORARY_ID += 1
        return mark_safe(s)


# Now, redefine each widget class you need by adding the mixin
# as the first inherited class.

from django_select2 import AutoHeavySelect2Widget, AutoHeavySelect2MultipleWidget


class AutoHeavySelect2Widget(FixedSelect2WidgetMixin, AutoHeavySelect2Widget):
    pass


class AutoHeavySelect2MultipleWidget(FixedSelect2WidgetMixin, AutoHeavySelect2MultipleWidget):
    def render_inner_js_code(self, id_, name, value, *args):
        js = ''
        if value:
            js += u"$('#%s').val(django_select2.convertArrToStr(%s));" \
                  % (id_, convert_to_js_arr(value, id_))
        js += u"django_select2.initMultipleHidden($('#%s'));" % id_
        js += super(AutocompleteMultiple, self).render_inner_js_code(
            id_, name, value, *args)
        return js

https://gist.github.com/andergmartins/9452777#comment-1195360