Source

djangotoolbox / djangotoolbox / widgets.py

from django.forms import widgets
from django.template.defaultfilters import filesizeformat
from django.utils.safestring import mark_safe

class BlobWidget(widgets.FileInput):
    def render(self, name, value, attrs=None):
        try:
            blob_size = len(value)
        except:
            blob_size = 0

        blob_size = filesizeformat(blob_size)
        original = super(BlobWidget, self).render(name, value, attrs=None)
        return mark_safe('%s<p>Current size: %s</p>' % (original, blob_size))
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