Embed PDF In Dexterity File View - plone

Question

I want a quick and easy (plugin dependent) PDF embedded view, not just a download link for File items.
My custom File schema looks like:
class IBulletin(form.Schema):
...
form.primary('file')
file = NamedBlobFile(
title=_(u"File"),
required=False,
)
class Bulletin(Item):
grok.implements(IBulletin, IFile)
I follow instruction at http://www.kcsts.co.uk/blog/embedded-pdf-in-file-view-with-plone and it works for Archetypes File view, but seems not working for Dexterity File view.
I guess the critical part is within <object ...> and <embed ...>. My trial to the template looks as follows:
<metal:content-core define-macro="content-core"
tal:define="content_type context/file/contentType|nothing;
location string:${context/absolute_url}/##download/file/${context/file/filename};
v python:context.restrictedTraverse('contenttype_utils');">
<object class="viewembededfile" type="application/pdf" data=""
tal:condition="python:content_type.endswith('pdf')"
tal:attributes="data location; width string:100%; height string:900">
Please click here to download the PDF.
<embed src="" class="viewembededfile" type="application/pdf"
tal:attributes="src location">
</embed>
</object>
...
I also tried <object ... attributes="data context/absoulte_url;" and <embed ... attributes="src context/absolute_url" but does not work. It shows only a block with gray background. See the image for reference.
Any advice?

Answer 1

I faced the same problem and after some trial and error, I found out that if I don't include the file name at the end of the location of the pdf file then at least Firefox starts to show the embedded pdf.
<object type="application/pdf"
tal:attributes="data string:${context/absolute_url}/##download/file">
</object>
Same applies for links to the pdf file, with file name a download dialog is shown, and without the pdf file is rendered inside Firefox.