Re: SVG widget for the Admin

Hi Mike

OK, if you have more specific feedback I will try to respond.

I doubt you need a specific template as the SVG should be displayable by a modern browser using Django's built-in options.

On Thursday, 3 June 2021 at 01:10:07 UTC+2 Mike Dewhirst wrote:

Derek

I pretty much tried what you suggested. I dont have access to my machine atm so that's all I can really say. 

I looked at the link and understand the list customisation because I already use it elsewhere. 

It does look like I'll have to switch in my own template so I can include a safe filter.

Thanks again

Mike

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-------- Original message --------

From: Derek <game...@gmail.com>

Date: 2/6/21 23:39 (GMT+10:00)

To: Django users <django...@googlegroups.com>

Subject: Re: SVG widget for the Admin

When you say "I tried your suggestion and had no success." what exactly did you try  - i.e. what code did you use and what errors did you get?

WRT "Not sure where this should live for the Admin to call it and display the image." - it lives exactly as I showed it in my example; its a user-defined property for the model in which the SVG text is stored.  You can use it in the admin as you would the normal model fields. 

There is a good example of defining and using your own derived 'field'  here:
https://realpython.com/customize-django-admin-python/#modifying-a-change-list-using-list_display

(Please note that to show HTML strings, you need to use the format_html() method. Ignore mt previous reference to "allow_tags" as this is deprecated.)

Derek

On Wednesday, 2 June 2021 at 10:05:11 UTC+2 Mike Dewhirst wrote:

On 1/06/2021 11:44 pm, Derek wrote:
> You haven't defined where in the admin interface you want this image
> to be displayed?  A table?
>
> I have not tried this, but could you not create an additional field on
> your model that returns the HTML-encoding needed to display the SVG?

Derek, thanks for responding. I tried your suggestion and had no success.

Where in the admin? Just among a normal roster of fields. The svg is a
molecular structure and the image needs to appear for example just after
the molecular formula. I collect the actual svg code via a public API on
saving the record.

>
> E.g.
>
> class MyModel():
>     svg_text = CharField()

in my case it is ...

class chemical(models.Model):
    ...
    ddstructure = models.TextField(
        null=True,
        blank=True,
        verbose_name="2D structure",
    )

>
>     def _the_svg(self):
>         return """<svg width="100" height="100">%s</svg>""" %
> self.svg_text
>         _the_svg.allow_tags = True

Not sure where this should live for the Admin to call it and display the
image.


> I am not sure about editing visually, however - I would expect that
> would require a specialised widget.

It is read-only in all cases.

I was thinking a widget might be needed just for display. The svg code
arrives complete with tags so really all it needs is a mechanism to
persuade the admin it is safe to render as is.

I haven't seen such a (probably insecure) "feature" previously. I've
looked through the docs but haven't found it yet.

Thanks again

Mike


>
> HTH
> Derek
>
>
> On Tuesday, 1 June 2021 at 03:28:59 UTC+2 Mike Dewhirst wrote:
>
> I collect the svg source for an image from a public API and store
> it in
> a models.TextField. I have no difficulty displaying it in a normal
> view
> and my own template. Nothing special, it just emerges. I don't
> even need
> a 'safe' filter.
>
> However, I really want to display such images in the Admin. At this
> stage all it displays is the svg source.
>
> What is the correct way to make the image appear in the Admin?
>
> Do I need a special field inheriting from TextField? Do I need a
> special
> widget? Is there a way to mark admin field values as safe?
>
> Thanks for any hints
>
> Mike
>
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