Do not use this solution. The Svg_AdminTextareaWidget code below deletes data on saving.
I think the reason might be that on saving it tries to save the image instead of the image source code.
I'm now digging deeper and will report back. Mike On 7/06/2021 6:00 pm, Mike Dewhirst wrote:
Thanks Derek - it is now working as follows ... class Chemical(models.Model): ...ddstructure = models.TextField(null=True, blank=True, verbose_name="2D structure")... class Svg_AdminTextareaWidget(AdminTextareaWidget): def render(self, name, value, attrs=None, renderer=None): if value: return force_text(self.format_value(value)) class ChemicalAdmin(admin.ModelAdmin): ... def formfield_for_dbfield(self, db_field, request, **kwargs): if db_field.name == 'ddstructure': kwargs['widget'] = Svg_AdminTextareaWidget return super().formfield_for_dbfield(db_field, request, **kwargs) ... Cheers Mike On 7/06/2021 11:50 am, Mike Dewhirst wrote:On 6/06/2021 6:14 pm, Derek wrote:RE - "I've looked at the AdminTextareaWidget which is probably based on the TextInput built-in widget but see no way to influence what it does. " and "How do I get it to display inline in the proper place?"There seems to be similar question on SO:https://stackoverflow.com/questions/6239966/add-custom-html-between-two-model-fields-in-django-admins-change-form <https://stackoverflow.com/questions/6239966/add-custom-html-between-two-model-fields-in-django-admins-change-form>The answer with AdminFooWidget() and FooAdminForm() seems closest to your use case.Thanks for that. Unfortunately the answer at that link is ten years old and I think Django Admin must have moved on since then. I'm still trying to debug an inexplicable KeyError but I think I understand the approach.I'll keep trying Cheers mikeOn Sun, 6 Jun 2021 at 09:56, Mike Dewhirst <mi...@dewhirst.com.au <mailto:mi...@dewhirst.com.au>> wrote:On 4/06/2021 5:15 pm, Derek wrote:Hi Mike The SVG is not going to display as SVG in a *form* - for that you'd need a widget, or perhaps just let users edit the text.OK - I'm outta my depth here. I've looked at the AdminTextareaWidget which is probably based on the TextInput built-in widget but see no way to influence what it does. In theory I'd create a new widget inheriting from that and use mark_safe() somehow. Then I would need to tell the admin form to use it for my ddstructure field. BUT see my template effort belowDid you try displaying in the normal admin lists? This was my understanding of where you wanted to see it and the code snippets I posted were for that purpose. If you want to see it as "read only" in the form, but shown as SVG, perhaps you need a custom model template (https://docs.djangoproject.com/en/dev/ref/contrib/admin/#templates-which-may-be-overridden-per-app-or-model <https://docs.djangoproject.com/en/dev/ref/contrib/admin/#templates-which-may-be-overridden-per-app-or-model>)Again, my feet don't touch bottom. I tried adding some code to change_form.html like this ... {% extends "admin/change_form.html" %} {% block content %}{{ block.super }} {% if original.ddstructure %} {{ original.ddstructure | safe }} {% else %} <p>No 2D structure image </p> {% endif %} {% endblock %} This kinda worked. It comes after block.super so it displays the svg image correctly but at the bottom of the page. AND the raw (or safe) code also displays in the location where I really want the image. So close but ... How do I get it to display inline in the proper place? Many thanks for hanging in there Cheers MikeDerek On Thursday, 3 June 2021 at 08:22:57 UTC+2 Mike Dewhirst wrote: On 3/06/2021 4:00 pm, Derek wrote: > > > > 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", > ) > The above is unchanged. # admin class ChemicalAdmin(admin.ModelAdmin): def _ddstructure(self, obj): return mark_safe(obj.ddstructure) ... fieldsets = ( ( None, { "fields": ( "ddstructure", # displays svg code "_ddstructure", ... } ), FYI it works perfectly as a column in the list display - but I don't need it there, rather in the page for the chemical. This is what happens if it is included in the fieldsets "fields" roster. FieldError at /admin/chemical/chemical/17/change/ Unknown field(s) (_ddstructure) specified for Chemical. Check fields/fieldsets/exclude attributes of class ChemicalAdmin. Request Method: GET Request URL: http://localhost:8088/admin/chemical/chemical/17/change/ <http://localhost:8088/admin/chemical/chemical/17/change/> Django Version: 3.2.3 Exception Type: FieldError Exception Value: Unknown field(s) (_ddstructure) specified for Chemical. Check fields/fieldsets/exclude attributes of class ChemicalAdmin. Exception Location: D:\Users\mike\envs\xxai\lib\site-packages\django\contrib\admin\options.py, line 712, in get_form Python Executable: D:\Users\mike\envs\xxai\Scripts\python.exe Python Version: 3.8.3 Cheers Mike > > > > def _the_svg(self): > > return """<svg width="100" height="100">%s</svg>""" % > > self.svg_text > > _the_svg.allow_tags = True >-- Signed email is an absolute defence against phishing. Thisemail has been signed with my private key. If you import my public key you can automatically decrypt my signature and be sure it came from me. Just ask and I'll send it to you. 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If you import my public key you can automatically decrypt my signature and be sure it came from me. Just ask and I'll send it to you. Your email software can handle signing.-- Signed email is an absolute defence against phishing. This email has been signed with my private key. If you import my public key you can automatically decrypt my signature and be sure it came from me. Just ask and I'll send it to you. Your email software can handle signing.
-- Signed email is an absolute defence against phishing. This email has been signed with my private key. If you import my public key you can automatically decrypt my signature and be sure it came from me. Just ask and I'll send it to you. Your email software can handle signing. -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/775b0f5c-48a4-112d-b546-f08509eba03b%40dewhirst.com.au.
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