RE: How Django inlineformsets works internally

[Matthew Pava]

You might want to look at stuff that has already been developed.  (No need to reinvent the wheel, right?)

Check out this jQuery plugin for making a dynamic formset:

https://github.com/elo80ka/django-dynamic-formset

 

You might find some answers there.

 

From: django-d...@googlegroups.com [mailto:django-d...@googlegroups.com] On Behalf Of sevenr...@gmail.com
Sent: Friday, October 13, 2017 7:59 AM
To: Django developers (Contributions to Django itself)
Subject: How Django inlineformsets works internally

 

Hello,

First I know, this is for django developers, but I asked on django-users, stackoverflow, udemy etc and I never got an answered, so this is my last options, to ask the developers.

I checked the Django code for BaseFormset, modelform_factory,modelformset_factory,formset_factory etc but not everything is clear for me.

-----------------

I have a form with two inline formsets.
.

At the HTML level Django use the hidden fields for the formset management, and use the prefix to know which fields are related to a formset.

Also it has ids in the html id, to group like in a virtual form the fields.

 

<input name="documents-0-document" id="id_documents-0-document" type="file"> 
<input name="documents-0-filename" class="vTextField" maxlength="255" id="id_documents-0-filename" type="text"> 
<input name="documents-0-DELETE" id="id_documents-0-DELETE" type="checkbox">

On retrieve by default I get the path to the file in a paragraph and the inputs (html elements) are empty.

 <p class="file-upload">Currently:
<a href="/media/Test%20Insieme/documents/sdsasa7">Test Insieme/documents/sdsasa7</a><br>
<input name="documents-0-document" id="id_documents-0-document" type="file">
Change:
</p>

On Browse(upload a different file) Django knows to update the same record in the database. Similar for click on checkbox.

 

How Django make the correlation between the paragraph that show the path, the html id of the element and what is in the database?

 

I want to change the UI (make it dynamic with JavaScript, use button instead of checkbox for delete) and I want to understand how the mechanism is working because I need to do two very customize formsets.

 

Thank you!

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