django-cascading-dropdown-widget

Provide a cascading-dropdown widget for django.

Install

pip install django-cascading-dropdown-widget

Usage

pro/settings.py

Note:

• The application used template of django_cascading_dropdown_widget, so MUST include django_cascading_dropdown_widget in INSTALLED_APPS.

INSTALLED_APPS = [
    ...
    'django_cascading_dropdown_widget',
    ...
]

app/admin.py

Note:

• Create a new ModelForm, and setting field widget to DjangoCascadingDropdownWidget.
• Create a choices generator instance.

from django.contrib import admin
from django_cascading_dropdown_widget.widgets import DjangoCascadingDropdownWidget
from django_cascading_dropdown_widget.widgets import CascadingModelchoices
from django import forms
from .models import Category
from .models import Book
from .models import Character

class CharacterForm(forms.ModelForm):
    class Meta:
        model = Category
        exclude = []
        widgets = {
            "book": DjangoCascadingDropdownWidget(choices=CascadingModelchoices({
                "model": Category,
                "related_name": "books",
            },{
                "model": Book,
                "fk_name": "category",
            })),
        }

class CharacterAdmin(admin.ModelAdmin):
    form = CharacterForm
    list_display = ["name", "book"]

Choices generator

CascadingModelchoices

class CascadingModelchoices(object):

    def __init__(self, *cascadings):
        ...

The parameters for CascadingModelchoices generator are the CASCADING-MODEL-SETTINGS(name it cascadings for short). A MODEL-SETTING(name it cascading for short)'s config items are:

• model, required. The Model class.
• related_name, required but except for the last model-setting. Use the related_name to get the queryset of the next level items.
• fk_name, required but except for the first model-setting. Which field name to get parent model.
• empty, optional. Use empty string instread of '----- xxx ----' in select for empty value.
• str, optional. Get item title from str method or property instread of get title by str(item).

SimpleChoices

SimpleChoices2 (alias)

class SimpleChoices(object):

    def __init__(self, *cascadings, empty1="-"*10, empty2="-"*10):
        ...

• A cascading is a tuple of (Title1, List).
• The Title1 is the first level option.
• The List is the second level selector. The List item is a tuple of (Value2, Title2).
• The Value2 is the second level option's value.
• The Title2 is the second level option's title.

MPTTModel Choices

• Use CascadingModelchoices for the generator.

• Create indented_title function for the MPTTModel. You use whatever name for the indented_title.

  class MyModel(MPTTModel):
      def indented_title(self):
          return ("-"*4) * self.get_level() + self.name
  

• Setting "str": "indented_title" in cascading.

• The application django-cascading-dropdown-widget is NOT required django-mptt, so install django-mptt by youself. We have did try...except... with django-mptt's missing.

Releases

v0.2.7 2023/09/14

• Doc update.

v0.2.6 2021/04/08

• Fix problems that sometimes the init change event is not triggered.

v0.2.5 2020/12/01

• Remove arrive.js deps.
• Use django's jquery.
• Fix change event first trigger problem. We should ignore the first trigger.

v0.2.2 2020/03/27

• Use $(document).on("change", ".django-cascading-dropdown-widget-select", function(){...}) instead of arrive monitor. So now we do NOT depends on django-static-arrive.

v0.2.1 2020/03/25

• Use django-static-arrive js file.
• Fire change event on the hidden input.

v0.2.0 2020/03/23

• Add SimpleChoices generator.
• Add white-space: nowrap; for django-cascading-dropdown-widget.

v0.1.0 2020/03/16

• Fisrt release.