django admin show field only if checkbox is false

Question

models.py

class Menu(models.Model):

    ...
    has_submenu=models.BooleanField(default=1)
    page=models.ForeignKey(Page,null=True)

I wa

Answer 1

You could extend Django admin template.

Just follow this structure:

Across an entire project:

templates/admin/change_form.html

Across an application

templates/admin/<my_app>/change_form.html

Across a Model

templates/admin/<my_app>/<my_model>/change_form.html

In your case, looks like you only need to extend the Menu model. I would do the following:

1. grab the change_form.html teamplate from django folder
2. inside the object loop, look for the page field
3. do the condition check on has_submenu to decide whether to show or not the page attribute

Answer 2

You can use jQuery within the Django admin:

class MenuAdmin(admin.ModelAdmin):
    # ...
    class Media:
        js = ('/static/admin/js/hide_attribute.js',)

ModelAdmin and InlineModelAdmin have a media property that returns a list of Media objects which store paths to the JavaScript files for the forms and/or formsets.

Contents of hide_attribute.js:

hide_page=false;
django.jQuery(document).ready(function(){
    if (django.jQuery('#id_has_submenu').is(':checked')) {
        django.jQuery(".page").hide();
        hide_page=true;
    } else {
        django.jQuery(".page").show();
        hide_page=false;
    }
    django.jQuery("#id_has_submenu").click(function(){
        hide_page=!hide_page;
        if (hide_page) {
            django.jQuery(".page").hide();
        } else {
            django.jQuery(".page").show();
        }
    })
})

Namespacing:

To avoid conflicts with user-supplied scripts or libraries, Django’s jQuery (version 3.3.1) is namespaced as django.jQuery.

Answer 3

How about overriding get_form method on a ModelAdmin, like this:

class MenuModelAdmin(admin.ModelAdmin):
    def get_form(self, request, obj=None, **kwargs):
        self.exclude = []
        if obj and obj.has_submenu:
            self.exclude.append('page')
        return super(MenuModelAdmin, self).get_form(request, obj, **kwargs)

Also, please, see get_form docs.