$ python manage.py startapp carousel# settings.py```INSTALLED_APPS = [  ...  'carousel',]```# carousel/models.py```from django.db import models class Carousel(models.Model):  community = models.IntegerField('小区ID')    class Meta:    verbose_name = verbose_name_plural = '轮播设置'```

mkdir -p carousel/templatetagstouch carousel/templatetags/__init__.pytouch carousel/templatetags/search_with_placeholder.py

# carousel/templatetags/search_with_placeholder.pyfrom django.contrib.admin.templatetags.admin_list import (  InclusionAdminNode,  register,  search_form,)  def search_form_plus(cl, search_placeholder: str = ""):  """  Display a search form for searching the list with placeholder.  """  return dict(search_form(cl), search_placeholder=search_placeholder)  @register.tag(name="search_form_plus")def search_form_tag(parser, token):  return InclusionAdminNode(    parser,    token,    func=search_form_plus,    template_name="search_form_plus.html",    takes_context=False,  )

mkdir -p carousel/templates/adminmkdir -p carousel/templates/custom_admintouch carousel/templates/admin/search_form_plus.htmltouch carousel/templates/custom_admin/change_list.html

<!-- carousel/templates/admin/search_form_plus.html -->{% load i18n static %}{% if cl.search_fields %}<div id="toolbar"><form id="changelist-search" method="get"><div><!-- DIV needed for valid HTML --><label for="searchbar"><img src="{% static "admin/img/search.svg" %}" size="40" name="{{ search_var }}" placeholder="{{ search_placeholder }}" value="{{ cl.query }}" id="searchbar" autofocus><input type="submit" value="{% translate 'Search' %}">{% if show_result_count %}  <span class="small quiet">{% blocktranslate count counter=cl.result_count %}{{ counter }} result{% plural %}{{ counter }} results{% endblocktranslate %} (<a href="?{% if cl.is_popup %}_popup=1{% endif %}" rel="external nofollow" >{% if cl.show_full_result_count %}{% blocktranslate with full_result_count=cl.full_result_count %}{{ full_result_count }} total{% endblocktranslate %}{% else %}{% translate "Show all" %}{% endif %}</a>)</span>{% endif %}{% for pair in cl.params.items %}  {% if pair.0 != search_var %}<input type="hidden" name="{{ pair.0 }}" value="{{ pair.1 }}">{% endif %}{% endfor %}</div></form></div>{% endif %}

<!-- carousel/templates/custom_admin/change_list.html -->{% extends "admin/change_list.html" %}{% load search_with_placeholder %} {% block search %}{% search_form_plus cl search_placeholder %}{% endblock %}

# Django3.1from django.contrib import admin from .models import BoxCarousel, Carousel,  class PlaceholderMixin:  change_list_template = "custom_admin/change_list.html"   def changelist_view(self, request, extra_context=None):    search_placeholder = getattr(self, "search_placeholder", False)    if search_placeholder:      extra_context = extra_context or {}      extra_context["search_placeholder"] = search_placeholder    return super().changelist_view(request, extra_context)  @admin.register(Carousel)class CarouselAdmin(PlaceholderMixin, admin.ModelAdmin):  search_fields = ["=community"]  search_placeholder = "请输入小区ID"