我的组合框countries（def trip_selector）依赖于组合框trips（def trips）。在组合框中，我正确地显示了项目。如果我点击按钮，我想打印textarea（def result）中的所选项目。x1c 0d1x的数据
问题是我无法提取trips组合框中的所选项目，我得到错误：None。我使用selected = request.GET.get('trips')也是因为trips是trips.html页面中select name="trips" id="id_trip"的名称。要打印的选定项目不发送数据，只显示数据。我不知道为什么它不工作。你能帮帮我吗？

注意事项：我指定一个重要的事情，如果你想帮助我：我不想把selected = request.GET.get（'trips'）移动到def test1（）函数或def result（）函数中，如果需要的话，最多创建另一个函数。def test1只是我将要创建的许多函数中的一个，所以将selected = request.GET.get（'trips'）移动到每个函数test1、test 2、test 3、test 4等中是没有意义的。这些函数将显示在textarea（def result）中，该区域必须仅保留为查看器，因为它将显示各种函数（而不仅仅是一个）。
views.py

from django.shortcuts import render
from .models 
import Trip import random

def trip_selector(request): 
    countries = Trip.objects.values_list('country', flat=True).distinct() 
    trips = []  # no trips to start with 
    return render(request, 'form.html', {"countries": countries, "trips": trips})

def trips(request): 
    country = request.GET.get('country') 
    trips = Trip.objects.filter(country=country)

    #selected item
    global selected 
    selected = request.GET.get('trips') #Don't move in test1() or result() §
    return render(request, 'trips.html', {"trips": trips, "selected": selected})

def test1():
    sentence = ["The selected trip is ", "Congratulations you have selected the trip ", "You have currently selected travel ", "The currently selected trip is "] 
    random_sentence = random.choice(sentence) final_sentence = random_sentence + selected return final_sentence

def result(request):
    test_print_in_result = test1()
    return render(request,"result.html", {"test_print_in_result": 
test_print_in_result})

字符串

form.py

{% extends 'base.html' %} 

{% block content %}
<!-- First Combobox -->

<label for="id_country">Country</label>
<select name="country" id="id_country" hx-get="{% url 'trips' %}" hx-swap="outerHTML" hx-target="#id_trip" hx-indicator=".htmx-indicator" hx-trigger="change">
 <option value="">Please select a country</option>

{% for country in countries %}
 <option value="{{ country }}">{{ country }}</option>
  {% endfor %}
</select>

<!-- Second Combobox ??????? (non lo so)-->

<label for="id_trip">Trip</label> {% include "trips.html" %}
<!-- Textarea-->
{% include "result.html" %}
<!-- Button-->

<button type="button" class="mybtn" name="btn" hx-get="{% url 'result' %}" hx-swap="outerHTML" hx-target="#id_result" hx-indicator=".htmx-indicator">Button 1</button>
{% endblock %}

型

trips.html

<!-- Second Combobox -->
<select name="trips" id="id_trip" style="width:200px;">
 <option value="">Please select</option>
    {% for trip in trips %}
 <option value="{{ trip.id }}">{{ trip.departure }}-{{ trip.destination }}</option>
    {% endfor %}
 </select>

型

result.html

<textarea name="result" id="id_result">{{ test_print_in_result }}</textarea>

型
我希望有人能帮助我。谢谢大家！