Django中RadioSelect无法获取用户选择，cleaned_data无输出求助

问题根源 #

手动编写的HTML单选按钮未设置value属性，浏览器默认提交值为"on"，但Django表单预设选项值为"0"和"1"，因此表单验证失败，cleaned_data无法获取有效数据。同时视图逻辑未区分GET/POST请求，初始加载时表单绑定空POST数据，引发不必要的错误。

解决方案 #

1. 修复HTML模板的单选按钮 #

给每个radio input添加value属性，对应forms.py中定义的选项值，同时修正label的for属性关联正确的input id：

{% extends 'generator/base.html'%}
{% block content %}
<style>
    .button {
      background-color: #4CAF50;
      border: none;
      color: white;
      padding: 15px 32px;
      text-align: center;
      text-decoration: none;
      display: inline-block;
      font-size: 16px;
      margin: 4px 2px;
      cursor: pointer;
    }
</style>
<form method = "POST">
    {% csrf_token %}
    <div class="form-check">
        <input class="form-check-input" type="radio" name="password" id="Level0" value="0">
        <label class="form-check-label" for="Level0">Level 0</label>
    </div>
    <div class="form-check">
            <input class="form-check-input" type="radio" name="password" id="Level1" value="1">
        <label class="form-check-label" for="Level1">Level 1</label>
    </div>
        <button type="submit" class="button">Submit</button>
</form>
<h5 class="alert alert-success">Your Generated Password: <strong>{{password}}</strong></h5> 
{% endblock %}

2. 优化views.py的请求逻辑 #

仅在POST请求时处理表单数据，GET请求初始化空表单：

from django.shortcuts import render
import random
import string
from random_word import RandomWords
from .forms import CHOICES

def password(request):
    passw = passGenAdvanced()
    form = CHOICES()
    if request.method == 'POST':
        form = CHOICES(request.POST)
        if form.is_valid():
            selected = form.cleaned_data.get("password")
            print(selected)
            # 可根据selected值生成对应强度的密码
            # 示例：if selected == '0': passw = generate_level0_password()

    return render(request, 'generator/password.html', {"password": passw, "form": form})

3. 推荐：使用Django表单自动渲染模板（简洁不易错） #

无需手动编写HTML表单，直接在模板中渲染表单字段，Django会自动生成正确的radio按钮和属性：

{% extends 'generator/base.html'%}
{% block content %}
<style>
    .button {
      background-color: #4CAF50;
      border: none;
      color: white;
      padding: 15px 32px;
      text-align: center;
      text-decoration: none;
      display: inline-block;
      font-size: 16px;
      margin: 4px 2px;
      cursor: pointer;
    }
    .form-check {
        margin: 10px 0;
    }
</style>
<form method = "POST">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit" class="button">Submit</button>
</form>
<h5 class="alert alert-success">Your Generated Password: <strong>{{password}}</strong></h5> 
{% endblock %}

内容的提问来源于stack exchange，提问作者James Bond