Django 自定义模板中集成表单字段、帮助文本和错误信息

# forms.py
from django import forms
from django.contrib.auth.forms import UserCreationForm
from .models import CustomUser

class CustomUserCreationForm(UserCreationForm):
    # 在这里可以为字段添加 help_text 或在模型中定义
    email = forms.EmailField(help_text="请输入有效的电子邮件地址。", required=True)
    first_name = forms.CharField(max_length=30, help_text="您的名字。", required=True)
    last_name = forms.CharField(max_length=30, help_text="您的姓氏。", required=True)
    idade = forms.IntegerField(help_text="您的年龄。", required=True)
    telefone = forms.CharField(max_length=20, help_text="您的联系电话。", required=True)

    class Meta:
        model = CustomUser
        fields = ('username', 'email', 'first_name', 'last_name', 'idade', 'telefone')

    # 如果需要，可以在这里添加额外的验证或 help_text
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # 也可以在 __init__ 方法中动态设置 help_text
        self.fields['username'].help_text = "用于登录的用户名或电子邮件。"
        self.fields['password1'].help_text = "密码必须包含至少8个字符，包括大小写字母、数字和特殊符号。"
        self.fields['password2'].help_text = "请再次输入您的密码以确认。"

{% extends "base.html" %}
{% load static %}
{% block title %}注册{% endblock %}

{% block content %}
<link rel="stylesheet" href="{% static 'css/inputs.css' %}">
<link rel="stylesheet" href="{% static 'css/signup.css' %}">
<div class="signup">
  <a href="{% url 'login' %}"><- 返回</a>
  <h1>注册</h1>
  <form action="" method="post">
    {% csrf_token %}

    {# 显示非字段错误（如表单整体验证失败的错误） #}
    {% if form.non_field_errors %}
        <div class="alert alert-danger">
            {% for error in form.non_field_errors %}
                <p>{{ error }}</p>
            {% endfor %}
        </div>
    {% endif %}

    {% for field in form %}
        <div class="group {% if field.name == 'password1' %}password1{% elif field.name == 'password2' %}password2{% endif %}">
            {# 渲染字段的 HTML widget (如 <input type="text">) #}
            {{ field }}
            <span class="highlight"></span>
            <span class="bar"></span>
            {# 渲染字段的标签 #}
            <label>{{ field.label }}</label>

            {# 显示字段特定的错误信息 #}
            {% if field.errors %}
                <ul class="errorlist">
                    {% for error in field.errors %}
                        <li>{{ error }}</li>
                    {% endfor %}
                </ul>
            {% endif %}

            {# 显示字段的帮助文本 #}
            {% if field.help_text %}
                <span class="helptext">{{ field.help_text }}</span>
            {% endif %}
        </div>
    {% endfor %}

    <button type="submit">注册</button>
  </form> 
</div>
{% endblock %}

/* inputs.css 或 signup.css */

/* 错误信息样式 */
.errorlist {
    color: red;
    font-size: 0.85em;
    margin-top: 5px;
    padding-left: 0;
    list-style: none; /* 移除列表点 */
}

/* 帮助文本样式 */
.helptext {
    color: #666;
    font-size: 0.85em;
    margin-top: 5px;
    display: block; /* 确保独占一行 */
}

/* 现有 CSS 保持不变 */
.signup{    
    padding-top: 2.5rem;
    padding-bottom: 2.5rem;
    width: 320px;
    margin:auto 55px;
}

.group            { 
  position: relative; 
  margin-bottom:45px; 
}
input               {
  font-size:18px;
  padding:10px 10px 10px 0px;
  display:block;
  width:320px;
  border:none;
  border-bottom:1px solid #999;
}
input:focus         { outline:none; }

/* LABEL ======================================= */
label                {
  color:#999; 
  font-size:18px;
  font-weight:normal;
  position:absolute;
  pointer-events:none;
  left:5px;
  top:10px;
  transition:0.2s ease all; 
  -moz-transition:0.2s ease all; 
  -webkit-transition:0.2s ease all;
}

/* active state */
input:focus ~ label, input:valid ~ label        {
  top:-20px;
  font-size:14px;
  color: black;
}

/* BOTTOM BARS ================================= */
.bar    { position:relative; display:block; width:320px; }
.bar:before, .bar:after     {
  content:'';
  height:2px; 
  width:0;
  bottom:1px; 
  position:absolute;
  background:black; 
  transition:0.2s ease all; 
  -moz-transition:0.2s ease all; 
  -webkit-transition:0.2s ease all;
}
.bar:before {
  left:50%;
}
.bar:after {
  right:50%; 
}

/* active state */
input:focus ~ .bar:before, input:focus ~ .bar:after {
  width:50%;
}

/* HIGHLIGHTER ================================== */
.highlight {
  position:absolute;
  height:60%; 
  width:100px; 
  top:25%; 
  left:0;
  pointer-events:none;
  opacity:0.5;
}

/* active state */
input:focus ~ .highlight {
  -webkit-animation:inputHighlighter 0.3s ease;
  -moz-animation:inputHighlighter 0.3s ease;
  animation:inputHighlighter 0.3s ease;
}

/* ANIMATIONS ================ */
@-webkit-keyframes inputHighlighter {
    from { background:#5264AE; }
  to    { width:0; background:transparent; }
}
@-moz-keyframes inputHighlighter {
    from { background:#5264AE; }
  to    { width:0; background:transparent; }
}
@keyframes inputHighlighter {
    from { background:#5264AE; }
  to    { width:0; background:transparent; }
}