表单的使用流程
1. 定义
- terminal 输入 django-admin startapp the_14回车
- tutorial子文件夹 settings.py INSTALLED_APPS 中括号添加 "the_14",
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
"the_3",
"the_5",
"the_6",
"the_7",
"the_8",
"the_9",
"the_10",
"the_12",
"the_13",
"the_14",
]- tutorial子文件夹 urls.py
python
from django.contrib import admin
from django.urls import path,include
import the_3.urls
urlpatterns = [
path('admin/', admin.site.urls),
path('the_3/', include('the_3.urls')),
path('the_4/', include('the_4.urls')),
path('the_5/', include('the_5.urls')),
path('the_7/', include('the_7.urls')),
path('the_10/', include('the_10.urls')),
path('the_12/', include('the_12.urls')),
path('the_13/', include('the_13.urls')),
path('the_14/', include('the_14.urls')),
]- the_14 子文件夹添加 urls.py
python
from django.urls import path
from .views import hello
urlpatterns = [
path('hello/', hello),
]- the_14\views.py
python
from django.http import HttpResponse
from django.shortcuts import render
# Create your views here.
def hello(request):
return HttpResponse('hello world')- 运行tutorial, 点击 http://127.0.0.1:8000/， 浏览器地址栏 127.0.0.1:8000/the_14/hello/ 刷新
- 定义表单， 在 the_14文件夹创建 forms.py文件
python
from django import forms
class NameForm(forms.Form):
your_name = forms.CharField(label='你的名字', max_length=10)- the_14\views.py
python
from django.http import HttpResponse
from django.shortcuts import render
# Create your views here.
def hello(request):
return render(request, 'the_14/hello.html')- templates创建the_14子文件夹，再在 the_14子文件夹创建 hello.html
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h1>我是表单页面</h1>
</body>
</html>- 运行tutorial, 点击 http://127.0.0.1:8000/， 浏览器地址栏 127.0.0.1:8000/the_14/hello/ 刷新
- 我想把form的内容渲染到前端去，首先the_14\views.py 写入
python
from django.http import HttpResponse
from django.shortcuts import render
from .forms import NameForm
# Create your views here.
def hello(request):
form = NameForm()
return render(request, 'the_14/hello.html', {'myform':form})其次，在 template\the_14\hello.html
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h1>我是表单页面</h1>
{{ myform }}
</body>
</html>刷新网页
注意： 这里是没办法提交的，如果想提交， 需要嵌套一个form表单
<body> <h1>我是表单页面</h1> <form action=""> {{ myform }} </form> </body>
表单的绑定与非绑定
绑定就是说表单里面有值了，非绑定就是表单里面还没有值
表单提交了就是有值， 没有提交或者提交错误就是拿不到值， 拿不到值就是非绑定的状态。
怎么证明表单里面没有值
the_14\views.py
python
from django.http import HttpResponse
from django.shortcuts import render
from .forms import NameForm
# Create your views here.
def hello(request):
form = NameForm()
import pdb
pdb.set_trace()
return render(request, 'the_14/hello.html', {'myform':form})重新运行，刷新网页， terminal 输入 p form 回车
-> return render(request, 'the_14/hello.html', {'myform':form})
(Pdb) p form
<NameForm bound=False, valid=Unknown, fields=(your_name)>
bound=False 就是非绑定的状态
terminal 再输入 p dir(form) 回车
(Pdb) p dir(form)
'__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getstate__', '__gt__', '__hash__', '__html__', '__init__', '__init_subclass__', '__iter__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_bound_fields_cache', '_clean_fields', '_clean_form', '_errors', '_html_output', '_post_clean', 'add_error', 'add_initial_prefix', 'add_prefix', 'as_p', 'as_table', 'as_ul', 'auto_id', 'base_fields', 'changed_data', 'clean', 'data', 'declared_fields', 'default_renderer', 'empty_permitted', 'error_class', 'errors', 'field_order', 'fields', 'files', 'full_clean', 'get_initial_for_field', 'has_changed', 'has_error', 'hidden_fields', 'initial', 'is_bound', 'is_multipart', 'is_valid', 'label_suffix', 'media', 'non_field_errors', 'order_fields', 'prefix', 'renderer', 'use_required_attribute', 'visible_fields'
is_bound 判断是否绑定的状态
terminal 输入 p form.is_bound回车 ， False指的是非绑定状态
(Pdb) p form.is_bound
False
terminal 输入 c回车， 结束调试
(Pdb) c
07/Jan/2024 19:10:13\] "GET /the_14/hello/ HTTP/1.1" 200 344 ### 2.渲染 #### 渲染表单到模板 ``` {{ form.as_table }}、{{ form.as_table }}、{{ form.as_p }}、{{ form.as_ul }} ``` ``` {{ form.attr }} ``` the_14\\hello.html ```html
我是表单页面
``` #### 表单验证 * 字段验证 * 基于cleaned_data的类方法： clean_\我是表单页面
``` the_14\\urls.py ```python from django.urls import path from .views import hello urlpatterns = [ path('hello/', hello, name='form_hello'), ] ``` the_14\\views.py ```python from django.http import HttpResponse from django.shortcuts import render from .forms import NameForm # Create your views here. def hello(request): form = NameForm() # import pdb # pdb.set_trace() print(form.is_bound) return render(request, 'the_14/hello.html', {'myform':form}) ``` 刷新网页，输入名字panda, 点击上传，可以看到有两个False, 执行了两次。  False \[07/Jan/2024 20:56:07\] "GET /the_14/hello/ HTTP/1.1" 200 352 False \[07/Jan/2024 20:56:13\] "POST /the_14/hello/ HTTP/1.1" 200 352 第二次优化 the_14\\views.py ```python from Scripts.bottle import view from django.http import HttpResponse from django.shortcuts import render from .forms import NameForm # Create your views here. # def hello(request): # request.method = 'GET' # form = NameForm() # # import pdb # # pdb.set_trace() # print(form.is_bound) # return render(request, 'the_14/hello.html', {'myform':form}) class Hello(view): def get(self, request): form = NameForm() return render(request, 'the_14/hello.html', {'myform': form}) def post(self,request): form = NameForm(request.POST) return render(request, 'the_14/hello.html', {'myform': form,'post':True}) ``` the_14\\urls.py ```python from django.urls import path from .views import Hello urlpatterns = [ # path('hello/', hello, name='form_hello'), path('hello/', Hello.as_view(), name='form_hello'), ] ``` 刷新网页，输入 panda提交， 浏览器页面会出来 这里是post返回的内容。 ##### 字段验证 输入的字段受 max_length的长度限制 ##### 基于cleaned_data的类方法： clean_\我是表单页面
{% if post %}这里是post返回的内容
{% endif %}
```
刷新网页
templates\\the_14\\hello.html 也可以只写 {{ myform }}
>
> ```
>
> ```
刷新网页
the_14\\forms.py
```python
from django import forms
class NameForm(forms.Form):
your_name = forms.CharField(label='你的名字', max_length=10)
your_title = forms.CharField(label='你的头衔', max_length=10)
def clean_your_name(self): # 专门校验your_name
your_name = self.cleaned_data.get('your_name', '')
if your_name.startswith('fuck'):
raise forms.ValidationError('不能带脏字哟！') # 不通过就主动抛出错误
return your_name
"""
如果名字以pd开头，头衔必须使用金牌
"""
def clean(self):
name = self.cleaned_data.get('your_name','')
title = self.cleaned_data.get('your_title', '')
if name.startswith('pd_') and title != "金牌":
raise forms.ValidationError('如果名字以pd开头，头衔必须使用金牌')
```
刷新网页，输入 fuck_panda , pfshjln 上传
```
如果使用['your_name']自定义的验证之后，还会进行clean()的联合校验，但是自定义没有通过，数据是不会填充到clean里面来的，所以
self.cleaned_data['your_name'] 是取不到值的
```
##### 属性验证
the_14\\forms.py
```python
from django import forms
from django.core.validators import MinLengthValidator
class NameForm(forms.Form):
your_name = forms.CharField(label='你的名字', max_length=10,validators=[MinLengthValidator(3,'你的长度应该要大于3个')])
your_title = forms.CharField(label='你的头衔', max_length=10)
```
刷新网页，填入 1， unknown, 点击上传， 浏览器返回
##### 自定义验证器 - （from django.core import validators）
the_14\\forms.py
```python
from django import forms
from django.core.validators import MinLengthValidator
def my_validator(value):
if len(value) < 4:
raise forms.ValidationError('你写少了，赶紧修改')
class NameForm(forms.Form):
# your_name = forms.CharField(label='你的名字', max_length=10,validators=[MinLengthValidator(3,'你的长度应该要大于3个')])
your_name = forms.CharField(label='你的名字', max_length=10, validators=[my_validator])
your_title = forms.CharField(label='你的头衔', max_length=10)
```
刷新网页，输入 111， unknown 点击上传
### 3. 提交
## 4. 校验
### 5. 保存