django form 介绍
django form 介绍
Get，Post使用方法
GET and POST are the only HTTP methods to use when dealing with forms.
使用Get方法，请求报文实体主体为空，Post方法时，用户在表单字段中输入的内容即为实体主体。
Get的方法可在请求的URL中包括输入的数据，如“www.somesite.com/animalsearch?monkeys&bananas”
Any request that could be used to change the state of the system - for example, a request that makes changes in the database - should use POST. GET should be used only for requests that do not affect the state of the system.
GET is suitable for things like a web search form, because the URLs that represent a GET request can easily be bookmarked
The Django Form class
a form class’s fields map to HTML form<input>elements
form运用
from django import forms
class NameForm(forms.Form):
your_name = forms.CharField(label='Your name', max_length=100)
一个field对应一个<label>
Form实例含有is_vaild()方法
它确保表单中的数据正确无误，并将其置入cleaned_date中
发送来的表单数据由view处理，例如
from django.shortcuts import render
from django.http import HttpResponseRedirect
from .forms import NameForm
def get_name(request):
# if this is a POST request we need to process the form data
if request.method == 'POST':
# create a form instance and populate it with data from the request:
form = NameForm(request.POST)
# check whether it's valid:
if form.is_valid():
# process the data in form.cleaned_data as required
# ...
# redirect to a new URL:
return HttpResponseRedirect('/thanks/')
# if a GET (or any other method) we'll create a blank form
else:
form = NameForm()
return render(request, 'name.html', {'form': form})
django设计了一种方法来避免重复代码
假如forms.py中代码如下
from django import forms
class ContactForm(forms.Form):
name = forms.CharField()
message = forms.CharField(widget=forms.Textarea)
def send_email(self):
# send email using the self.cleaned_data dictionary
pass
view中代代码可改写如下
from myapp.forms import ContactForm
from django.views.generic.edit import FormView
class ContactView(FormView):
template_name = 'contact.html'
form_class = ContactForm
success_url = '/thanks/'
def form_valid(self, form):
# This method is called when valid form data has been POSTed.
# It should return an HttpResponse.
form.send_email()
return super(ContactView, self).form_valid(form)
