2. form component uses

1. The verification data to the front end

2. Generate HTML tag page

3. Leave the previous entry, clear the password

Create a form class

from django import forms

class UserInfo(forms.Form):

　　user = forms.CharField(max_length = 32)

　　age = forms.InterField( )

　　email = forms.EmailField( )

 

use

fm = UserInfor({"user":"fu", "age":20, "email":"[email protected]"})

Check whether the data is valid: fm.is_vaild () returns True and False

View all legitimate data ret = fm.cleaned_data () Gets the user, age, email with get value

View illegal data and reasons ret = fm.error ()  

form rendering label

1. {{fm.as_p}} render all forms 

2. {{fm.user}}, {{fm.age}} rendering specifying form strong controllability, the label attribute specifies the class in the form {{fm.user.label}}

3. rely write cycle

{%  for hm in fm  %}

　　{{  hm.label  }}{{   fm  }}

　　{{  hm.error  }}

{%  endfor  %}

In view function, the correct check data stored incoming tip of fm = fm.cleaned_data ()

The next time the input has not entered the correct data again

form Tags Add css styles

from django import forms

class UserInfo(forms.Form):
　　msg = {"required":"改字段不能为空"}
　　user = forms.CharField(max_length = 32)
　　age = forms.InterField( )　　
　　email = forms.EmailField( 
        widget = widgets.TextInput(attrs={'class': 'form-control'})，
　　　　 label = "邮箱"，
　　　　 error_msg = msg,
　　　　 initial = "默认值"
　　  
)        

Add a label here to email btn of css styles, the field is empty when the error is displayed when rendering defaults

hook

from django import forms
from django.core.exceptions import ValidationError

# Login form  
class UserInfoForm (forms.Form): 
　　User = forms.charField (MAX_LENGTH = 32 ) 
　　password = forms.CharField (MAX_LENGTH = 32 ) 
　　In Email = forms.EmailField () 
　　
　　DEF clean_user (Self): 
　　　　User = self.cleaned_data. GET ( " the user " ) 
　　　　RET = UserInfo.objects.filter (the user = the user) # found data in the database  
　　　　IF RET: 
　　　　　　return RET 
　　　　the else : 
　　　　　　the raise validateError ( " username does not exist " )