Common form of the form processing:

reg.html：

<! DOCTYPE HTML> 
<HTML lang = "EN"> 
<head> 
    <Meta charset = "UTF-8"> 
    <title> Registration Page </ title> 
</ head> 
<body> 

<form Action = "/ REG / "Method =" POST "> 
    {%}% csrf_token 
    <P> username: 
        <INPUT type =" text "name =" username "> 
        <span> error.user {{}} </ span> {# if there is an error ,} to obtain the error message # 
    </ P> 
    <P> password: 
        <INPUT type = "password" name = "pwd"> 
        <span> error.pwd {{}} </ span> {# if there is an error, it Get error} # 
    </ P> 
    <P> 
        <INPUT type = "submit">
    </p>
</form>

</body>
</html>

views.py：

Import the render django.shortcuts from, the HttpResponse 
from app01 Import Models 


DEF REG (Request): 
    error = { "User": "", "pwd": ""} # a dictionary stored with an error message 
    if request.method == " the POST ": 
        username = request.POST.get (" username ") 
        password = request.POST.get (" pwd ") 

        IF len (username)>. 5: 
            error [" user "] =" user name can not be greater than 5 " 
        IF len (password) <. 6: 
            error [ "pwd"] = "password can not be less than 6" 
        elif len (password)> 10: 
            error [ "pwd"] = "password can not be greater than 10" 

    return the render (Request, " reg.html ", {" error ": error})

Visit, http: //127.0.0.1: 8000 / reg /

Input is greater than 5-digit user name and password for more than 10 digits

Processing components form using form:

reg2.html：

<! DOCTYPE HTML> 
<HTML lang = "EN"> 
<head> 
    <Meta charset = "UTF-8"> 
    <title> Registration Page </ title> 
</ head> 
<body> 

<form Action = "/ reg2 / "Method =" POST "NOVALIDATE> 
    {% csrf_token%} 
    {} {} {# form_obj.as_p displayed in the tap form p} # 
{# {} {} {# form_obj.errors.username obtain separate error message #} username 
{# {{form_obj.errors.password}} { # acquired separately password error message} # 
    <P> <INPUT type = "Submit"> </ P> 
</ form> 

</ body> 
</ HTML>

form_obj can get directly to the username, password error, the errors can also be obtained separately

views.py：

Import the render django.shortcuts from, the HttpResponse 
from app01 Import Models 


from Django Forms # Import component introduced form 


# define a form class 
class regform (forms.Form): 
    username = forms.CharField ( 
        min_length =. 5, 
        label = "User Name", # set the tag name 
        # error 
        error_messages = { 
            "min_length": "user name can not be greater than 5!" 
        } 
    ) 
    password = forms.CharField ( 
        min_length =. 6, 
        label = "password", set the label # 
        # error 
        error_messages {= 
            "min_length": "passwords can not be less than six!"
        } 
    )

 
DEF REG2 (Request):
    form_obj = RegForm () # GET request, the object is instantiated form

    request.method == IF "POST": 
        form_obj = regform (request.POST) 
        # form to help us do check 
        if form_obj.is_valid (): # determine whether there is value form_obj 
            Pass 

    return the render (Request, "reg2.html", { "form_obj": form_obj})

Visit, http: //127.0.0.1: 8000 / reg2 /

Python - Django - form the basic component usage

Common form of the form processing:

Processing components form using form:

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