Python Road 71-django Form component

Directory

First, Introduction

Ii. examples

Third, Form class

Iv. common selection of plug-ins

Five, custom validation rules

Vi. Initializing data

First, Introduction

Django's form has the following major functions

Generate HTML tags

Validating user data (displaying error messages)

HTML form submission holds last commit data

Initialize page display content

Ii. examples

url.py

From django.conf.urls import urlfrom django.contrib import adminfrom app01 import viewsurlpatterns = [url (r ' ^admin/'), admin.site.urls), url (r ' ^fm/', views.fm),]

views.py

from django import formsfrom app01 import modelsfrom django.forms  IMPORT WIDGETSFROM DJANGO.FORMS IMPORT FIELDSCLASS FM (forms. Form) The:    #  field itself only does the validation     user = fields. Charfield (error_messages={"required":  "user name cannot be empty"},                             Widget=widgets. Textarea (attrs={"class":  "C1"})     pwd = fields. Charfield (        max_length=12,         min_length=6,        error_messages={"Required":  " Password cannot be empty ", " max_length ": " password length cannot be greater than ", " min_length ": " password length cannot be less than 6 ",},         widgets=widgets. Passwordinput ()     )     email = fields. Emailfield (error_messages={"Required":  "Mailbox cannot be empty",  "Invalid":  "Mailbox Format Error"}) DEF FM (Request):     if request.method ==  "GET":         OBJ = FM ()         return render (request,  " Fm.html ",  {" obj ":  obj})     elif request.method == " POST ":         #  get all the data for the user         #   Validation         #  success for each data request: Get all the right information          #  Failure: page display error message         OBJ = FM ( Request. POST)         res = obj.is_valid ()          if res:       &nbSp;    models. UserInfo.objects.create (**obj.cleaned_data)         else:             return render (request,  "fm.html",  { "obj":  obj})

Fm.html

<! DOCTYPE html>

 
  
 
Third, Form class
When creating a form class, it mainly involves fields and plug-ins, which are used to validate user-requested data, and plug-ins are used to automatically generate HTML

1.Django built-in fields
field    required=true,                 whether to allow Nulls     widget=None,                  html plug-in     label=None,                    Used to generate label labels or display content     initial=None,                  initial value     help_text= ',                  Help information (displayed next to the label)      error_messages=none,          error message  {' required ':  ' cannot be empty ',   ' invalid ':  ' format error '}    show_hidden_initial=false,    Whether to add a hidden and default plug-in after the current plug-in (can be used to verify that two inputs are always)     validators=[],                 Custom validation rules     localize=False,                whether to support localization     disabled=False,                Whether you can edit     label_suffix=none             label content suffix   charfield (Field)     max_length=None,               Maximum length     min_length=None,               Minimum Length     strip=True                     whether to remove user input blank  integerfield (Field)      max_value=none,               Maximum Value      min_value=None,               Minimum value  floatfield (Integerfield)     ... decimalfield (Integerfield)      max_value=None,               Maximum Value     min_value=None,                Minimum Value     max_digits=None,               Total length     decimal_places=None,           decimal Length  basetemporalfield (Field)     input_formats=None            time Format     datefield (Basetemporalfield )      Format: 2015-09-01timefield (Basetemporalfield)      format: 11:12datetimefield (Basetemporalfield) Format: 2015-09-01 11:12 durationfield (Field)               time interval:%d %h:%m:%s.%f    ... regexfield (Charfield)      regex,                        self-customizing regular expressions     max_length=None,              Maximum length     min_length=None,              Minimum Length     error_message=None,           Ignore, error message using  error_messages={' invalid ':  ' ... '}  Emailfield (Charfield)           ... filefield (Field)     allow_empty_file=false      Allow empty files  imagefield (Filefield)            ...     Note: Requires PIL module,pip3 install pillow      above two dictionaries to use, you need to note two points:         - form form  enctype= "multipart/ Form-data "        - view function in  obj = myform (request. Post, request. FILES)  urlfield (field)     ...  booleanfield (field)        ... nullbooleanfield (Booleanfield)     ... choicefield (Field)      ...    choices= (),                  options such as:choices =  ((0, ' Shanghai '), (1, ' Beijing '),)      required=True,              is required  & NBsp;  widget=none,                 Plugins, default select Plugins     label=None,                 label content     initial=None,                initial value     help_text= ',                Help Tips   modelchoicefield (Choicefield)     ...                          django.forms.models.modelchoicefield    queryset,                   #  querying data in a database      empty_label= "---------",   #  in default empty displayCapacity     to_field_name=None,        #  fields for value in HTML     limit_choices_to=None      #  Modelform in Queryset two filters      modelmultiplechoicefield (Modelchoicefield)      ...                         django.forms.models.ModelMultipleChoiceField        typedchoicefield (Choicefield)     coerce = lambda  val: val    Convert the selected values once     empty_value=  '               default value for null value  multiplechoicefield (Choicefield)      ... typedmultiplechoicefield (Multiplechoicefield)     coerce =  lambda val: val    Convert each selected value one at a time     empty_value=  '               default value for null value  combofield (Field)     fields= ()                     use multiple validations as follows: The maximum length of 20 is verified, Also verify the mailbox format                                 fields.combofield (Fields=[fields. Charfield (max_length=20),  fields. Emailfield (),])  multivaluefield (Field)     PS:  abstract class, subclasses can be implemented to aggregate multiple dictionaries to match a value, To cooperate with Multiwidget using  splitdatetimefield (Multivaluefield)     input_date_formats=none,     format list: ['%y--%m--%d ',  '%m%d/%y ',  '%m/%d/%y ']    input_time_ formats=none     format list: ['%h:%m:%s ',  '%h:%m:%s.%f ',  '%h:%m '] filepatHfield (Choicefield)       file options, directories under files are displayed in the page     path,                         Folder path     match=None,                  Regular Matching     recursive=False,             Recursive folders below     allow_files=True,            Allow files     allow_folders=False,         Allow folders     required=True,    widget=None,     label=none,    initial=none,    help_text= '   Genericipaddressfield    protocol= ' both ',            both,ipv4, IPv6 supported IP formats     unpack_ipv4=False            Parse IPv4 address, if:: ffff:192.0.2.1, can be resolved to 192.0.2.1, ps:protocol must be both to enable  slugfield (Charfield)             numbers, letters, underscores, minus (hyphens)       uuidfield (Charfield)            uuid type    &NBSP;&NBSP, .....

Note: UUID is a non-repeating random string created based on Mac and current time, etc.
>>> import uuid    # make a uuid based on  the host ID and current time    >>>  UUID.UUID1 ()     # doctest: +skip    uuid (' A8098C1A-F86E-11DA-BD1A-00112444BE1E ')     # make a uuid using an  MD5 hash of a namespace UUID and a name     &GT;&GT;&GT;&NBSP;UUID.UUID3 (UUID. namespace_dns,  ' python.org ')     uuid (' 6fa459ea-ee8a-3ca4-894e-db77e160355e ')      # make a random uuid    >>> uuid.uuid4 ()     # doctest: +skip    uuid (' 16fd2706-8baf-433b-82eb-8c7fada847da ')     # make a uuid using a  sha-1 hash of a nAMESPACE&NBSP;UUID&NBSP;AND&NBSP;A&NBSP;NAME&NBSP;&NBSP;&NBSP;&NBSP;&GT;&GT;&GT;&NBSP;UUID.UUID5 (UUID. namespace_dns,  ' python.org ')     uuid (' 886313e1-3b8a-5372-9b90-0c9aee199e5d ')      # make a UUID from a string of hex digits  (braces and hyphens ignored)     >>> x = uuid. UUID (' {00010203-0405-0607-0809-0a0b0c0d0e0f} ')     # convert a uuid to  a string of hex digits in standard form    > &GT;&GT;&NBSP;STR (x)      ' 00010203-0405-0607-0809-0a0b0c0d0e0f '     #  get the raw 16 bytes of the UUID    >>>  x.bytes    b ' \x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f '      # make a&nbsP Uuid from a 16-byte string    >>> uuid. UUID (bytes=x.bytes)     uuid (' 00010203-0405-0607-0809-0a0b0c0d0e0f ')

2.Django Internal Plug-in
TextInput (Input) numberinput (TextInput) EmailInput (TextInput) urlinput (TextInput) passwordinput (TextInput) Hiddeninput (TextInput) Textarea (Widget) dateinput (datetimebaseinput) datetimeinput (datetimebaseinput) Timeinput ( Datetimebaseinput) Checkboxinputselectnullbooleanselectselectmultipleradioselectcheckboxselectmultiplefileinputclearablefileinputmultiplehid Deninputsplitdatetimewidgetsplithiddendatetimewidgetselectdatewidget

Iv. common selection of plug-ins


Five, custom validation rules


Vi. Initializing data

This article is from the "Eight Miles" blog, so be sure to keep this source http://5921271.blog.51cto.com/5911271/1930342
Python Road 71-django Form component