# dokumentasi Django 2.0.8

# Bidang formulir

class `Field`(**kwargs)

When you create a `Form` class, the most important part is defining the fields of the form. Each field has custom validation logic, along with a few other hooks.

`Field.``clean`(value)

Although the primary way you'll use `Field` classes is in `Form` classes, you can also instantiate them and use them directly to get a better idea of how they work. Each `Field` instance has a `clean()` method, which takes a single argument and either raises a `django.forms.ValidationError` exception or returns the clean value:

    >>> from django import forms
    >>> f = forms.EmailField()
    >>> f.clean('foo@example.com')
    'foo@example.com'
    >>> f.clean('invalid email address')
    Traceback (most recent call last):
    ...
    ValidationError: ['Enter a valid email address.']

## Argumen bidang inti

Each `Field` class constructor takes at least these arguments. Some `Field` classes take additional, field-specific arguments, but the following should always be accepted:

### `required`

`Field.``required`

By default, each `Field` class assumes the value is required, so if you pass an empty value -- either `None` or the empty string (`""`) -- then `clean()` will raise a `ValidationError` exception:

    >>> from django import forms
    >>> f = forms.CharField()
    >>> f.clean('foo')
    'foo'
    >>> f.clean('')
    Traceback (most recent call last):
    ...
    ValidationError: ['This field is required.']
    >>> f.clean(None)
    Traceback (most recent call last):
    ...
    ValidationError: ['This field is required.']
    >>> f.clean(' ')
    ' '
    >>> f.clean(0)
    '0'
    >>> f.clean(True)
    'True'
    >>> f.clean(False)
    'False'

Untuk menentukan bahwa bidang adalah tidak diwajibkan, lewatkan `required=False` ke pembangun `Field`:

    >>> f = forms.CharField(required=False)
    >>> f.clean('foo')
    'foo'
    >>> f.clean('')
    ''
    >>> f.clean(None)
    ''
    >>> f.clean(0)
    '0'
    >>> f.clean(True)
    'True'
    >>> f.clean(False)
    'False'

If a `Field` has `required=False` and you pass `clean()` an empty value, then `clean()` will return a normalized empty value rather than raising `ValidationError`. For `CharField`, this will be an empty string. For other `Field` classes, it might be `None`. (This varies from field to field.)

Widgets of required form fields have the `required` HTML attribute. Set the `Form.use_required_attribute` attribute to `False` to disable it. The `required` attribute isn't included on forms of formsets because the browser validation may not be correct when adding and deleting formsets.

### `label`

`Field.``label`

The `label` argument lets you specify the "human-friendly" label for this field. This is used when the `Field` is displayed in a `Form`.

As explained in "Outputting forms as HTML" above, the default label for a `Field` is generated from the field name by converting all underscores to spaces and upper-casing the first letter. Specify `label` if that default behavior doesn't result in an adequate label.

Here's a full example `Form` that implements `label` for two of its fields. We've specified `auto_id=False` to simplify the output:

    >>> from django import forms
    >>> class CommentForm(forms.Form):
    ...     name = forms.CharField(label='Your name')
    ...     url = forms.URLField(label='Your website', required=False)
    ...     comment = forms.CharField()
    >>> f = CommentForm(auto_id=False)
    >>> print(f)
    <tr><th>Your name:</th><td><input type="text" name="name" required /></td></tr>
    <tr><th>Your website:</th><td><input type="url" name="url" /></td></tr>
    <tr><th>Comment:</th><td><input type="text" name="comment" required /></td></tr>

### `label_suffix`

`Field.``label_suffix`

The `label_suffix` argument lets you override the form's `label_suffix` on a per-field basis:

    >>> class ContactForm(forms.Form):
    ...     age = forms.IntegerField()
    ...     nationality = forms.CharField()
    ...     captcha_answer = forms.IntegerField(label='2 + 2', label_suffix=' =')
    >>> f = ContactForm(label_suffix='?')
    >>> print(f.as_p())
    <p><label for="id_age">Age?</label> <input id="id_age" name="age" type="number" required /></p>
    <p><label for="id_nationality">Nationality?</label> <input id="id_nationality" name="nationality" type="text" required /></p>
    <p><label for="id_captcha_answer">2 + 2 =</label> <input id="id_captcha_answer" name="captcha_answer" type="number" required /></p>

### `initial`

`Field.``initial`

The `initial` argument lets you specify the initial value to use when rendering this `Field` in an unbound `Form`.

Untuk menentukan data awal dinamis, lihat parameter `Form.initial`.

The use-case for this is when you want to display an "empty" form in which a field is initialized to a particular value. For example:

    >>> from django import forms
    >>> class CommentForm(forms.Form):
    ...     name = forms.CharField(initial='Your name')
    ...     url = forms.URLField(initial='http://')
    ...     comment = forms.CharField()
    >>> f = CommentForm(auto_id=False)
    >>> print(f)
    <tr><th>Name:</th><td><input type="text" name="name" value="Your name" required /></td></tr>
    <tr><th>Url:</th><td><input type="url" name="url" value="http://" required /></td></tr>
    <tr><th>Comment:</th><td><input type="text" name="comment" required /></td></tr>

You may be thinking, why not just pass a dictionary of the initial values as data when displaying the form? Well, if you do that, you'll trigger validation, and the HTML output will include any validation errors:

    >>> class CommentForm(forms.Form):
    ...     name = forms.CharField()
    ...     url = forms.URLField()
    ...     comment = forms.CharField()
    >>> default_data = {'name': 'Your name', 'url': 'http://'}
    >>> f = CommentForm(default_data, auto_id=False)
    >>> print(f)
    <tr><th>Name:</th><td><input type="text" name="name" value="Your name" required /></td></tr>
    <tr><th>Url:</th><td><ul class="errorlist"><li>Enter a valid URL.</li></ul><input type="url" name="url" value="http://" required /></td></tr>
    <tr><th>Comment:</th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="text" name="comment" required /></td></tr>

This is why `initial` values are only displayed for unbound forms. For bound forms, the HTML output will use the bound data.

Also note that `initial` values are not used as "fallback" data in validation if a particular field's value is not given. `initial` values are only intended for initial form display:

    >>> class CommentForm(forms.Form):
    ...     name = forms.CharField(initial='Your name')
    ...     url = forms.URLField(initial='http://')
    ...     comment = forms.CharField()
    >>> data = {'name': '', 'url': '', 'comment': 'Foo'}
    >>> f = CommentForm(data)
    >>> f.is_valid()
    False
    # The form does *not* fall back to using the initial values.
    >>> f.errors
    {'url': ['This field is required.'], 'name': ['This field is required.']}

Instead of a constant, you can also pass any callable:

    >>> import datetime
    >>> class DateForm(forms.Form):
    ...     day = forms.DateField(initial=datetime.date.today)
    >>> print(DateForm())
    <tr><th>Day:</th><td><input type="text" name="day" value="12/23/2008" required /><td></tr>

The callable will be evaluated only when the unbound form is displayed, not when it is defined.

### `widget`

`Field.``widget`

The `widget` argument lets you specify a `Widget` class to use when rendering this `Field`. See Widget for more information.

### `help_text`

`Field.``help_text`

The `help_text` argument lets you specify descriptive text for this `Field`. If you provide `help_text`, it will be displayed next to the `Field` when the `Field` is rendered by one of the convenience `Form` methods (e.g., `as_ul()`).

Like the model field's `help_text`, this value isn't HTML-escaped in automatically-generated forms.

Here's a full example `Form` that implements `help_text` for two of its fields. We've specified `auto_id=False` to simplify the output:

    >>> from django import forms
    >>> class HelpTextContactForm(forms.Form):
    ...     subject = forms.CharField(max_length=100, help_text='100 characters max.')
    ...     message = forms.CharField()
    ...     sender = forms.EmailField(help_text='A valid email address, please.')
    ...     cc_myself = forms.BooleanField(required=False)
    >>> f = HelpTextContactForm(auto_id=False)
    >>> print(f.as_table())
    <tr><th>Subject:</th><td><input type="text" name="subject" maxlength="100" required /><br /><span class="helptext">100 characters max.</span></td></tr>
    <tr><th>Message:</th><td><input type="text" name="message" required /></td></tr>
    <tr><th>Sender:</th><td><input type="email" name="sender" required /><br />A valid email address, please.</td></tr>
    <tr><th>Cc myself:</th><td><input type="checkbox" name="cc_myself" /></td></tr>
    >>> print(f.as_ul()))
    <li>Subject: <input type="text" name="subject" maxlength="100" required /> <span class="helptext">100 characters max.</span></li>
    <li>Message: <input type="text" name="message" required /></li>
    <li>Sender: <input type="email" name="sender" required /> A valid email address, please.</li>
    <li>Cc myself: <input type="checkbox" name="cc_myself" /></li>
    >>> print(f.as_p())
    <p>Subject: <input type="text" name="subject" maxlength="100" required /> <span class="helptext">100 characters max.</span></p>
    <p>Message: <input type="text" name="message" required /></p>
    <p>Sender: <input type="email" name="sender" required /> A valid email address, please.</p>
    <p>Cc myself: <input type="checkbox" name="cc_myself" /></p>

### `error_messages`

`Field.``error_messages`

The `error_messages` argument lets you override the default messages that the field will raise. Pass in a dictionary with keys matching the error messages you want to override. For example, here is the default error message:

    >>> from django import forms
    >>> generic = forms.CharField()
    >>> generic.clean('')
    Traceback (most recent call last):
      ...
    ValidationError: ['This field is required.']

Dan ini adalah pesan kesalahan penyesuaian:

    >>> name = forms.CharField(error_messages={'required': 'Please enter your name'})
    >>> name.clean('')
    Traceback (most recent call last):
      ...
    ValidationError: ['Please enter your name']

In the built-in Field classes section below, each `Field` defines the error message keys it uses.

### `validators`

`Field.``validators`

Argumen `validators` membiarkan anda menyediakan daftar dari fungsi pengecekan untuk bidang ini.

Lihat validators documentation untuk informasi lebih.

### `localize`

`Field.``localize`

The `localize` argument enables the localization of form data input, as well as the rendered output.

Lihat dokuemntasi format localization untuk informasi lebih.

### `disabled`

`Field.``disabled`

The `disabled` boolean argument, when set to `True`, disables a form field using the `disabled` HTML attribute so that it won't be editable by users. Even if a user tampers with the field's value submitted to the server, it will be ignored in favor of the value from the form's initial data.

## Memeriksa jika data bidang telah berubah

### `has_changed()`

`Field.``has_changed`()

The `has_changed()` method is used to determine if the field value has changed from the initial value. Returns `True` or `False`.

Lihat dokumentasi `Form.has_changed()` untuk informasi lebih.

## Built-in `Field` classes

Naturally, the `forms` library comes with a set of `Field` classes that represent common validation needs. This section documents each built-in field.

For each field, we describe the default widget used if you don't specify `widget`. We also specify the value returned when you provide an empty value (see the section on `required` above to understand what that means).

### `BooleanField`

class `BooleanField`(**kwargs)
  - Widget awal: `CheckboxInput`
  - Nilai kosong: `False`
  - Normalizes to: A Python `True` or `False` value.
  - Validates that the value is `True` (e.g. the check box is checked) if the field has `required=True`.
  - Kunci pesan kesalahan: `required`

  Catatan

  Since all `Field` subclasses have `required=True` by default, the validation condition here is important. If you want to include a boolean in your form that can be either `True` or `False` (e.g. a checked or unchecked checkbox), you must remember to pass in `required=False` when creating the `BooleanField`.

### `CharField`

class `CharField`(**kwargs)
  - Widget awal: `TextInput`
  - Empty value: Whatever you've given as `empty_value`.
  - Normalizes to: A string.
  - Mensahkan `max_length` atau `min_length`, jika mereka disediakan. Jika tidak, semua masukan adalah sah.
  - Error message keys: `required`, `max_length`, `min_length`

  Has three optional arguments for validation:

  `max_length`
  `min_length`

  If provided, these arguments ensure that the string is at most or at least the given length.

  `strip`

    Jika `True` (awalan), nilai akan dilucuti dari terkemuka dan buntutan ruang kosong.

  `empty_value`
    New in Django 1.11.

    The value to use to represent "empty". Defaults to an empty string.

### `ChoiceField`

class `ChoiceField`(**kwargs)
  - Default widget: `Select`
  - Nilai kosong: `''` (sebuah deretan karakter kosong)
  - Normalizes to: A string.
  - Validates that the given value exists in the list of choices.
  - Error message keys: `required`, `invalid_choice`

  The `invalid_choice` error message may contain `%(value)s`, which will be replaced with the selected choice.

  Takes one extra argument:

  `choices`

    Either an iterable (e.g., a list or tuple) of 2-tuples to use as choices for this field, or a callable that returns such an iterable. This argument accepts the same formats as the `choices` argument to a model field. See the model field reference documentation on choices for more details. If the argument is a callable, it is evaluated each time the field's form is initialized. Defaults to an empty list.

### `TypedChoiceField`

class `TypedChoiceField`(**kwargs)

  Just like a `ChoiceField`, except `TypedChoiceField` takes two extra arguments, `coerce` and `empty_value`.

  - Default widget: `Select`
  - Empty value: Whatever you've given as `empty_value`.
  - Normalizes to: A value of the type provided by the `coerce` argument.
  - Validates that the given value exists in the list of choices and can be coerced.
  - Error message keys: `required`, `invalid_choice`

  Mengambil argumen tambahan:

  `coerce`

    A function that takes one argument and returns a coerced value. Examples include the built-in `int`, `float`, `bool` and other types. Defaults to an identity function. Note that coercion happens after input validation, so it is possible to coerce to a value not present in `choices`.

  `empty_value`

    The value to use to represent "empty." Defaults to the empty string; `None` is another common choice here. Note that this value will not be coerced by the function given in the `coerce` argument, so choose it accordingly.

### `DateField`

class `DateField`(**kwargs)
  - Widget awal: `DateInput`
  - Nilai kosong: `None`
  - Normalizes to: A Python `datetime.date` object.
  - Validates that the given value is either a `datetime.date`, `datetime.datetime` or string formatted in a particular date format.
  - Error message keys: `required`, `invalid`

  Takes one optional argument:

  `input_formats`

    A list of formats used to attempt to convert a string to a valid `datetime.date` object.

  If no `input_formats` argument is provided, the default input formats are:

      ['%Y-%m-%d',      # '2006-10-25'
       '%m/%d/%Y',      # '10/25/2006'
       '%m/%d/%y']      # '10/25/06'

  Additionally, if you specify `USE_L10N=False` in your settings, the following will also be included in the default input formats:

      ['%b %d %Y',      # 'Oct 25 2006'
       '%b %d, %Y',     # 'Oct 25, 2006'
       '%d %b %Y',      # '25 Oct 2006'
       '%d %b, %Y',     # '25 Oct, 2006'
       '%B %d %Y',      # 'October 25 2006'
       '%B %d, %Y',     # 'October 25, 2006'
       '%d %B %Y',      # '25 October 2006'
       '%d %B, %Y']     # '25 October, 2006'

  Lihat juga format localization.

### `DateTimeField`

class `DateTimeField`(**kwargs)
  - Widget awal: `DateTimeInput`
  - Nilai kosong: `None`
  - Normalizes to: A Python `datetime.datetime` object.
  - Validates that the given value is either a `datetime.datetime`, `datetime.date` or string formatted in a particular datetime format.
  - Error message keys: `required`, `invalid`

  Takes one optional argument:

  `input_formats`

    A list of formats used to attempt to convert a string to a valid `datetime.datetime` object.

  If no `input_formats` argument is provided, the default input formats are:

      ['%Y-%m-%d %H:%M:%S',    # '2006-10-25 14:30:59'
       '%Y-%m-%d %H:%M',       # '2006-10-25 14:30'
       '%Y-%m-%d',             # '2006-10-25'
       '%m/%d/%Y %H:%M:%S',    # '10/25/2006 14:30:59'
       '%m/%d/%Y %H:%M',       # '10/25/2006 14:30'
       '%m/%d/%Y',             # '10/25/2006'
       '%m/%d/%y %H:%M:%S',    # '10/25/06 14:30:59'
       '%m/%d/%y %H:%M',       # '10/25/06 14:30'
       '%m/%d/%y']             # '10/25/06'

  Lihat juga format localization.

### `DecimalField`

class `DecimalField`(**kwargs)
  - Default widget: `NumberInput` when `Field.localize` is `False`, else `TextInput`.
  - Nilai kosong: `None`
  - Normalizes to: A Python `decimal`.
  - Pengesahan yang nilai yang diberikan adalah desimal. Terkemuka dan buntutan ruang kosong diabaikan.
  - Error message keys: `required`, `invalid`, `max_value`, `min_value`, `max_digits`, `max_decimal_places`, `max_whole_digits`

  The `max_value` and `min_value` error messages may contain `%(limit_value)s`, which will be substituted by the appropriate limit. Similarly, the `max_digits`, `max_decimal_places` and `max_whole_digits` error messages may contain `%(max)s`.

  Mengambil empat argumen pilihan:

  `max_value`
  `min_value`

    Ini mengendalikan jangkauan nilai yang diizinkan dalam bidang, dan harus diberikan sebagai nilai `decimal.Decimal`.

  `max_digits`

    The maximum number of digits (those before the decimal point plus those after the decimal point, with leading zeros stripped) permitted in the value.

  `decimal_places`

    Angka maksimal dari tempat desimal yang diizinkan.

### `DurationField`

class `DurationField`(**kwargs)
  - Widget awal: `TextInput`
  - Nilai kosong: `None`
  - Normalizes to: A Python `timedelta`.
  - Validates that the given value is a string which can be converted into a `timedelta`.
  - Kunci pesan kesalahan: `required`, `invalid`.

  Accepts any format understood by `parse_duration()`.

### `EmailField`

class `EmailField`(**kwargs)
  - Widget awal: `EmailInput`
  - Nilai kosong: `''` (sebuah deretan karakter kosong)
  - Normalizes to: A string.
  - Validates that the given value is a valid email address, using a moderately complex regular expression.
  - Error message keys: `required`, `invalid`

  Has two optional arguments for validation, `max_length` and `min_length`. If provided, these arguments ensure that the string is at most or at least the given length.

### `FileField`

class `FileField`(**kwargs)
  - Widget awal: `ClearableFileInput`
  - Nilai kosong: `None`
  - Normalizes to: An `UploadedFile` object that wraps the file content and file name into a single object.
  - Can validate that non-empty file data has been bound to the form.
  - Kunci pesan kesalahan: `required`, `invalid`, `missing`, `empty`, `max_length`

  Has two optional arguments for validation, `max_length` and `allow_empty_file`. If provided, these ensure that the file name is at most the given length, and that validation will succeed even if the file content is empty.

  To learn more about the `UploadedFile` object, see the file uploads documentation.

  When you use a `FileField` in a form, you must also remember to bind the file data to the form.

  The `max_length` error refers to the length of the filename. In the error message for that key, `%(max)d` will be replaced with the maximum filename length and `%(length)d` will be replaced with the current filename length.

### `FilePathField`

class `FilePathField`(**kwargs)
  - Default widget: `Select`
  - Nilai kosong: `None`
  - Normalizes to: A string.
  - Validates that the selected choice exists in the list of choices.
  - Error message keys: `required`, `invalid_choice`

  The field allows choosing from files inside a certain directory. It takes five extra arguments; only `path` is required:

  `path`

    Jalur mutlak ke pelipat yang isinya anda ingin daftarkan. Pelipat harus ada.

  `recursive`

    If `False` (the default) only the direct contents of `path` will be offered as choices. If `True`, the directory will be descended into recursively and all descendants will be listed as choices.

  `match`

    A regular expression pattern; only files with names matching this expression will be allowed as choices.

  `allow_files`

    Optional. Either `True` or `False`. Default is `True`. Specifies whether files in the specified location should be included. Either this or `allow_folders` must be `True`.

  `allow_folders`

    Optional. Either `True` or `False`. Default is `False`. Specifies whether folders in the specified location should be included. Either this or `allow_files` must be `True`.

### `FloatField`

class `FloatField`(**kwargs)
  - Default widget: `NumberInput` when `Field.localize` is `False`, else `TextInput`.
  - Nilai kosong: `None`
  - Normalizes to: A Python float.
  - Pengesahan yang nilai diberikan adalah float. Terkemuka dan buntutan ruang kosong adalah diizinkan, seperti di fungsi `float()` Python.
  - Kunci pesan kesalahan: `required`, `invalid`, `max_value`, `min_value`

  Takes two optional arguments for validation, `max_value` and `min_value`. These control the range of values permitted in the field.

### `ImageField`

class `ImageField`(**kwargs)
  - Widget awal: `ClearableFileInput`
  - Nilai kosong: `None`
  - Normalizes to: An `UploadedFile` object that wraps the file content and file name into a single object.
  - Validates that file data has been bound to the form, and that the file is of an image format understood by Pillow.
  - Kunci pesan kesalahan: `required`, `invalid`, `missing`, `empty`, `invalid_image`

  Using an `ImageField` requires that Pillow is installed with support for the image formats you use. If you encounter a `corrupt image` error when you upload an image, it usually means that Pillow doesn't understand its format. To fix this, install the appropriate library and reinstall Pillow.

  When you use an `ImageField` on a form, you must also remember to bind the file data to the form.

  After the field has been cleaned and validated, the `UploadedFile` object will have an additional `image` attribute containing the Pillow Image instance used to check if the file was a valid image. Also, `UploadedFile.content_type` will be updated with the image's content type if Pillow can determine it, otherwise it will be set to `None`.

### `IntegerField`

class `IntegerField`(**kwargs)
  - Default widget: `NumberInput` when `Field.localize` is `False`, else `TextInput`.
  - Nilai kosong: `None`
  - Normalizes to: A Python integer.
  - Pengesahan yang nilai diberikan adalah integer. Terkemuka dan buntutan ruang kosong adalah diizinkan, seperti di fungsi `int()` Python.
  - Kunci pesan kesalahan: `required`, `invalid`, `max_value`, `min_value`

  The `max_value` and `min_value` error messages may contain `%(limit_value)s`, which will be substituted by the appropriate limit.

  Mengambil dua argumen pilihan untuk pengesahan:

  `max_value`
  `min_value`

  Ini mengendalikan jangkauan nilai yang diizinkan di bidang.

### `GenericIPAddressField`

class `GenericIPAddressField`(**kwargs)

  Bidang mengandung antara alamat IPv4 atau IPv6.

  - Widget awal: `TextInput`
  - Nilai kosong: `''` (sebuah deretan karakter kosong)
  - Normalizes to: A string. IPv6 addresses are normalized as described below.
  - Mensahkan bahwa nilai yang diberikan adalah alamat IP sah.
  - Error message keys: `required`, `invalid`

  The IPv6 address normalization follows RFC 4291#section-2.2 section 2.2, including using the IPv4 format suggested in paragraph 3 of that section, like `::ffff:192.0.2.0`. For example, `2001:0::0:01` would be normalized to `2001::1`, and `::ffff:0a0a:0a0a` to `::ffff:10.10.10.10`. All characters are converted to lowercase.

  Mengambil dua argumen pilihan:

  `protocol`

    Limits valid inputs to the specified protocol. Accepted values are `both` (default), `IPv4` or `IPv6`. Matching is case insensitive.

  `unpack_ipv4`

    Unpacks IPv4 mapped addresses like `::ffff:192.0.2.1`. If this option is enabled that address would be unpacked to `192.0.2.1`. Default is disabled. Can only be used when `protocol` is set to `'both'`.

### `MultipleChoiceField`

class `MultipleChoiceField`(**kwargs)
  - Widget awal: `SelectMultiple`
  - Nilai kosong: `[]` (sebuah deretan karakter kosong)
  - Normalizes to: A list of strings.
  - Mensahkan bahwa nilai di daftar yang diberikan dari nilai yang ada di daftar pilihan.
  - Kunci pesan kesalahan: `required`, `invalid`, `invalid_list`

  The `invalid_choice` error message may contain `%(value)s`, which will be replaced with the selected choice.

  Mengambil satu tambahan argumen wajib, `choices`, tentang `ChoiceField`.

### `TypedMultipleChoiceField`

class `TypedMultipleChoiceField`(**kwargs)

  Just like a `MultipleChoiceField`, except `TypedMultipleChoiceField` takes two extra arguments, `coerce` and `empty_value`.

  - Widget awal: `SelectMultiple`
  - Empty value: Whatever you've given as `empty_value`
  - Normalizes to: A list of values of the type provided by the `coerce` argument.
  - Validates that the given values exists in the list of choices and can be coerced.
  - Error message keys: `required`, `invalid_choice`

  The `invalid_choice` error message may contain `%(value)s`, which will be replaced with the selected choice.

  Takes two extra arguments, `coerce` and `empty_value`, as for `TypedChoiceField`.

### `NullBooleanField`

class `NullBooleanField`(**kwargs)
  - Widget awal: :class:``TypedMultipleChoiceField``
  - Nilai kosong: `None`
  - Normalizes to: A Python `True`, `False` or `None` value.
  - Validates nothing (i.e., it never raises a `ValidationError`).

### `RegexField`

class `RegexField`(**kwargs)
  - Widget awal: `TextInput`
  - Nilai kosong: `''` (sebuah deretan karakter kosong)
  - Normalizes to: A string.
  - Validates that the given value matches against a certain regular expression.
  - Error message keys: `required`, `invalid`

  Mengambil satu argumen diwajibkan:

  `regex`

    A regular expression specified either as a string or a compiled regular expression object.

  Also takes `max_length`, `min_length`, and `strip`, which work just as they do for `CharField`.

  `strip`

    Defaults to `False`. If enabled, stripping will be applied before the regex validation.

### `SlugField`

class `SlugField`(**kwargs)
  - Widget awal: `TextInput`
  - Nilai kosong: `''` (sebuah deretan karakter kosong)
  - Normalizes to: A string.
  - Validates that the given value contains only letters, numbers, underscores, and hyphens.
  - Pesan kesalahan: `required`, `invalid`.

  Bidang ini dimaksudkan untuk digunakan dalam mewakilkan model `SlugField` di formulir.

  Mengambil sebuah parameter pilihan:

  `allow_unicode`

    A boolean instructing the field to accept Unicode letters in addition to ASCII letters. Defaults to `False`.

### `TimeField`

class `TimeField`(**kwargs)
  - Widget awal: `TextInput`
  - Nilai kosong: `None`
  - Normalizes to: A Python `datetime.time` object.
  - Validates that the given value is either a `datetime.time` or string formatted in a particular time format.
  - Error message keys: `required`, `invalid`

  Takes one optional argument:

  `input_formats`

    A list of formats used to attempt to convert a string to a valid `datetime.time` object.

  If no `input_formats` argument is provided, the default input formats are:

      '%H:%M:%S',     # '14:30:59'
      '%H:%M',        # '14:30'

### `URLField`

class `URLField`(**kwargs)
  - Widget awal: `URLInput`
  - Nilai kosong: `''` (sebuah deretan karakter kosong)
  - Normalizes to: A string.
  - Mensahkan bahwa nilai yang diberikan adalah URL sah.
  - Error message keys: `required`, `invalid`

  Mengambil argumen pilihan berikut:

  `max_length`
  `min_length`

  Ini adalah sama seperti `CharField.max_length` dan `CharField.min_length`.

### `UUIDField`

class `UUIDField`(**kwargs)
  - Widget awal: `TextInput`
  - Nilai kosong: `''` (sebuah deretan karakter kosong)
  - Normalizes to: A `UUID` object.
  - Error message keys: `required`, `invalid`

  This field will accept any string format accepted as the `hex` argument to the `UUID` constructor.

## Slightly complex built-in `Field` classes

### `ComboField`

class `ComboField`(**kwargs)
  - Widget awal: `TextInput`
  - Nilai kosong: `''` (sebuah deretan karakter kosong)
  - Normalizes to: A string.
  - Validates the given value against each of the fields specified as an argument to the `ComboField`.
  - Error message keys: `required`, `invalid`

  Takes one extra required argument:

  `fields`

    The list of fields that should be used to validate the field's value (in the order in which they are provided).

        >>> from django.forms import ComboField
        >>> f = ComboField(fields=[CharField(max_length=20), EmailField()])
        >>> f.clean('test@example.com')
        'test@example.com'
        >>> f.clean('longemailaddress@example.com')
        Traceback (most recent call last):
        ...
        ValidationError: ['Ensure this value has at most 20 characters (it has 28).']

### `MultiValueField`

class `MultiValueField`(fields=(), **kwargs)
  - Widget awal: `TextInput`
  - Nilai kosong: `''` (sebuah deretan karakter kosong)
  - Normalizes to: the type returned by the `compress` method of the subclass.
  - Validates the given value against each of the fields specified as an argument to the `MultiValueField`.
  - Kunci pesan kesalahan: `required`, `invalid`, `incomplete`

  Aggregates the logic of multiple fields that together produce a single value.

  This field is abstract and must be subclassed. In contrast with the single-value fields, subclasses of `MultiValueField` must not implement `clean()` but instead - implement `compress()`.

  Takes one extra required argument:

  `fields`

    A tuple of fields whose values are cleaned and subsequently combined into a single value. Each value of the field is cleaned by the corresponding field in `fields` -- the first value is cleaned by the first field, the second value is cleaned by the second field, etc. Once all fields are cleaned, the list of clean values is combined into a single value by `compress()`.

  Also takes some optional arguments:

  `require_all_fields`

    Defaults to `True`, in which case a `required` validation error will be raised if no value is supplied for any field.

    When set to `False`, the `Field.required` attribute can be set to `False` for individual fields to make them optional. If no value is supplied for a required field, an `incomplete` validation error will be raised.

    A default `incomplete` error message can be defined on the `MultiValueField` subclass, or different messages can be defined on each individual field. For example:

        from django.core.validators import RegexValidator

        class PhoneField(MultiValueField):
            def __init__(self, **kwargs):
                # Define one message for all fields.
                error_messages = {
                    'incomplete': 'Enter a country calling code and a phone number.',
                }
                # Or define a different message for each field.
                fields = (
                    CharField(
                        error_messages={'incomplete': 'Enter a country calling code.'},
                        validators=[
                            RegexValidator(r'^[0-9]+$', 'Enter a valid country calling code.'),
                        ],
                    ),
                    CharField(
                        error_messages={'incomplete': 'Enter a phone number.'},
                        validators=[RegexValidator(r'^[0-9]+$', 'Enter a valid phone number.')],
                    ),
                    CharField(
                        validators=[RegexValidator(r'^[0-9]+$', 'Enter a valid extension.')],
                        required=False,
                    ),
                )
                super().__init__(
                    error_messages=error_messages, fields=fields,
                    require_all_fields=False, **kwargs
                )

  `widget`

    Must be a subclass of `django.forms.MultiWidget`. Default value is `TextInput`, which probably is not very useful in this case.

  `compress`(data_list)

    Takes a list of valid values and returns a "compressed" version of those values -- in a single value. For example, `SplitDateTimeField` is a subclass which combines a time field and a date field into a `datetime` object.

    Cara ini harus diterapkan di subkelas.

### `SplitDateTimeField`

class `SplitDateTimeField`(**kwargs)
  - Widget awal: `SplitDateTimeWidget`
  - Nilai kosong: `None`
  - Normalizes to: A Python `datetime.datetime` object.
  - Validates that the given value is a `datetime.datetime` or string formatted in a particular datetime format.
  - Kunci pesan kesalahan: `required`, `invalid`, `invalid_date`, `invalid_time`

  Mengambil dua argumen pilihan:

  `input_date_formats`

    A list of formats used to attempt to convert a string to a valid `datetime.date` object.

  If no `input_date_formats` argument is provided, the default input formats for `DateField` are used.

  `input_time_formats`

    A list of formats used to attempt to convert a string to a valid `datetime.time` object.

  If no `input_time_formats` argument is provided, the default input formats for `TimeField` are used.

## Fields which handle relationships

Two fields are available for representing relationships between models: `ModelChoiceField` and `ModelMultipleChoiceField`. Both of these fields require a single `queryset` parameter that is used to create the choices for the field. Upon form validation, these fields will place either one model object (in the case of `ModelChoiceField`) or multiple model objects (in the case of `ModelMultipleChoiceField`) into the `cleaned_data` dictionary of the form.

For more complex uses, you can specify `queryset=None` when declaring the form field and then populate the `queryset` in the form's `__init__()` method:

    class FooMultipleChoiceForm(forms.Form):
        foo_select = forms.ModelMultipleChoiceField(queryset=None)

        def __init__(self, *args, **kwargs):
            super().__init__(*args, **kwargs)
            self.fields['foo_select'].queryset = ...

### `ModelChoiceField`

class `ModelChoiceField`(**kwargs)
  - Default widget: `Select`
  - Nilai kosong: `None`
  - Normalizes to: A model instance.
  - Validates that the given id exists in the queryset.
  - Error message keys: `required`, `invalid_choice`

  Allows the selection of a single model object, suitable for representing a foreign key. Note that the default widget for `ModelChoiceField` becomes impractical when the number of entries increases. You should avoid using it for more than 100 items.

  Argumen tunggal dibutuhkan:

  `queryset`

    A `QuerySet` of model objects from which the choices for the field are derived and which is used to validate the user's selection. It's evaluated when the form is rendered.

  `ModelChoiceField` juga mengambil dua argumen pilihan:

  `empty_label`

    By default the `<select>` widget used by `ModelChoiceField` will have an empty choice at the top of the list. You can change the text of this label (which is `"---------"` by default) with the `empty_label` attribute, or you can disable the empty label entirely by setting `empty_label` to `None`:

        # A custom empty label
        field1 = forms.ModelChoiceField(queryset=..., empty_label="(Nothing)")

        # No empty label
        field2 = forms.ModelChoiceField(queryset=..., empty_label=None)

    Note that if a `ModelChoiceField` is required and has a default initial value, no empty choice is created (regardless of the value of `empty_label`).

  `to_field_name`

    This optional argument is used to specify the field to use as the value of the choices in the field's widget. Be sure it's a unique field for the model, otherwise the selected value could match more than one object. By default it is set to `None`, in which case the primary key of each object will be used. For example:

        # No custom to_field_name
        field1 = forms.ModelChoiceField(queryset=...)

    akan menghasilkan:

        <select id="id_field1" name="field1">
        <option value="obj1.pk">Object1</option>
        <option value="obj2.pk">Object2</option>
        ...
        </select>

    dan:

        # to_field_name provided
        field2 = forms.ModelChoiceField(queryset=..., to_field_name="name")

    akan menghasilkan:

        <select id="id_field2" name="field2">
        <option value="obj1.name">Object1</option>
        <option value="obj2.name">Object2</option>
        ...
        </select>

  The `__str__()` method of the model will be called to generate string representations of the objects for use in the field's choices. To provide customized representations, subclass `ModelChoiceField` and override `label_from_instance`. This method will receive a model object and should return a string suitable for representing it. For example:

      from django.forms import ModelChoiceField

      class MyModelChoiceField(ModelChoiceField):
          def label_from_instance(self, obj):
              return "My Object #%i" % obj.id

### `ModelMultipleChoiceField`

class `ModelMultipleChoiceField`(**kwargs)
  - Widget awal: `SelectMultiple`
  - Empty value: An empty `QuerySet` (self.queryset.none())
  - Normalizes to: A `QuerySet` of model instances.
  - Validates that every id in the given list of values exists in the queryset.
  - Error message keys: `required`, `list`, `invalid_choice`, `invalid_pk_value`

  The `invalid_choice` message may contain `%(value)s` and the `invalid_pk_value` message may contain `%(pk)s`, which will be substituted by the appropriate values.

  Allows the selection of one or more model objects, suitable for representing a many-to-many relation. As with `ModelChoiceField`, you can use `label_from_instance` to customize the object representations.

  Argumen tunggal dibutuhkan:

  `queryset`

    Sama seperti `ModelChoiceField.queryset`.

  Takes one optional argument:

  `to_field_name`

    Sama seperti `ModelChoiceField.to_field_name`.

## Membuat bidang penyesuaian

If the built-in `Field` classes don't meet your needs, you can easily create custom `Field` classes. To do this, just create a subclass of `django.forms.Field`. Its only requirements are that it implement a `clean()` method and that its `__init__()` method accept the core arguments mentioned above (`required`, `label`, `initial`, `widget`, `help_text`).

Anda dapat juga menyesuaikan bagaimana bidang akan diakses dengan menimpa `get_bound_field()`.