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API Formulir

Bound and unbound forms

A Form instance is either bound to a set of data, or unbound.

  • If it's bound to a set of data, it's capable of validating that data and rendering the form as HTML with the data displayed in the HTML.

  • If it's unbound, it cannot do validation (because there's no data to validate!), but it can still render the blank form as HTML.

class Form

To create an unbound Form instance, simply instantiate the class:

Code
>>> f = ContactForm()

To bind data to a form, pass the data as a dictionary as the first parameter to your Form class constructor:

Code
>>> data = {'subject': 'hello',
...         'message': 'Hi there',
...         'sender': 'foo@example.com',
...         'cc_myself': True}
>>> f = ContactForm(data)

In this dictionary, the keys are the field names, which correspond to the attributes in your Form class. The values are the data you're trying to validate. These will usually be strings, but there's no requirement that they be strings; the type of data you pass depends on the Field, as we'll see in a moment.

Form.is_bound

If you need to distinguish between bound and unbound form instances at runtime, check the value of the form's is_bound attribute:

Code
>>> f = ContactForm()
>>> f.is_bound
False
>>> f = ContactForm({'subject': 'hello'})
>>> f.is_bound
True

Note that passing an empty dictionary creates a bound form with empty data:

Code
>>> f = ContactForm({})
>>> f.is_bound
True

If you have a bound Form instance and want to change the data somehow, or if you want to bind an unbound Form instance to some data, create another Form instance. There is no way to change data in a Form instance. Once a Form instance has been created, you should consider its data immutable, whether it has data or not.

Menggunakan formulir untuk mensahkan data

Form.clean()

Implement a clean() method on your Form when you must add custom validation for fields that are interdependent. See Membersihkan dan memeriksa bidang yang tergantung satu sama lain for example usage.

Form.is_valid()

The primary task of a Form object is to validate data. With a bound Form instance, call the is_valid() method to run validation and return a boolean designating whether the data was valid:

Code
>>> data = {'subject': 'hello',
...         'message': 'Hi there',
...         'sender': 'foo@example.com',
...         'cc_myself': True}
>>> f = ContactForm(data)
>>> f.is_valid()
True

Let's try with some invalid data. In this case, subject is blank (an error, because all fields are required by default) and sender is not a valid email address:

Code
>>> data = {'subject': '',
...         'message': 'Hi there',
...         'sender': 'invalid email address',
...         'cc_myself': True}
>>> f = ContactForm(data)
>>> f.is_valid()
False
Form.errors

Mengakses atribut the errors untuk mendapatkan dictionary dari pesan kesalahan:

Code
>>> f.errors
{'sender': ['Enter a valid email address.'], 'subject': ['This field is required.']}

In this dictionary, the keys are the field names, and the values are lists of strings representing the error messages. The error messages are stored in lists because a field can have multiple error messages.

You can access errors without having to call is_valid() first. The form's data will be validated the first time either you call is_valid() or access errors.

The validation routines will only get called once, regardless of how many times you access errors or call is_valid(). This means that if validation has side effects, those side effects will only be triggered once.

Form.errors.as_data()

Returns a dict that maps fields to their original ValidationError instances.

Code
>>> f.errors.as_data()
{'sender': [ValidationError(['Enter a valid email address.'])],
'subject': [ValidationError(['This field is required.'])]}

Gunakan metode ini kapanpun anda butuh untuk mencirikan sebuah kesalahan berdasarkan code nya. Ini mengadakan hal-hal seperti menulis kembali pesan kesalahan atau menulis logika penyesuaian dalam sebuah tampilan ketika kesalahan diberikan hadir. Itu dapat juga digunakan untuk menserialkan kesalahan dalam bentuk penyesuaian (misalnya XML); sebagai contoh, as_json() bergantung pada as_data().

The need for the as_data() method is due to backwards compatibility. Previously ValidationError instances were lost as soon as their rendered error messages were added to the Form.errors dictionary. Ideally Form.errors would have stored ValidationError instances and methods with an as_ prefix could render them, but it had to be done the other way around in order not to break code that expects rendered error messages in Form.errors.

Form.errors.as_json(escape_html=False)

Mengembalikan kesalahan terserialisasi sebagai JSON.

Code
>>> f.errors.as_json()
{"sender": [{"message": "Enter a valid email address.", "code": "invalid"}],
"subject": [{"message": "This field is required.", "code": "required"}]}

By default, as_json() does not escape its output. If you are using it for something like AJAX requests to a form view where the client interprets the response and inserts errors into the page, you'll want to be sure to escape the results on the client-side to avoid the possibility of a cross-site scripting attack. It's trivial to do so using a JavaScript library like jQuery - simply use $(el).text(errorText) rather than .html().

If for some reason you don't want to use client-side escaping, you can also set escape_html=True and error messages will be escaped so you can use them directly in HTML.

Form.errors.get_json_data(escape_html=False)

Returns the errors as a dictionary suitable for serializing to JSON. Form.errors.as_json() returns serialized JSON, while this returns the error data before it's serialized.

The escape_html parameter behaves as described in Form.errors.as_json().

Form.add_error(field, error)

This method allows adding errors to specific fields from within the Form.clean() method, or from outside the form altogether; for instance from a view.

The field argument is the name of the field to which the errors should be added. If its value is None the error will be treated as a non-field error as returned by Form.non_field_errors().

The error argument can be a simple string, or preferably an instance of ValidationError. See Membangkitkan ValidationError for best practices when defining form errors.

Catat bahwa Form.add_error() otomatis memindahkan bidang terkait dari cleaned_data.

Form.has_error(field, code=None)

This method returns a boolean designating whether a field has an error with a specific error code. If code is None, it will return True if the field contains any errors at all.

To check for non-field errors use NON_FIELD_ERRORS as the field parameter.

Form.non_field_errors()

This method returns the list of errors from Form.errors that aren't associated with a particular field. This includes ValidationErrors that are raised in Form.clean() and errors added using Form.add_error(None, "...").

Perilaku dari formulir tidak terikat

Itu adalah tidak ada guna mensahkan sebuah formulir tanpa data, untuk rekaman, ini adalah apa yang akan terjadi dengan formulir tidak terikat:

Code
>>> f = ContactForm()
>>> f.is_valid()
False
>>> f.errors
{}

Awalan nilai-nilai dinamis

Form.initial

Use initial to declare the initial value of form fields at runtime. For example, you might want to fill in a username field with the username of the current session.

Untuk memenuhi ini, gunakan argumen initial pada Form. Argumen ini, jika diberikan, harus berupa bidang pemetaan dictionary hanya nilai inisial. Hanya sertakan bidang-bidang dimana anda menentukan nilai inisial; itu tidak perlu menyertakan setiap bidang dalam formulir anda. Sebagai contoh:

Code
>>> f = ContactForm(initial={'subject': 'Hi there!'})

These values are only displayed for unbound forms, and they're not used as fallback values if a particular value isn't provided.

If a Field defines initial and you include initial when instantiating the Form, then the latter initial will have precedence. In this example, initial is provided both at the field level and at the form instance level, and the latter gets precedence:

Code
>>> from django import forms
>>> class CommentForm(forms.Form):
...     name = forms.CharField(initial='class')
...     url = forms.URLField()
...     comment = forms.CharField()
>>> f = CommentForm(initial={'name': 'instance'}, auto_id=False)
>>> print(f)
<tr><th>Name:</th><td><input type="text" name="name" value="instance" required></td></tr>
<tr><th>Url:</th><td><input type="url" name="url" required></td></tr>
<tr><th>Comment:</th><td><input type="text" name="comment" required></td></tr>
Form.get_initial_for_field(field, field_name)

Use get_initial_for_field() to retrieve initial data for a form field. It retrieves data from Form.initial and Field.initial, in that order, and evaluates any callable initial values.

Memeriksa data formulir mana yang telah berubah

Form.has_changed()

Gunakan metode has_changed() pada Form anda ketika anda butuh memeriksa jika data formulir telah berubah dari data awal.

Code
>>> data = {'subject': 'hello',
...         'message': 'Hi there',
...         'sender': 'foo@example.com',
...         'cc_myself': True}
>>> f = ContactForm(data, initial=data)
>>> f.has_changed()
False

When the form is submitted, we reconstruct it and provide the original data so that the comparison can be done:

Code
>>> f = ContactForm(request.POST, initial=data)
>>> f.has_changed()

has_changed() will be True if the data from request.POST differs from what was provided in initial or False otherwise. The result is computed by calling Field.has_changed() for each field in the form.

Form.changed_data

The changed_data attribute returns a list of the names of the fields whose values in the form's bound data (usually request.POST) differ from what was provided in initial. It returns an empty list if no data differs.

Code
>>> f = ContactForm(request.POST, initial=data)
>>> if f.has_changed():
...     print("The following fields changed: %s" % ", ".join(f.changed_data))

Mengakses bidang-bidang dari formulir

Form.fields

Anda dapat mengakses bidang dari instance Form dari atribut fields nya:

Code
>>> for row in f.fields.values(): print(row)
...
<django.forms.fields.CharField object at 0x7ffaac632510>
<django.forms.fields.URLField object at 0x7ffaac632f90>
<django.forms.fields.CharField object at 0x7ffaac3aa050>
>>> f.fields['name']
<django.forms.fields.CharField object at 0x7ffaac6324d0>

Anda dapat merubah instance Form untuk merubah cara itu dihadirkan dalam formulir:

Code
>>> f.as_table().split('\n')[0]
'<tr><th>Name:</th><td><input name="name" type="text" value="instance" required></td></tr>'
>>> f.fields['name'].label = "Username"
>>> f.as_table().split('\n')[0]
'<tr><th>Username:</th><td><input name="name" type="text" value="instance" required></td></tr>'

Beware not to alter the base_fields attribute because this modification will influence all subsequent ContactForm instances within the same Python process:

Code
>>> f.base_fields['name'].label = "Username"
>>> another_f = CommentForm(auto_id=False)
>>> another_f.as_table().split('\n')[0]
'<tr><th>Username:</th><td><input name="name" type="text" value="class" required></td></tr>'

Mengakses data "clean"

Form.cleaned_data

Each field in a Form class is responsible not only for validating data, but also for "cleaning" it -- normalizing it to a consistent format. This is a nice feature, because it allows data for a particular field to be input in a variety of ways, always resulting in consistent output.

For example, DateField normalizes input into a Python datetime.date object. Regardless of whether you pass it a string in the format '1994-07-15', a datetime.date object, or a number of other formats, DateField will always normalize it to a datetime.date object as long as it's valid.

Sekali anda telah membuat sebuah contoh Form dengan himpunan dari data dan mensahkan itu, anda dapat mengakses data bersih melalui atribut cleaned_data nya:

Code
>>> data = {'subject': 'hello',
...         'message': 'Hi there',
...         'sender': 'foo@example.com',
...         'cc_myself': True}
>>> f = ContactForm(data)
>>> f.is_valid()
True
>>> f.cleaned_data
{'cc_myself': True, 'message': 'Hi there', 'sender': 'foo@example.com', 'subject': 'hello'}

Note that any text-based field -- such as CharField or EmailField -- always cleans the input into a string. We'll cover the encoding implications later in this document.

Jika data anda tidak disahkan, dictionary cleaned_data mengandung hanya bidang sah:

Code
>>> data = {'subject': '',
...         'message': 'Hi there',
...         'sender': 'invalid email address',
...         'cc_myself': True}
>>> f = ContactForm(data)
>>> f.is_valid()
False
>>> f.cleaned_data
{'cc_myself': True, 'message': 'Hi there'}

cleaned_data will always only contain a key for fields defined in the Form, even if you pass extra data when you define the Form. In this example, we pass a bunch of extra fields to the ContactForm constructor, but cleaned_data contains only the form's fields:

Code
>>> data = {'subject': 'hello',
...         'message': 'Hi there',
...         'sender': 'foo@example.com',
...         'cc_myself': True,
...         'extra_field_1': 'foo',
...         'extra_field_2': 'bar',
...         'extra_field_3': 'baz'}
>>> f = ContactForm(data)
>>> f.is_valid()
True
>>> f.cleaned_data # Doesn't contain extra_field_1, etc.
{'cc_myself': True, 'message': 'Hi there', 'sender': 'foo@example.com', 'subject': 'hello'}

When the Form is valid, cleaned_data will include a key and value for all its fields, even if the data didn't include a value for some optional fields. In this example, the data dictionary doesn't include a value for the nick_name field, but cleaned_data includes it, with an empty value:

Code
>>> from django import forms
>>> class OptionalPersonForm(forms.Form):
...     first_name = forms.CharField()
...     last_name = forms.CharField()
...     nick_name = forms.CharField(required=False)
>>> data = {'first_name': 'John', 'last_name': 'Lennon'}
>>> f = OptionalPersonForm(data)
>>> f.is_valid()
True
>>> f.cleaned_data
{'nick_name': '', 'first_name': 'John', 'last_name': 'Lennon'}

Dalam contoh diatas ini, nilai cleaned_data untuk nick_name disetel menjadi string kosong, karena nick_name adalah CharField, dan CharField memperlakukan nilai kosong sebagai sebuah string kosong. Setiap jenis bidang mengenal nilai "blank" nya -- misalnya, untuk DateField, itu adalah None daripada string kosong. Untuk rincian penuh pada setiap perilaku bidang dalam kasus ini, lihat catatan "Empty value" untuk setiap bidang dalam bagian "Built-in Field classes" dibawah.

You can write code to perform validation for particular form fields (based on their name) or for the form as a whole (considering combinations of various fields). More information about this is in Pengesahan formulir dan bidang.

Mengeluarkan formulir sebagai HTML

Tugas kedua dari obyek Form adalah membangun itu sendiri sebagai HTML. Untuk melakukannya, cukup print itu:

Code
>>> f = ContactForm()
>>> print(f)
<tr><th><label for="id_subject">Subject:</label></th><td><input id="id_subject" type="text" name="subject" maxlength="100" required></td></tr>
<tr><th><label for="id_message">Message:</label></th><td><input type="text" name="message" id="id_message" required></td></tr>
<tr><th><label for="id_sender">Sender:</label></th><td><input type="email" name="sender" id="id_sender" required></td></tr>
<tr><th><label for="id_cc_myself">Cc myself:</label></th><td><input type="checkbox" name="cc_myself" id="id_cc_myself"></td></tr>

If the form is bound to data, the HTML output will include that data appropriately. For example, if a field is represented by an <input type="text">, the data will be in the value attribute. If a field is represented by an <input type="checkbox">, then that HTML will include checked if appropriate:

Code
>>> data = {'subject': 'hello',
...         'message': 'Hi there',
...         'sender': 'foo@example.com',
...         'cc_myself': True}
>>> f = ContactForm(data)
>>> print(f)
<tr><th><label for="id_subject">Subject:</label></th><td><input id="id_subject" type="text" name="subject" maxlength="100" value="hello" required></td></tr>
<tr><th><label for="id_message">Message:</label></th><td><input type="text" name="message" id="id_message" value="Hi there" required></td></tr>
<tr><th><label for="id_sender">Sender:</label></th><td><input type="email" name="sender" id="id_sender" value="foo@example.com" required></td></tr>
<tr><th><label for="id_cc_myself">Cc myself:</label></th><td><input type="checkbox" name="cc_myself" id="id_cc_myself" checked></td></tr>

Keluaran awalan adalah tabel HTML dua-kolom, dengan <tr> untuk setiap bidang Perhatikan berikut:

  • Untuk keluwesan, keluaran tidak menyertakan etiket <table> dan </table>, tidak juga itu menyertakan etiket <form> dan </form> atau sebuah etiket <input type="submit">. Itu adalah pekerjaan anda melakukan itu.

  • Each field type has a default HTML representation. CharField is represented by an <input type="text"> and EmailField by an <input type="email">. BooleanField is represented by an <input type="checkbox">. Note these are merely sensible defaults; you can specify which HTML to use for a given field by using widgets, which we'll explain shortly.

  • name HTML untuk setiap etiket diambil langsung dari nama atributnya dalam kelas ContactForm.

  • label teks untuk setiap bidang -- misalnya 'Subject:', 'Message:' dan 'Cc myself:' dibangkitkan dari nama bidang dengan merubah semua garis bawah menjadi ruang dan menghuruf besarkan huruf pertama. Lagi, catat ini adalah awalan masuk akal; anda dapat juga menentukan label secara manual.

  • Each text label is surrounded in an HTML <label> tag, which points to the appropriate form field via its id. Its id, in turn, is generated by prepending 'id_' to the field name. The id attributes and <label> tags are included in the output by default, to follow best practices, but you can change that behavior.

  • Keluaran menggunakan sintaksis HTML5, menyasar <!DOCTYPE html>. Sebagai contoh, itu menggunakan atribut boolean seperti checked daripada gaya XHTML dari checked='checked'.

Although <table> output is the default output style when you print a form, other output styles are available. Each style is available as a method on a form object, and each rendering method returns a string.

as_p()

Form.as_p()

as_p() membangun formulir sebagai rangkaian dari etiket <p>, dimana setiap <p> mengandung satu bidang:

Code
>>> f = ContactForm()
>>> f.as_p()
'<p><label for="id_subject">Subject:</label> <input id="id_subject" type="text" name="subject" maxlength="100" required></p>\n<p><label for="id_message">Message:</label> <input type="text" name="message" id="id_message" required></p>\n<p><label for="id_sender">Sender:</label> <input type="text" name="sender" id="id_sender" required></p>\n<p><label for="id_cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="id_cc_myself"></p>'
>>> print(f.as_p())
<p><label for="id_subject">Subject:</label> <input id="id_subject" type="text" name="subject" maxlength="100" required></p>
<p><label for="id_message">Message:</label> <input type="text" name="message" id="id_message" required></p>
<p><label for="id_sender">Sender:</label> <input type="email" name="sender" id="id_sender" required></p>
<p><label for="id_cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="id_cc_myself"></p>

as_ul()

Form.as_ul()

as_ul() membangun formulir sebagai rangkaian dari etiket <li>, dengan setiap <li> mengandung satu bidang. Itu tidak menyertakan <ul> atau </ul>, sehingga anda dapat menentukan atribut HTML apapun pada <ul> untuk keluwesan:

Code
>>> f = ContactForm()
>>> f.as_ul()
'<li><label for="id_subject">Subject:</label> <input id="id_subject" type="text" name="subject" maxlength="100" required></li>\n<li><label for="id_message">Message:</label> <input type="text" name="message" id="id_message" required></li>\n<li><label for="id_sender">Sender:</label> <input type="email" name="sender" id="id_sender" required></li>\n<li><label for="id_cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="id_cc_myself"></li>'
>>> print(f.as_ul())
<li><label for="id_subject">Subject:</label> <input id="id_subject" type="text" name="subject" maxlength="100" required></li>
<li><label for="id_message">Message:</label> <input type="text" name="message" id="id_message" required></li>
<li><label for="id_sender">Sender:</label> <input type="email" name="sender" id="id_sender" required></li>
<li><label for="id_cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="id_cc_myself"></li>

as_table()

Form.as_table()

Finally, as_table() outputs the form as an HTML <table>. This is exactly the same as print. In fact, when you print a form object, it calls its as_table() method behind the scenes:

Code
>>> f = ContactForm()
>>> f.as_table()
'<tr><th><label for="id_subject">Subject:</label></th><td><input id="id_subject" type="text" name="subject" maxlength="100" required></td></tr>\n<tr><th><label for="id_message">Message:</label></th><td><input type="text" name="message" id="id_message" required></td></tr>\n<tr><th><label for="id_sender">Sender:</label></th><td><input type="email" name="sender" id="id_sender" required></td></tr>\n<tr><th><label for="id_cc_myself">Cc myself:</label></th><td><input type="checkbox" name="cc_myself" id="id_cc_myself"></td></tr>'
>>> print(f)
<tr><th><label for="id_subject">Subject:</label></th><td><input id="id_subject" type="text" name="subject" maxlength="100" required></td></tr>
<tr><th><label for="id_message">Message:</label></th><td><input type="text" name="message" id="id_message" required></td></tr>
<tr><th><label for="id_sender">Sender:</label></th><td><input type="email" name="sender" id="id_sender" required></td></tr>
<tr><th><label for="id_cc_myself">Cc myself:</label></th><td><input type="checkbox" name="cc_myself" id="id_cc_myself"></td></tr>

Penggayaan dibutuhkan atau kekeliruan baris formulir

Form.error_css_class
Form.required_css_class

It's pretty common to style form rows and fields that are required or have errors. For example, you might want to present required form rows in bold and highlight errors in red.

The Form class has a couple of hooks you can use to add class attributes to required rows or to rows with errors: simply set the Form.error_css_class and/or Form.required_css_class attributes:

Code
from django import forms

class ContactForm(forms.Form):
    error_css_class = 'error'
    required_css_class = 'required'

    # ... and the rest of your fields here

Once you've done that, rows will be given "error" and/or "required" classes, as needed. The HTML will look something like:

Code
>>> f = ContactForm(data)
>>> print(f.as_table())
<tr class="required"><th><label class="required" for="id_subject">Subject:</label>    ...
<tr class="required"><th><label class="required" for="id_message">Message:</label>    ...
<tr class="required error"><th><label class="required" for="id_sender">Sender:</label>      ...
<tr><th><label for="id_cc_myself">Cc myself:<label> ...
>>> f['subject'].label_tag()
<label class="required" for="id_subject">Subject:</label>
>>> f['subject'].label_tag(attrs={'class': 'foo'})
<label for="id_subject" class="foo required">Subject:</label>

Menkonfigurasi unsur-unsur formulir HTML atribut id dan etiket <label>

Form.auto_id

Secara awalan, formulir membangun metode-metode termasuk:

  • Atribut ``id``HTML pada unsur-unser formulir.

  • The corresponding <label> tags around the labels. An HTML <label> tag designates which label text is associated with which form element. This small enhancement makes forms more usable and more accessible to assistive devices. It's always a good idea to use <label> tags.

The id attribute values are generated by prepending id_ to the form field names. This behavior is configurable, though, if you want to change the id convention or remove HTML id attributes and <label> tags entirely.

Use the auto_id argument to the Form constructor to control the id and label behavior. This argument must be True, False or a string.

If auto_id is False, then the form output will not include <label> tags nor id attributes:

Code
>>> f = ContactForm(auto_id=False)
>>> print(f.as_table())
<tr><th>Subject:</th><td><input type="text" name="subject" maxlength="100" required></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></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></li>
<li>Message: <input type="text" name="message" required></li>
<li>Sender: <input type="email" name="sender" required></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></p>
<p>Message: <input type="text" name="message" required></p>
<p>Sender: <input type="email" name="sender" required></p>
<p>Cc myself: <input type="checkbox" name="cc_myself"></p>

If auto_id is set to True, then the form output will include <label> tags and will simply use the field name as its id for each form field:

Code
>>> f = ContactForm(auto_id=True)
>>> print(f.as_table())
<tr><th><label for="subject">Subject:</label></th><td><input id="subject" type="text" name="subject" maxlength="100" required></td></tr>
<tr><th><label for="message">Message:</label></th><td><input type="text" name="message" id="message" required></td></tr>
<tr><th><label for="sender">Sender:</label></th><td><input type="email" name="sender" id="sender" required></td></tr>
<tr><th><label for="cc_myself">Cc myself:</label></th><td><input type="checkbox" name="cc_myself" id="cc_myself"></td></tr>
>>> print(f.as_ul())
<li><label for="subject">Subject:</label> <input id="subject" type="text" name="subject" maxlength="100" required></li>
<li><label for="message">Message:</label> <input type="text" name="message" id="message" required></li>
<li><label for="sender">Sender:</label> <input type="email" name="sender" id="sender" required></li>
<li><label for="cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="cc_myself"></li>
>>> print(f.as_p())
<p><label for="subject">Subject:</label> <input id="subject" type="text" name="subject" maxlength="100" required></p>
<p><label for="message">Message:</label> <input type="text" name="message" id="message" required></p>
<p><label for="sender">Sender:</label> <input type="email" name="sender" id="sender" required></p>
<p><label for="cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="cc_myself"></p>

If auto_id is set to a string containing the format character '%s', then the form output will include <label> tags, and will generate id attributes based on the format string. For example, for a format string 'field_%s', a field named subject will get the id value 'field_subject'. Continuing our example:

Code
>>> f = ContactForm(auto_id='id_for_%s')
>>> print(f.as_table())
<tr><th><label for="id_for_subject">Subject:</label></th><td><input id="id_for_subject" type="text" name="subject" maxlength="100" required></td></tr>
<tr><th><label for="id_for_message">Message:</label></th><td><input type="text" name="message" id="id_for_message" required></td></tr>
<tr><th><label for="id_for_sender">Sender:</label></th><td><input type="email" name="sender" id="id_for_sender" required></td></tr>
<tr><th><label for="id_for_cc_myself">Cc myself:</label></th><td><input type="checkbox" name="cc_myself" id="id_for_cc_myself"></td></tr>
>>> print(f.as_ul())
<li><label for="id_for_subject">Subject:</label> <input id="id_for_subject" type="text" name="subject" maxlength="100" required></li>
<li><label for="id_for_message">Message:</label> <input type="text" name="message" id="id_for_message" required></li>
<li><label for="id_for_sender">Sender:</label> <input type="email" name="sender" id="id_for_sender" required></li>
<li><label for="id_for_cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="id_for_cc_myself"></li>
>>> print(f.as_p())
<p><label for="id_for_subject">Subject:</label> <input id="id_for_subject" type="text" name="subject" maxlength="100" required></p>
<p><label for="id_for_message">Message:</label> <input type="text" name="message" id="id_for_message" required></p>
<p><label for="id_for_sender">Sender:</label> <input type="email" name="sender" id="id_for_sender" required></p>
<p><label for="id_for_cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="id_for_cc_myself"></p>

If auto_id is set to any other true value -- such as a string that doesn't include %s -- then the library will act as if auto_id is True.

Secara awalan, auto_id disetel menjadi string 'id_%s'.

Form.label_suffix

A translatable string (defaults to a colon (:) in English) that will be appended after any label name when a form is rendered.

It's possible to customize that character, or omit it entirely, using the label_suffix parameter:

Code
>>> f = ContactForm(auto_id='id_for_%s', label_suffix='')
>>> print(f.as_ul())
<li><label for="id_for_subject">Subject</label> <input id="id_for_subject" type="text" name="subject" maxlength="100" required></li>
<li><label for="id_for_message">Message</label> <input type="text" name="message" id="id_for_message" required></li>
<li><label for="id_for_sender">Sender</label> <input type="email" name="sender" id="id_for_sender" required></li>
<li><label for="id_for_cc_myself">Cc myself</label> <input type="checkbox" name="cc_myself" id="id_for_cc_myself"></li>
>>> f = ContactForm(auto_id='id_for_%s', label_suffix=' ->')
>>> print(f.as_ul())
<li><label for="id_for_subject">Subject -></label> <input id="id_for_subject" type="text" name="subject" maxlength="100" required></li>
<li><label for="id_for_message">Message -></label> <input type="text" name="message" id="id_for_message" required></li>
<li><label for="id_for_sender">Sender -></label> <input type="email" name="sender" id="id_for_sender" required></li>
<li><label for="id_for_cc_myself">Cc myself -></label> <input type="checkbox" name="cc_myself" id="id_for_cc_myself"></li>

Note that the label suffix is added only if the last character of the label isn't a punctuation character (in English, those are ., !, ? or :).

Fields can also define their own label_suffix. This will take precedence over Form.label_suffix. The suffix can also be overridden at runtime using the label_suffix parameter to label_tag().

Form.use_required_attribute

When set to True (the default), required form fields will have the required HTML attribute.

Formsets instantiate forms with use_required_attribute=False to avoid incorrect browser validation when adding and deleting forms from a formset.

Configuring the rendering of a form's widgets

Form.default_renderer

Specifies the renderer to use for the form. Defaults to None which means to use the default renderer specified by the FORM_RENDERER setting.

You can set this as a class attribute when declaring your form or use the renderer argument to Form.__init__(). For example:

Code
from django import forms

class MyForm(forms.Form):
    default_renderer = MyRenderer()

atau:

Code
form = MyForm(renderer=MyRenderer())

Catatan pada pengurutan bidang

In the as_p(), as_ul() and as_table() shortcuts, the fields are displayed in the order in which you define them in your form class. For example, in the ContactForm example, the fields are defined in the order subject, message, sender, cc_myself. To reorder the HTML output, just change the order in which those fields are listed in the class.

Ada beberapa cara lain untuk menyesuaikan urutan:

Form.field_order

By default Form.field_order=None, which retains the order in which you define the fields in your form class. If field_order is a list of field names, the fields are ordered as specified by the list and remaining fields are appended according to the default order. Unknown field names in the list are ignored. This makes it possible to disable a field in a subclass by setting it to None without having to redefine ordering.

You can also use the Form.field_order argument to a Form to override the field order. If a Form defines field_order and you include field_order when instantiating the Form, then the latter field_order will have precedence.

Form.order_fields(field_order)

You may rearrange the fields any time using order_fields() with a list of field names as in field_order.

Bagaimana kesalahan-kesalahan ditampilkan

If you render a bound Form object, the act of rendering will automatically run the form's validation if it hasn't already happened, and the HTML output will include the validation errors as a <ul class="errorlist"> near the field. The particular positioning of the error messages depends on the output method you're using:

Code
>>> data = {'subject': '',
...         'message': 'Hi there',
...         'sender': 'invalid email address',
...         'cc_myself': True}
>>> f = ContactForm(data, auto_id=False)
>>> print(f.as_table())
<tr><th>Subject:</th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="text" name="subject" maxlength="100" required></td></tr>
<tr><th>Message:</th><td><input type="text" name="message" value="Hi there" required></td></tr>
<tr><th>Sender:</th><td><ul class="errorlist"><li>Enter a valid email address.</li></ul><input type="email" name="sender" value="invalid email address" required></td></tr>
<tr><th>Cc myself:</th><td><input checked type="checkbox" name="cc_myself"></td></tr>
>>> print(f.as_ul())
<li><ul class="errorlist"><li>This field is required.</li></ul>Subject: <input type="text" name="subject" maxlength="100" required></li>
<li>Message: <input type="text" name="message" value="Hi there" required></li>
<li><ul class="errorlist"><li>Enter a valid email address.</li></ul>Sender: <input type="email" name="sender" value="invalid email address" required></li>
<li>Cc myself: <input checked type="checkbox" name="cc_myself"></li>
>>> print(f.as_p())
<p><ul class="errorlist"><li>This field is required.</li></ul></p>
<p>Subject: <input type="text" name="subject" maxlength="100" required></p>
<p>Message: <input type="text" name="message" value="Hi there" required></p>
<p><ul class="errorlist"><li>Enter a valid email address.</li></ul></p>
<p>Sender: <input type="email" name="sender" value="invalid email address" required></p>
<p>Cc myself: <input checked type="checkbox" name="cc_myself"></p>

Menyesuaikan bentuk daftar kesalahan

By default, forms use django.forms.utils.ErrorList to format validation errors. If you'd like to use an alternate class for displaying errors, you can pass that in at construction time:

Code
>>> from django.forms.utils import ErrorList
>>> class DivErrorList(ErrorList):
...     def __str__(self):
...         return self.as_divs()
...     def as_divs(self):
...         if not self: return ''
...         return '<div class="errorlist">%s</div>' % ''.join(['<div class="error">%s</div>' % e for e in self])
>>> f = ContactForm(data, auto_id=False, error_class=DivErrorList)
>>> f.as_p()
<div class="errorlist"><div class="error">This field is required.</div></div>
<p>Subject: <input type="text" name="subject" maxlength="100" required></p>
<p>Message: <input type="text" name="message" value="Hi there" required></p>
<div class="errorlist"><div class="error">Enter a valid email address.</div></div>
<p>Sender: <input type="email" name="sender" value="invalid email address" required></p>
<p>Cc myself: <input checked type="checkbox" name="cc_myself"></p>

More granular output

The as_p(), as_ul(), and as_table() methods are simply shortcuts -- they're not the only way a form object can be displayed.

class BoundField

Digunakan untuk menampilkan HTML atau mengakses atribut untuk bidang tunggal dari instance Form.

Metode __str__() dari obyek ini menampilkan HTML unutk bidang ini.

To retrieve a single BoundField, use dictionary lookup syntax on your form using the field's name as the key:

Code
>>> form = ContactForm()
>>> print(form['subject'])
<input id="id_subject" type="text" name="subject" maxlength="100" required>

Untuk mengambil semua obyek BoundField, ulangi formulir:

Code
>>> form = ContactForm()
>>> for boundfield in form: print(boundfield)
<input id="id_subject" type="text" name="subject" maxlength="100" required>
<input type="text" name="message" id="id_message" required>
<input type="email" name="sender" id="id_sender" required>
<input type="checkbox" name="cc_myself" id="id_cc_myself">

The field-specific output honors the form object's auto_id setting:

Code
>>> f = ContactForm(auto_id=False)
>>> print(f['message'])
<input type="text" name="message" required>
>>> f = ContactForm(auto_id='id_%s')
>>> print(f['message'])
<input type="text" name="message" id="id_message" required>

Atribut dari BoundField

BoundField.auto_id

The HTML ID attribute for this BoundField. Returns an empty string if Form.auto_id is False.

BoundField.data

This property returns the data for this BoundField extracted by the widget's value_from_datadict() method, or None if it wasn't given:

Code
>>> unbound_form = ContactForm()
>>> print(unbound_form['subject'].data)
None
>>> bound_form = ContactForm(data={'subject': 'My Subject'})
>>> print(bound_form['subject'].data)
My Subject
BoundField.errors

A list-like object that is displayed as an HTML <ul class="errorlist"> when printed:

Code
>>> data = {'subject': 'hi', 'message': '', 'sender': '', 'cc_myself': ''}
>>> f = ContactForm(data, auto_id=False)
>>> print(f['message'])
<input type="text" name="message" required>
>>> f['message'].errors
['This field is required.']
>>> print(f['message'].errors)
<ul class="errorlist"><li>This field is required.</li></ul>
>>> f['subject'].errors
[]
>>> print(f['subject'].errors)

>>> str(f['subject'].errors)
''
BoundField.field

The form Field instance from the form class that this BoundField wraps.

BoundField.form

The Form instance this BoundField is bound to.

BoundField.help_text

help_text dari bidang.

BoundField.html_name

The name that will be used in the widget's HTML name attribute. It takes the form prefix into account.

BoundField.id_for_label

Use this property to render the ID of this field. For example, if you are manually constructing a <label> in your template (despite the fact that label_tag() will do this for you):

Django template
<label for="{{ form.my_field.id_for_label }}">...</label>{{ my_field }}

By default, this will be the field's name prefixed by id_ ("id_my_field" for the example above). You may modify the ID by setting attrs on the field's widget. For example, declaring a field like this:

Code
my_field = forms.CharField(widget=forms.TextInput(attrs={'id': 'myFIELD'}))

dan menggunakan cetakan diatas, akan membangun sesuatu seperti:

Html
<label for="myFIELD">...</label><input id="myFIELD" type="text" name="my_field" required>
BoundField.is_hidden

Mengembalikan True jika widget ini BoundField' sembunyi.

BoundField.label

label dari bidang. Ini digunakan dalam label_tag().

BoundField.name

Nama dari bidang ini di formulir:

Code
>>> f = ContactForm()
>>> print(f['subject'].name)
subject
>>> print(f['message'].name)
message

Cara dari BoundField

BoundField.as_hidden(attrs=None, **kwargs)

Mengembalikan deretan karakter HTML untuk mewakilkan ini sebagai sebuah <input type="hidden">.

**kwargs diloloskan ke as_widget().

Cara ini terutama digunakan secara internal. Anda harus menggunakan widget sebagai gantinya.

BoundField.as_widget(widget=None, attrs=None, only_initial=False)

Renders the field by rendering the passed widget, adding any HTML attributes passed as attrs. If no widget is specified, then the field's default widget will be used.

only_initial is used by Django internals and should not be set explicitly.

BoundField.css_classes()

When you use Django's rendering shortcuts, CSS classes are used to indicate required form fields or fields that contain errors. If you're manually rendering a form, you can access these CSS classes using the css_classes method:

Code
>>> f = ContactForm(data={'message': ''})
>>> f['message'].css_classes()
'required'

If you want to provide some additional classes in addition to the error and required classes that may be required, you can provide those classes as an argument:

Code
>>> f = ContactForm(data={'message': ''})
>>> f['message'].css_classes('foo bar')
'foo bar required'
BoundField.label_tag(contents=None, attrs=None, label_suffix=None)

Untuk secara terpisah membangun etiket label dari bidang formulir, anda dapat memanggil cara label_tag() nya:

Code
>>> f = ContactForm(data={'message': ''})
>>> print(f['message'].label_tag())
<label for="id_message">Message:</label>

You can provide the contents parameter which will replace the auto-generated label tag. An attrs dictionary may contain additional attributes for the <label> tag.

The HTML that's generated includes the form's label_suffix (a colon, by default) or, if set, the current field's label_suffix. The optional label_suffix parameter allows you to override any previously set suffix. For example, you can use an empty string to hide the label on selected fields. If you need to do this in a template, you could write a custom filter to allow passing parameters to label_tag.

BoundField.value()

Use this method to render the raw value of this field as it would be rendered by a Widget:

Code
>>> initial = {'subject': 'welcome'}
>>> unbound_form = ContactForm(initial=initial)
>>> bound_form = ContactForm(data={'subject': 'hi'}, initial=initial)
>>> print(unbound_form['subject'].value())
welcome
>>> print(bound_form['subject'].value())
hi

Menyesuaikan BoundField

If you need to access some additional information about a form field in a template and using a subclass of Field isn't sufficient, consider also customizing BoundField.

Bidang formulir penyesuaian dapat menimpa get_bound_field():

Field.get_bound_field(form, field_name)

Takes an instance of Form and the name of the field. The return value will be used when accessing the field in a template. Most likely it will be an instance of a subclass of BoundField.

If you have a GPSCoordinatesField, for example, and want to be able to access additional information about the coordinates in a template, this could be implemented as follows:

Code
class GPSCoordinatesBoundField(BoundField):
    @property
    def country(self):
        """
        Return the country the coordinates lie in or None if it can't be
        determined.
        """
        value = self.value()
        if value:
            return get_country_from_coordinates(value)
        else:
            return None

class GPSCoordinatesField(Field):
    def get_bound_field(self, form, field_name):
        return GPSCoordinatesBoundField(form, self, field_name)

Sekarang anda dapat mengakses negara di cetakan dengan {{ form.coordinates.country }}.

Mengikat berkas terunggah ke formulir

Dealing with forms that have FileField and ImageField fields is a little more complicated than a normal form.

Firstly, in order to upload files, you'll need to make sure that your <form> element correctly defines the enctype as "multipart/form-data":

Code
<form enctype="multipart/form-data" method="post" action="/foo/">

Secondly, when you use the form, you need to bind the file data. File data is handled separately to normal form data, so when your form contains a FileField and ImageField, you will need to specify a second argument when you bind your form. So if we extend our ContactForm to include an ImageField called mugshot, we need to bind the file data containing the mugshot image:

Code
# Bound form with an image field
>>> from django.core.files.uploadedfile import SimpleUploadedFile
>>> data = {'subject': 'hello',
...         'message': 'Hi there',
...         'sender': 'foo@example.com',
...         'cc_myself': True}
>>> file_data = {'mugshot': SimpleUploadedFile('face.jpg', <file data>)}
>>> f = ContactFormWithMugshot(data, file_data)

In practice, you will usually specify request.FILES as the source of file data (just like you use request.POST as the source of form data):

Code
# Bound form with an image field, data from the request
>>> f = ContactFormWithMugshot(request.POST, request.FILES)

Constructing an unbound form is the same as always -- just omit both form data and file data:

Code
# Unbound form with an image field
>>> f = ContactFormWithMugshot()

Percobaan untuk formulir multipart

Form.is_multipart()

If you're writing reusable views or templates, you may not know ahead of time whether your form is a multipart form or not. The is_multipart() method tells you whether the form requires multipart encoding for submission:

Code
>>> f = ContactFormWithMugshot()
>>> f.is_multipart()
True

Ini adalah sebuah contoh bagaimana anda mungkin menggunakan ini di cetakan:

Code
{% if form.is_multipart %}
    <form enctype="multipart/form-data" method="post" action="/foo/">
{% else %}
    <form method="post" action="/foo/">
{% endif %}
{{ form }}
</form>

Mensubkelaskan formulir

Jika anda mempunyai kelas-kelas Form yang berbagi berkas, anda dapat menggunakan pensubkelasan untuk memindahkan perulangan.

When you subclass a custom Form class, the resulting subclass will include all fields of the parent class(es), followed by the fields you define in the subclass.

In this example, ContactFormWithPriority contains all the fields from ContactForm, plus an additional field, priority. The ContactForm fields are ordered first:

Code
>>> class ContactFormWithPriority(ContactForm):
...     priority = forms.CharField()
>>> f = ContactFormWithPriority(auto_id=False)
>>> print(f.as_ul())
<li>Subject: <input type="text" name="subject" maxlength="100" required></li>
<li>Message: <input type="text" name="message" required></li>
<li>Sender: <input type="email" name="sender" required></li>
<li>Cc myself: <input type="checkbox" name="cc_myself"></li>
<li>Priority: <input type="text" name="priority" required></li>

It's possible to subclass multiple forms, treating forms as mixins. In this example, BeatleForm subclasses both PersonForm and InstrumentForm (in that order), and its field list includes the fields from the parent classes:

Code
>>> from django import forms
>>> class PersonForm(forms.Form):
...     first_name = forms.CharField()
...     last_name = forms.CharField()
>>> class InstrumentForm(forms.Form):
...     instrument = forms.CharField()
>>> class BeatleForm(InstrumentForm, PersonForm):
...     haircut_type = forms.CharField()
>>> b = BeatleForm(auto_id=False)
>>> print(b.as_ul())
<li>First name: <input type="text" name="first_name" required></li>
<li>Last name: <input type="text" name="last_name" required></li>
<li>Instrument: <input type="text" name="instrument" required></li>
<li>Haircut type: <input type="text" name="haircut_type" required></li>

It's possible to declaratively remove a Field inherited from a parent class by setting the name of the field to None on the subclass. For example:

Code
>>> from django import forms

>>> class ParentForm(forms.Form):
...     name = forms.CharField()
...     age = forms.IntegerField()

>>> class ChildForm(ParentForm):
...     name = None

>>> list(ChildForm().fields)
['age']

Awalan untuk formulir

Form.prefix

You can put several Django forms inside one <form> tag. To give each Form its own namespace, use the prefix keyword argument:

Code
>>> mother = PersonForm(prefix="mother")
>>> father = PersonForm(prefix="father")
>>> print(mother.as_ul())
<li><label for="id_mother-first_name">First name:</label> <input type="text" name="mother-first_name" id="id_mother-first_name" required></li>
<li><label for="id_mother-last_name">Last name:</label> <input type="text" name="mother-last_name" id="id_mother-last_name" required></li>
>>> print(father.as_ul())
<li><label for="id_father-first_name">First name:</label> <input type="text" name="father-first_name" id="id_father-first_name" required></li>
<li><label for="id_father-last_name">Last name:</label> <input type="text" name="father-last_name" id="id_father-last_name" required></li>

Awalan dapat juga ditentukan pada kelas formulir:

Code
>>> class PersonForm(forms.Form):
...     ...
...     prefix = 'person'

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