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To set default form values with Django Python, we create the form instance with the default values in the constructor arguments. Or we can put the default values in the form definition. to create a JournalForm instance with the initial argument set to a dictionary with the initial form values.
The default form widget for this field is CheckboxInput, or NullBooleanSelect if null=True. The default value of BooleanField is None when Field. default isn't defined. One can define the default value as true or false by setting the default attribute to true/false simultaneously.
default: The default value for the field. This can be a value or a callable object, in which case the object will be called every time a new record is created. null: If True , Django will store blank values as NULL in the database for fields where this is appropriate (a CharField will instead store an empty string).
If you're just using a vanilla form (not a ModelForm), you can set a Field initial value ( https://docs.djangoproject.com/en/2.2/ref/forms/fields/#django.forms.Field.initial ) like
class MyForm(forms.Form):
my_field = forms.BooleanField(initial=True)
If you're using a ModelForm, you can set a default value on the model field ( https://docs.djangoproject.com/en/2.2/ref/models/fields/#default ), which will apply to the resulting ModelForm, like
class MyModel(models.Model):
my_field = models.BooleanField(default=True)
Finally, if you want to dynamically choose at runtime whether or not your field will be selected by default, you can use the initial parameter to the form when you initialize it:
form = MyForm(initial={'my_field':True})
from django.db import models
class Foo(models.Model):
any_field = models.BooleanField(default=True)
I am using django==1.11. The answer get the most vote is actually wrong. Checking the document from django, it says:
initial -- A value to use in this Field's initial display. This value is not used as a fallback if data isn't given.
And if you dig into the code of form validation process, you will find that, for each fields, form will call it's widget's value_from_datadict to get actual value, so this is the place where we can inject default value.
To do this for BooleanField, we can inherit from CheckboxInput, override default value_from_datadict and init function.
class CheckboxInput(forms.CheckboxInput):
def __init__(self, default=False, *args, **kwargs):
super(CheckboxInput, self).__init__(*args, **kwargs)
self.default = default
def value_from_datadict(self, data, files, name):
if name not in data:
return self.default
return super(CheckboxInput, self).value_from_datadict(data, files, name)
Then use this widget when creating BooleanField.
class ExampleForm(forms.Form):
bool_field = forms.BooleanField(widget=CheckboxInput(default=True), required=False)
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