Checking date entries

After customizing the date format in the Django modelform widget and jQuery datepicker, I encountered an error indicating that the field is not valid.

class Sale_Invoice_Main_Page(forms.ModelForm):
    class Meta:
        model = SaleInvoice
        fields = '__all__'
        exclude = ['created_at','updated_at','transiction_type']
        widgets = {'description' : forms.TextInput(attrs={ 'placeholder' : 'description'}),
                   'invoice_no' : forms.TextInput(attrs={ 'readonly' : 'True'}),
                   'total_amount' : forms.TextInput(attrs={ 'readonly' : 'True'}),
                   'invoice_date' : forms.DateInput(attrs={ 'class' : "vdate" },format=('%d-%m-%Y')),
                   'due_date' : forms.DateInput(attrs={ 'readonly' : "True" },format=('%d-%m-%Y')),
                    }


class SaleInvoice(models.Model):
    customer = models.ForeignKey(Customer_data , on_delete=models.CASCADE)
    invoice_date = models.DateField(null=True,blank=True)
    invoice_no = models.PositiveIntegerField(unique=True)
    due_date = models.DateField(blank=True,null=True)
    address = models.TextField()
    total_amount = models.PositiveIntegerField(null=True,blank=True)
    description = models.TextField(null=True,blank=True)
    transiction_type = models.CharField(max_length=50,blank=True)
    author = models.CharField(max_length=30)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    def __str__(self):
        return self.address

Understanding the issue with jQuery date picker:

{#     Date Picker #}
    <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
    <link rel="stylesheet" href="/resources/demos/style.css">
    <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
    <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
    <script>
        $( function() {
            $( ".vdate" ).datepicker({
                dateFormat: "dd-mm-yy"
            });
        } );
    </script>

I need to identify the mistake causing the validation error.

Answer №1

Dealing with localization can sometimes present challenges. Typically, you would modify your settings by adding DATE_INPUT_FORMATS. This allows you to specify which formats should be accepted when entering data into a date field, like so:

DATE_INPUT_FORMATS = [
    '%d-%m-%Y'
]

Adding this to your settings should resolve the issue. However, it can get a bit complex when USE_L10N is set to True. In such cases, the format dictated by the locale takes precedence over custom formats. To work around this, it's recommended not to hardcode the date format in your jQuery datepicker, but instead utilize defaults and fetch the date format from DATE_INPUT_FORMATS. Here's an example of how to achieve this:

from django.utils import formats
# The first default date format in English is '%Y-%m-%d', while most European languages use '%d.%m.%Y' etc.
date_format = formats.get_format("DATE_INPUT_FORMATS")[0]
date_format = date_format.split()[0].replace('%Y', 'YY').replace('%d', 'dd').replace('%m', 'mm')

Then, in your template, you can use it like so:

<script>
    $( function() {
        $( ".vdate" ).datepicker({
            dateFormat: "{{ date_format }}"
        });
    } );
</script>

By following this approach, the date format will be consistent regardless of format precedence. It's advisable to include the date format in your own context processor, ensuring it's available in all your templates:

my_context_processor.py

from django.utils import formats

def common_context(request):
    ''' Common variables used in templates '''

    date_format = formats.get_format("DATE_INPUT_FORMATS")[0]
    date_format = date_format.split()[0].replace('%Y', 'YYYY').replace('%d', 'dd').replace('%m', 'mm')

    return {'date_format ': date_format}

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