Can't change ModelForm fields' default error message

Using Django
1

Info

I adapt my model form to my html form design, It can submit data successfully, It has placeholder which is I wrote , It gives the error when you forget to input data required fields.
However, I couldn’t change default message. It is always, “This value is required.”

My model

class MyModel(models.Model):
      a_field = models.CharField(max_length=254,)
      b_field = models.EmailField(max_length =254)
...other fields...

I’m sharing you what I tried to change error message on the forms.

#forms.py
class MyForm(forms.ModelForm):
    class Meta:
        model = MyModel
        fields = ('a_field', 'b_field', 'c_field', ....other fields)

     widgets = {
    'a_field':forms.TextInput(attrs={'placeholder':'Placeholder a'}),
    'b_field':forms.TextInput(attrs={'placeholder':'Placeholder b'}),
     .... others...
    }

First, I tried this.

    error_messages = {
        'a_field': {
            'required': _("Custom required message"),
        },
    }

In the def init… I tried these things,

def __init__(self, *args, **kwargs):
    super(PersonForm, self).__init__(*args, **kwargs)

I added this lines,

    self.fields['a_field'].error_messages.update({
        'required': 'Required Message',
    })

Doesn’t change the error message…

    self.fields['b_field'].error_messages = {'required': 'custom required message'}

I tried to add this too for all fields but nothing changes.

    for field in self.fields.values():
        field.error_messages = {'required':'The field {fieldname} is required'.format(
            fieldname=field.label)}

My template currently:

…

    <form method="post" novalidate class="form-control contact-form__inner" action="{% url 'demo'%}">
      {% csrf_token %}
      <div class="contact-form__inner-left">
        <div class="form-item form-item--border">
          {{ form.field_a }}
        </div>
        <div class="form-item form-item--border">
          {{ form.field_b }}
        </div>

…

My template before I manipulate the form with my modelform,

This required messages were visible.

    <form action="" class="form-control contact-form__inner">
      <div class="contact-form__inner-left">
        <div class="form-item form-item--border">
          <input type="text" placeholder="Placeholder a" data-parsley-required-message="Required message." required>
        </div>
        <div class="form-item form-item--border">
          <input type="text" placeholder="Placeholder b" data-parsley-required-message="Required message." required>
        </div>

…

What am I missing ? Why I can’t change the error messages ?

Thanks in advance…

2

Are you using any JavaScript framework to perform client-side validation before the form is submitted?

3

@KenWhitesell , thank you for interest.

Because of I do not do the front-end works in this project, I don’t know much about it, but I think it is being used.

Because, in the post I wrote, at the bottom there is the piece of original version of the template. and the required message there was working.

4

Looks like then you need to find out from the front end what needs to be supplied for the error messages - this wouldn’t be something under Django’s form control, but rather something you may need to specifically render in the template.