Re: How to do validation on a form which is opened by clicking a button

Use this as below  in your view - 

context["form"] = YourForm(request.POST or None)

and just a method if form.is_valid(), there is no need for the else part.

On Friday, 28 February 2020 02:41:04 UTC+5:30, Sunil BK wrote:

Hello community

I am trying to build a simple form which can be opened using a button. It should offer some fields which should be further process after validation. And there is exactly my issue. When I write some data into the fields and click the submit button. the validation error is NOT displayed below the screen like in this screeshot:

but is displayed in the log.

Can somebody give me a hint what I am missing here?

Thanks a lot!!
Sunil

This is the code I am using:

my HTML Code for presenting the form.

{% extends 'base.html' %}
{% load crispy_forms_tags %}
{%block content%}
<br>
<h1 style="color:black">Add System to Organization</h1>
<br>
<div class="col" style="color:black">
    <form method="post" action="{% url 'chr_add_system' %}" class="uniForm">
        {% csrf_token %}
        {{form|crispy}}
        <input type="submit" value="Submit"/>
    </form>
</div>
<br>
{%endblock content%}

the view:

def chr_add_system_view(request):
    if request.method == 'POST':
        form = AddChrSystemForm(request.POST)
        if form.is_valid():
            print('add_system-------->valid')
            # TODO: do something
            return redirect(chr_systems_view)
        else:
            print('form.errors ' + str(form.errors))
            form = AddChrSystemForm()
            context = {'form': form}
            return render(request=request, template_name='chr/add_system.html', context=context)

the form:

class AddSystemForm(ModelForm):

    def __init__(self, *args, **kwargs):
        super(AddSystemForm, self).__init__(*args, **kwargs)
        self.fields['profile_name'].widget.attrs['readonly'] = True

    class Meta:
        model = System
        fields = '__all__'

    def clean_system_id(self):
        print('validating oid of system..')

        system_id = self.cleaned_data['system_id']
        print('system_id: ' + system_id)

        if "2.16" not in system_id:
            print('oid of system id is invalid')

            raise forms.ValidationError(
                "Your submissionset source oid seems to be invalid. ==> it has to be a valid oid and must start with: 2.16")
        print('oid of system id is valid')
        return system_id

the button where the form is called:

<div class="col system_title">
    <font style="color:Black;"><b>SourceId</b></font>
    <form method="post" action="{% url 'add_system' %}" class="uniForm">
        {% csrf_token %}
        <button type='submit' name="add_system"
                class="btn btn-warning btn-sm float-right" value="{{item0}}">[WIP] Add System
        </button>
    </form>
</div>

my class

class System(models.Model):
    system_id = models.CharField(max_length=100)
    abbreviation = models.CharField(max_length=100, default="SRC-")
    software_name = models.CharField(max_length=100, default="Portal")
    vendor = models.CharField(max_length=100, default="vendor")
    profile_name = models.CharField(max_length=100, default="Source")

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