Develop Reference

Display error if there is error in fields

Im trying to raise error for empty fields or fields which are not validating in form
so Im doing this method below but I know this is not the best way...
views.py :
'KnowledgeForm': form,
'errors': str(form.errors),
but then in Django-template I have to use if for each field and im adding custom name for each field , i dont know why i cant use Verbose_name...
Template :
{% if errors %}
<div class="alert alert-danger">
<p>
{% if KnowledgeForm.errors.KnowledgeTitle %}
عنوان دانش: {{ KnowledgeForm.errors.KnowledgeTitle }}
{% endif %}
{% if KnowledgeForm.errors.KnowledgeTextSummary %}
Summary: {{ KnowledgeForm.errors.KnowledgeTextSummary }}
{% endif %}
{% if KnowledgeForm.errors.KnowledgeFromDate %}
from Date: {{ KnowledgeForm.errors.KnowledgeFromDate }}
{% endif %}
{% if KnowledgeForm.errors.KnowledgetoDate %}
To date : {{ KnowledgeForm.errors.KnowledgetoDate }}
{% endif %}
{% if KnowledgeForm.errors.KnowledgeProcess %}
Chart: {{ KnowledgeForm.errors.KnowledgeProcess }}
{% endif %}
{% endif %}
</p>
</div>
{% endif %}
Second method :
{% if KnowledgeForm.errors %}
<ul class="alert alert-danger">
{% for key,value in KnowledgeForm.errors.items %}
<li>{{ key|escape }} : {{ value|escape }}</li>
{% endfor %}
</ul>
{% endif %}
in this method i get the name based on whats used in models.py how can i change it?

The most clear and concise way is to use a forloop
Try replacing your entire if block in your HTML with the below code
{% for field in KnowledgeForm %}
{% if field.errors %}
<div class="alert alert-danger">
{{ field.label_tag }} {{ field.errors }}
</div>
{% endf %}
{% endfor %}
I don't think you need 'errors': str(form.errors),

It is because you convert errors to str and you don't need to separate this.
In your template:
# if you want to use verbose_name just use label_tag.
# label_tag is equal to your verbose name.
{% for field in KnowledgeForm %}
<div class="fieldWrapper">
{{ field.errors }}
{{ field.label_tag }} {{ field }}
</div>
{% endfor %}
So you have the error top of input

Unable to show Error with self.add_error()

I am having a problem and need your help.
I am making a django website, following information need to be verified. If it pass registration will be success and fail notice will show up. But Mean while there are no problem with success, but Notice won't show up if fail. Here are my form.py, could anyone help me? Much Thanks.
if settings.VERIFY_BY_SFID and all([i in cleaned_data for i in fields]):
number = cleaned_data["mobile_number"]
verified =SignUpFailureAttemptService.verify_mobile_number(number)
if not verified:
self.add_error(None, _("Your application was rejected."))
Template
{% extends 'accounts/login_base.html' %} {% load i18n %} {% load staticfiles %} {% load semanticui %} {% load common_templatetags %} {% block welcome_text %} {% trans 'Create your personal
E-wallet account.' %} {% endblock %} {% block slogan_text %} {% trans 'Buy and sell with protection
Easy and secure to send and receive money' %} {% endblock %} {% block bigger_text %} {% blocktrans %}Already have an account?{% endblocktrans %} {% trans 'Sign in' %} {% endblock %} {% block left_content %}
STEPS:
{% include 'accounts/signup/steps.html' with active_step=step steps=5 %}
{% block form_title %} {{ form_title }} {% endblock %}
{% if messages %} {% for message in messages %}
{{ message }}
{% endfor %} {% endif %}
{% block form_block %}
{% csrf_token %} {{ form.non_field_errors }} {% for hidden_field in form.hidden_fields %} {{ hidden_field.errors }} {{ hidden_field }} {% endfor %} {% for field in form.visible_fields %} {% if field.name == 'date_of_birth' %}
{{ field.label }}*
{% endif %}
{% if field.name == 'tos' %} {% blocktrans %} I agree to {% endblocktrans %} PDS and FSG {{ field }}
{% else %} {{ field }} {% endif %}
{{ field.help_text }}
{{ field.errors }}
{% endfor %}
{% if prev_step %} «   {% trans 'Back' %} {% endif %}
{% if next_step_title %}
{% trans 'NEXT STEP:' %} {{ next_step_title }}
{% endif %}
{% endblock %} {% endblock %} {% block scripts_end %} {% endblock %}

declare variable in if else block in django framework

I am doing a conditional block in loop django template , but unable to find exact answer for this.
Please consider my code here,
{% for data in app_data %}
{% if forloop.counter == 1 %}
{% declare_some_variable = 'hello' %}
{% else %}
{% declare_some_variable = 'bye' %}
{% endif %}
{{ declare_some_variable }} {{ data.name }}
{% endfor %}
This is what I want. But it does not work.

Try to use the with tag.
{% with declare_some_variable = "hello" %}
{% endwith %}
You can read more about with here
Or you can simply do:
{% trans "hello" as declare_some_variable %}

Form validation: how to get the actual length of a field shown in errors?

My form in Flask WTF looks like this:
class PublishForm(Form):
tweet = TextAreaField('tweet', [validators.DataRequired(), validators.Length(123, 123)])
When I show the error in template, I don't get the actual length shown. Any idea how to achieve this?
<div class="alert alert-danger">
{% for field in form.errors %}
{% for error in form.errors[field] %}
{{ error }}
{% endfor %}
{% endfor %}
</div>

I ended up fixing it like this:
{% if form.errors %}
<div class="alert alert-danger">
{% set count = form.tweet.data|length %}
{% for field in form.errors %}
{% for error in form.errors[field] %}
{{ error }}
Actual Length: {{ count }}
{% endfor %}
{% endfor %}
</div>
{% endif %}

How to use a for loop inside a Django conditional?

Basically if there is a certain GET parameter in the url (in this case "latest") I want to slice the object list by a different number than the usual. But doing this:
{% if 'latest' in request.GET %}
{% for object in object_list|slice:"22" %}
{% else %}
{% for object in object_list|slice:"10" %}
{% endif %}
// blah blah
{% endfor %}
causes a syntax error since Django expects a closing endfor instead of the else. Is there any way to use for loops inside conditionals?

You need to have a body in your for loop.
{% if 'latest' in request.GET %}
{% for object in object_list|slice:"22" %} {{ object }} {% endfor %}
{% else %}
{% for object in object_list|slice:"10" %} {{ object }} {% endfor %}
{% endif %}
Without it, you're saying the equivalent of the following Python code:
if 'latest' in request.GET:
for object in slice(object_list, 22):
#No code here
else:
for object in slice(object_list, 10):
#No code here
which obviously is an error.

Just close the for loop inside each conditional:
{% if 'latest' in request.GET %}
{% for object in object_list|slice:"22" %}
{{ object.name }}
{% endfor %}
{% else %}
{% for object in object_list|slice:"10" %}
{{ object.name }}
{% endfor %}
{% endif %}