I am creating a form using Flask-WTForms.
I am using a BooleanField so that a user can indicate they agree terms.
I cannot validate the BooleanField upon submission to ensure that it has been checked. I have tried using Required(), DataRequired() and custom validation but in each case I have not received a validation error.
Here are the nuts and bolts of the application:
from flask import Flask, render_template, session, redirect, url_for, flash
from flask_wtf import Form
from wtforms import BooleanField, SubmitField
from wtforms.validators import Required, DataRequired
from flask_bootstrap import Bootstrap
app = Flask(__name__)
app.config['SECRET_KEY'] = 'impossibletoknow'
bootstrap = Bootstrap(app)
class AgreeForm(Form):
agreement = BooleanField('I agree.', validators=[DataRequired()])
submit = SubmitField('Submit')
@app.route('/', methods=['GET', 'POST'])
def index():
form = AgreeForm()
if form.validate_on_submit():
agreement = form.agreement.data
if agreement is True:
flash('You agreed!')
return redirect(url_for('index', form=form))
form.agreement.data = None
agreement = False
return render_template('index.html', form=form)
if __name__ == '__main__':
app.run(debug=True)
And here is the index.html template...
{% import "bootstrap/wtf.html" as wtf %}
{% block content %}
<div class="container">
{% for message in get_flashed_messages() %}
<div class="alert alert-warning">
<button type="button" class="close" data-dismiss="alert">×</button>
{{ message }}
</div>
{% endfor %}
{{ wtf.quick_form(form) }}
</div>
{% endblock %}
Any suggestions would be gratefully received.
WTF stands for WT Forms which is intended to provide the interactive user interface for the user. The WTF is a built-in module of the flask which provides an alternative way of designing forms in the flask web applications.
WTForms is a flexible forms validation and rendering library for Python web development. It can work with whatever web framework and template engine you choose. It supports data validation, CSRF protection, internationalization (I18N), and more.
The string field is used for allowing users to enter unformatted text information into your form in a limited fashion. Creating multiple strings is useful for collecting directed information, such as answers from your user requiring single words or brief sentences.
Works for me— you do need to use DataRequired()
(Required
is being deprecated):
from flask import Flask, render_template
from flask_wtf import Form
from wtforms import BooleanField
from wtforms.validators import DataRequired
app = Flask(__name__)
app.secret_key = 'STACKOVERFLOW'
class ExampleForm(Form):
checkbox = BooleanField('Agree?', validators=[DataRequired(), ])
@app.route('/', methods=['post', 'get'])
def home():
form = ExampleForm()
if form.validate_on_submit():
return str(form.checkbox.data)
else:
return render_template('example.html', form=form)
if __name__ == '__main__':
app.run(debug=True, port=5060)
Template:
<form method="post">
{{ form.hidden_tag() }}
{{ form.checkbox() }}
<button type="submit">Go!</button>
</form>
<h1>Form Errors</h1>
{{ form.errors }}
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