Flask Forms

Forms with WTForms

pip install flask-wtf

from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, TextAreaField
from wtforms.validators import DataRequired, Email, Length, EqualTo

class RegistrationForm(FlaskForm):
    name     = StringField("Name",     validators=[DataRequired(), Length(2, 100)])
    email    = StringField("Email",    validators=[DataRequired(), Email()])
    password = PasswordField("Password", validators=[DataRequired(), Length(8)])
    confirm  = PasswordField("Confirm",  validators=[EqualTo("password")])

# In route
@app.route("/register", methods=["GET","POST"])
def register():
    form = RegistrationForm()
    if form.validate_on_submit():
        user = User(name=form.name.data, email=form.email.data)
        user.set_password(form.password.data)
        db.session.add(user)
        db.session.commit()
        return redirect(url_for("auth.login"))
    return render_template("register.html", form=form)

# Template
# {{ form.hidden_tag() }}  — CSRF token
# {{ form.email.label }}
# {{ form.email(class="form-control") }}
# {% for error in form.email.errors %} ... {% endfor %}