Minimum knowledge to use Form in Flask

Overview

How to define, render and validate a Form using Flask's Flask-WTF

Form definition

class AnimalForm(FlaskForm):
    name = StringField('name', validators=[validators.Required(), validators.length(max=30)])
    kind = StringField('kind', validators=[validators.Required(), validators.length(max=10)])
    description = TextAreaField('description', validators=[])
point

--Create by inheriting FlaskForm --Multiple validators can be passed to validators

Form rendering

      <form method="POST">
      <p>{{ form.name.label }}:{{ form.name(size=30) }}</p>
      <p>{{ form.kind.label }}:{{ form.kind(size=20) }}</p>
      <p>{{ form.description.label }}:{{ form.description(cols="50", rows="20") }}</p>
      <button type="submit">Submit</button>
      </form>
point

--You can get the name defined in form by accessing label --Each field is callable and renders HTML --When rendering a field, if you pass an argument, it will be converted to an HTML property.

Validation of Submitted Form

    form = AnimalForm()
    if form.validate_on_submit():
        name = form.name.data
        kind = form.kind.data
        description = form.description.data
point

--valid_on_submit checks whether it is a post and validates the data --You can get the validated data by accessing data

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