Mastering Geospatial Analysis with Python

Forms

Web forms are used in web applications to accept data from a user and send it to the server for validation and processing. To generate the required forms (for example drop-downs, entry fields, and even password fields that hide their contents from the user), the Flask-WTF module and the WTForms module are used. These modules contain classes that make it possible to create the form components and to ensure that the data entered into them is valid for that field.

For our simple application, only one form is created. The ArenaForm form inherits from the FlaskFor class and contains a description attribute and field called selections. This field is a SelectField, which will create a drop-down list on the web page. It requires a description ...