To check for incorrectly submitted form data, we will use validators.
- [Instructor] Now that we've rendered the form,…in this video we will validate the form data.…When a user visits slash signup,…he'll see the Sign Up form…and can fill it out with his information,…but what happens when a user fills out the form…with incorrect or missing information?…For example, what happens if this email is invalid…and I have a missing password?…The form still submits successfully in this situation.…This is not good.…We need a way to check the user's input…so that it won't cause problems later on.…We can check form data using validators.…
Flask WTF comes with several use of…validators that we can use.…The most basic validator is Data Required,…and it checks that the field is filled in.…So first import the Data Required validator.…Then for each field make a list named validators,…and add Data Required to that list.…This validator will make sure that…none of the fields are empty.…So if a user fills in each field and form…and submits it the validation check will return true.…
If data does not exist for one or more fields…
The need for talented developers is greater than ever before. A basic grounding in a framework as simple, powerful, and easy-to-learn as Flask—a Python micro framework—can help launch your programming career. Get a basic grounding in the fundamental concepts of web development, as well as the hands-on experience required to successfully build web apps with Flask, in this course with Packt trainer Lalith Polepeddi.
It starts with turning your computer into a modern development machine. Then learn everything you need to know about Flask: models, views, controllers, web templates, forms, validation, and API interactions. Lalith shows how to apply these concepts and develop a powerful database-backed Flask app, including a full authentication system. Finally, Lalith shows how to extend the app's functionality by integrating it with third-party APIs. When you finish this course, you will be fully equipped to build your very own custom web apps with Flash.
- Setting up your development environment
- Creating a homepage
- Building templates
- Routing with Flask
- Deploying to Heroku
- Storing data
- Creating and rendering forms
- Validating form data
- Creating a user authentication system for login and logout
- Implementing location-based app features
Skill Level Beginner
1. Setting Up the Environment
2. Getting Started
3. Storing Data
4. Signing Up
5. Logging In and Logging Out
6. Authorization and User Roles
7. Bookmarking Places
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