So you must check these values in order to protect your application. This test would pass the first time that the page is requested, but not when the request is a form submission. If you want to customize this process, there are various places to make changes, each one serving a different purpose.You might also have certain restrictions on the values.
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Note Important Validating user input is also important for security.
When you restrict the values that users can enter in forms, you reduce the chance that someone can enter a value that can compromise the security of your site.
You can add support to perform validation in client script.
In that case, the validation is performed as users work in the browser.
A disadvantage of this approach is that users don't know that they've made an error until after they submit the page.
If a form is long or complex, reporting errors only after the page is submitted can be inconvenient to the user.Three types of cleaning methods are run during form processing.These are normally executed when you call the is raised, the method should return the cleaned (normalized) data as a Python object.You can control how validation errors are displayed by defining CSS classes that have the following reserved names: .These pairs let you define rules for both conditions: an error condition and a "normal" (non-error) condition. They will be disabled when the form input are invalid to prevent the valid form from multiple submissions.