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In that case, the validation is performed as users work in the browser.For example, suppose you specify that a value should be an integer.Sometimes you have to validate information that doesn't come directly from an HTML form.

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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.

However, the test will be performed in server code.

You can control how validation errors are displayed by defining CSS classes that have the following reserved names: .

For example, here's what the page looks like if you forget to enter a course name, if you enter an, and if you enter an invalid date: By default, user input is validated after users submit the page — that is, the validation is performed in server code.

A disadvantage of this approach is that users don't know that they've made an error until after they submit the page.

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