Validating javascript text fields

Users get immediate feedback, which is convenient for them.Client-based validation can also reduce the number of times that the user has to submit the form to correct multiple errors.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.

When users enter values into an HTML form, the values that they enter are strings.

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This article discusses how to validate information you get from users — that is, to make sure that users enter valid information in HTML forms in an ASP. What you'll learn: If you ask users to enter information in a page — for example, into a form — it's important to make sure that the values that they enter are valid.

In many cases, the values you need are some other data types, like integers or dates.

Therefore, you also have to make sure that the values that users enter can be correctly converted to the appropriate data types.