Javascript for validating date

It's important to understand that the markup for the error display is always rendered, even if there are no errors.

For example, if a page has an element as a placeholder for an individual field error, even if there is no error.

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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.

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.

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.

For example, you don't want to process a form that's missing critical information.

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

A typical example is a page where a value is passed in a query string, as in the following example: source, including form-field values, query-string values, and cookie values.

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