Validating text area

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To get started, we'll create an HTML page that include a form with the id "contact". It should contain an label, an input (or textarea), and a span that will contain the error message.The form in HTML will look like this: tag improves usability.In client side validation the data is validated in the browser using Java Script before submitting the data to the server.For example, suppose your user submits the form without entering a mandatory field.

All credit cards are 16 digits and the 16th digit can be calculated based on the first 15 numbers.

By validating form responses before accepting them, we can alert users to their errors before they submit the form.

In this way, client side form validation can vastly improve the user experience.

If you haven't already, make sure that you've included the j Query library on your page: Since the name field is required, we simply need to check whether a value for the input exists.

If it exists, we'll apply the valid class and remove any invalid class.

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