Validating required fields

If you validate the form using j Query, you can notice this and alert the user to their mistake instead of submitting the form.

Java Script form validation is a great way to help your users avoid mistakes when filling out a form Alternatively, if you want to protect your server from malicious users, then you should use server side validation because Java Script can be easily bypassed.

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When the submit button is pushed, j Query will check whether all fields are valid.

If any fields are not valid, the form will not be submitted and the user will be informed with error messages for the fields that are causing problems.

Finally, notice that instead of using "text" as the input type for the email and url fields, we use "email" and "url".

This will buy us free validation from browsers that support HTML5 even if Java Script is turned off.

Clicking on the label will move the mouse cursor to the input with the id specified in the for attribute.

The name of each input (or textarea) will be passed to the server to identify the contents of the form.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.Similarly, form data is typically saved in a database on the server.Because your database contains sensitive information, hackers may attempt to use your form to submit malicious commands to your backend database.For example, suppose you wanted to validate a credit card.

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