With more and more personal information being stored on the Web—credit card data, social security numbers, maiden names, favorite pets—today's PHP developer cannot afford to be ignorant when it comes to security.
Sadly, most beginning programmers fail to understand the truth about security: there is no such thing as "secure" or "insecure." The wise programmer knows that the real question is a site is.
This was really a lengthy process which used to put a lot of burden on the server.
Java Script provides a way to validate form's data on the client's computer before sending it to the web server. First let us see how to do a basic form validation.
Form validation normally used to occur at the server, after the client had entered all the necessary data and then pressed the Submit button.
If the data entered by a client was incorrect or was simply missing, the server would have to send all the data back to the client and request that the form be resubmitted with correct information.
Scroll to and focus the first field with an error upon validation of the form.Now we will see how we can validate our entered form data before submitting it to the web server.The following example shows how to validate an entered email address.If you find you need more restrictive validations for these fields, you can use the attribute to further constrain what's acceptable.Be careful that you aren't too restrictive though, which might lead to false negatives and a poor user experience.