Code for validating date in javascript

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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.It has an onsubmit event attached to a function called validate() that we are going to create later inside this form there are three inputs one for our phone number another one is for postal codes and the third and the last one is a submit button that is going to submit the form after we are done filling it. It contains only the code that validates the phone number.

You don't need to do that when using HTML 5 type="date" attribute (the format then will be forced to be YYYY/MM/DD).Javascript form validation is not necessary, and if used, it does not replace strong backend server validation.That's why Parsley is here: to let you define your general form validation, implement it on the backend side, and simply port it frontend-side, with maximum respect to user experience best practices.So basically the expression tries to match with a phone number like this (541) 754-3010 or like this 541-754-3010 or with spaces Now let’s move on to the Postal code part.Here I have added a new variable called postal Code to fetch the postal code from the form then created another variable to store the postal code regular expression which we will be discussing in a second.

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