NIP (Polish Tax number) jQuery Validation

index.html

<form id="form">
     <input type="text" name="nip" id="nip" placeholder="NIP" required>
							
							<input type="reset" name="reset" value="Reset" class="wyslij" style="background-color:#fff;"><input type="submit" name="submit" value="Wyślij" class="wyslij" style="background-color:#fff;">
						</form>

Nip-polish-tax-number-jquery-validation.markdown

NIP (Polish Tax number) jQuery Validation

In this Pen I'll show you simple algorithm to check if NIP (Polish Tax Number) is correct or not.

A Pen by Paweł Mansfeld on CodePen.

License.

script.js

$("#nip").change(function(){
		
			var currentnip = $("#nip").val().replace(/\D/g,"");
			$(this).val(currentnip); 
		
		});

$("#form").submit(function(){
			var nip = $("#nip").val();
			var nipsum = parseInt(nip.charAt(0))*6+parseInt(nip.charAt(1))*5+parseInt(nip.charAt(2))*7+parseInt(nip.charAt(3))*2+parseInt(nip.charAt(4))*3+parseInt(nip.charAt(5))*4+parseInt(nip.charAt(6))*5+parseInt(nip.charAt(7))*6+parseInt(nip.charAt(8))*7;
			reszta = nipsum % 11;
			if(reszta == parseInt(nip.charAt(9))){
				
				alert("NIP poprawny!");
			}
			else{
				alert("NIP niepoprawny");
			}
		});

scripts

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>