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Función parseNIF

/ Published in: JavaScript
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Nombre: ParseNIF.
Recibe: cadena texto. por ejemplo un campo de texto de formulario.
Devuelve: true si cadena es un NIF valido, sino false.

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  1. function parseNIF(Cadena){
  2. 	if( Cadena.length==0 ){ return true;} // si es cadena buida no cal seguir.
  3. 	if( Cadena.length!=9 ){ return false;} // si la cadena no te 9 caracters ja podem donar false
  4. 	var Clave=new Array("T","R","W","A","G","M","Y","F","P","D","X","B"
  5. 			 ,"N","J","Z","S","Q","V","H","L","C","K","E","T");
  6. 	var PrimerDigito=Cadena.substr(0,1).toUpperCase();
  7. 	var UltimoDigito=Cadena.substr(Cadena.length-1).toUpperCase();
  8. 	if (!isNaN(PrimerDigito)){
  9. 		var Numeros=Cadena.substr(0,8).toUpperCase();
  10. 	}else{
  11. 		switch (PrimerDigito) { 
  12. 			case "K": case "L": case "M": case "X":	case "Y": 
  13. 				var Numeros=Cadena.substr(1,7);
  14. 				break;
  15. 			default: return false;
  16. 		}
  17.     }
  18. 	if (isNaN(Numeros)){
  19. 		return false;
  20. 	}else{
  21. 		return (Clave[Numeros%23]==UltimoDigito)? true : false;
  22. 	}
  23. }

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