Validacion Formas En Javascript

Tutorial para validar formas en JavaScript
 
1.       Insertar script en la parte de
 

 
2.       Después del código de la forma insertar otro script

 var frmvalidator = newValidator("Nombre de la forma");

 frmvalidator.addValidation("Nombre del elemento","req","Please enter your First Name");
 
//Se deben agregar reglas para cada elemento. Por ejemplo: frmvalidator.addValidation("FirstName","maxlen=20",
"Max length for FirstName is 20");
 frmvalidator.addValidation("FirstName","alpha");
 
 frmvalidator.addValidation("LastName","req"); frmvalidator.addValidation("LastName","maxlen=20");
 
 frmvalidator.addValidation("Email","maxlen=50");
 frmvalidator.addValidation("Email","req");
 frmvalidator.addValidation("Email","email");
  frmvalidator.addValidation("Phone","maxlen=50");
 frmvalidator.addValidation("Phone","numeric");
 
 frmvalidator.addValidation("Address","maxlen=50");
 frmvalidator.addValidation("Country","dontselect=0");
 
//

 a.       Para cada vez que se agregue una validación:
 
frmvalidator.addValidation("Nombre del elemento","Regla de validación","Mensaje en caso de error");
 
3.       Table de Reglas de Validación
 required
req | The field should not be empty |
maxlen=???
maxlength=??? | checks the length entered data to the maximum. For example, if the maximum size permitted is 25, give the validationdescriptor as "maxlen=25" |
minlen=???
minlength=??? | checks the length of the entered string to the required minimum. example "minlen=5" |
alphanumeric /
alnum | Check the data if it contains anyother characters other than alphabetic or numeric characters |
num
numeric | Check numeric data |
alpha
alphabetic | Check alphabetic data. |
email | The field is an email field andverify the validity of the data. |
lt=???
lessthan=??? | Verify the data to be less than the value passed. Valid only for numeric fields.
example: if the value should be less than 1000...