Pull a return from a JS function to C#

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In the user registration process I want to validate your CPF by Javascript and return if it is valid or not in beckend. And so make a if with this result to insert it into the database or not. 

if (ValidaCpf(txtCpf.Text) == False){
    //retorna um erro
}

else{
   //cadastra o usuário
}

Note: I already have the function of validating the CPF and the method of Inserting the User in the BD. I just need to pass the result of the validation of Javascript to the C#.

javascript c# asp.net
  • 1

    Leave more information. Does this come from a form? How it is created?

  • You should not rely on javascript validation, you should always revalidate all data on the server, a malicious user can circumvent their javascript validations and send what they want to the server.

1 answer

0

This is a simple Jquery example for sending Cpf.

var cpf = 000000000000 
    $("button").click(function () { 
                $.ajax({ 
                    url: "/Home/PostJson", //local para onde vai ser enviado
                    type: "POST", //forma de envio
                    contentType: "application/json", 
                    data: '{cpf:cpf}', //informação enviada
                    success: function (data) { 
                        alert(data);
                    } 
                }); 
            })

Now looking at the application side

 public class HomeController : Controller 
    {          
        [HttpPost] 
        public JsonResult PostJson([FromBody] string cpf) 
        { 
           //faz a validação do cpf

           return Json(VarResultado, JsonRequestBehavior.AllowGet);
        } 
    }

Sends the CPF via JSON to the application side, which does the validation and then returns the result to the screen.

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