Problem passing value to PHP variable with Ajax

Question

I know it must be a frequent problem and all, but I looked in several places and could not fix my problem:

In the project I am working on there is a javascript function in which a variable called codigo receives a certain value.

So when a button is clicked, the value of the variable codigo must be passed to a PHP variable for insertion in the database.

The problem is I can’t make that transfer with the values.

Here’s the part where the button is

<input  type="submit" name="btnEnviar" onclick="ConfirmarAssinatura();" class="btn btn-primary btn-lg" value="Confirmar Assinatura"/>

Here is the part in Javascript:

    function ConfirmarAssinatura(){


    $.ajax({

      url:'tela-planos.php',
      type:"POST",
      cache: false,
      data: { 'cod': codigo },
      success: function (){
        alert (codigo)
      },
      erro: function(result){
        alert('errou')
      }

    });


  }

And here is the part of php code where you will perform the action:

if (isset($_REQUEST['cod'])){

// executa o resto do código.

}

The problem is it’s not working. Can someone help me?

Answer 1

The variable code was not set. Now she is taking the value of her input, which at the moment is Confirm Subscription. In your PHP code you will have something like:

echo $_POST['cod'];

This will print on the screen Confirm Subscription

function ConfirmarAssinatura(){
    var codigo = $('#myinput').val();
    console.log(codigo);
    $.ajax({
        url:'tela-planos.php',
        type:"POST",
        cache: false,
        data: { 'cod': codigo },
        success: function (data){
            alert (data)
        },
        erro: function(result){
            alert('errou')
        }
    });
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input  type="submit" name="btnEnviar" onclick="ConfirmarAssinatura();" class="btn btn-primary btn-lg" value="Confirmar Assinatura" id="myinput"/>