TypeError: stepUp called on an object that does not implement interface HTMLInputElement

Question

I have this code

Find/Add Horse

And I do

Answer 1

I had similar issue, it was because I forgot to have .val() when trying to access the value of the input element.

 $.post('@Url.Action("Calculate", "AvailableInvestment")',
            {
                code: $("#calculatorCode").val(),
                amount: $("#calculatorAmount").val()
            },
            function (data, status) {
                console.log(data, status);
                if (data.success == true) {
                     
                }

                else {  
                     
                    return;
                }

            }
        );