POST and GET methods on the same button

I am currently learning asp.net core 3 and I can’t find any help regarding this issue that I have. I have a form that submits a value with a POST request. But I want the same button to have a GET request that populates another field with a .ajax / xmlhttprequest. But I want the POST method to be executed first and then the GET method. Is it possible to do it? I’ve tried doing it but I got stuck.

These are the methods inside my controller.

[HttpGet]
public async Task<IActionResult> GetConvertedAmount()
{
    var rate = await _db.ExchangeRates.Where(x => x.Name.Equals(_tM.Currency)).ToListAsync();         
    _tM.convertToCurrency(rate[0].Rate);
    var amount = _tM.Amount;           
    return Json(amount);           
}

[HttpPost]
public ActionResult CalculateExchangeRatio(int amount_give, string type_to_give)
{
    _tM.Amount = amount_give;
    _tM.Currency = type_to_give;
    return Ok();
}

And this is my JS script

$('#calculateButton').on("click", function () {
        $.ajax({
            url: "/trade/getconvertedamount",
            type: "get",
            success: function (amount) {
                console.log(amount);
                alert(amount);
            }
        });

        
    })

Answer

You can use the $.ajax ‘done’ chaining to complete the entire process:

$('#calculateButton').on("click", function () {
    $.ajax({
        url: "/trade/calculateexchangeratio",
        data: { amount_give: 9.99, type_to_give: 'blahblah' },
        type: "post"
    })
    .done(function(){
        $.ajax({
            url: "/trade/getconvertedamount",
            type: "get"         
        })
        .done(function (amount) { console.log(amount); alert(amount); });
    });
})