CRM 2011 - JavaScript don't update fields

Question

I have a basic calculation on javascipt. It calculates true and changes the field's value with true value. But when I check it on database, it shows me ex-value of a field. I use

Xrm.Page.getAttribute("new_exchangerate").fireOnChange();

on formOnLoad. My actual code;

function ExchangeRateOnChange() {
    var exchangeRate = Xrm.Page.getAttribute("new_exchangerate").getValue();
    if (!exchangeRate) {
        exchangeRate = 1;
    }
    var saleAmount = Xrm.Page.getAttribute("new_saleamount").getValue();
    if (saleAmount) {
        Xrm.Page.getAttribute("new_saleamounttl").setValue(saleAmount * exchangeRate);
        // Xrm.Page.getAttribute("new_saleamounttl").setSubmitMode("always");
        // I used setSubmit, but it won't worked too
    }
}

Answer 1

In case you field is disabled on a form changes would not be sent to CRM Endpoints. To make it work try to add following after you've set value:

Xrm.Page.getAttribute("new_saleamounttl").setSubmitMode("always");

Answer 2

My first thought was: Xrm.Page.getAttribute("new_exchangerate").addOnChange(this.ExchangeRateOnChange); Because calling Xrm.Page.getAttribute("new_exchangerate").fireOnChange(); doesn't call your method. But you said that it has calculate fields.

You can try to call Xrm.Page.getAttribute("new_saleamounttl").fireOnChange(); after you change field.