Excel like calculations are horrible with jquery - time to move to knockout/angular

math_in_jquery

function flt(fieldName) {
    var parsedValue = parseFloat($('#' + fieldName).val().replace(",", "."));
    if (isNaN(parsedValue)) parsedValue = 0;
    $('#' + fieldName).val(parsedValue);
    return parsedValue;
}

function recalculate(reset) {
    var r1 = (flt("i1") * 1000 - 2 * flt("i4"));
    $("#r1").val(Math.round(r1));

    $("#r2").text(flt("i2"));
    $("#r3").text(flt("i3"));

    var r4 = (flt("r1") - flt("i3")) / (flt("i2") + flt("i3"));
    $("#r4").val(Math.round(r4 * 10) / 10);
    $("#r5").val(Math.floor(r4));

    if (reset) $("#i5").val(Math.floor(r4));

    var r7 = r4 - flt("i5");
    $("#r7").text(Math.round(r7 * 10) / 10);
    var r8 = flt("i2") + flt("i3");
    $("#r8").text(Math.round(r8));
    $("#r8b").text(Math.round(r8));
    var r6 = r7 * r8;
    $("#r6").val(Math.round(r6));
    var r9 = r6 / 2;
    $("#r9").val(Math.round(r9 * 10) / 10);
    var r10 = flt("i2") / 3;
    $("#r13a").text(Math.round(r10));
    $("#r13b").text(Math.round(r10));

    $("#r14").text(Math.round(r1));
    $("#r15").text(Math.round(r8));

    if (r9 < r10) {
        $("#r11").show();
        $("#r12").hide();
        $("#r9").addClass("error");
        $("#r9").removeClass("strong");
    } else if (r9 > flt("i2")) {
        recalculate(true);
    } else {
        $("#r11").hide();
        $("#r12").show();
        $("#r9").addClass("strong");
        $("#r9").removeClass("error");
    }
}