javascript - 根据日期选择值计算订单价格

Question

好吧，我知道有一个简单的方法可以做到这一点，但我已经很多年没有做过很多 JavaScript 了

我的客户有一个用于事件注册的在线订单(由以前的网络开发人员开发)。目前订单总额只是一个隐藏字段:

<INPUT value=78.00 type=hidden name=amount />

但我需要根据他们选择的日期来计算总数:

<SELECT style="BACKGROUND-COLOR: #ffff99" name=altDate1>
<OPTION value=04/09> Friday, April 9 </OPTION>
<OPTION value=04/14> Wednesday, April 14 </OPTION>
<OPTION value=04/16> Friday, April 16 </OPTION>
<OPTION value=04/19> Monday, April 19 </OPTION>
<OPTION value=04/29> Thursday, April 29 </OPTION>
</SELECT>

这是处理表单的 javascript:

<SCRIPT language=Javascript> 

function PaymentButtonClick() {

    document.addform.Product_Name.value = document.Information.StudentLastName.value + ","+ 
                                          document.Information.StudentFirstName.value+","+
                                          document.Information.StudentID.value+","+
                                          document.Information.altDate1.name+","+","+
                                          document.Information.Guests.value+ "," + 
                                          document.Information.StudentType.value;

    document.addform.Product_Code.value = document.Information.StudentID.value;


    if ((document.Information.UCheck.checked==true) &&
        (document.Information.altDate1.value != "") && 
        (document.Information.altDate1.value != "x")) {

        if (document.Information.StudentLastName.value != "" ||
            document.Information.StudentFirstName.value != "" ||
            document.Information.StudentID.value != "" )  {

                document.addform.submit();
        }
        else { 
            alert("Please enter missing information");
        } 
    }
}

</SCRIPT>

Answer 1

将此 switch 语句插入您的表单处理函数中:

switch (document.Information.altDate1.value) {
    case '04/09':
        document.Information.amount.value = 78.00;
        break;
    case '04/14':
        document.Information.amount.value = 79.00;
        break;
    case '04/16':
        document.Information.amount.value = 80.00;
        break;
    case '04/19':
        document.Information.amount.value = 81.00;
        break;
    case '04/29':
        document.Information.amount.value = 82.00;
        break;
}