我可以't使用if语句(javascript）打印html选择菜单中的值

我在这些方面遇到了一段时间的麻烦，我不知道如何使变量（座位）等于"阳台"、"下部区域"、"一级"或"二级"。

我尝试过使用.select，制作一些失败的数组，检查过。

我需要能够使座位变量等于根据他们选择的选择菜单位的值之一（我使用的是if语句）

我将在下面添加我的html和Javascript。

<div data-role="fieldcontain"> 
      <label for="selectmenu" class="select">Preferred Seating:</label> <!-- Following drop down checkbox -->
      <select name="selectmenu" id="selectmenu">
        <option name="selectmenu" value="200" class="lowerLvl" id="lowerArea" >Lower Area($200)</option>
        <option name="selectmenu" value="150" class="levelOne" selected="selected" id="levelOne">Level 1($150)</option>
        <option name="selectmenu" value="100" class="levelTwo" id="levelTwo">Level 2($100)</option>
        <option name="selectmenu" value="200" class="balcony" id="balcony">Balcony($200)</option>
      </select>
    </div>
    <!--End of DropDownBoxes-->
    <!--START OF CHECK BOXES-->
    <div data-role="fieldcontain">
      <fieldset data-role="controlgroup">
        <legend>Prefered night:</legend>
     <input type="radio" name="checkbox1" id="checkbox1_0" class="custom" value=""  checked="checked" /></option>
        <label for="checkbox1_0">Thursday</label>
        <br />
            <input type="radio" name="checkbox1" id="checkbox1_1" class="custom" value="" />
                <label for="checkbox1_1">Friday</label>
                <br /><!--Break as on Example-->
                    <input type="radio" name="checkbox1" id="checkbox1_2" class="custom" value="" />
                    <label for="checkbox1_2">Saturday</label>
      </fieldset><!-- Above are check boxes -->
    </div>
    <div data-role="fieldcontain">
      <fieldset data-role="controlgroup" data-type="horizontal">
        <legend>Subscribe to weekly newsletter: </legend>
        <input type="checkbox" name="newletter" id="news" class="custom" value="" />
      </fieldset>
    </div>
<!--END OF CHECK BOXES-->
<!--Put a tick box here that asks for weekly mail-->
         <button type="submit" value="Register" onClick="validateGalaOrder()"></button>
            <p id="OrderInput"></p><!--USERS INPUT RETURNS TO THIS <P>-->
            <p id="tktCost"></p>
            <p id="orderErrorMsg"></p><!--INCORRECT INPUT MESSAGES RETURN TO THIS <P>-->

下面是我的JavaScript。

请注意，有些JavaScript来自选择菜单上方html的其他部分。

目前，我正在从选择菜单中获取"值"（这是在变量cost下的else语句中）

function validateGalaOrder() {
    var orderErrorMsg = "";
    var OrderInput = "";
    var ValidateOrderName = document.getElementById('txtOrderName').value;
    var numTickets = document.getElementById('numTickets').value;
    var Orderemail = document.getElementById('txtOrderEmail');
    var filter = /*Email Symbol and letter Validator*/ /^([a-zA-Z0-9_.'-])+'@(([a-zA-Z0-9'-])+'.)+([a-zA-Z0-9]{2,4})+$/; //This filters out the email input
    var lowerLvl = document.getElementById('lowerArea').value;
    var lvlOne = document.getElementById('levelOne').value;
    var lvlTwo = document.getElementById('levelTwo').value;
    var Balcony = document.getElementById('balcony').value;
    var cost = '';
    var seating = '';
    var prefNight; //This will contain the prefered night and print it
    var newsLetter; //Has details about if they have chosen the newsletter or not.

    if (ValidateOrderName.length <= 2) {
        orderErrorMsg += ("<b>-ERROR- Please enter a valid name with a length of at least 3 letters</b>");
        document.getElementById('orderErrorMsg').innerHTML = orderErrorMsg;
        document.getElementById('txtOrderName').value = ''; //will clear input field if false.
        document.getElementById('txtOrderName').focus(); //this Focuses on textbox if input is wrong. 
        //alert("-ERROR- Please enter a name more than one letter!"); 
        document.getElementById('OrderInput').innerHTML = ''; //If someone decides to change there input and that changed input is wrong then this will clear the other data from under the button and just show the error message
        return false;
    }

    if (!filter.test(Orderemail.value)) {
        orderErrorMsg += ("<b>-ERROR- Please provide a valid email address.</b>");
        document.getElementById('orderErrorMsg').innerHTML = orderErrorMsg;
        document.getElementById('txtOrderEmail').value = '';
        document.getElementById('txtOrderEmail').focus(); //this Focuses on textbox if input is wrong.   
        // alert('Please provide a valid email address');
        document.getElementById('OrderInput').innerHTML = ''; //If someone decides to change there input and that changed input is wrong then this will clear the other data from under the button and just show the error message
        return false;
    }
    if (numTickets <= 0) {
        orderErrorMsg += ("<b>-ERROR- Please enter an amount of tickets greater than zero</b>");
        document.getElementById('orderErrorMsg').innerHTML = orderErrorMsg;
        document.getElementById('numTickets').value = '';
        document.getElementById('numTickets').focus(); //this Focuses on textbox if input is wrong.
        /*alert("-ERROR- Please enter a mobile number with exactly 10 numeric digits");*/
        document.getElementById('OrderInput').innerHTML = ''; //If someone decides to change there input and that changed input is wrong then this will clear the other data from under the button and just show the error message
        return false;
    } else {
        if (document.getElementsById('lowerArea').checked == true) {
            seating = "Lower Area";
        }
        if (document.getElementsById('levelOne').checked == true) {
            seating = "Level One";
        }
        if (document.getElementsById('levelTwo').checked == true) {
            seating = "Level Two";
        }
        if (document.getElementsById('balcony').checked == true) {
            seating = "Balcony";
        }
        //Below is the checkbox printing
        if (document.getElementById('checkbox1_0').checked == true) {
            prefNight = 'Thursday';
        }
        if (document.getElementById('checkbox1_1').checked == true) {
            prefNight = 'Friday';
        }
        if (document.getElementById('checkbox1_2').checked == true) {
            prefNight = 'Saturday';
        }
        //Above is the checkbox printing
        if (document.getElementById('news').checked == true) {
            newsletter = "You wish to recieve our weekly E-mail";
        }
        if (document.getElementById('news').checked == false) {
            newsletter = "You do not wish to recieve our weekly E-mail";
        }
        cost = parseInt(document.getElementById('selectmenu').value, 10) * numTickets; //This calculates the cost(selectMenu*numTickets)
        var Orderemail = document.getElementById('txtOrderEmail').value; //This will grab the email value Inputed.
        OrderInput += ("Your details are: <br />" + "Your E-mail address is: " + Orderemail + "<br />" + newsletter + "<br /> <br />" +
            "You have the following tickets reserved: <br />" + numTickets + " on " + prefNight + " and your seating is :" + seating + "<br /> <br />" + "The total cost of your order will be: $" + cost);
        document.getElementById('OrderInput').innerHTML = OrderInput; //This prints the users details to a html element.
        document.getElementById('orderErrorMsg').innerHTML = ''; //Removes error messages when everything is correct.
    }
    return true;
}

只是快速提醒我要做什么：

我需要将座位变量值打印到订单输入的变量中。

这个座位变量需要是"下层区域"、"一级"、"阳台"或"二级"取决于他们点击的内容（选项）