使用 <select>帶有轉換語句的標簽（Java和HTML）

Question

我正在為游戲創建一個計算器，並且想使用下拉菜單在switch語句中選擇一個值； 盡管它似乎不起作用，但始終返回0。有人可以看到我出了錯嗎？ 另外，我對Java和html還是很陌生，所以如果出現愚蠢的錯誤，我們深感抱歉。

http://jsfiddle.net/1r177khr/

這是我的html：

<form onsubmit="return calcDarkTroops(0);" style="display: inline;">
<!-- Title of Form /--> <font>Level</font> 
<!-- Gets Input /-->
<select id="minionlevel_input">
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
    <option>5</option>
    <option>6</option>
</select>
<!-- Calls 'calcDarkTroops' /-->
<input type="button" value="Calculate" onclick="calcDarkTroops();">
<!-- Outputs result /--> <span id="minioncost_result"> = 0 Dark Elixer</span>

這是我的Java：

calcDarkTroops = function () {
 var minionlevel = Number(document.getElementById("minionlevel_input").value);
 String maxString;
 switch (minionlevel) {
     case 1:
         maxString = "200,000";
         break;
     case 2:
         maxString = "190,000";
         break;
     case 3:
         maxString = "170,000";
         break;
     case 4:
         maxString = "140,000";
         break;
     case 5:
         maxString = "100,000";
         break;
     case 6:
         maxString = "0";

     document.getElementById("minioncost_result").innerHTML = "= " + Math.round(maxString * 100) / 100 + " Dark Elixer";

                        }

Answer 1

嘗試為您的選擇選項提供value屬性，並考慮提供默認選項，

<select id="minionlevel_input">
    <option value="0">Select</option>
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
    <option value="5">5</option>
    <option value="6">6</option>
</select>

小提琴

Answer 2

嘗試這個：

<form style="display: inline;">
<!-- Title of Form /--> <font>Level</font> 
<!-- Gets Input /-->
<select id="minionlevel_input">
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
    <option>5</option>
    <option>6</option>
</select>
<!-- Calls 'calcDarkTroops' /-->
<input type="button" value="Calculate" onclick="return calcDarkTroops(document.getElementById('minionlevel_input').value)">
<!-- Outputs result /--> <span id="minioncost_result"> = 0 Dark Elixer</span>

<script>
 function calcDarkTroops(minionlevel) {
   var maxString;
   switch (minionlevel) {
     case '1':
         maxString = "200,000";
         break;
     case '2':
         maxString = "190,000";
         break;
     case '3':
         maxString = "170,000";
         break;
     case '4':
         maxString = "140,000";
         break;
     case '5':
         maxString = "100,000";
         break;
     case '6':
         maxString = "0";
         break;    
   }
     document.getElementById("minioncost_result").innerHTML = "= " + Math.round(parseInt(maxString) * 100) / 100 + " Dark Elixer";

}

看到這個小提琴