單選按鈕選擇創建一個動態下拉列表

Question

我想創建一個下拉列表，該列表是根據在一組單選按鈕中進行的選擇動態填充的。我目前有一組單選按鈕名稱「適用性」，選擇的選項有：人員，程序，環境，交付能力，技術適航性和運營適航性。根據選擇哪一個，我希望下拉框中填充多個選項以供選擇。我目前使用的代碼是：

var peList = [「Worker Type」, 「Injury Type」]; 
var enList = [「Undefined」]; 
var prList = ["Facility", "Building", "Plant", "Damage Type"]; 
var caList = ["To Be Determined"]; 
var teList = ["Aircraft", "Component"]; 
var opList = ["Nothing at the moment"]; 

if (Applicability.rawValue===」People」) { 
      DropDownList4.clearItems; 
    for (var i = 0; i < peList.length; i++) { 
     DropDownList4.addItem(peList[i]); 
} 
     } else if (Applicability.rawValue===」Property」) { 
      DropDownList4.clearItems; 
    for (var i = 0; i < prList.length; i++) { 
     DropDownList4.addItem(prList[i]); 
     } 
     } else if (Applicability.rawValue===」Environment」) { 
      DropDownList4.clearItems; 
    for (var i = 0; i < enList.length; i++) { 
     DropDownList4.addItem(enList[i]); 
     } 
     } else if (Applicability.rawValue===」CapabilityToDeliver」) { 
      DropDownList4.clearItems; 
    for (var i = 0; i < caList.length; i++) { 
     DropDownList4.addItem(caList[i]); 
     } 
     } else if (Applicability.rawValue===」TechnicalAirworthiness」) { 
      DropDownList4.clearItems; 
    for (var i = 0; i < taList.length; i++) { 
     DropDownList4.addItem(taList[i]); 
     } 
     } else if (Applicability.rawValue===」OperationalAirworthiness」) { 
      DropDownList4.clearItems; 
    for (var i = 0; i < opList.length; i++) { 
     DropDownList4.addItem(opList[i]);} 

請問您可以通過向我展示我可能會出錯的地方來協助嗎？謝謝

Answer 1

clearitems是一種方法，應該被稱爲DropDownList4.clearItems（）;請注意這裏的代碼中缺少的括號。另外，通過使用開關使代碼更易於維護。例如：

var a,al,ax; // array, array length, array index 
switch(Applicability.rawValue){ 
case 'People': a=['Worker Type', 'Injury Type'];break; 
case 'Property': a=['Facility', 'Building', 'Plant', 'Damage Type'];break; 
case 'Environment': a=['Undefined'];break; 
case 'CapabilityToDeliver': a=['To Be Determined'];break; 
case 'TechnicalAirworthiness': a=['Aircraft', 'Component'];break; 
case 'OperationalAirworthiness': a=['Nothing at the moment'];break; 
default: 
// put your exception handling code here. 
} 
DropDownList4.clearItems(); 
for(ax=0,al=a.length;ax<al;ax++){ 
DropDownList4.addItem(a[ax]); 
}