JavaScript的alert（下拉列表）

Question

我有非常有限的JavaScript知识，需要一些帮助，请：

我有以下功能：

$('#addDialog').dialog({ 
     autoOpen: false, 
     width: 500, 
     buttons: { 
      "Add": function() { 

       //alert("sent:" + addStartDate.format("dd-MM-yyyy hh:mm:ss tt") + "==" + addStartDate.toLocaleString()); 
       var eventToAdd = { 
        //title: $("#addEventName").val(), 
        title: $("#addEventSalesPerson option:selected").text(), 
        description: $("#addEventDesc").val(), 
        start: addStartDate.format("dd-MM-yyyy hh:mm:ss tt"), 
        end: addEndDate.format("dd-MM-yyyy hh:mm:ss tt"), 
        salesperson: $("#addEventSalesPerson option:selected").text(), 
        eventPostCode: $("input[id$=addEventPostCode]").val(), 
        eventname: $("#addEventEventName option:selected").text() 
       }; 

       if ($("input[id$=addEventPostCode]").val().length < 5) { 
        alert("Post code cannot be blank and must contain a minimum of 5 characters"); 

       } 

       else { 
        //alert("sending " + eventToAdd.title); 

        PageMethods.addEvent(eventToAdd, addSuccess); 
        $(this).dialog("close"); 
       } 

      } 

     } 
    }); 

#addEventEventName是填充的DDL SQL并有几个选项。目前，如果"input[id$=addEventPostCode]"少于5个字符，则会发出警报。

我需要的是，如果选择的选项假日或疾病那么它不会显示一个警告。谢谢

更新 我试着按@戴维的建议添加下面的行，但仍然没有喜悦 - 任何接受者？

if ($("input[id$=addEventPostCode]").val().length < 5 && !($("#addEventSalesPerson option:selected").text() == "Holiday" || $("#addEventSalesPerson option:selected").text() == "Sickness")) { 

Answer 1

更改以下行

if ($("input[id$=addEventPostCode]").val().length < 5) { 

到

if ($("input[id$=addEventPostCode]").val().length < 5 && !($("#addEventSalesPerson option:selected").text() == "Holiday" || $("#addEventSalesPerson option:selected").text() == "Sickness")) { 

它应该如果只警告不放假或疾病

! //This is Not 
(//Parenthesis group expressions together so the not works on the result of the expressions inside 
$("#addEventSalesPerson option:selected").text() == "Holiday" //This checks if selected text matches string 
|| //This means Or 
$("#addEventSalesPerson option:selected").text() == "Sickness" //This checks if selected text matches string 
) 

如果任何字符串匹配结果将是错误的，我f不会触发警报。