我正在學習jquery，我正在練習並堅持要獲得選定的選項值

Question

我對select元素有一個onchange屬性，我想在另一個函數中獲取所選選項的值，我該如何得到它？ 提前致謝。 這裏是我的html

<div class="col-lg-6 col-md-6 col-sm-6 col-xs-12"> 
     <div class="form-group"> 
     <select class="form-control" name="country" id="country" onChange="stateChange(this.value)"> 
     <option>SELECT COUNTRY</option> 
      //all countries name like bellow 
      <option value="USA"> USA </option> 
................ 
      </select> 
     </div> 
     </div> 
    <div class="col-lg-6 col-md-6 col-sm-6 col-xs-12"> 
    <div class="form-group"> 
    <select class="form-control" name="city" id="state"> 
     <option>SELECT CITY</option> 
     </select> 
     </div> 
    </div> 
<div class="form-group btn-field"> 
    <div class="row"> 
     <div class="col-sm-12"> 
      <input type="submit" id="create-account" tabindex="4" class="form-control btn btn-login" value="CREATE ACCOUNT"> 
     </div> 
    </div> 
</div> 

stateChange工作完美，但我想在波紋管的功能得到這個，它總是返回選項1這裏＃創建帳戶是一個按鈕的id

$('#create-account').click(function (e) { 

      var country = $('#country option:selected').text(); 
      alert(country); 

     }); 



var country_arr = new Array("Afghanistan", "Albania",........); 

// States 
var s_a = new Array(); 
s_a[0]=""; 
s_a[1]="Badakhshan|Badghis|Baghlan|Balkh|Bamian|Farah|Faryab|Ghazni|Ghowr|Helmand|Herat|Jowzjan|Kabol|Kandahar|Kapisa|Konar|Kondoz|Laghman|Lowgar|Nangarhar|Nimruz|Oruzgan|Paktia|Paktika|Parvan|Samangan|Sar-e Pol|Takhar|Vardak|Zabol"; 
s_a[2]="Berat|Bulqize|Delvine|Devoll (Bilisht)|Diber (Peshkopi)|Durres|Elbasan|Fier|Gjirokaster|Gramsh|Has (Krume)|Kavaje|Kolonje (Erseke)|Korce|Kruje|Kucove|Kukes|Kurbin|Lezhe|Librazhd|Lushnje|Malesi e Madhe (Koplik)|Mallakaster (Ballsh)|Mat (Burrel)|Mirdite (Rreshen)|Peqin|Permet|Pogradec|Puke|Sarande|Shkoder|Skrapar (Corovode)|Tepelene|Tirane (Tirana)|Tirane (Tirana)|Tropoje (Bajram Curri)|Vlore"; 
......... 
function populateStates(countryElementId, stateElementId){ 

    var selectedCountryIndex = document.getElementById(countryElementId).selectedIndex; 

    var stateElement = document.getElementById(stateElementId); 

    stateElement.length=0; // Fixed by Julian Woods 
    stateElement.options[0] = new Option('Select State',''); 
    stateElement.selectedIndex = 0; 

    var state_arr = s_a[selectedCountryIndex].split("|"); 

    for (var i=0; i<state_arr.length; i++) { 
     stateElement.options[stateElement.length] = new Option(state_arr[i],state_arr[i]); 
    } 
} 

function stateChange(country) { 
    for(var pos=0;pos<=country_arr.length;pos++) 
    { 
     if (country==country_arr[pos]) 
     { 
      break; 
     } 
    } 
    ++pos; 
    if(pos<253) 
    { 
     populateState(pos); 
    } 

} 
function populateState(countryId) 
{ 
    var state_arr = s_a[countryId].split("|"); 

    var select = document.getElementById('state'); 

    for(var s = select.options.length - 1 ; s >= 0 ; s--) 
    { 
     select.remove(s); 
    } 
    for (var i = 0; i<state_arr.length; i++){ 
     var opt = document.createElement('option'); 
     opt.value = state_arr[i]; 
     opt.innerHTML = state_arr[i]; 
     select.appendChild(opt); 
    } 

} 

Answer 1

編輯：問題是你的國家變量是在你的點擊功能中定義的。它不是存在的。所以你需要做的是在全球範圍內的javascript代碼頂部聲明國家變量，如

 var country=""; 

     $('#create-account').click(function (e) { 
     country = $('#country option:selected').text(); 
     alert(country); 

     }); 

這是你想要的嗎？爲了顯示值而不是文本？在這種情況下，你只需要得到選擇標記，並與.VAL運行它（）來獲取值

$('#create-account').click(function (e) { 
 

 
      var country = $('#country').val(); 
 
      alert(country); 
 

 
     });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<select class="form-control" name="country" id="country" > 
 
     <option value="1">Option 1</option> 
 
     <option value="2">Option 2</option> 
 
     <option value="3">Option 3</option> 
 
     <option value="4">Option 4</option> 
 
</select> 
 

 
<button id="create-account">click</button>