帶有jQuery的單選按鈕檢查

Question

什麼是循環瀏覽我的頁面上所有單選按鈕的最佳方式，並提醒用戶其中某個按鈕是否針對特定問題未選中？

注意：一頁上有多個問題。

<li> 
    <fieldset> 
    <h3>What music do you listen to?</h3> 

     <ul class="answerList"> 
      <li> 
       <input type="radio" id="choice_22" name="answer8" value="1" class=""/> 
       <label for="choice_22" class="">Heavy Metal </label> 
      </li> 
      <li> 
       <input type="radio" id="choice_23" name="answer8" value="2" class=""/> 
       <label for="choice_23" class="">Pop music</label> 
      </li> 
      <li> 
       <input type="radio" id="choice_24" name="answer8" value="3" class=""/> 
       <label for="choice_24" class="">Oh, a mix of stuff </label> 
      </li> 
     </ul> 
     </fieldset> 
     </li> 

Answer 1

嘗試這些：

Find all radio groups which haven't been selected Validation of radio button group using jQuery validation plugin

Answer 2

if (undefined === $("input[name='answer8']:checked").val()) { 
    // do something 
}