find div within parent div by parent div class in jquery

http://stackoverflow.com/questions/24830356/find-div-within-parent-div-by-parent-div-class-in-jquery

HTML

<div class="noUi-handle noUi-handle-lower">
<div id="divQuestionresponseContainer_0">
  <div1 id="divQuestionresponseContainer_0$QRC1">
    <div id="divinnerQuestionDetails1" class="div1">
       <span class=""></span>
    </div>
  </div1>
  <div2 id="divQuestionresponseContainer_0$QRC2">
    <div  id="divinnerQuestionDetails2" class="div2">
       <span class="requiredTxt"></span>
    </div>
    <div  id="divinnerQuestion" class="div2">
       <span ></span>
    </div>
  </div2>
  <div3 id="divQuestionresponseContainer_0$QRC3">
    <div id="divinnerQuestionDetails3" class="div3">
       <span class="requiredTxt"></span>
    </div>
  </div3>
</div>
</div>

CSS

div {
    background-color:gray;
    display:block;
    float:left;
    height:50px;
    width:50px;
}

div1 {
    background-color:red;
    display:block;
    float:left;
    height:50px;
    width:500px;
}
div2 {
    background-color:yellow;
    display:block;
    float:left;
    height:50px;
    width:500px;
}
div3 {
    background-color:black;
    display:block;
    float:left;
    height:50px;
    width:500px;
}
.mushrooms {
    background-color:green;
}

.requiredTxt
{
  background-color:green;
}

JavaScript

function pizzaToppings() {
  
  var mandatoryQ=$(obj).find('.requiredTxt').parent('div');
  $("#mandatoryQ").each(function (key, obj) {
 

  alert($(obj).attr('id'));
    
 //var mandatory=$(obj).find("div[id^='_divinnerQuestionDetails_']");
    //   alert(mandatory.attr('id'));
     
   
     });
}
  


$('.noUi-handle').on('click', pizzaToppings);