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<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-2.2.4.js"></script>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<div>
  <fieldset>
    <p dir="rtl"><label>case1</label>
      <select  id="Color" required="required">
        <option>please select</option>
        <option value="redd">home</option>
        <option value="greenn">car</option>
      </select>
    </p>
  </fieldset>
</div>
​
<div class="redd box keepme">   
  <div>
    <fieldset>
      <p dir="rtl"><label>case2</label>
        <select  id="ddColor" required="required">
          <option>please select</option>
          <option value="red">sell</option>
          <option value="green">rent</option>
        </select>
      </p>
    </fieldset>
  </div>
  <div class="red box">red</div>
  <div class="green box">green</div>
</div>
<div class="greenn box">greenn</div>
</body>
</html>
 
​
$("#Color").change(function () {
  $(this).find("option:selected").each(function(){
    if($(this).attr("value")=="redd"){
      $(".box").not(".redd").hide();
        $(".redd").show();
    }
    else if($(this).attr("value")=="greenn"){
      $(".box").not(".greenn").hide();
      $(".greenn").show();
    }
    else{
      $(".box").hide();
    }
  });
}).change();
​
​
$("#ddColor").change(function () {              
  $(this).find("option:selected").each(function(){
    if($(this).attr("value")=="red"){
      $(".box").not(".red,.keepme").hide();
      $(".red").show();
    }
    else if($(this).attr("value")=="green"){
      $(".box").not(".green,.keepme").hide();
      $(".green").show();
    }
    else{
      $(".box").hide();
    }
  });
}).change();
Output 300px

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