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<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  
  <div id="arrowlink">ARROW LINK</div>
  
  Please set: 
  <select name="bg">
    <option value="">Background</option>
    <option value="red">red</option>
    <option value="green">green</option>
    <option value="blue">blue</option>    
  </select>
  
  <select name="color">
    <option value="">Color</option>
    <option value="red">red</option>
    <option value="green">green</option>
    <option value="blue">blue</option>    
  </select>
​
  
  
  
</body>
</html>
 
.bg-red{  
  background:red; 
}
.bg-blue{  
  background:blue; 
}
.bg-green{  
  background:green; 
}
​
.color-red{  
  color:red; 
}
.color-blue{  
  color:blue; 
}
.color-green{  
  color:green; 
}
 
function createClasses( element ){
  var classesArr = [];
  $('select').each(function(){
     var myVal  = this.value ;
     if(myVal.length) classesArr.push( this.name +'-'+ this.value );
  });
  console.log(classesArr);  
  $(element).attr('class', classesArr.join(' ') );
}
​
​
​
$("select").on("change", function(){
    createClasses( "#arrowlink" );
});
Output 300px

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