<script type="text/javascript">
function SearchValidation(){	
   function trim(str){				
	 return str.replace(/^\s*|\s*$/g,'');
	}	
if(trim(document.getElementById('searchtext').value)==0){		
alert("Please enter search keyword !");
document.getElementById('searchtext').focus();
return false;
 }	
}
</script>
<div class="extra-nav">
  <div class="extra-cell">
    <button id="quik-search-btn" type="button" class="site-button"><i class="fa fa-search"></i></button>
  </div>
</div>
<div class="dlab-quik-search bg-primary">
  <form action="<?=$site_url?>/search-result.php" method="get" onSubmit="return SearchValidation();">
    <input name="searchtext" id="searchtext" type="text" class="form-control" placeholder="Enter search keyword & Hit enter">
    <span id="quik-search-remove"><i class="fa fa-remove"></i></span>
  </form>
</div>