hide complete ribbon in dialog box using jquery

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

<script type="text/javascript">

_spBodyOnLoadFunctionNames.push("hideItAll");

function hideItAll(){
 if(window.location.search.toLowerCase().indexOf("isdlg=1") > 0){
 $("#s4-ribbonrow").hide(); //ribbon bar
 }
}
</script>