jquery each function not working in sharepoint -

in order center of excel app web parts on sharepoint 2013 sp1 page, thought use jquery so. tried following code handle horizontal centering. unfortunately function seems never called.

i expect 9 alert() since there 9 divs on page matching selector. in other words there 9 divs class="ewr-sheetcontainer ewr-grdblkcontainer ewa-scrollbars". yes has 3 classes , css allows type of selection maybe jquery not.

this code embedded on page , jquery enabled site collection.

does see problem script, function, or way each called? goal adjust left attribute selected div.

<script type="text/javascript">  $(document).ready(function() {      $("div.ewr-sheetcontainer ewr-grdblkcontainer ewa-scrollbars").each( function () {         this.css("position","absolute");         this.css("left", math.max(0, (($(window).width() - $(this).outerwidth()) / 2) +                                                      $(window).scrollleft()) + "px");         alert("hello");         return this;     } );  });  

</script>

try this, seem missed dots specifying classes.

$(document).ready(function() {      $("div.ewr-sheetcontainer .ewr-grdblkcontainer .ewa-scrollbars").each( function () {         this.css("position","absolute");         this.css("left", math.max(0, (($(window).width() - $(this).outerwidth()) / 2) + $(window).scrollleft()) + "px");         alert("hello");         return this;     });  });