how do change inline style opacity on ajax success call?

Question

how do change inline style opacity on ajax success return call

 

<td class="prgTickMark">
<span id='subchk-281' style="opacity:0;position:relative;left:3px;color:#37589d;font-size:18px" class="glyphicon glyphicon-ok"></span>
</td>

 

What i did was

$(this).parents(".ddlparent").find('.prgTickMark').css("opacity", "1");

 

but it did not work