DOM manipulation - to hide element when particular class exist

Question

To flag

<?php 
if ($node->uid == "65632") { 
  $newlaunches = "newlaunchpage"; 
}
?>

 

To add class on DOM

<div class="sticky-prop-header detail-header hidden-m <?php echo $newlaunches; ?>">

 

To addClass & hide

if ($(".sticky-prop-header").hasClass('newlaunchpage')) {
  $('body').addClass('newlaunches'); 
}

if($('body').hasClass('newlaunches')) {
  $('.float-agent-contact').hide();
}