javascript - window.height and document.height returning the same value -


in following code, trying implement infinite scroll. problem encountering 'document.height' , 'window.height' returning me same value. can 1 me going wrong?

<html>     <head>         <script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>         <script type="text/javascript">         $(window).scroll(function(){             if($(window).scrolltop() == $(document).height() - $(window).height()){                 $('div#loadmoreajaxloader').show();                 $.ajax({                     url: "loadmore.php",                     success: function(html){                         if(html){                             $("#postswrapper").append(html);                             $('div#loadmoreajaxloader').hide();                             console.log($(document).height());                             console.log($(window).height());                         }else{                             $('div#loadmoreajaxloader').html('<center>no more posts show.</center>');                         }                     }                 });             }         });     </script>          <style>         body{ margin:0px; }          #wrapper{             width:600px;             margin:auto;         }         .spacer{             clear:both;             height:5px;         }         .txtarea{             font-size:18px;             height:50px;             width:100%;         }         #postswrapper{             border-bottom:1px dotted #555555;         }         .item{             border-top:1px dotted #555555;             padding:10px 5px;             font-size: 16px;         }         .item:hover{             background:#efefef;         }         #newpostlink{             display:block;text-align:center;border:2px solid #414141;background:#7d7d7d;color:#fff; margin: 0 0 10px;padding:5px; -moz-border-radius: 5px; -webkit-border-radius: 5px; border-radius: 5px;font-size:20px;text-decoration:none;         }     </style>       </head>      <body>                 <div id="wrapper">         <div id="postswrapper">          <p style="font-size:28px">infinite scroll demo 2</p>  <div class="item"> <p>lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod tempor incididunt ut labore et dolore magna aliqua. ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p> </div>  <div class="item"> <p>lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod tempor incididunt ut labore et dolore magna aliqua. ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p> </div>  <div class="item"> <p>lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod tempor incididunt ut labore et dolore magna aliqua. ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p> </div>  <div class="item"> <p>lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod tempor incididunt ut labore et dolore magna aliqua. ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p> </div>         </div>          <div id="loadmoreajaxloader" style="display:none;"><center><img src="ajax-loader.gif" /></center></div>      </div>  <div id="footer" style="display:inline-block;width:100%;padding:10px;background-color:#ffffff">   </div>      </body>    </html>

try maybe...

if ($(window).scrolltop() <= $(document).height() - $(window).height()) {

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