jquery fixed floating sidebar (jquery fixed Sidebar)

This function is now widely used, if the page is relatively high, when the scroll bar dragged down to the bottom of the page, the sidebar will appear a fixed following the browser Div box, is the idea is this: first get the div need to follow the distance from the top of the page, and then judge, When the browser scrolls more than the distance from the top of the div itself, add the CSS property fixed.

This function is now widely used, if the page is relatively high, when the scroll bar dragged down to the bottom of the page, the sidebar will appear a fixed following the browser Div box, is the idea is this: first get the div need to follow the distance from the top of the page, and then judge, When the browser scrolls more than the distance from the top of the div itself, add the CSS property fixed.

The code is as follows

HTML code: <div id= "Header" >header</div> <div id= "Sidebarwrap" > <div id= "sidebar" >Sidebar</div> </div> <div id= "main" >Main</div> <div id= "Footer" >footer</div> CSS code: Body {     margin:10px auto;     Font-family:sans-serif;     width:500px; } Div {     border-radius:5px     box-shadow:1px 2px 5px rgba (0,0,0,0.3) ;     border:1px solid #ccc;     padding:5px; } #sidebarWrap {     height:400px;     width:210px   & nbsp Float:right;     position:relative;     Box-shadow:none;     Border:none;     margin:0;     padding:0; } #main {     width:270px;     height:4000px; } #footer {     clear:both     margin:10px 0; } #sidebar {     width:200px     height:300px;     Positionabsolute; } #header {     height:200px;     margin-bottom:10px; } #sidebar. Fixed {     position:fixed     top:0; } #footer {height:600px;} #footer {height:600px;} JavaScript code: $ (function () { var top = $ (' #sidebar '). Offset (). Top-parsefloat ($ (' #sidebar '). CSS (' margintop '). Replace (/auto/, 0)); var foottop = $ (' #footer '). Offset (). Top-parsefloat ($ (' #footer '). CSS (' margintop '). Replace (/auto/, 0)); var Maxy = foottop-$ (' #sidebar '). Outerheight ();     $ (window). Scroll (function (evt) {         var y = $ (this) . scrolltop ();         if (Y > top) {              if (Y < Maxy) {                  $ (' #sidebar '). addclass (' fixed '). Removeattr (' style ');            } else {                  $ (' #sidebar '). Removeclass (' fixed '). css ({                      Position: ' absolute ',                      Top: (maxy-top) + ' px '                 });            }        } else {              $ (' #sidebar '). Removeclass (' fixed ');        }    }); });