javascript - iScroll move header up or down while scrolling -


i trying build function moves header 45px while scrolling down , reverse. should facebook header mobile app, or address-bar of chrome mobile browser or safari mobile browser. using scrolling iscroll plugin , managed let header moving while scrolling down , moving down again while scrolling up. not working. stuck while scrolling.

this js code:

function updateposition () {         var wrapperposition         = this.y;         var laststopposition        = $('#header').attr('data-last-value');         var distance                = wrapperposition - laststopposition;          var getmatrixstyle          = window.getcomputedstyle($('#header').get(0));         var getmatrix               = new webkitcssmatrix(getmatrixstyle.webkittransform);         var matrixpositionheader    = getmatrix.m42;          var moveup                  = matrixpositionheader - 1;         var movedown                = matrixpositionheader + 1;          if(wrapperposition >= -45 && wrapperposition <= 0 && distance < 0) {             $('#header').css({ '-webkit-transform' : 'translate(0,' + wrapperposition + 'px)' });         }          else if(wrapperposition <= -46 && distance < 0) {             $('#header').css({ '-webkit-transform' : 'translate(0,-45px)' });         }          else if(wrapperposition <= -46 && distance > 0) {             if(matrixpositionheader <= -1){                 $('#header').css({ '-webkit-transform' : 'translate(0,' + movedown + 'px)' });             }              else if(matrixpositionheader == 0){                 $('#header').removeattr('style');             }         }          else if(distance > 0 && distance <= 45){             if(matrixpositionheader <= -1){                 $('#header').css({ '-webkit-transform' : 'translate(0,' + movedown + 'px)' });             }              else if(matrixpositionheader == 0){                 $('#header').removeattr('style');             }         }          writeposition.innerhtml     = this.y>>0;         writeposition3.innerhtml    = distance;     }      function scrollstart() {         var getmatrixstyle          = window.getcomputedstyle($('#innerwrapper').get(0));         var getmatrix               = new webkitcssmatrix(getmatrixstyle.webkittransform);         var matrixpositionwrapper   = getmatrix.m42;          writeposition2.innerhtml    = matrixpositionwrapper;     }      function scrollend() {         var getmatrixstyle          = window.getcomputedstyle($('#innerwrapper').get(0));         var getmatrix               = new webkitcssmatrix(getmatrixstyle.webkittransform);         var matrixpositionwrapper   = getmatrix.m42;          $('#header').attr('data-last-value', matrixpositionwrapper);          writeposition4.innerhtml    = matrixpositionwrapper;     }      function loaded () {         var myscroll;         writeposition = document.getelementbyid('position');         writeposition2 = document.getelementbyid('position2');         writeposition3 = document.getelementbyid('position3');         writeposition4 = document.getelementbyid('position4');          myscroll = new iscroll('#wrapper', {                                               probetype: 3,                                               mousewheel: true,                                              speedratioy: 40                                             });          myscroll.on('scrollstart', scrollstart);         myscroll.on('scroll', updateposition);         myscroll.on('scrollend', scrollend);     }      document.addeventlistener('touchmove', function (e) { e.preventdefault(); }, false);

my html:

<div style="position:absolute; top: 110px;z-index:100; left: 120px;">innerwrapper y position: <strong id="position">0</strong> px</div>     <div style="position:absolute; top: 130px;z-index:100; left: 120px;">start position: <strong id="position2">0</strong> px</div>     <div style="position:absolute; top: 150px;z-index:100; left: 120px;">distance betweent start/stop position: <strong id="position3">0</strong> px</div>     <div style="position:absolute; top: 170px;z-index:100; left: 120px;">last stop position: <strong id="position4">0</strong> px</div>     <header id="header" role="banner" data-last-value="0">         <div class="header-main"></div>         <!-- end header main -->          <div class="header-bar"></div>         <!-- end header bar -->     </header>     <!-- end header -->      <div id="wrapper">          <div id="innerwrapper">             <ul>                 <li>content</li>                 .....             </ul>         </div>         <!-- end inner wrapper -->     </div>     <!-- end wrapper -->

here link testing: http://jsfiddle.net/bp9hy/1/

to see problem, try scroll few times , down stop scrolling in between (e.g. scroll 120px down , stop. scroll again).

thanks helping.


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