jquery - Javascript auto-scroll up and down, cancel at any time -

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i have website button. when press button, want page (body) auto-scroll , down forever.

until try scroll page myself, auto-scroll must stop until restarted button.

i've found alot of posts on how auto-scroll - not in context, being able stop it.

any ideas?

hi can inspire example link

<div id="listofstuff">     <div class="anitem">        <span class="itemname">item1</span>        <span class="itemdescruption">aboutitem1</span>     </div>     <div class="anitem">        <span class="itemname">item2</span>        <span class="itemdescruption">aboutitem2</span>     </div>     <div class="anitem">        <span class="itemname">item3</span>        <span class="itemdescruption">aboutitem3</span>     </div>     <div class="anitem">        <span class="itemname">item4</span>        <span class="itemdescruption">aboutitem5</span>     </div>     <div class="anitem">        <span class="itemname">item5</span>        <span class="itemdescruption">aboutitem5</span>     </div> </div>

and 

$(document).ready(function() {     var wrapper = $('#listofstuff'),     element = wrapper.find('.anitem'),     lastelement = wrapper.find('.anitem:last-child'),     lastelementtop = lastelement.position().top,     elementsheight = element.outerheight(),     scrollamount = lastelementtop - 2 * elementsheight;      $('#listofstuff').animate({         scrolltop: scrollamount     }, 1000, function() {         lastelement.addclass('current-last');     }); });

and

.anitem {     height:58px;     background:#eee;     border-top: 1px solid #bbb;     border-bottom: 1px solid #fff;     padding:20px;     color:000;     font-family: helvetica,arial, verdana,sans-serif;     -webkit-transition: 1000ms; } .anitem.current-last{     background: #99d; } #listofstuff {     width:300px;     height:300px;     overflow:auto; }

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