javascript - Detect element is at the top of its parent - jQuery -

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I am doing trinx to create a simple content scroller.

On my UTONE click I have a div up and down 15 pixels of my parents, even if its id on top, to disable this function, what is the best way to do this?

JSFIDDLE

jQUERY 

  $ ('Up'). Click (function (e) {e.preventDefault (); $ (this) .Parent (). ('Internal-scrolling'). CSS ({marginopt: '- = 15px'});} ); $ ('Down'). Click (function (e) {e.preventDefault (); $ (this). Parent (). ('Internal-scroll'). Css ({marginTop: '+ = 15px'});});    
 
 
 Instead of using margins, why do you use  scrollTop  
 The browser will note that the values ​​should be less than 0 or less than the upper bound.  
  $ ('up') (function (e) {e.preventDefault (); var s = $ (this). Parent (). Prev (); s.scrollTop ( S.scrollTop () - 15);}); Click $ ('down') (function (e) {e.preventDefault (); var s = $ (this) parent (). Prev (); s.scrollTop (s.scrollTop () + 15);} );

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