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Add scroller as an option #11

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Add scroller as an option #11

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12 changes: 7 additions & 5 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -21,9 +21,11 @@ module.exports = scrollTo;

function scrollTo(x, y, options) {
options = options || {};

var scroller = options.scroller || window;

// start position
var start = scroll();
var start = scroll(scroller);

// setup tween
var tween = Tween(start)
Expand All @@ -33,7 +35,7 @@ function scrollTo(x, y, options) {

// scroll
tween.update(function(o){
window.scrollTo(o.left | 0, o.top | 0);
scroller.scrollTo(o.left | 0, o.top | 0);
});

// handle end
Expand All @@ -59,8 +61,8 @@ function scrollTo(x, y, options) {
* @api private
*/

function scroll() {
var y = window.pageYOffset || document.documentElement.scrollTop;
var x = window.pageXOffset || document.documentElement.scrollLeft;
function scroll(scroller) {
var y = scroller.scrollTop || window.pageYOffset;
var x = scroller.scrollLeft || window.pageXOffset;
return { top: y, left: x };
}