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Made options for scrollLeft and fix callback bug #11

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Made options for scrollLeft and fix callback bug #11

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740b192
add option for use with horizontal scrolling
yanawaro Jun 30, 2016
f8fd12d
fix callback doesn’t call if target scroll exceeds scrollWidth
yanawaro Jun 30, 2016
bb48628
add docs for horizontal scrolling
yanawaro Jun 30, 2016
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1 change: 1 addition & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ button.addEventListener('click', function () {
document.body, // element to scroll with (most of times you want to scroll with whole <body>)
0, // target scrollY (0 means top of the page)
10000, // duration in ms
true, // horizontal scrolling?
function() { // callback function that runs after the animation (optional)
console.log('done!')
}
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18 changes: 11 additions & 7 deletions animatedScrollTo.js
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Expand Up @@ -8,35 +8,39 @@
return -c/2 * (t*(t-2) - 1) + b;
};

var animatedScrollTo = function (element, to, duration, callback) {
var start = element.scrollTop,
var animatedScrollTo = function (element, to, duration, scrollLeft, callback) {

var direction = 'scrollTop'
if (scrollLeft) direction = 'scrollLeft'

var start = element[direction],
change = to - start,
animationStart = +new Date();
var animating = true;
var lastpos = null;

var animateScroll = function() {
if (!animating) {
if (callback) { callback(); }
return;
}
requestAnimFrame(animateScroll);
var now = +new Date();
var val = Math.floor(easeInOutQuad(now - animationStart, start, change, duration));
if (lastpos) {
if (lastpos === element.scrollTop) {
if (lastpos === element[direction]) {
lastpos = val;
element.scrollTop = val;
element[direction] = val;
} else {
animating = false;
}
} else {
lastpos = val;
element.scrollTop = val;
element[direction] = val;
}
if (now > animationStart + duration) {
element.scrollTop = to;
element[direction] = to;
animating = false;
if (callback) { callback(); }
}
};
requestAnimFrame(animateScroll);
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