58 lines
1.6 KiB
JavaScript
58 lines
1.6 KiB
JavaScript
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// Fix DOM matches function
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if (!Element.prototype.matches) {
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Element.prototype.matches =
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Element.prototype.matchesSelector ||
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Element.prototype.mozMatchesSelector ||
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Element.prototype.msMatchesSelector ||
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Element.prototype.oMatchesSelector ||
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Element.prototype.webkitMatchesSelector ||
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function(s) {
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var matches = (this.document || this.ownerDocument).querySelectorAll(s),
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i = matches.length;
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while (--i >= 0 && matches.item(i) !== this) {}
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return i > -1;
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};
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}
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// Get Scroll position
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function getScrollPos() {
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var supportPageOffset = window.pageXOffset !== undefined;
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var isCSS1Compat = ((document.compatMode || "") === "CSS1Compat");
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var x = supportPageOffset ? window.pageXOffset : isCSS1Compat ? document.documentElement.scrollLeft : document.body.scrollLeft;
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var y = supportPageOffset ? window.pageYOffset : isCSS1Compat ? document.documentElement.scrollTop : document.body.scrollTop;
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return { x: x, y: y };
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}
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var _scrollTimer = [];
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// Smooth scroll
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function smoothScrollTo(y, time) {
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time = time == undefined ? 500 : time;
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var scrollPos = getScrollPos();
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var count = 60;
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var length = (y - scrollPos.y);
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function easeInOut(k) {
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return .5 * (Math.sin((k - .5) * Math.PI) + 1);
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}
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for (var i = _scrollTimer.length - 1; i >= 0; i--) {
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clearTimeout(_scrollTimer[i]);
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}
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for (var i = 0; i <= count; i++) {
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(function() {
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var cur = i;
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_scrollTimer[cur] = setTimeout(function() {
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window.scrollTo(
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scrollPos.x,
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scrollPos.y + length * easeInOut(cur/count)
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);
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}, (time / count) * cur);
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})();
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}
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}
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