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smoothScroll_uncompressed.js
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/*--------------------------------------------------------------------------*
*
* SmoothScroll JavaScript Library V2 modified by mi73
* Inner scroll with Easing curve
* document.smoothScroll(element|idName) is Available in external scope.
*
* MIT-style license.
*
* ＠originalAuthor Kazuma Nishihata
* ＠modifier Yohei Minami
* @access public
* @facebook yohei.minami
* @twitter mi73
* @modifier 2012/10/18
* @version 0.0.1
*--------------------------------------------------------------------------*/
(function (_document) {
var
// scroll seconds (millsecond)
// スクロールにかかる時間を設定(ミリ秒)
scrollDulation = 1000,
// Easing Curve Function. The list is below. RECOMMEND : easeOutQuart
// イージングカーブタイプ 一覧は下の方にあります。 オススメ : easeOutQuart
animationType = "easeOutQuart",
// Default interval time is 6ms
// タイマーインターバルは6ミリ秒としています。
stepMs = 6,
//attr = "data-for-smoothScroll", // if you can't use html5 , this value change "class"
attr = "class", //for html5
// If you don't need, set class or data-for-smoothScroll "noSmooth"
// 必要ない要素には、classまたはdata-for-smoothScroll属性にnoSmoothとセットしてください。
attrPatt = /noSmooth/,
d = document, //document short cut
easingFunction; //Easing Function
function addEvent(elm, listener, fn) {
try { // IE
elm.addEventListener(listener, fn, false);
} catch (e) {
elm.attachEvent(
"on" + listener
, function () {
fn.apply(elm, arguments)
}
);
}
}
function SmoothScroll(a) {
var e, end, docHeight, winHeight, start, flag, hashing;
//a tag
if (a.rel) {
if (d.getElementById(a.rel.replace(/.*\#/, ""))) {
e = d.getElementById(a.rel.replace(/.*\#/, ""));
} else {
return;
}
// name of id
} else if (typeof a == "string") {
e = d.getElementById(a)
// element itself
} else {
e = a;
}
end = e.offsetTop;
if (navigator.userAgent.indexOf('Android') > 0 && end == 0) end = 2;
docHeight = d.documentElement.scrollHeight;
winHeight = window.innerHeight || d.documentElement.clientHeight;
if (docHeight - winHeight < end) {
end = docHeight - winHeight;
}
start = window.pageYOffset || d.documentElement.scrollTop || d.body.scrollTop || 0;
flag = (end < start) ? "up" : "down";
hashing = function () {
if (typeof a == "string")location.hash = a;
};
function scrollMe(start, end, flag, step) {
setTimeout(
function () {
if (scrollDulation <= step) {
window.scrollTo(0, end);
hashing();
} else if (flag == "up" && start >= end) {
target = start - (start - end) * ( easingFunction[animationType](step, 0, 1, scrollDulation) );
window.scrollTo(0, target);
scrollMe(start, end, flag, step + stepMs);
} else if (flag == "down" && start <= end) {
target = start + (end - start) * ( easingFunction[animationType](step, 0, 1, scrollDulation) );
window.scrollTo(0, target);
scrollMe(start, end, flag, step + stepMs);
}
return;
}
, stepMs
);
}
scrollMe(start, end, flag, 0);
}
/*
*Add SmoothScroll
-------------------------------------------------*/
addEvent(window, "load", function () {
var anchors = d.getElementsByTagName("a");
for (var i = 0 , len = anchors.length; i < len; i++) {
if (!attrPatt.test(anchors[i].getAttribute(attr)) &&
anchors[i].href.replace(/\#[a-zA-Z0-9_]+/, "") == location.href.replace(/\#[a-zA-Z0-9_]+/, "")) {
anchors[i].rel = anchors[i].href;
anchors[i].href = "javascript:void(0)";
anchors[i].onclick = function () {
SmoothScroll(this)
}
}
}
});
/*
*Easing Function for scroll from jquery easing
-------------------------------------------------*/
// t: current time, b: begInnIng value, c: change In value, d: duration
easingFunction = {
easeInQuad:function (t, b, c, d) {
return c * (t /= d) * t + b;
},
easeOutQuad:function (t, b, c, d) {
return -c * (t /= d) * (t - 2) + b;
},
easeInOutQuad:function (t, b, c, d) {
if ((t /= d / 2) < 1) return c / 2 * t * t + b;
return -c / 2 * ((--t) * (t - 2) - 1) + b;
},
easeInCubic:function (t, b, c, d) {
return c * (t /= d) * t * t + b;
},
easeOutCubic:function (t, b, c, d) {
return c * ((t = t / d - 1) * t * t + 1) + b;
},
easeInOutCubic:function (t, b, c, d) {
if ((t /= d / 2) < 1) return c / 2 * t * t * t + b;
return c / 2 * ((t -= 2) * t * t + 2) + b;
},
easeInQuart:function (t, b, c, d) {
return c * (t /= d) * t * t * t + b;
},
easeOutQuart:function (t, b, c, d) {
return -c * ((t = t / d - 1) * t * t * t - 1) + b;
},
easeInOutQuart:function (t, b, c, d) {
if ((t /= d / 2) < 1) return c / 2 * t * t * t * t + b;
return -c / 2 * ((t -= 2) * t * t * t - 2) + b;
},
easeInQuint:function (t, b, c, d) {
return c * (t /= d) * t * t * t * t + b;
},
easeOutQuint:function (t, b, c, d) {
return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
},
easeInOutQuint:function (t, b, c, d) {
if ((t /= d / 2) < 1) return c / 2 * t * t * t * t * t + b;
return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;
},
easeInSine:function (t, b, c, d) {
return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
},
easeOutSine:function (t, b, c, d) {
return c * Math.sin(t / d * (Math.PI / 2)) + b;
},
easeInOutSine:function (t, b, c, d) {
return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
},
easeInExpo:function (t, b, c, d) {
return (t == 0) ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;
},
easeOutExpo:function (t, b, c, d) {
return (t == d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;
},
easeInOutExpo:function (t, b, c, d) {
if (t == 0) return b;
if (t == d) return b + c;
if ((t /= d / 2) < 1) return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;
},
easeInCirc:function (t, b, c, d) {
return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
},
easeOutCirc:function (t, b, c, d) {
return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
},
easeInOutCirc:function (t, b, c, d) {
if ((t /= d / 2) < 1) return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;
return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
},
easeInElastic:function (t, b, c, d) {
var s = 1.70158;
var p = 0;
var a = c;
if (t == 0) return b;
if ((t /= d) == 1) return b + c;
if (!p) p = d * .3;
if (a < Math.abs(c)) {
a = c;
var s = p / 4;
}
else var s = p / (2 * Math.PI) * Math.asin(c / a);
return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
},
easeOutElastic:function (t, b, c, d) {
var s = 1.70158;
var p = 0;
var a = c;
if (t == 0) return b;
if ((t /= d) == 1) return b + c;
if (!p) p = d * .3;
if (a < Math.abs(c)) {
a = c;
var s = p / 4;
}
else var s = p / (2 * Math.PI) * Math.asin(c / a);
return a * Math.pow(2, -10 * t) * Math.sin((t * d - s) * (2 * Math.PI) / p) + c + b;
},
easeInOutElastic:function (t, b, c, d) {
var s = 1.70158;
var p = 0;
var a = c;
if (t == 0) return b;
if ((t /= d / 2) == 2) return b + c;
if (!p) p = d * (.3 * 1.5);
if (a < Math.abs(c)) {
a = c;
var s = p / 4;
}
else var s = p / (2 * Math.PI) * Math.asin(c / a);
if (t < 1) return -.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p) * .5 + c + b;
},
easeInBack:function (t, b, c, d) {
var s = 1.70158;
return c * (t /= d) * t * ((s + 1) * t - s) + b;
},
easeOutBack:function (t, b, c, d) {
var s = 1.70158;
return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
},
easeInOutBack:function (t, b, c, d) {
var s = 1.70158;
if ((t /= d / 2) < 1) return c / 2 * (t * t * (((s *= (1.525)) + 1) * t - s)) + b;
return c / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2) + b;
},
easeInBounce:function (t, b, c, d) {
return c - this.easeOutBounce(d - t, 0, c, d) + b;
},
easeOutBounce:function (t, b, c, d) {
if ((t /= d) < (1 / 2.75)) {
return c * (7.5625 * t * t) + b;
} else if (t < (2 / 2.75)) {
return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b;
} else if (t < (2.5 / 2.75)) {
return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
} else {
return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
}
},
easeInOutBounce:function (t, b, c, d) {
if (t < d / 2) return this.easeInBounce(t * 2, 0, c, d) * .5 + b;
return this.easeOutBounce(t * 2 - d, 0, c, d) * .5 + c * .5 + b;
}
};
// for external execution
document.smoothScroll = SmoothScroll;
}(document));