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smooth scroll
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| // for jquery | |
| $( document ).ready(function() { | |
| $(".smoothScroll").on('click', function(e){ | |
| smoothScroll(e); | |
| }) | |
| }); |
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| window.jump = function(target, options) { | |
| options = options || {}; | |
| var t = document.querySelector(target); | |
| if (t == null) return; | |
| var start = window.pageYOffset, | |
| opt = { | |
| duration: options.duration || 100, | |
| offset: options.offset || 0, | |
| callback: options.callback, | |
| easing: options.easing || easeInOutQuad | |
| }, | |
| distance = typeof target === 'string' | |
| ? opt.offset + t.getBoundingClientRect().top | |
| : target, | |
| duration = typeof opt.duration === 'function' | |
| ? opt.duration(distance) | |
| : opt.duration, | |
| timeStart, timeElapsed | |
| ; | |
| requestAnimationFrame(function(time) { timeStart = time; loop(time); }); | |
| function loop(time) { | |
| timeElapsed = time - timeStart; | |
| window.scrollTo(0, opt.easing(timeElapsed, start, distance, duration)); | |
| if (timeElapsed < duration) | |
| requestAnimationFrame(loop) | |
| else | |
| end(); | |
| } | |
| function end() { | |
| window.scrollTo(0, start + distance); | |
| if (typeof opt.callback === 'function') | |
| opt.callback(); | |
| } | |
| // Robert Penner's easeInOutQuad - http://robertpenner.com/easing/ | |
| function easeInOutQuad(t, b, c, d) { | |
| t /= d / 2 | |
| if(t < 1) return c / 2 * t * t + b | |
| t-- | |
| return -c / 2 * (t * (t - 2) - 1) + b | |
| } | |
| } | |
| window.smoothScroll = function (e, offset) { | |
| e.stopPropagation(); | |
| e.preventDefault(); | |
| offset = offset || -50; | |
| var vm = this; | |
| var hash = e.target.hash || e.currentTarget.hash | |
| jump(hash, { | |
| duration: 400, | |
| offset: offset, | |
| callback: function() {} | |
| }); | |
| } |
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