Using DOMs excessively |
function Swipe(container, options) {
"use strict";
var noop = function() {};
var offloadFn = function(fn) { setTimeout(fn || noop, 0) };
var browser = {
addEventListener: !!window.addEventListener,
touch: ('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch,
transitions: (function(temp) {
var props = ['transformProperty', 'WebkitTransform', 'MozTransform', 'OTransform', 'msTransform'];
for ( var i in props ) if (temp.style[ props[i] ] !== undefined) return true;
return false;
})(document.createElement('swipe'))
};
if (!container) return;
var element = container.children[0];
var slides, slidePos, width;
options = options || {};
var index = parseInt(options.startSlide, 10) || 0;
var speed = options.speed || 300;
options.continuous = options.continuous ? options.continuous : true;
function setup() {
slides = element.children;
slidePos = new Array(slides.length);
width = container.getBoundingClientRect().width || container.offsetWidth;
element.style.width = (slides.length * width) + 'px';
var pos = slides.length;
while(pos--) {
var slide = slides[pos];
slide.style.width = width + 'px';
slide.setAttribute('data-index', pos);
if (browser.transitions) {
slide.style.left = (pos * -width) + 'px';
move(pos, index > pos ? -width : (index < pos ? width : 0), 0);
}
}
if (!browser.transitions) element.style.left = (index * -width) + 'px';
container.style.visibility = 'visible';
}
function prev() {
if (index) slide(index-1);
else if (options.continuous) slide(slides.length-1);
}
function next() {
if (index < slides.length - 1) slide(index+1);
else if (options.continuous) slide(0);
}
function slide(to, slideSpeed) {
if (index == to) return;
if (browser.transitions) {
var diff = Math.abs(index-to) - 1;
var direction = Math.abs(index-to) / (index-to);
while (diff--) move((to > index ? to : index) - diff - 1, width * direction, 0);
move(index, width * direction, slideSpeed || speed);
move(to, 0, slideSpeed || speed);
} else {
animate(index * -width, to * -width, slideSpeed || speed);
}
index = to;
offloadFn(options.callback && options.callback(index, slides[index]));
}
function move(index, dist, speed) {
translate(index, dist, speed);
slidePos[index] = dist;
}
function translate(index, dist, speed) {
var slide = slides[index];
var style = slide && slide.style;
if (!style) return;
style.webkitTransitionDuration =
style.MozTransitionDuration =
style.msTransitionDuration =
style.OTransitionDuration =
style.transitionDuration = speed + 'ms';
style.webkitTransform = 'translate(' + dist + 'px,0)' + 'translateZ(0)';
style.msTransform =
style.MozTransform =
style.OTransform = 'translateX(' + dist + 'px)';
}
function animate(from, to, speed) {
if (!speed) {
element.style.left = to + 'px';
return;
}
var start = +new Date;
var timer = setInterval(function() {
var timeElap = +new Date - start;
if (timeElap > speed) {
element.style.left = to + 'px';
if (delay) begin();
options.transitionEnd && options.transitionEnd.call(event, index, slides[index]);
clearInterval(timer);
return;
}
element.style.left = (( (to - from) * (Math.floor((timeElap / speed) * 100) / 100) ) + from) + 'px';
}, 4);
}
var delay = options.auto || 0;
var interval;
function begin() {
interval = setTimeout(next, delay);
}
function stop() {
delay = 0;
clearTimeout(interval);
}
var start = {};
var delta = {};
var isScrolling;
var events = {
handleEvent: function(event) {
switch (event.type) {
case 'touchstart': this.start(event); break;
case 'touchmove': this.move(event); break;
case 'touchend': offloadFn(this.end(event)); break;
case 'webkitTransitionEnd':
case 'msTransitionEnd':
case 'oTransitionEnd':
case 'otransitionend':
case 'transitionend': offloadFn(this.transitionEnd(event)); break;
case 'resize': offloadFn(setup.call()); break;
}
if (options.stopPropagation) event.stopPropagation();
},
start: function(event) {
var touches = event.touches[0];
start = {
x: touches.pageX,
y: touches.pageY,
time: +new Date
};
isScrolling = undefined;
delta = {};
element.addEventListener('touchmove', this, false);
element.addEventListener('touchend', this, false);
},
move: function(event) {
if ( event.touches.length > 1 || event.scale && event.scale !== 1) return
if (options.disableScroll) event.preventDefault();
var touches = event.touches[0];
delta = {
x: touches.pageX - start.x,
y: touches.pageY - start.y
}
if ( typeof isScrolling == 'undefined') {
isScrolling = !!( isScrolling || Math.abs(delta.x) < Math.abs(delta.y) );
}
if (!isScrolling) {
event.preventDefault();
stop();
delta.x =
delta.x /
( (!index && delta.x > 0
|| index == slides.length - 1
&& delta.x < 0
) ?
( Math.abs(delta.x) / width + 1 )
: 1 );
translate(index-1, delta.x + slidePos[index-1], 0);
translate(index, delta.x + slidePos[index], 0);
translate(index+1, delta.x + slidePos[index+1], 0);
}
},
end: function(event) {
var duration = +new Date - start.time;
var isValidSlide =
Number(duration) < 250
&& Math.abs(delta.x) > 20
|| Math.abs(delta.x) > width/2;
var isPastBounds =
!index && delta.x > 0
|| index == slides.length - 1 && delta.x < 0;
var direction = delta.x < 0;
if (!isScrolling) {
if (isValidSlide && !isPastBounds) {
if (direction) {
move(index-1, -width, 0);
move(index, slidePos[index]-width, speed);
move(index+1, slidePos[index+1]-width, speed);
index += 1;
} else {
move(index+1, width, 0);
move(index, slidePos[index]+width, speed);
move(index-1, slidePos[index-1]+width, speed);
index += -1;
}
options.callback && options.callback(index, slides[index]);
} else {
move(index-1, -width, speed);
move(index, 0, speed);
move(index+1, width, speed);
}
}
element.removeEventListener('touchmove', events, false)
element.removeEventListener('touchend', events, false)
},
transitionEnd: function(event) {
if (parseInt(event.target.getAttribute('data-index'), 10) == index) {
if (delay) begin();
options.transitionEnd && options.transitionEnd.call(event, index, slides[index]);
}
}
}
setup();
if (delay) begin();
if (browser.addEventListener) {
if (browser.touch) element.addEventListener('touchstart', events, false);
if (browser.transitions) {
element.addEventListener('webkitTransitionEnd', events, false);
element.addEventListener('msTransitionEnd', events, false);
element.addEventListener('oTransitionEnd', events, false);
element.addEventListener('otransitionend', events, false);
element.addEventListener('transitionend', events, false);
}
window.addEventListener('resize', events, false);
} else {
window.onresize = function () { setup() };
}
return {
setup: function() {
setup();
},
slide: function(to, speed) {
slide(to, speed);
},
prev: function() {
stop();
prev();
},
next: function() {
stop();
next();
},
getPos: function() {
return index;
},
kill: function() {
stop();
element.style.width = 'auto';
element.style.left = 0;
var pos = slides.length;
while(pos--) {
var slide = slides[pos];
slide.style.width = '100%';
slide.style.left = 0;
if (browser.transitions) translate(pos, 0, 0);
}
if (browser.addEventListener) {
element.removeEventListener('touchstart', events, false);
element.removeEventListener('webkitTransitionEnd', events, false);
element.removeEventListener('msTransitionEnd', events, false);
element.removeEventListener('oTransitionEnd', events, false);
element.removeEventListener('otransitionend', events, false);
element.removeEventListener('transitionend', events, false);
window.removeEventListener('resize', events, false);
}
else {
window.onresize = null;
}
}
}
}
if ( window.jQuery || window.Zepto ) {
(function($) {
$.fn.Swipe = function(params) {
return this.each(function() {
$(this).data('Swipe', new Swipe($(this)[0], params));
});
}
})( window.jQuery || window.Zepto )
}
| ready |
Using DOMs wisely |
function Swipe(container, options) {
"use strict";
var noop = function() {};
var offloadFn = function(fn) { setTimeout(fn || noop, 0) };
var browser = {
addEventListener: !!window.addEventListener,
touch: ('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch,
transitions: (function(temp) {
var props = ['transformProperty', 'WebkitTransform', 'MozTransform', 'OTransform', 'msTransform'];
for ( var i in props ) if (temp.style[ props[i] ] !== undefined) return true;
return false;
})(document.createElement('swipe'))
};
if (!container) return;
var element = container.children[0];
var slides, slidePos, width;
options = options || {};
var index = parseInt(options.startSlide, 10) || 0;
var speed = options.speed || 300;
options.continuous = options.continuous ? options.continuous : true;
function setup() {
slides = element.children;
slidePos = new Array(slides.length);
width = container.getBoundingClientRect().width || container.offsetWidth;
element.style.width = (slides.length * width) + 'px';
var pos = slides.length;
while(pos--) {
var slide = slides[pos];
slide.style.width = width + 'px';
slide.setAttribute('data-index', pos);
if (browser.transitions) {
slide.style.left = (pos * -width) + 'px';
move(pos, index > pos ? -width : (index < pos ? width : 0), 0);
}
}
if (!browser.transitions) element.style.left = (index * -width) + 'px';
container.style.visibility = 'visible';
}
function prev() {
if (index) slide(index-1);
else if (options.continuous) slide(slides.length-1);
}
function next() {
if (index < slides.length - 1) slide(index+1);
else if (options.continuous) slide(0);
}
function slide(to, slideSpeed) {
if (index == to) return;
if (browser.transitions) {
var diff = Math.abs(index-to) - 1;
var direction = Math.abs(index-to) / (index-to);
while (diff--) move((to > index ? to : index) - diff - 1, width * direction, 0);
move(index, width * direction, slideSpeed || speed);
move(to, 0, slideSpeed || speed);
} else {
animate(index * -width, to * -width, slideSpeed || speed);
}
index = to;
offloadFn(options.callback && options.callback(index, slides[index]));
}
function move(index, dist, speed) {
translate(index, dist, speed);
slidePos[index] = dist;
}
function translate(index, dist, speed) {
var slide = slides[index];
var style = slide && slide.style;
if (!style) return;
style.webkitTransitionDuration =
style.MozTransitionDuration =
style.msTransitionDuration =
style.OTransitionDuration =
style.transitionDuration = speed + 'ms';
style.webkitTransform = 'translate(' + dist + 'px,0)' + 'translateZ(0)';
style.msTransform =
style.MozTransform =
style.OTransform = 'translateX(' + dist + 'px)';
}
function animate(from, to, speed) {
if (!speed) {
element.style.left = to + 'px';
return;
}
var start = +new Date;
var timer = setInterval(function() {
var timeElap = +new Date - start;
if (timeElap > speed) {
element.style.left = to + 'px';
if (delay) begin();
options.transitionEnd && options.transitionEnd.call(event, index, slides[index]);
clearInterval(timer);
return;
}
element.style.left = (( (to - from) * (Math.floor((timeElap / speed) * 100) / 100) ) + from) + 'px';
}, 4);
}
var delay = options.auto || 0;
var interval;
function begin() {
interval = setTimeout(next, delay);
}
function stop() {
delay = 0;
clearTimeout(interval);
}
var start = {};
var delta = {};
var isScrolling;
var events = {
handleEvent: function(event) {
switch (event.type) {
case 'touchstart': this.start(event); break;
case 'touchmove': this.move(event); break;
case 'touchend': offloadFn(this.end(event)); break;
case 'webkitTransitionEnd':
case 'msTransitionEnd':
case 'oTransitionEnd':
case 'otransitionend':
case 'transitionend': offloadFn(this.transitionEnd(event)); break;
case 'resize': offloadFn(setup.call()); break;
}
if (options.stopPropagation) event.stopPropagation();
},
start: function(event) {
var touches = event.touches[0];
start = {
x: touches.pageX,
y: touches.pageY,
time: +new Date
};
isScrolling = undefined;
delta = {};
element.addEventListener('touchmove', this, false);
element.addEventListener('touchend', this, false);
},
move: function(event) {
if ( event.touches.length > 1 || event.scale && event.scale !== 1) return
if (options.disableScroll) event.preventDefault();
var touches = event.touches[0];
delta = {
x: touches.pageX - start.x,
y: touches.pageY - start.y
}
if ( typeof isScrolling == 'undefined') {
isScrolling = !!( isScrolling || Math.abs(delta.x) < Math.abs(delta.y) );
}
if (!isScrolling) {
event.preventDefault();
stop();
delta.x =
delta.x /
( (!index && delta.x > 0
|| index == slides.length - 1
&& delta.x < 0
) ?
( Math.abs(delta.x) / width + 1 )
: 1 );
translate(index-1, delta.x + slidePos[index-1], 0);
translate(index, delta.x + slidePos[index], 0);
translate(index+1, delta.x + slidePos[index+1], 0);
}
},
end: function(event) {
var duration = +new Date - start.time;
var isValidSlide =
Number(duration) < 250
&& Math.abs(delta.x) > 20
|| Math.abs(delta.x) > width/2;
var isPastBounds =
!index && delta.x > 0
|| index == slides.length - 1 && delta.x < 0;
var direction = delta.x < 0;
if (!isScrolling) {
if (isValidSlide && !isPastBounds) {
if (direction) {
move(index-1, -width, 0);
move(index, slidePos[index]-width, speed);
move(index+1, slidePos[index+1]-width, speed);
index += 1;
} else {
move(index+1, width, 0);
move(index, slidePos[index]+width, speed);
move(index-1, slidePos[index-1]+width, speed);
index += -1;
}
options.callback && options.callback(index, slides[index]);
} else {
move(index-1, -width, speed);
move(index, 0, speed);
move(index+1, width, speed);
}
}
element.removeEventListener('touchmove', events, false)
element.removeEventListener('touchend', events, false)
},
transitionEnd: function(event) {
if (parseInt(event.target.getAttribute('data-index'), 10) == index) {
if (delay) begin();
options.transitionEnd && options.transitionEnd.call(event, index, slides[index]);
}
}
}
setup();
if (delay) begin();
if (browser.addEventListener) {
if (browser.touch) element.addEventListener('touchstart', events, false);
if (browser.transitions) {
element.addEventListener('webkitTransitionEnd', events, false);
element.addEventListener('msTransitionEnd', events, false);
element.addEventListener('oTransitionEnd', events, false);
element.addEventListener('otransitionend', events, false);
element.addEventListener('transitionend', events, false);
}
window.addEventListener('resize', events, false);
} else {
window.onresize = function () { setup() };
}
return {
setup: function() {
setup();
},
slide: function(to, speed) {
slide(to, speed);
},
prev: function() {
stop();
prev();
},
next: function() {
stop();
next();
},
getPos: function() {
return index;
},
kill: function() {
stop();
element.style.width = 'auto';
element.style.left = 0;
var pos = slides.length;
while(pos--) {
var slide = slides[pos];
slide.style.width = '100%';
slide.style.left = 0;
if (browser.transitions) translate(pos, 0, 0);
}
if (browser.addEventListener) {
element.removeEventListener('touchstart', events, false);
element.removeEventListener('webkitTransitionEnd', events, false);
element.removeEventListener('msTransitionEnd', events, false);
element.removeEventListener('oTransitionEnd', events, false);
element.removeEventListener('otransitionend', events, false);
element.removeEventListener('transitionend', events, false);
window.removeEventListener('resize', events, false);
}
else {
window.onresize = null;
}
}
}
}
if ( window.jQuery || window.Zepto ) {
(function($) {
$.fn.Swipe = function(params) {
return this.each(function() {
$(this).data('Swipe', new Swipe($(this)[0], params));
});
}
})( window.jQuery || window.Zepto )
}
| ready |