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fix issue toddmotto#83 (Image Inside a Scrollable div Would not be Lo…
…aded)
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ethonchan
authored and
ethonchan
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Apr 1, 2015
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Original file line number | Diff line number | Diff line change |
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@@ -1,134 +1,134 @@ | ||
(function (root, factory) { | ||
if (typeof define === 'function' && define.amd) { | ||
define(function() { | ||
return factory(root); | ||
}); | ||
} else if (typeof exports === 'object') { | ||
module.exports = factory; | ||
} else { | ||
root.echo = factory(root); | ||
} | ||
})(this, function (root) { | ||
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'use strict'; | ||
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var echo = {}; | ||
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var callback = function () {}; | ||
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var offset, poll, delay, useDebounce, unload; | ||
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var isHidden = function (element) { | ||
return (element.offsetParent === null); | ||
}; | ||
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var inView = function (element, view) { | ||
if (isHidden(element)) { | ||
return false; | ||
} | ||
(function() { | ||
'use strict'; | ||
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var box = element.getBoundingClientRect(); | ||
return (box.right >= view.l && box.bottom >= view.t && box.left <= view.r && box.top <= view.b); | ||
}; | ||
var echo = {}; | ||
var root = {}; | ||
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var debounceOrThrottle = function () { | ||
if(!useDebounce && !!poll) { | ||
return; | ||
} | ||
clearTimeout(poll); | ||
poll = setTimeout(function(){ | ||
echo.render(); | ||
poll = null; | ||
}, delay); | ||
}; | ||
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echo.init = function (opts) { | ||
opts = opts || {}; | ||
var offsetAll = opts.offset || 0; | ||
var offsetVertical = opts.offsetVertical || offsetAll; | ||
var offsetHorizontal = opts.offsetHorizontal || offsetAll; | ||
var optionToInt = function (opt, fallback) { | ||
return parseInt(opt || fallback, 10); | ||
}; | ||
offset = { | ||
t: optionToInt(opts.offsetTop, offsetVertical), | ||
b: optionToInt(opts.offsetBottom, offsetVertical), | ||
l: optionToInt(opts.offsetLeft, offsetHorizontal), | ||
r: optionToInt(opts.offsetRight, offsetHorizontal) | ||
var callback = function () { | ||
}; | ||
delay = optionToInt(opts.throttle, 250); | ||
useDebounce = opts.debounce !== false; | ||
unload = !!opts.unload; | ||
callback = opts.callback || callback; | ||
echo.render(); | ||
if (document.addEventListener) { | ||
root.addEventListener('scroll', debounceOrThrottle, false); | ||
root.addEventListener('load', debounceOrThrottle, false); | ||
} else { | ||
root.attachEvent('onscroll', debounceOrThrottle); | ||
root.attachEvent('onload', debounceOrThrottle); | ||
} | ||
}; | ||
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echo.render = function () { | ||
var nodes = document.querySelectorAll('img[data-echo], [data-echo-background]'); | ||
var length = nodes.length; | ||
var src, elem; | ||
var view = { | ||
l: 0 - offset.l, | ||
t: 0 - offset.t, | ||
b: (root.innerHeight || document.documentElement.clientHeight) + offset.b, | ||
r: (root.innerWidth || document.documentElement.clientWidth) + offset.r | ||
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var offset, poll, delay, useDebounce, unload; | ||
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var isHidden = function (element) { | ||
return (element.offsetParent === null); | ||
}; | ||
for (var i = 0; i < length; i++) { | ||
elem = nodes[i]; | ||
if (inView(elem, view)) { | ||
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if (unload) { | ||
elem.setAttribute('data-echo-placeholder', elem.src); | ||
var inView = function (element, view) { | ||
if (isHidden(element)) { | ||
return false; | ||
} | ||
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if (elem.getAttribute('data-echo-background') !== null) { | ||
elem.style.backgroundImage = "url(" + elem.getAttribute('data-echo-background') + ")"; | ||
} | ||
else { | ||
elem.src = elem.getAttribute('data-echo'); | ||
} | ||
var box = element.getBoundingClientRect(); | ||
return (box.right >= view.l && box.bottom >= view.t && box.left <= view.r && box.top <= view.b); | ||
}; | ||
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if (!unload) { | ||
elem.removeAttribute('data-echo'); | ||
elem.removeAttribute('data-echo-background'); | ||
var debounceOrThrottle = function () { | ||
if (!useDebounce && !!poll) { | ||
return; | ||
} | ||
clearTimeout(poll); | ||
poll = setTimeout(function () { | ||
echo.render(); | ||
poll = null; | ||
}, delay); | ||
}; | ||
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callback(elem, 'load'); | ||
} | ||
else if (unload && !!(src = elem.getAttribute('data-echo-placeholder'))) { | ||
echo.init = function (opts) { | ||
opts = opts || {}; | ||
root = opts.viewport || this || (0,eval)('this') | ||
var offsetAll = opts.offset || 0; | ||
var offsetVertical = opts.offsetVertical || offsetAll; | ||
var offsetHorizontal = opts.offsetHorizontal || offsetAll; | ||
var optionToInt = function (opt, fallback) { | ||
return parseInt(opt || fallback, 10); | ||
}; | ||
offset = { | ||
t: optionToInt(opts.offsetTop, offsetVertical), | ||
b: optionToInt(opts.offsetBottom, offsetVertical), | ||
l: optionToInt(opts.offsetLeft, offsetHorizontal), | ||
r: optionToInt(opts.offsetRight, offsetHorizontal) | ||
}; | ||
delay = optionToInt(opts.throttle, 250); | ||
useDebounce = opts.debounce !== false; | ||
unload = !!opts.unload; | ||
callback = opts.callback || callback; | ||
echo.render(); | ||
if (document.addEventListener) { | ||
root.addEventListener('scroll', debounceOrThrottle, false); | ||
root.addEventListener('load', debounceOrThrottle, false); | ||
} else { | ||
root.attachEvent('onscroll', debounceOrThrottle); | ||
root.attachEvent('onload', debounceOrThrottle); | ||
} | ||
}; | ||
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if (elem.getAttribute('data-echo-background') !== null) { | ||
elem.style.backgroundImage = "url(" + src + ")"; | ||
echo.render = function () { | ||
var nodes = document.querySelectorAll('img[data-echo], [data-echo-background]'); | ||
var length = nodes.length; | ||
var src, elem; | ||
var view = { | ||
l: 0 - offset.l, | ||
t: 0 - offset.t, | ||
b: (root.innerHeight || root.clientHeight) + offset.b, | ||
r: (root.innerWidth || root.clientWidth) + offset.r | ||
}; | ||
for (var i = 0; i < length; i++) { | ||
elem = nodes[i]; | ||
if (inView(elem, view)) { | ||
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if (unload) { | ||
elem.setAttribute('data-echo-placeholder', elem.src); | ||
} | ||
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if (elem.getAttribute('data-echo-background') !== null) { | ||
elem.style.backgroundImage = "url(" + elem.getAttribute('data-echo-background') + ")"; | ||
} | ||
else { | ||
elem.src = elem.getAttribute('data-echo'); | ||
} | ||
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if (!unload) { | ||
elem.removeAttribute('data-echo'); | ||
elem.removeAttribute('data-echo-background'); | ||
} | ||
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callback(elem, 'load'); | ||
} | ||
else if (unload && !!(src = elem.getAttribute('data-echo-placeholder'))) { | ||
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if (elem.getAttribute('data-echo-background') !== null) { | ||
elem.style.backgroundImage = "url(" + src + ")"; | ||
} | ||
else { | ||
elem.src = src; | ||
} | ||
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elem.removeAttribute('data-echo-placeholder'); | ||
callback(elem, 'unload'); | ||
} | ||
} | ||
else { | ||
elem.src = src; | ||
if (!length) { | ||
echo.detach(); | ||
} | ||
}; | ||
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elem.removeAttribute('data-echo-placeholder'); | ||
callback(elem, 'unload'); | ||
} | ||
} | ||
if (!length) { | ||
echo.detach(); | ||
} | ||
}; | ||
echo.detach = function () { | ||
if (document.removeEventListener) { | ||
root.removeEventListener('scroll', debounceOrThrottle); | ||
} else { | ||
root.detachEvent('onscroll', debounceOrThrottle); | ||
} | ||
clearTimeout(poll); | ||
}; | ||
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echo.detach = function () { | ||
if (document.removeEventListener) { | ||
root.removeEventListener('scroll', debounceOrThrottle); | ||
if ((typeof module !== "undefined" && module !== null) && module.exports) { | ||
module.exports = echo; | ||
} else if (typeof define === 'function') { | ||
define(function() { | ||
return echo; | ||
}); | ||
} else { | ||
root.detachEvent('onscroll', debounceOrThrottle); | ||
root.echo = echo; | ||
} | ||
clearTimeout(poll); | ||
}; | ||
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return echo; | ||
}()); | ||
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}); |