48 lines
1.2 KiB
JavaScript
48 lines
1.2 KiB
JavaScript
(function() {
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// UTILITY FUNCTIONS
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window.addListener = (function() {
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return window.addEventListener
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? function(el, type, fn) { el.addEventListener(type, fn, false); }
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: function(el, type, fn) { el.attachEvent('on'+type, fn); };
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})();
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var getOffsetRect = function(elem)
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{
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var box = elem.getBoundingClientRect();
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var body = document.body;
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var docElem = document.documentElement;
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var scrollTop = window.pageYOffset || docElem.scrollTop || body.scrollTop;
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var scrollLeft = window.pageXOffset || docElem.scrollLeft || body.scrollLeft;
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var clientTop = docElem.clientTop || body.clientTop || 0;
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var clientLeft = docElem.clientLeft || body.clientLeft || 0;
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var top = box.top + scrollTop - clientTop;
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var left = box.left + scrollLeft - clientLeft;
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return { top: Math.round(top), left: Math.round(left) };
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};
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var getOffsetSum = function(elem)
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{
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var top = 0, left = 0;
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while(elem)
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{
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top = top + parseInt(elem.offsetTop);
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left = left + parseInt(elem.offsetLeft);
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elem = elem.offsetParent;
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}
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return { top: top, left: left };
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};
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window.getOffset = function(elem)
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{
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if (elem.getBoundingClientRect)
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return getOffsetRect(elem);
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else
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return getOffsetSum(elem);
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};
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})();
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