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| getOffset(obj) { | |
| var offsetLeft = 0; | |
| var offsetTop = 0; | |
| do { | |
| if (!isNaN(obj.offsetLeft)) { | |
| offsetLeft += obj.offsetLeft; | |
| } | |
| if (!isNaN(obj.offsetTop)) { | |
| offsetTop += obj.offsetTop; | |
| } | |
| } while(obj = obj.offsetParent ); | |
| return {left: offsetLeft, top: offsetTop}; | |
| } | |
| //source: https://mobiforge.com/design-development/html5-mobile-web-touch-events |
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