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Get PPI of the current device displaying your page

/ Published in: JavaScript
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Outputs the number of Pixels Per Inch in the current Device

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Copy this code and paste it in your HTML 
  1. getPPI : function(){
  2. 	var DOM_body = document.getElementsByTagName('body')[0];	
  3. 	var DOM_div = document.createElement('div');
  4. 	DOM_div.style = 'width: 1in; visibility:hidden;';
  5. 	DOM_body.appendChild(DOM_div);
  6. 	var w = document.defaultView.getComputedStyle(DOM_div, null).getPropertyValue('width');
  7. 	DOM_body.removeChild(DOM_div);
  8. 	return parseInt(w);
  9. }

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