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Posted By

rportela on 10/09/09


Tagged

javascript CALCULATION PPI


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Get PPI of the current device displaying your page

 / Published in: JavaScript
 

Outputs the number of Pixels Per Inch in the current Device

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  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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Posted By: snh72 on November 9, 2010

My version of firefox (3.0.19) did not execute this code successfully. The only change I had to make was that I had to change line 4 to the following: DOM_div.style.width = "1in"; You can also make the element invisible the same way, but it is going to be removed anyway.

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