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Posted By

noah on 06/28/07


Tagged

basic wrapper library DOM utility helper safe easy tools glue sanitycheck


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Safely Get and Operate Upon An Element

 / Published in: JavaScript
 

Pass this an ID or an object reference, as well as any number of functions that take the referenced object as a parameter. This wrapper is intended to provide a sanity check against missing DOM elements.

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  1. function safeGet () {
  2.   var o;
  3.   var ioj = arguments[0];
  4.   if (typeof ioj == 'string') {
  5.     o = document.getElementById(ioj);
  6.   } else {
  7.     o = ioj;   
  8.   }
  9.   if (typeof ioj != 'object') return;
  10.   for (var i=1; i< arguments.length; i++) {
  11.     arguments[i](o);
  12.   }
  13.   return true;
  14. }
  15.  
  16. //use it like this
  17. safeGet (document.body, 
  18. 	 function (o) {
  19. 	   o.style.background='black';
  20. 	 },
  21. 	 function (o) {
  22. 	   o.style.color='white';
  23. 	 }
  24. );
  25. //misuse it like this, but it won't throw an error
  26. safeGet ('someIdThatDontExist', 
  27. 	 function (o) {
  28. 	   o.style.background='black';
  29. 	 },
  30. 	 function (o) {
  31. 	   o.style.color='white';
  32. 	 }
  33. );

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