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Widget utilities for W3C compliant Widget Runtimes

/ Published in: JavaScript
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Here are several functions I think are very helpfull while building mobile widgets (W3C), ready for your copy-paste pleasure =D

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  1. //Some utilities for use in a typical widget that runs on W3C compliant Widget Runtimes
  2. //I am using jQuery's support for cookies, so if you are not using it, please tweak the code at will to fit your needs
  3. WidgetUtilities.prototype = {
  4. 	//Get the value associated with a configuration key
  5. 	getKey : function(key){
  6. 		if (typeof(widget) != "undefined"){ // A Widget Engine!
  7. 			return widget.preferenceForKey(key);
  8. 		}else{ // It's a browser!
  9. 			return $.cookie(key);
  10. 		}
  11. 	},
  12. 	//Set the value associated with a configuration key
  13. 	setKey : function(key, value){
  14. 		if (typeof(widget) != "undefined"){
  15. 			return widget.setPreferenceForKey(value, key);
  16. 		}else{
  17. 			return($.cookie(key, value));
  18. 		}
  19. 	},
  20. 	//Get the Pixels Per Inch on the device running the widget
  21.     getWidth : function(){
  22. 		var DOM_body = document.getElementsByTagName('body')[0];
  23.  
  24. 		var DOM_div = document.createElement('div');
  25. 		try{
  26. 			DOM_div.style = 'width: 1in; visibility:hidden;';
  27. 		}
  28. 		catch(e){
  29.  
  30. 		}
  31.  
  32. 		DOM_body.appendChild(DOM_div);
  33. 		var w = document.defaultView.getComputedStyle(DOM_div, null).getPropertyValue('width');
  34. 		DOM_body.removeChild(DOM_div);
  35.  
  36. 		return parseInt(w);
  37. 	},
  38. 	//Run a specified function in a "safe" manner. If execution throws an exception, show all available information
  39. 	catchy : function(fn){
  40. 		return function(){
  41. 			try{
  42. 				fn.apply(fn, arguments);
  43. 			}catch(e){
  44. 				var err = [];
  45. 				for (var key in e){
  46. 					if (!key || typeof key=="function") continue;
  47. 					err.push(key + ": " + e[key]);
  48. 				}
  49. 				widget.showNotification(err.join("\n"));
  50. 			}
  51. 		};
  52. 	}
  53. }

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