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Format Number in ActionScript

/ Published in: ActionScript
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This code was adapted from a snippet I found somewhere awhile back... can't claim complete credit

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  1. function numberFormat(number, decimals, thousands_sep, decimal_sep) {
  2. 		//   var_number.number_format([decimals ,thousand separator,decimal separator]);
  3. 		//   var number: number to format
  4. 		//   decimals: how many decimal numbers (default value 0);
  5. 		//   thousand separator: char that define the thousandecimal_sep (default value ,);
  6. 		//   decimal separator: char the defines the decimals (default value .);
  7.  
  8. 		if(isNaN(number)) return undefined;
  9. 		if(decimals < 0) return undefined;   
  10. 		if(decimals == undefined) decimals = 0;
  11. 		if(thousands_sep == undefined) thousands_sep = ',';
  12. 		if(decimal_sep == undefined) decimal_sep = '.';
  13.  
  14. 		var returned = number.toString().split('.'), str_begin, str_after, temp_str = "", i;
  15.  
  16. 		if(returned.length == 1) {
  17. 			str_begin = returned[0]
  18. 			str_after = '';
  19. 		} else if(returned.length == 2) {
  20. 			str_begin = returned[0];
  21. 			str_after = returned[1];
  22. 			str_after = str_after.substr(0, 2);
  23. 		} else {
  24. 			trace("uncaught number format");
  25. 		}
  26.  
  27. 		// thousands seperator
  28. 		if(str_begin.length > 3) {
  29. 			for(i = 0; i < str_begin.length; i++) {
  30. 				if(((str_begin.length - i) % 3) == 0 && i != str_begin.length - 1) {
  31. 					temp_str = temp_str + thousands_sep + str_begin.charAt(i);
  32. 				} else {
  33. 					temp_str = temp_str + str_begin.charAt(i);
  34. 				}
  35. 			}
  36. 		} else {
  37. 			temp_str = str_begin;
  38. 		}
  39.  
  40. 		//   ----------------------
  41. 		//   decimals
  42. 		//   if decimals==0 return
  43. 		//   ----------------------
  44. 		if(decimals > 0) {
  45. 			str_after = str_after.substr(0, decimals);
  46.  
  47. 			if(str_after.length < decimals) {
  48. 				while(str_after.length < decimals) {
  49. 					str_after += '0';
  50. 				}
  51. 			}
  52. 		}
  53.  
  54. 		if(decimals > 0) {
  55. 			return temp_str + decimal_sep + str_after;
  56. 		} else {
  57. 			return temp_str;
  58. 		}
  59. 	}

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