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  1. var parts = document.location.href.split("/");
  2. var id = parts[parts.length-1];
  3.    
  4. var url = document.URL.split('/');
  5.    
  6. var id = url.pop();
  7.    
  8. var id = url[url.lengh-1];
  9.    
  10. function isNumeric(n) {
  11.     return !isNaN(parseFloat(n)) && isFinite(n);
  12. }
  13.  
  14. function GetIdIfExists() {
  15.     var parts = document.location.href.split("/");
  16.     var id = parts[parts.length - 1];
  17.  
  18.     if (isNumeric(id)) {
  19.         return parseInt(id);
  20.     } else {
  21.         return null;
  22.     }
  23. }
  24.    
  25. //url = https://stackoverflow.com/questions/15761950/how-do-get-optional-parameter-value-using-javascript-in-mvc
  26. > GetIdIfExists()
  27. < null
  28.  
  29. //url = https://stackoverflow.com/questions/15761950/how-do-get-optional-parameter-value-using-javascript-in-mvc/0
  30. > GetIdIfExists()
  31. < 0
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