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Redirect cookie once per session

/ Published in: JavaScript
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Redirect a splash page using javascript. This snippet allows one redirect per session making the backwards navigation possible using the back button.

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Copy this code and paste it in your HTML 
  1. <script type="text/javascript">
  2. 	// taken from http://evolt.org/article/list/20/416/
  3. 		// <![CDATA[
  4. 	var Splash = GetCookie('SplashSkip');
  5. 	var ReDirected = GetCookie('SplashReDirected');
  6.  
  7. 	ReDirect('/welcome');
  8.  
  9. 	function ReDirect (URL) {
  10.  
  11. 		SetCookie('SplashSkip','TRUE',1);
  12.  
  13. 		if (Splash == 'TRUE' && ReDirected != 'TRUE' ) {
  14. 			SetCookie('SplashReDirected','TRUE');
  15. 			window.location=(URL);
  16. 		}
  17. 	}
  18.  
  19. 	function getCookieVal (offset) {
  20. 	  var endstr = document.cookie.indexOf (";", offset);
  21. 	  if (endstr == -1)
  22. 	    endstr = document.cookie.length;
  23. 	  return unescape(document.cookie.substring(offset, endstr));
  24. 	}
  25.  
  26. 	function GetCookie (name) {
  27. 	  var arg = name + "=";
  28. 	  var alen = arg.length;
  29. 	  var clen = document.cookie.length;
  30. 	  var i = 0;
  31. 	  while (i < clen) {
  32. 	  var j = i + alen;
  33. 	  if (document.cookie.substring(i, j) == arg)
  34. 	    return getCookieVal (j);
  35. 	  i = document.cookie.indexOf(" ", i) + 1;
  36. 	  if (i == 0) break; 
  37. 	  }
  38. 	  return null;
  39. 	}
  40.  
  41. 	function SetCookie(name, value, expDays, path, domain, secure) {
  42. 		// Set cookie with name, value etc provided
  43. 		// in function call and date from above
  44. 		// Number of days the cookie should persist NB expDays='' or undef. => non-persistent
  45. 		if (expDays != null ) {
  46. 			var expires = new Date(); 
  47. 			expires.setTime(expires.getTime() + (expDays*24*60*60*1000));
  48. 		}	
  49. 		var curCookie = name + "=" + escape(value) +
  50. 			((expires) ? "; expires=" + expires.toGMTString() : "") +
  51. 			((path) ? "; path=" + path : "") +
  52. 			((domain) ? "; domain=" + domain : "") +
  53. 			((secure) ? "; secure" : "");
  54. 		document.cookie = curCookie;
  55. 	}
  56. 		// ]]>
  57. 	</script>

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