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Si un carácter es alfanumérico o no

/ Published in: JavaScript
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  1. function alphanumeric(val){
  2. 	var regex=/^[0-9A-Za-z]+$/;
  3. 	if(regex.test(val)){
  4. 		return true;
  5. 	} 
  6. 	else {
  7. 		return false;
  8. 	}
  9. }
  10.  
  11. function blah(e){
  12. var keynum = null;
  13. if(window.event) // IE
  14. {
  15. 	keynum = e.keyCode;
  16. }
  17. else if(e.which) // Netscape/Firefox/Opera
  18. {
  19. 	keynum = e.which;
  20. }
  21.  
  22. if ( (keynum!=null)&& (alphanumeric(keynum) )
  23. {
  24.  // Se ha pulsado un alfanumérico
  25. }

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