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Javascript : Validate As You Type

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Javascript : Validate As You Type

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  1. //Javascript//
  2.  
  3. function validateAsYouType(inputElementId)
  4. {
  5. 	var val=inputElementId.value;
  6. 	var lastLetter=val.substring((val.length-1),val.length);
  7.  
  8. 	if(isNaN(lastLetter))
  9. 	{
  10. 		//Input is OK. Let things be as they are.
  11. 	}
  12.  
  13. 	else
  14. 	{
  15. 	   //Input is not OK. Rmove the last entered character
  16.  
  17. 	   var new_val=val.substr(0,val.length-1);
  18. 	   document.getElementById('inputtype').value=new_val;
  19.  
  20. 	}
  21.  
  22. }
  23.  
  24. //Javascript//
  25.  
  26.  
  27. Sample usage:
  28.  
  29. <input type="text" value="" id="inputtype" onkeyup="return validateAsYouType(this);" />

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