PostSparrow

Javascript Code

<script>
 $("#gstin_no").keypress(function(e){
			var charCode = e.which;
			var name = $("#gstin_no").val();

			/*
              8 - (backspace)
              32 - (space)
              48-57 - (0-9)Numbers
            */

			//alert(name);
			if (name.length <= 1)
			{
				if((charCode != 8 || charCode ==32 ) && (charCode < 48 || charCode > 57)) {
					return false;
				}
			}
			if (name.length > 1 && name.length < 7)
			{
				if(!(charCode >= 65 && charCode <= 90) && !(charCode >= 97 && charCode <= 122) && (charCode != 32 && charCode != 8) && !(charCode == 9)) {
					return false;
				}
			}
			if (name.length > 6 && name.length < 11)
			{
				if((charCode != 8 || charCode ==32 ) && (charCode < 48 || charCode > 57)) {
					return false;
				}
			}
			if (name.length == 11)
			{
				if(!(charCode >= 65 && charCode <= 90) && !(charCode >= 97 && charCode <= 122) && (charCode != 32 && charCode != 8) && !(charCode == 9)) {
					return false;
				}
			}
			if (name.length == 12)
			{
				if((charCode != 8 || charCode ==32 ) && (charCode < 48 || charCode > 57)) {
					return false;
				}
			}
			if (name.length == 13)
			{
				if(!(charCode >= 65 && charCode <= 90) && !(charCode >= 97 && charCode <= 122) && (charCode != 32 && charCode != 8) && !(charCode == 9)) {
					return false;
				}
			}
			if(name.length > 14){
				return false;
			}
		});
</script>