How to fire an event only when text is entered in an input box but not removed?

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The following code snippet triggers an alert event when a number is entered (or removed from) into a 9 * 9 Sudoku grid.

   $('table tr td input').on({"input": function () {
            var cell = $(this).val();

            if (!$.isNumeric(cell)) {
                alert("Please enter only numbers from 1 to 9");
            }

   }});

But how to remove the alert message when text is removed. It has to be triggered only when number is entered. Thanks in advance.

asked 1 min ago

user3627139

20