JavaScript: Firing alerts once per column

In our application there was a HTML table which is like an Excel Grid, where users can enter data.¬†Each cell contains a textbox through which user can enter data. There are alerts and remainders which can be configured and they get fired when the focus comes to the cell. However the business wants the alert to be fired only once per column. Assume that the table contains 10 rows and 10 columns. User has set alert for all even columns – 2,4 ,6 8 and 10. So when focus comes to this fied, system... more →
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