display alert when making change during edit

[SOHIB]

HI All
I am doing some change in grade edit , i have tow columns : last_read,current_read
suppose i have enter current read by mistake is less than last_read
how i can display immediate alert or failure message showing that mistake

Thanks in advance

[arbei]

You may write Client Side Events.

[SOHIB]

Hello
this is working perfectly

{
    "change keyup": function(e) {
        // Your code
        var $row=$(this).fields();
        var cr=$row["curr_r"].toNumber();
        var lr=$row["last_r"].toNumber();
        var sf=$row["sewage_fees"].toNumber();
        var dif=cr-lr;
        $row["diff"].value(dif);
        var unc=$row["unit_cost"].toNumber();
        var camnt=dif*unc;
        var camnt1=(dif*unc)+sf;
        $row["curr_amnt"].value(camnt);
        var lamnt=$row["last_amnt"].toNumber();
        var tot=camnt1+lamnt;
        $row["total_amnt"].value(tot);
            
        if (e.keyCode == 13) {
            if (dif< 0) {
                //var cr=$row["curr_r"].toNumber();
                //var lr=$row["last_r"].toNumber();
                alert(" القراءه الحاليه اقل من القراءه السابقه!");
            }
        }
    }
}