JavaScript has a built-in function called isNAN that can be used to check if a value is numeric or not.
The isNan function returns true if the value is not numeric, and false if it is numeric:
function chkDigits(obj){ if (isNaN(document.getElementById(obj).value)==true) { alert("Please enter digits"); document.getElementById(obj).focus(); document.getElementById(obj).select(); return false; }}Here’s how to call it:
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