Use the following function to Check the object does ahve a Numeric value or not.
javascript :
function Validatenumber(obj)
{
if (obj.length !=0)
{
var text = /^[-0-9]+$/;
if ((document.getElementById(obj.id).value != "") && (!text.test(document.getElementById(obj.id).value)))
{
alert("Please enter numeric values only");
obj.focus();
obj.select();
}
}
}
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