Hi,
Write an onChange client script. One sample is below
function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading || newValue === '') {
return;
}
var numnericVal=g_form.getValue('your field name');
if (isNaN(numnericVal)) // check if value is not numeric
{
alert("Please enter numeric values");
g_form.setValue('your field name', ''); // Set the field to empty
}
}
