Passport Number validation

Can any one know how to validate a passport number and visa entered in the form? (.net/javascript/jquery)

Your Answer

var oldnumber=0;
var $ctrl=$('input[name=passport_number]');
$ctrl.focusout(function () { if (isFinite($ctrl.attr('value'))) { oldnumber=$ctrl.val(); }
else { $ctrl.attr('value',oldnumber);
} });
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if you type in a number, it remembers that number. If you write anything but a number, the field is set back to its previous value.

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