https://sbi-medic.tokyo/js/autoagedate.min.js

1$(".js-birthday").each(function () {
2    var $year = $(".js-birthyear");
3    var $month = $(".js-birthmonth");
4    var $day = $(".js-birthday");
5    var $ageInput = $(".js-age");
6    
7    function toHalfWidth(str) {
8        return str.replace(/[\uFF10-\uFF19]/g, function (s) {
9            return String.fromCharCode(s.charCodeAt(0) - 0xFEE0);
10        });
11    }
12    var updateAge = function () {
13    	var yRaw = toHalfWidth($year.val());
14    	var y = parseInt(yRaw,10);
15        var m = parseInt(toHalfWidth($month.val()),10);
16        var d = parseInt(toHalfWidth($day.val()),10);
17        if (yRaw.length === 1 || yRaw.length === 2 || yRaw.length === 3) {
18			$ageInput.val("");
19			return;
20		}
21		if (Number.isNaN(y) || Number.isNaN(m) || Number.isNaN(d)) {
22            $ageInput.val("");
23            return;
24        }
25        var birthDate = new Date(y, m - 1, d);
26        var today = new Date();
27        var age = today.getFullYear() - birthDate.getFullYear();
28        var hasBirthdayPassed =
29            today.getMonth() > birthDate.getMonth() ||
30            (today.getMonth() === birthDate.getMonth() && today.getDate() >= birthDate.getDate());
31        if (!hasBirthdayPassed) {
32            age--;
33        }
34        if (Number.isNaN(y) || Number.isNaN(m) || Number.isNaN(d)) {
35			$ageInput.val("");
36			return;
37		}
38		$ageInput.val(age);
39    };
40    $year.on("change", updateAge);
41    $month.on("change", updateAge);
42    $day.on("change", updateAge);
43});
44//# sourceMappingURL=test_autoage.min.js.map