No more nonsense, I will just post the js code for you. The specific code is as follows:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<script src="js/jquery-1.7.2.min.js"></script>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="dr_year" runat="server"></asp:DropDownList>年
<asp:DropDownList ID="dr_month" runat="server"></asp:DropDownList>月
<asp:DropDownList ID="dr_day" runat="server"></asp:DropDownList>日
</div>
</form>
</body>
</html>
<script>
var days = 0;
years();
months();
Days();
var date = new Date();
$("#dr_year").val(date.getFullYear());
$("#dr_month").val((date.getMonth() + 1));
$("#dr_day").val(date.getDate());
$("#dr_year").change(function () {
months();
Days();
});
$("#dr_month").change(function () {
Days();
});
function years()
{
for(var i=1900;i<=2100;i++)
{
var str = "<option value=\"" + i + "\">" + i+ "</option>";
$("#dr_year").append(str);
}
}
function months() {
$("#dr_month").empty();
for (var i = 1; i <= 12; i++) {
var str = "<option value=\"" + i + "\">" + i + "</option>";
$("#dr_month").append(str);
}
}
function Days() {
$("#dr_day").empty();
if (parseInt($("#dr_month").val()) == 1 || parseInt($("#dr_month").val()) == 3 || parseInt($("#dr_month").val()) == 5 || parseInt($("#dr_month").val()) == 7 || parseInt($("#dr_month").val()) == 8 || parseInt($("#dr_month").val()) == 10 || parseInt($("#dr_month").val()) == 12) {
days = 31;
}
else if (parseInt($("#dr_month").val()) == 4 || parseInt($("#dr_month").val()) == 6 || parseInt($("#dr_month").val()) == 9 || parseInt($("#dr_month").val()) == 11) {
days = 30;
}
else {
if (parseInt($("#dr_year").val()) % 400 == 0 || (parseInt($("#dr_year").val()) % 4 == 0 && parseInt($("#dr_year").val()) % 100 != 0)) {
days = 29;
}
else {
days = 28;
}
}
for (var i = 1; i <= days; i++) {
var str = "<option value=\"" + i + "\">" + i + "</option>";
$("#dr_day").append(str);
}
}
</script>The above is the jQuery time and date three-level linkage effect that the editor shared with you. I hope it will be helpful to everyone
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