JS Select 月日日期联动

时间：2021-04-17 04:21:26

Js对Select控件进行联动操作，一个select选择月份后另一个select生成对应月份的所有日期。

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

    <title></title>

    <script type="text/javascript">

        window.onload = initForm;

        function initForm() {

            document.getElementById("months").selectedIndex = ;

            document.getElementById("months").onchange = populateDays;

        }

        function populateDays() {

            var monthDays = new Array(, , , , , , , , , , , );

            var monthStr = this.options[this.selectedIndex].value;

            if (monthStr != "") {

                var theMonth = parseInt(monthStr);

                document.getElementById("days").options.length = ;

                for (var i = ; i < monthDays[theMonth]; i++) {

                    document.getElementById("days").options[i] = new Option(i + );

                }

            }

        }

    </script>

</head>

<body>

    <form id="form1" runat="server">

        <div>

            <select runat="server" id="months">

                <option value="">Month</option>

                <option value="">January</option>

                <option value="">February</option>

                <option value="">March</option>

                <option value="">April</option>

                <option value="">May</option>

                <option value="">June</option>

                <option value="">July</option>

                <option value="">August</option>

                <option value="">September</option>

                <option value="">October</option>

                <option value="">November</option>

                <option value="">December</option>

            </select>

            <select runat="server" id="days">

                <option>Day</option>

            </select>

        </div>

    </form>

</body>

</html>

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