document.when是什么东西

Question

<select name="month" onchange="On_Month()"></select>
<scrript>
function On_Month() {
            var Year = document.when.year.value;
            if (Year.length == 4) {
                Selected_Month = document.when.month.selectedIndex;
                Selected_Year = Year;
                Make_Calendar(Selected_Year, Selected_Month);
            }
}
</script>这个document.when.year.value在HTML里是能运行的，但是放到c#前台里就不认识了，就无法获取year的值
document.when是什么东西？为什么HTML里能运行？C#里就不行了呢？

Answer 1

恩，是有的，原来when是form的ID呀，但是为什么C#会报错？HTML不会？

Answer 2

要看ASP.Net最后生成的HTML代码的结构

Answer 3

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="Server">
    <table width="170" border="1" cellspacing="0" cellpadding="0">
        <form name="when">
        <tr>
            <td align="center">
                <div id="NavBar" style="position: relative; top: -1px;">
                    <select name="month" onchange="On_Month()">
                    </select>
                <input type="button" value=" 上月 " onclick="Skip('-')">
                <input type="button" value=" 下月 " onclick="Skip('+')">
            </td>
        </form>
        </tr>
    </table>
</asp:Content>我直接把HTML复制过来的，估计不对，但是我不知道C#里应该怎么写啊？新手请教一下。莫怪

Answer 4

上面写错了！<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="Server">
    <table width="170" border="1" cellspacing="0" cellpadding="0">
        <form name="when">
        <tr>
            <td align="center">
                <div id="NavBar" style="position: relative; top: -1px;">
                    <select name="month" onchange="On_Month()">
                    </select>
                 </div>
                <input type="button" value=" 上月 " onclick="Skip('-')">
                <input type="button" value=" 下月 " onclick="Skip('+')">
            </td>
        </tr>
       </form>
    </table>
</asp:Content>

Answer 5

把form标签写在table标签外面<form name="when">
<table width="170" border="1" cellspacing="0" cellpadding="0">
<tr>
            <td align="center">
                <div id="NavBar" style="position: relative; top: -1px;">
                    <select name="month" onchange="On_Month()">
                    </select>
                 </div>
                <input type="button" value=" 上月 " onclick="Skip('-')">
                <input type="button" value=" 下月 " onclick="Skip('+')">
            </td>
        </tr></table>
</form>这样~·

Answer 6

是网页运行后Html代码，找到when对应的ID ,可能是MainContent_when

Answer 7

改了。还是出错。。document.when.year.value的 year还是获取不到

Answer 8

貌似你表单里 就没有year的id或者name

Answer 9

晕，刚才省略掉了，这回全贴出来<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="Server">
        <form name="when">
        <table width="170" border="1" cellspacing="0" cellpadding="0">
            <tr>
                <td align="center">
                    <div id="NavBar" style="position: relative; top: -1px;">
                        <select name="month" onchange="On_Month()">
                        </select>
                      <input type="text" name="year" size="4" maxlength="4" onkeypress="returnCheck_Nums()" onkeyup="On_Year()"><br>
                        <div id="Clock" style="position: relative; top: -2px;">
                        </div>
                    </div>
                    <div id="Calendar" style="position: relative; top: -3px;">
                    </div>
                    <input type="button" value=" 上月 " onclick="Skip('-')">
                    <input type="button" value=" 下月 " onclick="Skip('+')">
                </td>
            </tr>
        </table>
        </form>
    <script>
        if (document.all) {
            for (j = 0; j < Month_Label.length; j++) {
                document.writeln('<option value=' + j + '>' + Month_Label[j]);
            }
        } 
    </script>
</asp:Content>一运行就说month或者year获取不到值，烦死我了！！！！！！！！！！！！

Answer 10

if (document.all) {你写这个document.all只有IE能进来~·别的浏览器 进不了if~·删了~·

Answer 11

 for (j = 0; j < Month_Label.length; j++) {
                document.writeln('<option value=' + j + '>' + Month_Label[j]);
            }直接写这个for循环

Answer 12

他不是在这出错的！！function Defaults() {
            var Mid_Screen = Math.round(document.body.clientWidth / 2);
            document.when.month.selectedIndex = Current_Month;
            document.when.year.value = Current_Year;
            Selected_Month = Current_Month;
            Selected_Year = Current_Year;
            Make_Calendar(Current_Year, Current_Month);
        }这个里面的document.when.month.selectedIndex = Current_Month;的时候出错的

Answer 13

但是你外面那个if(document.all)不能写~·写上这句就只有IE浏览器认了其他浏览器是进不了if的~·

Answer 14

我用的IE调试的啊~ 用的IE9

Answer 15

我用Jquery写是不简单点？换成 Jquery怎么写？