从JavaScript访问C＃变量？

Question

In my MS SQL table, I read in an "time_zone" for a city from a record. 在我的MS SQL表中，我从记录中读取城市的“ time_zone”。

I then want to use this time zone in a Javascript function to create a digital clock for that city. 然后，我想在Javascript函数中使用该时区为该城市创建一个数字时钟。

Currently I am trying to set the time_zone variable from 目前，我正在尝试从设置time_zone变量

Here's a code snippet from Default.aspx: 这是Default.aspx的代码片段：

            function showtime() {
                 zone(hiddenZone,clock);
            }
        window.onload = showtime;
</script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <span id="clock"></span>
    <asp:HiddenField ID="hiddenZone" runat="server" />
    <asp:Label Text="" ID="lblXml" runat="server"></asp:Label>
    </div>
    </form>
</body>
</html>

The only C# I have in my Default.aspx.cs for is: 我在Default.aspx.cs中拥有的唯一C＃是：

hiddenZone.Value=timeZone;

I've checked and timeZone has the correct value read in from the database. 我已经检查过并且timeZone具有从数据库中读取的正确值。

The error message I receive from the JS in the "showtime" function is: "hiddenZone is undefined" 我在“ showtime”函数中从JS收到的错误消息是：“ hiddenZone未定义”

How can I get the "timeZone" C# variable into my Javascript and use it for the function? 如何将“ timeZone” C＃变量放入Javascript并将其用于函数？

Answer 1

You have to check against the hiddenZone ClientID. 您必须对照hiddenZone ClientID进行检查。

function showtime() {
                 zone(
                      document.getElementById('<%=hiddenZone.ClientID%>'),
                      clock
                   );
            }

ASP.NET creates a new names for objects it creates on the HTML page, so they won't be the same as what you specify the id to be. ASP.NET会为其在HTML页面上创建的对象创建一个新名称，因此它们将与您指定的ID不同。

Answer 2

You can use your existing code by replacing: 您可以通过以下方式使用现有代码：

function showtime() {
    zone(hiddenZone, 'clock');
}

with 与

function showtime() {
    var elem = document.getElementById('<%= hiddenZone.ClientID %>');
    // if you are using ASP.NET AJAX use:
    // var elem = $get('<%= hiddenZone.ClientID %>');

    zone(elem.value, 'clock');
}

I'm not sure what your 'zone' function does either. 我不确定您的“区域”功能是做什么的。 But something like this may point you in the right direction if you are also having difficulties with it as well: 但是，如果您也遇到困难，那么类似的事情可能会为您指明正确的方向：

function zone(tz, dispID) {
    var elem = document.getElementById(dispID);
    // if you are using ASP.NET AJAX use:
    // var elem = $get(dispID);

    elem.innerHTML = tz;
}

Alternatively, if it were a public property on your page you can remove your reference to the asp:HiddenField and just use: 另外，如果它是页面上的公共属性，则可以删除对asp：HiddenField的引用，而只需使用：

function showtime() {
    zone(<%= MyFormsTimeZoneProperty %>, clock);
}

Answer 3

Put it in server side tags, 将其放在服务器端标签中，

        function showtime() {
             zone('<%= hiddenZone.Value %>',clock);
        }

从JavaScript访问C＃变量？

问题描述

3 个解决方案

解决方案1
4 已采纳 2009-07-15 17:06:41

解决方案2
2 2009-07-15 17:07:57

解决方案3
0 2009-07-15 17:06:22

从JavaScript访问C＃变量？

问题描述

3 个解决方案

解决方案1 4 已采纳 2009-07-15 17:06:41

解决方案2 2 2009-07-15 17:07:57

解决方案3 0 2009-07-15 17:06:22

解决方案1
4 已采纳 2009-07-15 17:06:41

解决方案2
2 2009-07-15 17:07:57

解决方案3
0 2009-07-15 17:06:22