从代码后面(c#)设置javascript变量的值

Setting value for javascript variable from code behind (C#)

本文关键字：javascript 设置 变量 代码      更新时间：2023-09-26

我理解客户端脚本和服务器端脚本之间的区别。我有一个javascript函数和变量在我的MasterPage:

<script language="JavaScript" type="text/javascript">
    var needToConfirm = false;
          window.onbeforeunload = confirmExit;
          function confirmExit()
          {
            if (needToConfirm)
            {
              needToConfirm = false;
              return "Currently in edit mode. If you leave the page now then you will lose unsaved changes."
            }
          }
</script>

考虑到我的ASP。. NET(客户端)我可以将我的needToConfirm变量的值更改为true onClientClick，但默认情况下它是false。下面是一个例子。

 <asp:Button ID="btnEdit" runat="server" Text="  Edit  " onclick="btnEdit_Click" OnClientClick="needToConfirm = true;" />

现在的问题是，当在c#(服务器端)上，我必须将needToConfirm在if-statement下设置为true，但不一定在Page_Load上设置:

private void SetDefault()
    if (Session[def.ID_CUST] != null)
    {
          //I want to change the variable value here
    }
}

谢谢。

我使用的是。net 2.0 Classic和WebForms

后面的代码:

ScriptManager.RegisterStartupScript(this, this.GetType(), "", "urFunction('urValHere');", true);

客户端:

function urFunction(urParam) {
        //do what u want here
        //use urParam
    }

您可以使用隐藏输入，然后从服务器端将此输入设置为true或false。

客户端:

<input type="hidden" id="hdnConfirm" runat="server" value="false"/>

然后在服务器端:

 if (Session[def.ID_CUST] != null)
    {
          //I want to change the variable value here
           hdnConfirm.Value = "true";
    }

然后在客户端:

var needToConfirm = $('#hdnConfirm').val();

如果我理解正确的话，您可以像在http://msdn.microsoft.com/en-us/library/z9h4dk8y.aspx的示例中那样注册客户端脚本。

ClientScriptManager cs = Page.ClientScript;
if (!cs.IsStartupScriptRegistered(this.GetType(), "EditMode")) {
    cs.RegisterStartupScript(this.GetType(), "EditMode", "needToConfirm = true;", true);
}

这将写一个脚本到在Javascript中设置needToConfirm值的页面

基于你的更新说它是。net 2.0，这是你如何设置一个javascript变量:

Page.RegisterStartupScript("SetVar", "var needToConfirm = true;");

http://msdn.microsoft.com/en-us/library/system.web.ui.page.registerstartupscript (v = vs.80) . aspx

仅供参考。下面是做类似事情的4.5种方法:

 // Define the name and type of the client scripts on the page.
 const String csname1 = "MyScriptName";
 Type cstype = this.GetType();
 // Get a ClientScriptManager reference from the Page class.
 ClientScriptManager cs = Page.ClientScript;
 // Check to see if the startup script is already registered.
 if (!cs.IsStartupScriptRegistered(cstype, csname1))
 {
      StringBuilder cstext1 = new StringBuilder();
      cstext1.Append("<script> var myVariable = true; </");
      cstext1.Append("script>");
      cs.RegisterStartupScript(cstype, csname1, cstext1.ToString());
  }

http://msdn.microsoft.com/en-us/library/system.web.ui.clientscriptmanager.registerstartupscript (v = vs.110) . aspx

也许这有帮助?

<script type="text/javascript">
    function test(confirm){
        var needToConfirm = confirm;
        window.onbeforeunload = confirmExit;
        function confirmExit() {
            if (needToConfirm) {
                needToConfirm = false;
                return "Currently in edit mode. If you leave the page now then you will lose unsaved changes."
            }
        }
    }
</script>

<asp:Button ID="btnEdit" runat="server" Text="Edit" onclick="btnEdit_Click" OnClientClick="javascript:test(true);" />
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