将代码后面的变量值传递给javascript

问题描述

| 我的.aspx页中有一个隐藏变量。

  input type=\"hidden\" runat=\"server\" id=\"isdup\" 

现在在后面的代码中，我检查某些条件并相应地为isdup分配一个值。但是，这可能对您没有太大帮助，但这是我在后面的代码中所做的事情。

            bool exist = (from n in mCDC.NCDCPoints
                          where n.EVENT_TYPE_ID == eventID
                          where n.BeginDate == begin
                          where n.EndDate == end
                          select n).Count() > 0;

    try
    {
        if (!exist)
        {
            //do this before insert so the insert will have correct values
            isdup.Value = \"false\";
            SaveAllColumnFields(ref ncdc,e);
            mCDC.NCDCPoints.InsertOnSubmit(ncdc);
            mCDC.SubmitChanges();
            //do this after insert because it wont work until the ncdc object
            //has been assigned an ID
            SaveAllDynamicFields(mCDC,ref ncdc,e);
            mCDC.SubmitChanges();
            Grid1.CurrentPageIndex = 0;
        }
        else
        {
            isdup.Value = \"true\";
            System.Windows.Forms.MessageBox.Show(isdup.Value);
        }

现在，我需要访问javascript中的isdup。但是，问题在于这些值没有被传递，并且isdup为null。

    var showus= document.getElementById(\"<%=isdup.ClientID %>\").value;
    alert(showus);
    if(showus == \"true\")
    {
      Showduplicate();
    }

所以，请让我知道我一直在做的错误？     

解决方法

        您是否尝试过：

  var showus= document.getElementById(\'<%=isdup.ClientID %>\').value;

更新 页面末尾是JavaScript吗？ 更新 尝试将此代码放在页面中：

 <asp:HiddenField ID=\"isdup\" runat=\"server\"  Value=\"eee\"/>
    <script>
        var showus = document.getElementById(\"<%=isdup.ClientID %>\").value;
        alert(showus);
</script>

这对我有用！ 更新 在page_load中...

   protected void Page_Load(object sender,EventArgs e)
    {

if (!ClientScript.IsStartupScriptRegistered(\"clientscript\"))
{
   string script1 = \"<script language=JavaScript>\";
   script1 += \"var showus= document.getElementById(\'\" + isdup.ClientID + \"\').value;\";
   script1 += \"alert(showus);\";
   script1 += \"</script>\";

   ClientScript.RegisterStartupScript(typeof(Page),\"clientscript\",script1);
}

我的例子：

 protected void pagesTree_NodeClick(object sender,RadTreeNodeEventArgs e)
   {
        PageStructure page = pageService.GetPage(Guid.Parse(e.Node.Value));

        this.LoadPageData(page);

        isdup.Value = \"xxx\";
    }

更新

         bool exist = (from n in mCDC.NCDCPoints
                      where n.EVENT_TYPE_ID == eventID
                      where n.BeginDate == begin
                      where n.EndDate == end
                      select n).Count() > 0;

 if (!ClientScript.IsStartupScriptRegistered(\"clientscript\"))
{
   string script1 = \"<script language=JavaScript>\";
   script1 += \"var showus= document.getElementById(\'\" + isdup.ClientID + \"\').value;\";
   script1 += \"alert(showus);\";
   script1 += \"</script>\";

   ClientScript.RegisterStartupScript(typeof(Page),script1);
}


try
{
    if (!exist)
    {
        //do this before insert so the insert will have correct values
        isdup.Value = \"false\";
        SaveAllColumnFields(ref ncdc,e);
        mCDC.NCDCPoints.InsertOnSubmit(ncdc);
        mCDC.SubmitChanges();
        //do this after insert because it wont work until the ncdc object
        //has been assigned an ID
        SaveAllDynamicFields(mCDC,ref ncdc,e);
        mCDC.SubmitChanges();
        Grid1.CurrentPageIndex = 0;
    }
    else
    {
        isdup.Value = \"true\";
        System.Windows.Forms.MessageBox.Show(isdup.Value);
    }

    ,        试试这个JQuery代码。

var showus= $(\"#<%=isdup.ClientID %>\").val();

替换您的“ 9”字段，并使用jquery代码尝试此操作 更新

<asp:HiddenField ID=\"isdup\" runat=\"server\" EnableViewState=\"true\" />
<script type=\"text/javascript\" src=\"http://code.jquery.com/jquery-1.6.1.min.js\"/>
<script type=\"text/javascript\" language=\"javascript\">
    $(document).ready(function() {
    var showus = $(\"#<%=isdup.ClientID %>\").val();
    alert(showus);
    if (showus == \"true\") {
        Showduplicate();
     }
    });
</script>