再开一贴。求助关于使用document.getElementById的使用

.net 4.0，介绍说可以绑定使Control.ClientID=Control.ID。
protected void Page_Load(object sender, EventArgs e)
        {
            var t = new TextBox();
            var i = new Image();
            i.ClientIDMode = ClientIDMode.Static;
            i.ID="q123k-qweid-123er-12345";
            i.Visible = false;
            Panel1.Controls.Add(t);
            Panel1.Controls.Add(i);
            t.Attributes.Add("onfocus", "document.getElementById('q123k-qweid-123er-12345').style.display=''");
        }
报错object不存在。求教！

解决方案 »

  1.   

    查看生成出来的HTML源码 生成出来到底是嘛东西
      

  2.   


     
     
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
    <head><title>
    Home Page
    </title><link href="Styles/Site.css" rel="stylesheet" type="text/css" />
    </head>
    <body>
        <form method="post" action="default.aspx" id="ctl01">
    <div class="aspNetHidden">
    <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJNjU1NDk0ODUzD2QWAmYPZBYCAgMPZBYCAgUPZBYCAgEPZBYCAgEPD2QWAh4Hb25mb2N1cwVDZG9jdW1lbnQuZ2V0RWxlbWVudEJ5SWQoJ3ExMjNrLXF3ZWlkLTEyM2VyLTEyMzQ1Jykuc3R5bGUuZGlzcGxheT0nJ2RkeMJ1rbAhnIJcvXFgodI5rmX/6CfFw3Zlp/Um4vlzZyQ=" />
    </div>
     
     
    <script src="/WebResource.axd?d=-uYyq2UItxQeWmcqa1mrseT_4x_4Dgu2dsqDOT7V4rV-BVxQtredj3ycfAlxKlBYDZzTbm4DoR_uDcZ9cCKObLGRd_SKyJOx_Jpiovj0X4E1&amp;t=634671481629598994" type="text/javascript"></script>
    <div class="aspNetHidden">
     
    <input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWAgLP/6WqDgLB7/uoC7J9tFSWDBXLBh5Mon1WPLdawhXPT31RHsb3qFAge7rq" />
    </div>
        <div class="page">
            <div class="header">
                <div class="title">
                    <h1>
                        My ASP.NET Application
                    </h1>
                </div>
                <div class="loginDisplay">
                    
                            [ <a href="Account/Login.aspx" id="HeadLoginView_HeadLoginStatus">Log In</a> ]
                        
                </div>
                <div class="clear hideSkiplink">
                    <a href="#NavigationMenu_SkipLink"><img alt="Skip Navigation Links" src="/WebResource.axd?d=n8YKnGYR_vMyj3p8qvrtVO7V0x0q2eN11OAj6WtpqJWVNxo_4L4a1WvAWx-HriSMV9B4bWu9rBYergtUx--oR8CNgQTTfo5JdX3tV6w6kDE1&amp;t=634671481629598994" width="0" height="0" style="border-width:0px;" /></a><div class="menu" id="NavigationMenu">
    <ul class="level1">
    <li><a class="level1" href="Default.aspx">Home</a></li><li><a class="level1" href="About.aspx">About</a></li>
    </ul>
    </div><a id="NavigationMenu_SkipLink"></a>
                </div>
            </div>
            <div class="main">
                
        <div id="MainContent_Panel1">

        <input name="ctl00$MainContent$ctl00" type="text" onfocus="document.getElementById(&#39;q123k-qweid-123er-12345&#39;).style.display=&#39;&#39;" />
    </div>
     
            </div>
            <div class="clear">
            </div>
        </div>
        <div class="footer">
            
        </div>
        
    <script type='text/javascript'>new Sys.WebForms.Menu({ element: 'NavigationMenu', disappearAfter: 500, orientation: 'horizontal', tabIndex: 0, disabled: false });</script></form>
    </body>
    </html>
      

  3.   

    你完全可以在前台加脚本事件，而没必要再CS里纠结另外你还可以使用如下方式this.RegisterClientScriptBlock("awoke","<script>alert('hello');</script>");
      

  4.   

    因为我需要做成一个custom control.能指点一下吗？
      

  5.   

    onfocus="document.getElementById(&#39;q123k-qweid-123er-12345&#39;).style.display=&#39;&#39;" />生成出来的ID让转换了
    改成
      

  6.   

    onfocus="document.getElementById(&#39;q123k-qweid-123er-12345&#39;).style.display=&#39;&#39;" />
    '在后台让转译了