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！ --------------------编程问答-------------------- 查看生成出来的HTML源码生成出来到底是嘛东西 --------------------编程问答--------------------



 

 

<!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&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&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('q123k-qweid-123er-12345').style.display=''" />

</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>

--------------------编程问答-------------------- 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>");

--------------------编程问答-------------------- 因为我需要做成一个custom control.能指点一下吗？ --------------------编程问答-------------------- onfocus="document.getElementById('q123k-qweid-123er-12345').style.display=''" />

生成出来的ID让转换了
改成
--------------------编程问答-------------------- onfocus="document.getElementById('q123k-qweid-123er-12345').style.display=''" />
'在后台让转译了

补充：.NET技术 ,  ASP.NET