如何从ASP.NET中的codebehind文件访问IFRAME？ [英] How can I access an IFRAME from the codebehind file in ASP.NET?

问题描述

我试图从code隐藏aspx.cs文件中的IFRAME HTML控件设置属性。

我碰上了一个帖子，说你可以使用的FindControl找到非使用-Asp控制：

ASPX文件包括：

 ＆LT; IFRAME ID =contentPanel1=服务器/＆GT;
 

然后code-隐藏文件包括：

 保护无效的Page_Load（对象发件人，EventArgs的发送）
{
    HTMLControl时contentPanel1 =（HTMLControl时）this.FindControl（contentPanel1）;
    如果（contentPanel1！= NULL）
    contentPanel1.Attributes [SRC] =htt​​p://www.stackoverflow.com;}
 

除了它没有找到控制，contentPanel1为null。

---

更新1

看着呈现的HTML：

 ＆LT; IFRAME ID =ctl00_ContentPlaceHolder1_contentPanel1＆GT;＆LT; / IFRAME＆GT;
 

我试图改变code-背后：

  HTMLControl时contentPanel1 =（HTMLControl时）this.FindControl（ctl00_ContentPlaceHolder1_contentPanel1）;如果（contentPanel1！= NULL）
    contentPanel1.Attributes [SRC] =htt​​p://www.clis.com;
 

但它并没有帮助。

我使用的是母版。

---

更新2

ASPX文件更改为：

 ＆LT; IFRAME ID =contentPanel1NAME =contentPanel1=服务器/＆GT;
 

也没有帮助

---

答

答案是显而易见的，不配甚至要求原来的问题。如果您有ASPX code：

 ＆LT; IFRAME ID =contentPanel1=服务器/＆GT;
 

和希望从code-隐藏文件访问iframe中，你只需访问：

  this.contentPanel1.Attributes [SRC] =htt​​p://www.stackoverflow.com;
 

解决方案

如果iframe的直接其中code上的页面上，你应该能够直接引用它：

 
contentPanel1.Attribute =价值;
 

如果不是（这是在孩子的控制，或母版），你需要的页面层次结构的一个好主意......或者使用编写的FindControl的递归版本（的穷举法）。

I am trying to set attributes for an IFRAME html control from the code-behind aspx.cs file.

I came across a post that says you can use FindControl to find the non-asp controls using:

The aspx file contains:

<iframe id="contentPanel1" runat="server" />

and then the code-behind file contains:

protected void Page_Load(object sender, EventArgs e)
{
    HtmlControl contentPanel1 = (HtmlControl)this.FindControl("contentPanel1");
    if (contentPanel1 != null)
    	contentPanel1.Attributes["src"] = "http://www.stackoverflow.com";

}

Except that it's not finding the control, contentPanel1 is null.

---

Update 1

Looking at the rendered html:

<iframe id="ctl00_ContentPlaceHolder1_contentPanel1"></iframe>

i tried changing the code-behind to:

HtmlControl contentPanel1 = (HtmlControl)this.FindControl("ctl00_ContentPlaceHolder1_contentPanel1");

if (contentPanel1 != null)
    contentPanel1.Attributes["src"] = "http://www.clis.com";

But it didn't help.

i am using a MasterPage.

---

Update 2

Changing the aspx file to:

<iframe id="contentPanel1" name="contentPanel1" runat="server" />

also didn't help

---

Answer

The answer is obvious, and unworthy of even asking the original question. If you have the aspx code:

<iframe id="contentPanel1" runat="server" />

and want to access the iframe from the code-behind file, you just access it:

this.contentPanel1.Attributes["src"] = "http://www.stackoverflow.com";

解决方案

If the iframe is directly on the page where the code is running, you should be able to reference it directly:

contentPanel1.Attribute = value;

If not (it's in a child control, or the MasterPage), you'll need a good idea of the hierarchy of the page... Or use the brute-force method of writing a recursive version of FindControl().

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