CODEWITHSUNDEEP
asp.netiframe
Ian Boyd
Ian Boyd

Reputation: 256631

How can I access an IFRAME from the codebehind file in ASP.NET?

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";

Upvotes: 30

Views: 106865

Answers (10)

Joe Ratzer
Joe Ratzer

Reputation: 18549

Try using

this.Master.FindControl("ContentId").FindControl("controlId")

instead.

Upvotes: 1

Rajib Chy
Rajib Chy

Reputation: 880

aspx page

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

Code behind

this.fblikes.Attributes["src"] = "/productdetails/fblike.ashx";

Very simple....

Upvotes: -1

Jorge
Jorge

Reputation: 1186

Where is your iframe embedded?

Having this code

<body>

<iframe id="iFrame1" runat="server"></iframe>

<form id="form1" runat="server">

<div>
      <iframe id="iFrame2" runat="server"></iframe>
</div>
</form>

I can access with iFrame1.Attributes["src"] just to iFrame1 and not to iFrame2.

Alternatively, you can access to any element in your form with:

FindControl("iFrame2") as System.Web.UI.HtmlControls.HtmlGenericControl

Upvotes: 1

andyc
andyc

Reputation: 1

None of your suggestions worked for me, here is my solution:

add src="<%=_frame1%>" //to the iframe id="frame1" html control
public string _frame1 = "http://www.google.com";

Upvotes: 0

Mark Ibanez
Mark Ibanez

Reputation: 677

This works for me.

ASPX : 

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

I can access the iframe directly via id.

Code Behind : 

ContentIframe.Attributes["src"] = "stackoverflow.com";

Upvotes: 14

Sedecimdies
Sedecimdies

Reputation: 1

<iframe id="yourIframe" clientIDMode="static" runat="server"></iframe>

You should them be able to find your iframe using the findcontrol method.

setting clientIDMode to Static prevents you object from being renamed while rendering.

Upvotes: 0

Nathan Pillai
Nathan Pillai

Reputation:

Try this.

ContentPlaceHolder cplHolder = (ContentPlaceHolder)this.CurrentMaster.FindControl("contentMain");

HtmlControl cpanel= (HtmlControl)cplHolder.FindControl("contentPanel1");

Upvotes: 0

AaronSieb
AaronSieb

Reputation: 8266

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().

Upvotes: 12

RyanFetz
RyanFetz

Reputation: 525

The FindControl method looks in the child controls of the "control" the method is executed on. Try looking through the control collection recursively.

    protected virtual Control FindControlRecursive(Control root, String id)
    {
        if (root.ID == id) { return root; }
        foreach (Control c in root.Controls)
        {
            Control t = FindControlRecursive(c, id);
            if (t != null)
            {
                return t;
            }
        }
        return null;
    }

Upvotes: 0

Ian Jacobs
Ian Jacobs

Reputation: 5501

Try instantiating contentPanel1 outside the Load event; keep it global to the class.

Upvotes: 0

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