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

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隐瞒了意图╮
隐瞒了意图╮ 2020-12-14 07:09

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-as

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10条回答
  • 慢半拍i
    2020-12-14 07:29

    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
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  • 闹比i
    2020-12-14 07:29

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

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  • 有刺的猬
    2020-12-14 07:30

    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;
    }
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  • 孤独总比滥情好
    2020-12-14 07:33

    Try using

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

    instead.

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  • 旧时难觅i
    2020-12-14 07:36

    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";
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  • 后悔当初
    2020-12-14 07:39 
    <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.

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