Why ScriptManager.RegisterClientScriptBlock does not work when in content page?

Question

I want to set image.imageurl dinamically... But the code bellow just works when the page is not on a masterpage.

Here is the code:

protected void AsyncFileUpload1_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
{
    Byte[] bytes = AsyncFileUpload1.FileBytes;
    string base64String = Convert.ToBase64String(bytes, 0, bytes.Length);

    ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "img",
        "top.document.getElementById('Image1').src='data:image/jpg;base64," + base64String + "';",
        true);
}

do you have an UpdatePanel on the MasterPage?

happygilmore
– happygilmore

2013-02-28 10:04:37 +00:00
Commented Feb 28, 2013 at 10:04 — happygilmore
– happygilmore, Commented Feb 28, 2013 at 10:04

Tim Schmelter · Accepted Answer · 2013-02-28 10:03:02Z

1

In the MasterPage the Id is derived from the ContentPlaceHolder, e.g.:

ctl00$ContentPlaceHolder1$Image1

But why don't you simply use Image1.ClientId instead?

ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "img",
    "top.document.getElementById('" + Image1.ClientId + "').src='data:image/jpg;base64," + base64String + "';",
    true);

edited Feb 28, 2013 at 10:03

answered Feb 28, 2013 at 9:33

Tim Schmelter

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Comments

Korijn · Accepted Answer · 2013-02-28 12:08:57Z

0

Tim Schmelter is correct, you could also set the ClientIDMode on the control to Static. E.g.

<asp:Image runat="server" ID="Image1" ClientIDMode="Static" />

MSDN Docs: http://msdn.microsoft.com/en-us/library/system.web.ui.control.clientidmode.aspx

answered Feb 28, 2013 at 12:08

Korijn

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1 Comment

Korijn Over a year ago

No problem! would you mind upvoting my answer and possibly mark it as answered? :)

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