Accessing image button created in code behind file on aspx

Forcasual Things

11y4.2k.NET

created a image button in code behind file. It has an event imageButton_Click. also want to use this image button and event to create an async post back trigger for a update panel in code behind file. Is it possible to do that? right now it says it couldn't find control image button.

ImageButton imageButton = new ImageButton();

2 Replies

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Forcasual Things11y ago
Your idea of place holder is great and new to me. Although it still cannot find the button.the error says...A control with ID 'imageButton' could not be found for the trigger in UpdatePanel 'UpdatePanel1'. here is my actual code implemented with your help.
in aspx.cs

protected void LoadImages()
{
foreach (string strfile in Directory.GetFiles(Server.MapPath("~/images")))
{
ImageButton imageButton = new ImageButton();
FileInfo fi = new FileInfo(strfile);
imageButton.ImageUrl = "~/images/" + fi.Name;
imageButton.Height = Unit.Pixel(100);
imageButton.Style.Add("padding", "5px");
imageButton.Width = Unit.Pixel(100);
imageButton.Click += new ImageClickEventHandler(imageButton_Click); PlaceHolder1.Controls.Add(imageButton); ScriptManager.GetCurrent(this).RegisterPostBackControl(imageButton);
}
}
protected void imageButton_Click(object sender, ImageClickEventArgs fi) { testimage.ImageUrl = ((ImageButton)sender).ImageUrl; }
in aspx
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Manas Mohapatra11y ago
Hi,

As per requirement it is possible to add button and use async postback dynamically. Please find code below:

In aspx
In aspx page add update panel and placeholder control inside it. Because placeholder will help to add image button.


            PlaceHolder1" runat="server">


In aspx.cs
In code behind add methods for dynamically generate image button and method for partial postback.

// This method for generating image button and assign partial post back..
protected void AddControlButton_Click(object sender, EventArgs e)
{
      //Image Button
      ImageButton img = new ImageButton();
      img.ID = "imgBtn";
      img.AlternateText= "ImageButton";
      img.Click += new ImageClickEventHandler(imgBtn_Click);
      PlaceHolder1.Controls.Add(img);

      ScriptManager.GetCurrent(this).RegisterPostBackControl(img);
}

// This function is for image button partial postback
protected void imgBtn_Click(object sender, EventArgs e)
{
   // Implement your own logic
}
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