PopupControlExtender DynamicServiceMethod
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When you display records using ASP.NET GridView control it displays all the columns on the page and often you want to display only few columns in GridView due to the available space on the page. You can easily achieve this functionality by adding your own columns declaratively in the GridView control. But if you want to display other columns in a popup window for each row in the GridView control you need to use AJAX Popup Control with the GridView. In this tutorial I will show you how you can display GridView row details using ASP.NET AJAX Popup control extender.
To start this tutorial, create a new website in Visual Studio 2008 and add ScriptManager control on the page. This control is required to use any AJAX functionality on ASP.NET page. <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> Next you need to add GridView control on the page that has AutoGenerateColumns property set to false to stop ASP.NET to generate columns automatically. You also need to attach OnRowCreated event handler with the grid which I will use later in this tutorial to attach some JavaScript events with a magnify icon to display popup window on mouse over. Following is the complete markup of the GridView control. <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" BorderColor="#336699" BorderStyle="Solid" BorderWidth="1px" CellPadding="3" Font-Names="Verdana" Font-Size="10pt" onrowcreated="GridView1_RowCreated">
<Columns> <asp:BoundField DataField="ProductID" HeaderText="Product ID" /> <asp:BoundField DataField="ProductName" HeaderText="Product Name" />
<asp:TemplateField ItemStyle-Width="40" ItemStyle-HorizontalAlign="Right"> <ItemTemplate>
<asp:Image ID="Image1" runat="server" ImageUrl="~/images/magnify.gif" />
<ajax:PopupControlExtender ID="PopupControlExtender1" runat="server" PopupControlID="Panel1" TargetControlID="Image1" DynamicContextKey='<%# Eval("ProductID") %>' DynamicControlID="Panel1" DynamicServiceMethod="GetDynamicContent" Position="Bottom"> </ajax:PopupControlExtender>
</ItemTemplate>
</asp:TemplateField> </Columns> <HeaderStyle BackColor="#336699" ForeColor="White" /> </asp:GridView> The most important thing in the above markup is the TemplateField column definition in which I have used an image control to display magnify icon and ASP.NET AJAX Popup Control Extender.
The PopupControlID property needs the id of the control you want to use as a popup window with AJAX Popup Control in this case I have used Panel control.
The TargetControlID property needs the id of the control that will display the popup window in this case I have used Image1 control that shows magnify icon in the GridView column.
The DynamicServiceMethod property needs the name of the web service method you want to call for every popup window to load additional details from the database.
The DynamicContextKey property needs the dynamic value you want to pass to the dynamic web service method. In this example I am passing ProductID to load more details of the product in the popup window dynamically.
In the end you need a Panel control on the page which will be used as a popup window by the PopupControlExtender control. <asp:Panel ID="Panel1" runat="server">< /asp:Panel> Now I am moving to the code behind file of the ASP.NET page that has Page Load event to bind data with the GridView control as shown below: protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { LoadData(); } }
private void LoadData() { string constr = "Server=TestServer;Database=SampleDatabase;uid=test;pwd=test;"; string query = "SELECT ProductID, ProductName FROM Products";
SqlDataAdapter da = new SqlDataAdapter(query, constr); DataTable table = new DataTable();
da.Fill(table);
GridView1.DataSource = table; GridView1.DataBind(); } Next you need the OnRowCreated event definition that will perform two operations during the creation of every data row of the GridView control. First it will find the Popup Extender Control using the FindControl method and will add a unique behavior id with each popup control. Secondly it will find Image control in every row and will attach showPopup() and hidePopup() script with the image onmouseover and onmouseout events. This is required to display popup window on mouse over and hide popup window on mouse out automatically. protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow) { PopupControlExtender pce = e.Row.FindControl("PopupControlExtender1") as PopupControlExtender; string behaviorID = "pce_" + e.Row.RowIndex; pce.BehaviorID = behaviorID;
Image img = (Image)e.Row.FindControl("Image1");
string OnMouseOverScript = string.Format("$find('{0}').showPopup();", behaviorID); string OnMouseOutScript = string.Format("$find('{0}').hidePopup();", behaviorID);
img.Attributes.Add("onmouseover", OnMouseOverScript); img.Attributes.Add("onmouseout", OnMouseOutScript); } } In the end, you need the definition of GetDynamicContent service method that will be called by every ASP.NET AJAX Popup Control Extender to load dynamic data from the database and to display additional details in the popup window. The first few lines in the method below are loading additional columns from the Products table in database. The StringBuilder object is created to build html string for the tabular output in the popup window. You can build any type of html for display such as bullets, paragraphs, links etc. [System.Web.Services.WebMethodAttribute(), System.Web.Script.Services.ScriptMethodAttribute()] public static string GetDynamicContent(string contextKey) { string constr = "Server=TestServer;Database=SampleDatabase;uid=test;pwd=test;"; string query = "SELECT UnitPrice, UnitsInStock, Description FROM Products WHERE ProductID = " + contextKey;
SqlDataAdapter da = new SqlDataAdapter(query, constr); DataTable table = new DataTable();
da.Fill(table);
StringBuilder b = new StringBuilder();
b.Append("<table style='background-color:#f3f3f3; border: #336699 3px solid; "); b.Append("width:350px; font-size:10pt; font-family:Verdana;' cellspacing='0' cellpadding='3'>"); b.Append("<tr><td colspan='3' style='background-color:#336699; color:white;'>"); b.Append("<b>Product Details</b>"); b.Append("</td></tr>"); b.Append("<tr><td style='width:80px;'><b>Unit Price</b></td>"); b.Append("<td style='width:80px;'><b>Stock</b></td>"); b.Append("<td><b>Description</b></td></tr>");
b.Append("<tr>"); b.Append("<td>$" + table.Rows[0]["UnitPrice"].ToString() + "</td>"); b.Append("<td>" + table.Rows[0]["UnitsInStock"].ToString() + "</td>"); b.Append("<td>" + table.Rows[0]["Description"].ToString() + "</td>"); b.Append("</tr>");
b.Append("</table>");
return b.ToString(); } If you have implemented everything in this tutorial properly you will see the output similar to the figure shown in the start of this tutorial. Please make sure that you have imported the following namespaces in the code file before you run this project. using System; using System.Collections.Generic; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data.SqlClient; using System.Data; using AjaxControlToolkit; using System.Text;Also make sure that you have registered the AjaxControlToolkit in your aspx file using the Register directive as shown below: <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajax" %> Feel free to experiment with this tutorial and customize the output and data according to your own requirements.
