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Version Q2 2011 released 07/12/2011
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ToolTip / Image Gallery

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  • Image Gallery


    This example demonstrates how to organize an image gallery by using the RadToolTipManager control. The full size image is loaded in a tooltip and it has to be shown centered on the screen. However, when  each tooltip's content is with different size, the tooltip initially shows centered but after that it resizes itself according to the content's size and does not stay at the center.

    You can avoid this side effect by cancelling the tooltip's show and then dynamically set its content before showing it again:

     var currentTooltip = null; function OnClientBeforeShow(sender, args)
    {

                     //Hide the currently visible tooltip

                      if (currentTooltip)
                     {
                           if (currentTooltip != sender) currentTooltip.hide();
                           return;
                      }

                    currentTooltip = sender; args.set_cancel(true);
    }

    function centerTooltip(img)
    {
                    if (currentTooltip)
                   {
                         currentTooltip.set_contentElement(img);
                
                          //use the method updateLocation because it does not call WebService's method which loads the content 
                          currentTooltip.updateLocation();
                          currentTooltip = null;
                     }
    }

    The full size image is taken by using a WebService which WebMethod returns an image which executes the centerToolTip function when loaded:

     [WebMethod]
    .......................................

    Image img = new Image();
    img.ImageUrl = String.Format("~/Tooltip/Img/Northwind/Flowers/{0}.jpg", imageID);
    img.Attributes["onload"] = "centerTooltip(this);this.onload = null;";

    ........................................ 

     

Source Code

C# VB.NET
Show code in new window Demo isolation steps
  • <%@ Page Language="vb" CodeFile="DefaultVB.aspx.vb" Inherits="Telerik.Web.Examples.ToolTip.ImageGallery.DefaultVB" %>

    <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
    <%@ Register TagPrefix="qsf" Namespace="Telerik.QuickStart" %>
    <%@ Register TagPrefix="qsf" TagName="Header" Src="~/Common/Header.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="HeadTag" Src="~/Common/HeadTag.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="Footer" Src="~/Common/Footer.ascx" %>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
        <qsf:HeadTag ID="Headtag1" runat="server" />
        <link rel="Stylesheet" href="StyleSheet.css" />
        <style type="text/css">
            .title
            {
                display: block;
                font-weight: bold;
                text-decoration: underline;
                margin-top: 4px;
            }
            .info
            {
                color: black;
            }
        </style>
    </head>
    <body class="BODY">
        <form id="Form1" method="post" runat="server">
        <qsf:Header ID="Header1" runat="server" NavigationLanguage="VB" />
        <telerik:RadScriptManager ID="RadScriptManager1" runat="server">
        </telerik:RadScriptManager>

        <script type="text/javascript">
            var currentTooltip = null;

            function OnClientBeforeShow(sender, args) {
                //Hide the currently visible tooltip
                if (currentTooltip) {
                    if (currentTooltip != sender) currentTooltip.hide();
                    return;
                }

                currentTooltip = sender;
                args.set_cancel(true);
            }

            function centerTooltip(img) {
                if (currentTooltip) {
                    currentTooltip.set_contentElement(img);

                    //use the method updateLocation because it does not call WebService's method which loads the content
                    currentTooltip.updateLocation();
                    currentTooltip = null;
                }
            }
        </script>

        <telerik:RadToolTipManager ID="RadToolTipManager1" runat="server" Position="center"
            RelativeTo="BrowserWindow" OnClientBeforeShow="OnClientBeforeShow" EnableShadow="true">
            <WebServiceSettings Method="GetFullSizeImage" Path="ToolTipWebService.asmx" />
        </telerik:RadToolTipManager>
        <div class="wrapper">
            <asp:Repeater runat="server" ID="itemsRepeater" OnItemDataBound="ItemsRepeater_ItemDataBound">
                <ItemTemplate>
                    <div class="imageFrame">
                        <asp:Image runat="server" ID="Image" ImageUrl='<%# [String].Format("~/Tooltip/Img/Flowers/Thumbs/{0}.jpg", Container.DataItem) %>'
                            Style="border: solid 1px #e3d7c0;" AlternateText="Customer picture" />
                    </div>
                </ItemTemplate>
            </asp:Repeater>
        </div>
        <qsf:Footer runat="server" ID="Footer1" />
        </form>
    </body>
    </html>

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