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Create Tooltip dynamically by AJAX PageMethod

Use Pop up div by JavaScript or AJAX Control Toolkit’s Hover Menu control can create a Tooltip easily.

However, if we need to create the content of tooltip dynamically by the Server-Side code, we can use the ICallbackEventHandler to achieve the faing goal, just like the solution in following link:

http://lancezhang.wordpress.com/2008/12/04/create-tooltip-dynamically

When you move the mouse on the text, the related image and text which will be created on the code-behind show up in the tooltip after 1 second. during the loading process, a “loading” gif picture will display in the tooltip box.

If we are using ASP.NET AJAX, the same effect can be achieve by AJAX Page Method easily.

Ok, here we go:

Step 1:

we need to set the EnablePageMethods=”true” for our ScriptManager or ToolkitScriptManager:

<asp:ScriptManager ID=“ScriptManager1″ runat=“server” EnablePageMethods=“true”>
</asp:ScriptManager>

Step 2:

Let’s create the Server-side method for create tooltip message, please notice the using references and attribute:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Script.Services;
using System.Web.Services;
using System.Web.UI;
using System.Web.UI.WebControls;

[ScriptService]
public partial class tooltiptest2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    [WebMethod]
    public static string GetTooltip(string imagename)
    {
        System.Threading.Thread.Sleep(1000);
        return @”this is just a demo: <br><img src=’” + imagename + “‘/>”;
    }
}

 

Step 3:

Complete the JavaScript code to invoke the page method:

<script type=“text/javascript”>
    var positionX;
    var positionY;

    function onSuccess(value, ctx, methodName) {
        document.getElementById(‘tooltipDiv’).innerHTML = value;
    }

    function onFailed(ex, ctx, methodName) {
        alert(ex.get_exceptionType());
    }

    function HandleMouseOut() {
        document.getElementById(‘tooltipDiv’).style.display = ‘none’;
        document.getElementById(‘tooltipDiv’).innerHTML = “<img src=’loading.gif’/>”;
    }

    function HandleMouseOver(Label) {

        PageMethods.GetTooltip(Label.innerText, onSuccess, onFailed);

        positionX = event.clientX;
        positionY = event.clientY;
        document.getElementById(‘tooltipDiv’).style.left = positionX;
        document.getElementById(‘tooltipDiv’).style.top = positionY;
        document.getElementById(‘tooltipDiv’).style.display = ‘block’;
    }
  
</script>

OK, the full code is following:

<%@ Page Language=”C#” AutoEventWireup=”true” CodeFile=”tooltiptest2.aspx.cs” Inherits=”tooltiptest2″ %>

<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html xmlns=“http://www.w3.org/1999/xhtml”>
<head id=“Head1″ runat=“server”>

    <script type=“text/javascript”>
        var positionX;
        var positionY;

        function onSuccess(value, ctx, methodName) {
            document.getElementById(‘tooltipDiv’).innerHTML = value;
        }

        function onFailed(ex, ctx, methodName) {
            alert(ex.get_exceptionType());
        }

        function HandleMouseOut() {
            document.getElementById(‘tooltipDiv’).style.display = ‘none’;
            document.getElementById(‘tooltipDiv’).innerHTML = “<img src=’loading.gif’/>”;
        }

        function HandleMouseOver(Label) {

            PageMethods.GetTooltip(Label.innerText, onSuccess, onFailed);

            positionX = event.clientX;
            positionY = event.clientY;
            document.getElementById(‘tooltipDiv’).style.left = positionX;
            document.getElementById(‘tooltipDiv’).style.top = positionY;
            document.getElementById(‘tooltipDiv’).style.display = ‘block’;
        }
      
    </script>

    <style type=“text/css”>
        .style1
        {
            border: 1px solid #96C2F1;
            background-color: #EFF7FF;
            position: absolute;
            display: none;
            filter: alpha(opacity=80);
            opacity: 0.80;
        }
    </style>
    <title>Untitled Page</title>
</head>
<body style=“font-family: Calibri; font-size: 15px;”>
    <form id=“form1″ runat=“server”>
    <asp:ScriptManager ID=“ScriptManager1″ runat=“server” EnablePageMethods=“true”>
    </asp:ScriptManager>
    <div id=“tooltipDiv” class=“style1″>
        <img src=“loading.gif” />
    </div>
    <div>
        <asp:Label ID=“Label1″ runat=“server” Text=“http://forums.asp.net/Themes/FAN/style/i/logo.png”
            onmouseout=“HandleMouseOut()” onmouseover=“HandleMouseOver(this)”></asp:Label>
        <br />
        <br />
        <br />
        <br />
        <asp:Label ID=“Label2″ runat=“server” Text=“http://forums.asp.net/Themes/fan/images/roleicons/a874d69e-0ac8-4b80-acc7-512767e281f6.gif”
            onmouseout=“HandleMouseOut()” onmouseover=“HandleMouseOver(this)”></asp:Label>
    </div>
    </form>
</body>
</html>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Script.Services;
using System.Web.Services;
using System.Web.UI;
using System.Web.UI.WebControls;

[ScriptService]
public partial class tooltiptest2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    [WebMethod]
    public static string GetTooltip(string imagename)
    {
        System.Threading.Thread.Sleep(1000);
        return @”this is just a demo: <br><img src=’” + imagename + “‘/>”;
    }
}

January 12, 2009 - Posted by Lance Zhang | ASP.NET, ASP.NET AJAX, ASP.NET AJAX Advance Tips & Tricks, Code and Solution, JavaScript | , , | 4 Comments

4 Comments »

  2. Hi,
    Good example, but for some reason I am getting System.InvalidOperationException in FF only in IE it works like a charm. This is frustrating that in doesn’t work in FF :(

    Comment by IP | February 9, 2009 | Reply

  3. I had been facing this problem when I tried to return a DataTable. This error
    was keeping on occuring what ever.

    Here’s the solution.

    Uncomment these lines in web.config.

    Read More

    http://muruganad.com/ASP.NET/ajax_PageMethods_System_InvalidOperationException.html

    Thanks!
    Murugan Andezuthu Dharmaratnam

    Comment by Murugan Andezuthu Dharmaratnam | August 30, 2009 | Reply


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