Rotate Hyperlink Controls Using Jquery
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This short article demonstrates how to rotate a group of Hyperlink Controls in the same position using jQuery.
Note that for demonstration purposes, I have included jQuery code in the same page. Ideally, these resources should be created in separate folders for maintainability.
People who have been monetizing their sites need no introduction to TextLinkAds. In simple words, Text Link Ads are Hyperlinks sponsored by Advertisers. When a user clicks on these hyperlinks, they are sent to the sponsor’s website. In this recipe, I will demonstrate how to rotate multiple hyperlinks or TextLinkAds on the same position.
Let us quickly jump to the solution and see how we can rotate a group of Hyperlink Controls using client-side code. This example uses the latest minified version of jQuery which is 1.3.2 that can be downloaded from here. This example assumes that you have a folder called "Scripts" with the jQuery file (jquery-1.3.2.min.js) in that folder

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Timer based toggling of hyperlink</title>
    <script type='text/javascript'
        src='../Scripts/jquery-1.3.2.min.js'>
    </script>
   
    <script type="text/javascript">
        $(function() {
            var anch = $("a.dev");
            $(anch).hide().eq(0).show();
            var cnt = anch.length;
 
            setInterval(linkRotate, 3000);
 
            function linkRotate() {
               $(anch).eq((anch.length++) % cnt).fadeOut("slow", function() {
                    $(anch).eq((anch.length) % cnt)
                    .fadeIn("slow");
                });
            }
        });
    </script>
 
</head>
<body>
    <form id="form1" runat="server">
    <div class="tableDiv">
        <h2>The Hyperlink and Text shown below changes after 3 seconds
        </h2><br />
        <asp:HyperLink ID="linkA" runat="server" class="dev"
            NavigateUrl="http://www.google.com">
            Google</asp:HyperLink>
        <asp:HyperLink ID="linkB" runat="server" class="dev"
            NavigateUrl="http://www.yahoo.com">
            Yahoo</asp:HyperLink>
        <asp:HyperLink ID="linkC" runat="server" class="dev"
            NavigateUrl="http://www.microsoft.com">
            Microsoft</asp:HyperLink>
    </div>
    </form>
</body>
</html>
We begin by hiding all the hyperlinks with class="dev" and then display the first one.

var anch = $("a.dev");
$(anch).hide().eq(0).show();
We then use the JavaScript setInterval() function to delay the execution of a function (linkRotate) for a specific time, in our case 3000 millisecond (3 seconds), as shown below:
setInterval(linkRotate, 3000);
The advantage of the setInterval() function is that it continues to repeat the process of triggering the function at the specified interval, thereby giving it a loop effect.
In the linkRotate() function, we use a simple expression (anch.length++) % cnt that calculates the index to be supplied to the eq() selector and applies the fadeout/fadeIn() animations on the current hyperlink. eq(0) refers to the first link, eq(1) to the second link and so on.
function linkRotate() {
    $(anch).eq((anch.length++) % cnt).fadeOut("slow", function() {
        $(anch).eq((anch.length) % cnt)
        .fadeIn("slow");
    });
}

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