examples/webapp/ajax/ajax-redirect.htm

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$redirectLink

<div id="result" class="infoMsg">
  #set ($flash = "")
  #set ($flash = $session.flash)
  #if ($flash != "")
    $flash
  #end
</div>

Clicking the link above will send an Ajax request to the server which returns
a url to redirect to. The url is returned from the server in a custom response
header called <tt>'REDIRECT_URL'</tt>.
<p/>
Since Ajax does not support redirects, JavaScript is used to simulate a redirect
by setting the value of <tt>window.location</tt> to the redirect url.

<script type="text/javascript" src="$context/assets/js/jquery-1.4.2.js"></script>

<script type="text/javascript">
    // This example uses jQuery for making Ajax requests:
    // http://api.jquery.com/jQuery.get/
    // http://api.jquery.com/jQuery.ajax/

    // Register a function that is invoked as soon as the DOM is loaded
    jQuery(document).ready(function() {
        var resultElm = jQuery("#result")

        // Hide the result div initially if it contains no content
        if (jQuery.trim(resultElm.text()).length == 0) {
          resultElm.css("display", "none");
        } else {
            resultElm.css("display", "block");
        }

        // Register a 'click' handler that makes an Ajax request
        jQuery("#redirectLinkId").click(function(event){
            // Make ajax request
            redirectLinkClicked();

            // Prevent the default browser behavior of navigating to the link
            return false;
        })
    })

    function redirectLinkClicked() {
        var link = jQuery('#redirectLinkId');
        var extraData = link.attr('id') + '=1';
        var url = link.attr('href');
        jQuery.get(url, extraData, function(data, textStatus, xhr) {
            // Retrieve the url to redirect from the Ajax response header
            var redirect_url = xhr.getResponseHeader('REDIRECT_URL');
            // Perform the redirect
            window.location = redirect_url;

        });
    }
</script>