sharepoint_comments_soap.js

function getCommentCount(url, itemId) {
        var soapEnv =
        "<soap:Envelope xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'>" +
              "<soap:Body>" +
                    "<CountCommentsOnUrl xmlns='http://microsoft.com/webservices/SharePointPortalServer/SocialDataService'>" +
                                "<url>" + url + "</url>" +
                     "</CountCommentsOnUrl>" +
              "</soap:Body>" +
         "</soap:Envelope>";

        $.ajax({
            pageurl: url,
            url: "/_vti_bin/SocialDataService.asmx?op=CountCommentsOnUrl",
            type: "POST",
            dataType: "xml",
            data: soapEnv,
            contentType: "text/xml; charset=\"utf-8\"",
        }).then(function (data) {
            var count = $(data).text();
            setCommentsText(count, itemId, url);
        });
    }

    function setCommentsText(count, itemId, url) {
        var comments = $('#' + itemId + ' .comments');
        comments.html("<span>(" + count + ") <a href='" + url + "'>Comments</a></span>");
    }