MS CRM

To Update a record in CRM, we require JQuery min 1.4 &  JSON2 script file which we can get from SDK from this specific path

Now add the following code to your web resource.
Also add JSon.js and Jquery1.4min.js to the Library

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function update()

{

var lookupObject = Xrm.Page.getAttribute("new_lookup").getValue();   //getting the id through lookup

var id = lookupObject[0].id;

var obj = new Object();

obj.new_name = "Hello";

var set="your entity schema nameSet"

updatelog(id,obj,set);

}

function updatelog(id,obj1,odata)

{

var jsonEntity = window.JSON.stringify(obj1);

var serverUrl = window.parent.Xrm.Page.context.getClientUrl();

var ODATA_ENDPOINT = "/XRMServices/2011/OrganizationData.svc";

$.ajax({

                                type: "POST",

                                contentType: "application/json; charset=utf-8",

                                datatype: "json",

                                data: jsonEntity,

                                url: serverUrl + ODATA_ENDPOINT + "/" + odata + "(guid'" + id + "')",

                                beforeSend: function(XMLHttpRequest)

                                {

                                                XMLHttpRequest.setRequestHeader("Accept", "application/json");

                                                XMLHttpRequest.setRequestHeader("X-HTTP-Method", "MERGE");

        }

                                success: function (data, textStatus, XmlHttpRequest) {

                                alert("Updated successfully");

                                },

                                error: function (XmlHttpRequest, textStatus, errorThrown) {

                                if (XmlHttpRequest && XmlHttpRequest.responseText) {

                                alert("Error while updating " + odataSetName+ " ; Error – " + XmlHttpRequest.responseText);

                                }

                                }

                });

}