To update a record using jQuery, use the following code. You will need to pass the GUID of the record you are updating as well as the type of entity. This example updates an account record name:
function updateAccount() {
var context = Xrm.Page.context;
var serverUrl = context.getClientUrl();
var guid = Xrm.Page.data.entity.getId();
var endpoint = "/XRMServices/2011/OrganizationData.svc";
var account = new Object();
var collection = "/AccountSet";
account.Name = "New Updated Name";
var jsonEntity = window.JSON.stringify(account);
if (typeof($) === 'undefined') {
$ = parent.$;
jQuery = parent.jQuery;
}
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
datatype: "json",
url: serverUrl + endpoint + collection + "(guid'" + guid + "')",
data: jsonEntity,
beforeSend: function(XMLHttpRequest) {
XMLHttpRequest.setRequestHeader("Accept", "application/json");
XMLHttpRequest.setRequestHeader("X-HTTP-Method", "MERGE");
},
success: function(data, textStatus, XmlHttpRequest) {
alert("success");
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert("failure");
}
});
}

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