Question

I am using an IFD CRM2011 environment and I am following this MSDN example to query the ODATA endpoint to populate a dropdown menu within an IFrame.

Here is the code that populates the drop down list:

function GetQuestionSetList() {
    var query = '/Mhc_questionsetverSet?' +
      '$select=Mhc_name,Mhc_questionsetverId&$filter=statecode/Value eq 0';
    SDK.RestEndpointPaging
       .RetrieveRecords(query, ProcessReturnedQuestionSetVersions);
}

function ProcessReturnedQuestionSetVersions(retrievedQuestionSets) {
    for (var i = 0; i < retrievedQuestionSets.length; i++) {
        var questionSet = retrievedQuestionSets[i];
        var value = questionSet.Mhc_questionsetverId;
        var name = questionSet.Mhc_name;

        //add option to select list
        $('#selectQuestionSetVersion').append($('<option>')
                                      .attr('value', value)
                                      .text(name));
    }
}

After the SDK.RestEndpointPaging.RetrieveRecords(query, ProcessReturnedQuestionSetVersions); line executes I am prompted with this dialog:

At this point I can either enter my credentials or press cancel and the dropdown is populated. In the developer tools I notice this error in both cases:

SCRIPT5022: Exception thrown and not caught

mhc_json2.js, line 484 character 13

// If the text is not JSON parseable, then a SyntaxError is thrown.

            throw new SyntaxError('JSON.parse');  //line 484
        };
    }
}());

I can’t figure out why this dialog is appearing or why this error is being thrown.

Answer 1

After posting this, I just happened to check fiddler and discovered the problem. There are two calls to RetrieveRecords in my situation. The first call returns status 200 (success) but the second returns 401.

Here are the two calls:

https://alpha.ftg.com:5556//xrmservices/2011/organizationdata.svc/Mhc_questionsetverSet?$select=Mhc_name,Mhc_questionsetverId&$filter=statecode/Value eq 0

https://alpha.ftg.com:5556//xrmservices/2011/organizationdata.svchttps://alpha.ftg.com:5556/xrmservices/2011/organizationdata.svc/Mhc_questionsetverSet?$filter=statecode/Value%20eq%200&$select=Mhc_name,Mhc_questionsetverId&$skiptoken=1,’mhc_questionsetverid’,’%7B3F737386-54DF-DE11-A55C-00155D020C0D%7D’,’%7B7AF1B564-C3BF-DD11-8209-000BCDC54FC9%7D’

In the second call the server + odata endpoint are concatenated twice. The RetrieveRecordsCallback function is supposed to strip the server and endpoint url if the __next parameter is found as seen here:

MSDN explanation:

If a __next property is found the new URL with a $skiptoken is passed back to SDK.RestEndpointPaging.RetrieveRecords as the new filter parameter value so that the process is repeated for each set of records until the total >number of requested records is retrieved and the __next property is no longer returned.

if (null != retrievedRecords.__next) {
    // The existance of the '__next' property 
    //indicates that more records are available
    // So the originating function is called again 
    //using the filter value returned
    var filter = retrievedRecords.__next
        .replace(SDK.RestEndpointPaging.GetODataPath(), "");
   SDK.RestEndpointPaging.RetrieveRecords(filter, callback);
}

The SDK.RestEndpointPaging.GetODataPath() is appending an extra / between the server and endpoint parts of the url, but when the new filter parameter is returned that extra / has been stripped so the .replace function fails to replace the path and it gets appended a second time.

The fix was trivial. Just change the SDK.RestEndpointPaging.GetODataPath() function to this:

 GetODataPath: function () {
        /// <summary>
        /// Utility function to retrieve the path to the REST endpoint.
        /// </summary>
        var serverUrl = Xrm.Page.context.getServerUrl();

        //remove the extra '/' char if it exists
        if (serverUrl.match(/\/$/)) {
            serverUrl = serverUrl.substring(0, serverUrl.length - 1);
        }

        return serverUrl + "/xrmservices/2011/organizationdata.svc";
    },