Paging in Dynamic 365 CRM using JavaScript

The paging works differently depending on whether you’re performing a straight Rest API query or using FetchXML in the request.

Paging Rest API Queries example.

Item count per page is specified using odata.maxpagesize=x when setting Request Header.
It is ideally used when showing result in a GRID and using pagination to display next set of records.
If odata.maxpagesize is not mentioned Dynamic CRM default maxpagesize is 5000 records.
odata.maxpagesize Does NOT work for Fetch XML request

httpRequest.setRequestHeader("Prefer", "odata.maxpagesize=10");

To fetch next set of record we need to open a new request specified in @odata.nextLink attribute
@odata.nextLink does not applies when request is of Fetch Xml

JSON.parse(httpRequest.responseText)["@odata.nextLink"]

For Pagination with FetchXml refer here

For jumping to specific page in pagination refer here

CODE EXAMPLE for Select Clause

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

// sample function to return all the leads

function GetAllLeadsViaSelectQuery()

{

  var selectLeadQuery = "$select=fullname,leadid";

  var leadsQueryUrl = serverUrl + "/api/data/v9.1/leads?" + selectLeadQuery;

  // call our new method

  var retrievedLeads = getallRecords(leadsQueryUrl);

  alert(retrievedLeads.results.length);

  alert(retrievedLeads.results[0].fullname);   

}

function getallRecords(OriginalQueryUrl)

{

// we return an object with a similar structure

var allRecords = new Object();

allRecords.results = new Array();

// we loop until we have an url to query

var queryUrl = OriginalQueryUrl;

while (queryUrl != null)

{

    // we build the request

    var httpRequest = new XMLHttpRequest();

    httpRequest.open("GET", queryUrl, false); // false = synchronous request

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

    httpRequest.setRequestHeader("OData-MaxVersion", "4.0");

    httpRequest.setRequestHeader("OData-Version", "4.0");

    httpRequest.setRequestHeader("Content-Type", "application/json; charset=utf-8");

    httpRequest.setRequestHeader("Prefer", "odata.include-annotations=\"*\"");

   httpRequest.setRequestHeader("Prefer", "odata.maxpagesize=500");

    httpRequest.send();

    if (httpRequest.status === 200) {

        var parsedResults = JSON.parse(httpRequest.responseText);

        if (parsedResults != null && parsedResults.value != null)

        {

            // we add the results to our object

            for (var i = 0; i < parsedResults.value.length; i++)

            {

                allRecords.results.push(parsedResults.value[i]);

            }

            //JSON.parse(httpRequest.responseText)["@odata.nextLink"]

            // check if there are more records and set the new url, otherwise we set to null the url

            if (parsedResults["@odata.nextLink"] != null && parsedResults["@odata.nextLink"] != 'undefined') {

                queryUrl = parsedResults["@odata.nextLink"];

            }

            else {

                queryUrl = null;

            }

        }

    }

    else

    {

        // if the request has errors we stop and return a null result

        queryUrl = null;

        allRecords = null;

    }

}

return allRecords;

}