#OData- Calling SAP service that has Single sign on access.

we can do multiple call in same time. as AJAX is Async if you need to do a action after 1 or more call's success, use the below way.

Syntax
$.when( $.ajax( "/page1.php" ), $.ajax( "/page2.php" ) ).done(function( a1, a2 ) {

  // a1 and a2 are arguments resolved for the page1 and page2 ajax requests, respectively.
  // Each argument is an array with the following structure: [ data, statusText, jqXHR ]
  var data = a1[ 0 ] + a2[ 0 ];

  if ( /Whip It/.test( data ) ) {
    alert( "We got what we came for!" );
  }

});

https://api.jquery.com/jquery.when/

Implementation

    var async1 = DoGetCall('url 1 here');
    var async2 = DoGetCall('url 2 here');
    var async3 = DoGetCall('url 3 here');
    var async4 = DoGetCall('url 4 here');
    var async5 = DoGetCall('url 5 here');

    // create call to get all exixting COR detail
    $.when(async1, async2, async3, async4, async5).done(function (result1, result2, result3, result4, result5) {
        if (result1[2].status === 200 && result2[2].status === 200 && result3[2].status === 200 && result4[2].status === 200 && result5[2].status === 200) {
            response1 = JSON.parse(result1[2].responseText).data.employee;
            response2 = JSON.parse(result2[2].responseText).data.Man;
            response3 = JSON.parse(result3[2].responseText).data.d;
            response4 = JSON.parse(result4[2].responseText).data.XXX;
            response5 = JSON.parse(result5[2].responseText).data.YYY;
            try {
                globalToken = result1[2].getResponseHeader('X-CSRF-Token'); console.log(globalToken);
            } catch (e) { console.log(e); }

// write the logic here...

  }
        else {
        alert('Get failed to return'); 
        }


    }).fail(function (xhr, status, error) {
        if (xhr.status === 404) {
            errorMessage = error;
        } else {
            errorMessage = xhr.responseJSON.error.message.value;
        }

    });

function DoGetCall(url) {
       return $.ajax({
        type: 'Get',
        beforeSend: function (xhr, settings) {
            xhr.setRequestHeader('X-CSRF-Token', "Fetch");
        },
        cache: false,
        url: url,
        dataType: 'json',
        xhrFields: {
            withCredentials: true
        },
        crossDomain: true
    });
 }


  // Calling
allGetCalls.push(DoGetCall('url1');
allGetCalls.push(DoGetCall('url2');
                $.when.apply($, allGetCalls)
                    .done(function () {
                        $.each(arguments, function (i, data) {
                                     console.log(data[2]); //hr is the value returned by each of the ajax requests
                            getOutputList.push(data[2]);
                        });