Loop through Section and Page in CRM 2015

var requiredAttributeNames =[];

    XrmPage.ui.tabs.get("CL_Configurations").sections.get("CL_Configurations").controls.get(

    function (ctrl, i) {

      

        var ctrlname = ctrl.getName();

        requiredAttributeNames.push(ctrlname);

      

           

    });

    var preferredmethodofcontacttypes = requiredAttributeNames.indexOf("gw_preferredmethodofcontacttypes");

   // alert(preferredmethodofcontacttypes);

    var taskorigintypes = requiredAttributeNames.indexOf("gw_taskorigintypes");

    //alert(taskorigintypes);

   var relationtypes = requiredAttributeNames.indexOf("gw_relationshiptypes");

loop through page 

Xrm.Page.ui.controls.get(
function(ctrl,i){
 if(ctrl.getControlType() == "subgrid")
  console.log(ctrl.getName()
  );
});

Reference -  

https://msdn.microsoft.com/en-us/library/gg328261.aspx

https://msdn.microsoft.com/en-us/library/jj602964.aspx