Get next item ID from a SharePoint Document Library using REST

Environment: Using jQuery, REST, SharePoint 2013 Enterprise, knockout JS

Requirement: To get the next item ID from a SharePoint Document Library using REST

Prerequisite: knockout and latest jQuery are defined in the code.

Code:

function getNextSequenceID() {

              

var documentLibraryName = 'DocumentLibraryName';     

               var serverUrl = window.top._spPageContextInfo.webServerRelativeUrl;

              

               //Query the top 1 item sorted in descending order.

               var fileListItemIDUri = serverUrl + "/_api/web/lists/getbytitle('" + documentLibraryName + "')/items?$select=ID&$top=1&$orderby=ID%20desc";

               var sequenceID = 1;

                                            

                              return $.ajax({

                                             url: fileListItemIDUri,

                                             type: "GET",

                                             headers: { "accept": "application/json;odata=verbose" },

                                             success: function (data) {

                                             if(data.d.results.length==1)

                                             {

                                                            var id = data.d.results[0].ID;

                                                            sequenceID = id+1;

                                             }   

alert(“The next item ID is :”+ sequenceID);

        },

        error: function (data) {

        },

        });

};

Create a folder in a document library using REST

Environment: Using jQuery, REST, SharePoint 2013 Enterprise, knockout JS

Requirement: Create a folder in a document library with current year as the folder name using REST. Check if folder exists already, else create a new folder.

Prerequisite: knockout and latest jQuery must be defined.

Code:

var currentYear = ko.observable();
var documentLibraryName = “DocumentLibraryName”;   
var serverUrl = “http://webServerURL”;

//Following code should be executed on page load
self.currentYear = ko.computed(function () {

               currentYear = (new Date).getFullYear();

               return (new Date).getFullYear();

});

//fileUpload method is used to upload a file to a folder in SharePoint document library

self.fileUpload = function () {

self.doesFolderExist();

….

….

…

};

//doesFolderExist method is used to check if the folder already exists in the document library and create a new folder if does not exist.
self.doesFolderExist = function (){

                                            

              

               var fileCollectionEndpoint = serverUrl + "/_api/web/getfolderbyserverrelativeurl('" + documentLibraryName +"/"+currentYear+ "')";

               return $.ajax({

               url: fileCollectionEndpoint,

               type: "GET",                      

               headers: {

                              "accept": "application/json;odata=verbose",

                              "X-RequestDigest": window.top.$("#__REQUESTDIGEST").val()

                              },

                              success: function (data) {

                                             alert("Folder already exists");

                      },

               error: function (data) {

                              //Folder does not exist, so create a new folder

                              self.createFolder();

        }

});

};

//Create a folder in document library
self.createFolder = function ()

{

                             

               var fileCollectionEndpoint = serverUrl + "/_api/web/getfolderbyserverrelativeurl('" + documentLibraryName + "')/folders/add(url=\'" + currentYear + "\')";

                                            

               return $.ajax({

                              url: fileCollectionEndpoint,

                              type: "POST",

                              headers: {

                                             "X-RequestDigest":  window.top.$("#__REQUESTDIGEST").val(),

                                             "accept": "application/json;odata=verbose",

                                             "content-type": "application/json;odata=verbose"

                              },

                              success: function (data) {

                                             //alert(‘Folder created successfully’);

                                             },

                                              error: function (jqXHR, textStatus, errorThrown) {

                                                            //handle error...

                                                            alert('Failed to create folder in library.');

                                             }

                              });

               };

References:

https://msdn.microsoft.com/en-us/library/office/dn292553.aspx

https://msdn.microsoft.com/en-us/library/office/dn769086.aspx