Create Item in SharePoint 2019 list from external website.

Question

Dear Experts,

I have SharePoint 2019 On premise site and i want to create an item in SharePoint List from external website (External website has custom html/JS forms) from which user submit the item and i want to store this information in my sharepoint 2019 list.

How can we achieve this, kindly help.

Note : I don't have Power Automate and Azure Option

Answer 1

You can use the SharePoint Rest API option, below article for your reference.

function addListItem() {
               var myListUrl= "mysite.sharepoint.com/_vti_bin/listdata.svc/myList";    
               var item= {};
               item.Title = "Adding an item using 2010 REST API";

               var itemEntry= JSON.stringify(item);

               $.ajax({
                   type: "POST",
                   url: myListUrl,
                   data: itemEntry,
                   contentType: "application/json; charset=utf-8",
                   success: function () {
                       //do stuff here

                   },

                  error: function() {
                     //do some error handling here
                  }

               });
           }

https://stackoverflow.com/questions/36727356/write-to-a-sharepoint-list-from-an-html-page-that-is-not-located-within-the-shar

Thanks & Regards,

Answer 2

Hi @Anonymous ,

You need to consider cross-domain issues to call SharePoint rest-api from external site. There are a few approaches to solve this:

• CORS (Cross-origin resource sharing)
• JSONP (JSON with padding)
• IFrame with PostMessage API

Please refer to this article for more information:

https://www.vlieshout.net/how-to-gather-data-from-sharepoint-using-rest-api-on-external-website/

Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.

---

If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 3

if you want to save request from javascript you will need to solve problem with CORS (I assume that external site and Sharepoint site use different domain names). There is simpler option but it will require adding server-side code to your external site: e.g. you may add .ashx handler (it will work for sites created in ASP.Net), call this handler from javascript (there won't be CORS issues because ashx handler and javascript code will run on the same domain), from ashx handler add item to external Sharepoint list using C# and CSOM. For authentication you may use app-only permission (based on client id and secret).