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Office 365 SharePoint 2013 Online Update List Item Using REST API

To use the example in this blog, you'll need,

A SharePoint 2013 development environment (app isolation, which is required for On-Premises scenario) Visual Studio 2012 or Visual Studio 2013 with Office Developer Tools for Visual Studio 2012 or Napa (SharePoint Online only).

You'll also need to set full control add-in permissions at the Web scope. Only the users who have sufficient permissions to change list permissions (such as site owners) can run this add-in. 
  1. <script>  
  2. var siteUrl = 'http://gowthamr.SharePoint.com';  
  3. var listTitle = 'Tutorial List';  
  4. var itemid='5';  
  5. $(document).ready( function() {  
  6.     updatelistItem();  
  7. });  
  8.   
  9.   
  10. function updatelistItem() {  
  11.     $.ajax({  
  12.        url: siteUrl+"/_api/web/lists/GetByTitle("+listTitle+")/items(itemid)" , 
  13.         method: POST,  
  14.         body: { '__metadata': { 'type': 'SP.Data.TestListItem' }, 'Title': 'ListItemUpdated'},  
  15.         headers: {
  16.         Authorization: "Bearer " + accessToken  
  17.          X-RequestDigest: form digest value  
  18.         "IF-MATCH": etag or "*"  
  19.         "X-HTTP-Method":"MERGE",  
  20.         accept: "application/json;odata=verbose"  
  21.         content-type: "application/json;odata=verbose"  
  22.         content-length:length of post body  
  23.                   }
  24.    });  
  25. }  
  26. function successHandler() {  
  27.               
  28.     alert('Request updated Successfully.');  
  29. }   
  30.   
  31. function errorHandler(xhr, ajaxOptions, thrownError) {  
  32.     alert('Request failed: ' + xhr.status + '\n' + thrownError + '\n' + xhr.responseText);  
  33. }  
  34. </script>  
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