How to post Data in SharePoint list using ajax with jQuery ?

Post Data in a SharePoint list Using jQuery:



Requirements:
i) SharePoint List Name
ii) Id for the data
ii) List EntityType Name**
Just fullFill the above requirement and you will able to post data in List.


function saveData(id,listName){
      var requestUri = _spPageContextInfo.webAbsoluteUrl + "/_api/Web/Lists/getbytitle('"+listName+"')/Items('" + id + "')";
      $.ajax({
        url: requestUri, // list item ID
        type: "POST",
        data: JSON.stringify({
          __metadata: {
                type: "SP.Data.College_x0020_DataListItem"//// it defines the ListEntityTypeFullName
          },
          'Name'                   : 'Rajparam',
          'Age' : 25,
          'Branch':'Computer Science',
          'Year':'Final Year',
          'Fees':4500
        }),
        headers: {
          "Accept": "application/json;odata=verbose",
          "Content-Type": "application/json;odata=verbose",
          "X-RequestDigest": $("#__REQUESTDIGEST").val(),
          "IF-MATCH": "*",
          "X-HTTP-Method": "MERGE",
        },
        success: function (data, status, xhr) {
           alert("Records are saved Successfully.")
        },error: function(err){
             console.log(JSON.stringify(error)); 
        }
      });
    }
   var Id= Data.ID
   var listName='College Data'
    saveData(Id,listName);





** Use this Below url to get ListItem EntityTypeFullName
Just replace listName and prefix the SharePoint site Url and hit this to Browser

siteurl(AbsoluteUrl) + /_api/Web/Lists/getbytitle('ListName')/ListItemEntityTypeFullName