how to loop through item id and update items via CSOM

[Patrick Rote]

Here is my snippet code below.My aim is to simply loop through item ids and update the list in batches. I need help with using CSOM to do this I need this as currently when i send a batch of over 800 items i get timeout. Thanks in Advance

var items;
var oList;
var oListItem
function getItemsToBeUpdated()
{

  $('#lblprogress').text("Updating items please wait.... ");
  $('#lblprogress').show();

    var siteUrl = '/sites/MySite';

    var clientContext = new SP.ClientContext(siteUrl);
    //var clientContext = new SP.ClientContext.get_current();
   
     oList = clientContext.get_web().get_lists().getByTitle('PTest');
   
 var camlQuery = new SP.CamlQuery();
 camlQuery.set_viewXml('<View><Query></Query><RowLimit>100</RowLimit></View>');
    items = oList.getItems(camlQuery);
 clientContext.load(items);   
    clientContext.executeQueryAsync(updateMultipleListItemsSuccess, updateMultipleListItemsFailed);
        
   
   //This works but i need to send 17 items(using the itemid and then 13 items out of 30 for example etc..)
    for (var i = 1; i <= 17; i++) {

        this.oListItem = oList.getItemById(i);

        oListItem.set_item('Update', 'Force');

        oListItem.update();
       
        clientContext.executeQueryAsync(updateMultipleListItemsSuccess, updateMultipleListItemsFailed);
        

    }
   
    /*for (var i = 15; i <= 30; i++) {

        this.oListItem = oList.getItemById(i);

        oListItem.set_item('Force_x0020_Update', 'Force Update');

        oListItem.update();
       
        clientContext.executeQueryAsync(updateMultipleListItemsSuccess, updateMultipleListItemsFailed);
        

    }*/

}

//I can get the id here and use it onSucess but when i try updating here it doesnt work
function getID() {
  
   var itemEnumerator = items.getEnumerator();
    while(itemEnumerator.moveNext()){
        var item = itemEnumerator.get_current();
       
        // You now have the item you were looking for!
         console.log(item.get_item("ID"));
        
    }
  

}

function updateMultipleListItemsSuccess() {
  
   getID();

    $('#lblprogress').text("Items Updated Successfully");
    //alert('Items Updated');
    $('#reset').show();
   
  

}

    function updateMultipleListItemsFailed(sender, args)
    {   

     $('#lblprogress').hide();
     $('#lblerror').text('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
     $('#reset').show();

    }

[#2]

Patrick, try reducing the size of the batch to avoid the timeout issue. Try with for example 10 and then increase it if you need

[#3]

Thanks Joel and I get that. My above code works.
I'm just to on how to approach this dynamically. If you look at my code above i'm not iterating through the item ids.

I need a something that can iterate through this ids and then send them for update in batches.

Cheers