Display posts in descending posted order

Question

I\'m trying to test out Firebase to allow users to post comments using push. I want to display the data I retrieve with the following;

fbl.child         


        

Answer 1

Firebase: How to display a thread of items in reverse order with a limit for each request and an indicator for a "load more" button.

• This will get the last 10 items of the list

FBRef.child("childName") .limitToLast(loadMoreLimit) // loadMoreLimit = 10 for example

• This will get the last 10 items. Grab the id of the last record in the list and save for the load more functionality. Next, convert the collection of objects into and an array and do a list.reverse().

• LOAD MORE Functionality: The next call will do two things, it will get the next sequence of list items based on the reference id from the first request and give you an indicator if you need to display the "load more" button.

this.FBRef .child("childName") .endAt(null, lastThreadId) // Get this from the previous step .limitToLast(loadMoreLimit+2)

• You will need to strip the first and last item of this object collection. The first item is the reference to get this list. The last item is an indicator for the show more button.

• I have a bunch of other logic that will keep everything clean. You will need to add this code only for the load more functionality.

    list = snapObjectAsArray;  // The list is an array from snapObject
    lastItemId = key; // get the first key of the list
  
    if (list.length < loadMoreLimit+1) {
      lastItemId = false; 
    }
    if (list.length > loadMoreLimit+1) {
      list.pop();
    }
    if (list.length > loadMoreLimit) {
      list.shift();
    }
    // Return the list.reverse() and lastItemId 
    // If lastItemId is an ID, it will be used for the next reference and a flag to show the "load more" button.
  }