如何在NativeScript Vue中重新启用RadListView的按需加载？

Fix for Re-enabling RadListView Load On Demand After a New Query #

Hey Andrew, I’ve dealt with this exact RadListView load-on-demand issue before, so I know exactly what you’re going through! Let me break down the solution for you:

Why this happens #

When you call notifyLoadOnDemandFinished(true) after loading your initial dataset, you’re telling RadListView "there’s no more data to load for this query". That state sticks around even when you switch to a new search, which is why the auto load-on-demand stops working.

How to reactivate it #

You just need to reset that "no more data" state when you trigger a new query. Here’s the step-by-step:

• Right before fetching new data (or immediately after clearing the old dataset), call this method:

  // Replace 'radListView' with your actual component reference
  radListView.notifyLoadOnDemandFinished(false);
  

  Passing false here tells the component "there is more data to load", which flips the switch back to enable auto load-on-demand.

• Load your new dataset as you normally would—replace the old data array with the results from your new query.

• Optional: Force a refresh if the ListView doesn’t update right away:

  radListView.refresh();
  

This works because you’re essentially telling RadListView to forget the previous "end of data" state and get ready to load more items for the new query. I’ve used this trick in both Angular and Vue NativeScript projects with RadListView, and it’s never failed me.

内容的提问来源于stack exchange，提问作者Andrew McCarthy