Is there a way to wait for the async operation in this code snippet and use its result as the predicate instead of always returning false?
return someList.createFiltered(function(item) {
var filter = false;
var promise = someOperationAsync();
promise.done(function(b) {
filter = b;
});
return filter;
});
Unfortunately, the WinJS.Binding.List does not support async predicates. One possible solution could be to create a loop at the end of the process that watches a Boolean flag set in both the completed handler and error handler. In this scenario, an error handler would need to be used on the promise to change the flag.
Have you considered caching the results of the async call when the app initializes? This way, you could perform a synchronous lookup against the cached data instead.
To properly handle asynchronous operations, it is important to return the promise and then use 'then' or 'done' in the calling function.
Another approach could be placing return filter; within the promise.done block, but this would result in synchronous behavior as you would have to wait for the promise to resolve before returning.
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