Build a Live Search Box with useBroadcaster and useListener in React

Fixing Bugs in Our Live Search Box

Create an ifElse Operator to Fork on a Condition

Merge Multiple useListener Hooks in React

Compare useBroadcaster and useListener to the Standard React Hooks

Remember to Check for Done

Save Network Requests by Using a Cache

Fix Race Conditions Due to Caching and Canceling

Building Live Search Box

When building out asynchronous scenarios, it's really important to make sure they're behaving exactly the way you want. Checking the number of network requests, event handlers, and timing of everything will help you track down bugs.

Instructor: [0:00] If we look in the Network tab, we do notice we exposed a bug here. This is making two requests. This must mean we didn't handle a done scenario.

[0:10] If we look in this createTimeout, you'll notice we don't handle done, which means the listener's called twice with a value. The reason it's called twice is because in createTimeout, if I Command-click on that, you'll see it does that first call and then it passes in done.

[0:27] We need to handle that done scenario inside of our waitfor. That means we have an innerValue here, which if the innerValue = done, then we must guard against that. When I hit Save and I type STAR, you'll see only one request coming through.

[0:50] Another bug we have is if we delete all of this, it still makes a search for nothing. I'd also like to prevent it from making searches if I only type a single character, because that's just way too many results. Maybe even limit it to something like four characters.

[1:07] For that, before we construct the URL when we only have a name, we can filter on that name and only allow if the name.length is greater than three characters. We need to import filter from our operators. Import filter right there.

[1:28] Now I can type S and it won't do a search. I can type TA, it still doesn't do a search. I can type R, and now it finally makes that search for me. Everything else works as expected.

Course

Building Live Search Box

Fixing Bugs in Our Live Search Box

Share this video with your friends