EventEmitter | Evented JavaScript for the browser | Pub Sub library
kandi X-RAY | EventEmitter Summary
kandi X-RAY | EventEmitter Summary
Evented JavaScript for the browser
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QUESTION
I have a custom slide toggle component created using Angular Material. I followed this guide: https://material.angular.io/guide/creating-a-custom-form-field-control
Everything seems to be working fine except when I dynamically disable the custom component like this:
...ANSWER
Answered 2021-Jun-11 at 19:49You need to add a formGroup binding to your custom component,
QUESTION
I'm using axios in my app. When I make a post request for the very first time after opening the app, it is failing with the following error. From second time onwards, it works without any issue.
...ANSWER
Answered 2021-Jan-18 at 05:56Make Sure "http://" is in your URL Address .
- change from localhost to your ip
- add http://
http://192.168.43.49:3000/user/
Solution 2I faced same issue, it happens in Android, but works well in IOS. I guess this issue about Flipper Network.
For while, I commented
initializeFlipper(this, getReactNativeHost().getReactInstanceManager())
in this file
/android/app/src/main/java/com/{your_project}/MainApplication.java
Whoever is still struggling with this issue. it's happening because of Flipper network plugin. I disabled it and things work just fine.
My workaround to make this work is commenting out line number 43
QUESTION
I'm currently building a desktop application with Electron and React.
Right now I'm adding a menu feature which toggles the dark mode of the app. In my React app, I'm using a hook which toggles the dark mode. I want to trigger that React hook right after the user has clicked on the menu item.
This is what I've done so far:
menu.ts:
...ANSWER
Answered 2021-Jun-13 at 08:37Try setting up the toggle-dark-mode
event handler once when you start your Electron app.
Your code doesn't need to be in the ready
event even.
QUESTION
Consider the following code:
...ANSWER
Answered 2021-Jun-13 at 18:47Internally, the EvenEmitter
hold an array of listeners for each event type. When you emit an event type, the EvenEmitter
just goes through it's array of listeners and execute it. Therefore, the listeners are executed in the order it was added by addListener
or on
method.
To answer your questions there are two parts: a) it executes in the order you added the listener and b) it depends if the listeners are async or not. If your listeners are synchronous, then you can expect that behavior. If your listeners are async, you can't expect that. Even if your execute your async synchronously, they will not necessarily resolve at the same time because it's the nature of being async.
QUESTION
So
Console:
...ANSWER
Answered 2021-Apr-22 at 20:32I have had the same issue. This is what I did:
- I deleted the
migrations
folder as well as thedist
folder - I ran
npx mikro-orm migration:create --initial
After that, I restarted yarn watch
and yarn dev
and it worked for me.
Notice the --initial
flag. I would recommend to check the official documentation. The migrations table is used to keep track of already executed migrations. When you only run npx mikro-orm migration:create
, the table will not be created and therefore MikroORM is unable to check if the migration for the Post entity has already been performed (which includes creating the respective table on the database).
Ben does not use the --initial
flag in his tutorial, he might have already ran it prior to the tutorial.
QUESTION
I have been trying to install Angular but everytime this part:
@angular/cli@12.0.3 postinstall C:\Users\Marco\AppData\Roaming\npm\node_modules@angular\cli
node ./bin/postinstall/script.js
Seems to throw an error. I'm not sure if I need this to work or not so I'll leave the last couple lines of the log here.
...ANSWER
Answered 2021-Jun-12 at 16:10I fixed it by going to the actual file location of script.js and running the node command with that path. Like this:
node AppData/Roaming/npm/node_modules/@angular/cli/bin/postinstall/script.js
Actually that only helped a little bit. The problem was I was trying to install Angular using ConEmu GitBash and I should've been using cmd.
QUESTION
I have a cloud function that is calling a complex task (with many differents asynchronous tasks). At the end of those tasks, an event 'finished' is sent and catched by the cloud function that will terminate such as :
...ANSWER
Answered 2021-Jun-10 at 15:53The answer you linked talks about the Cloud Functions lifecycle.
When you make a request to your function, the Cloud Functions gateway checks if any "Cloud Function Executors" are idle/stale/inactive. If none are idle, a new executor is cold-started and is sent the request. If one is idle, that executor is sent the request instead to save having to cold-start a new executor. When handling a request, you tell the gateway "I'm finished" by sending back a result (for a HTTPS Event Cloud Function, this is done by using res.end()
or one of its variants; for most other Cloud Functions, this is done by resolving the returned Promise
chain).
Once you've sent a result back, that "Cloud Function Executor" is marked as idle. When idle, any network requests are blocked and that executor may be shut down (terminated) at any time. As described above, an idle function may be marked active again if it handles another request which can lead to bizarre side effects if you haven't handled the lifecycle flow properly.
So to handle the flow properly, you need to follow these steps:
- Validate the request (check for retries, syntax errors, missing authentication) and cancel it as necessary.
- Do all of the work that you need to do.
- Send back the appropriate result.
If the work that you need to do is expected to take a while, write a description of the job to your database (Firestore/RTDB) so it can be handled by a different Cloud Function triggered by the write to the database, and then send back the result as a description of where to look for updates on that job.
Looking at your code, eventEmitter
seems to be defined as a global object that spits out "finished"
events when it has finished doing the work in doSomethingComplex()
. When myFunction
is triggered the first time, all is well. But if myFunction
gets reused, a second "finished"
event will get fired. This works fine for the current request, but the request from earlier is still subscribed to eventEmitter
and tries to send a second response resulting in the error you are seeing.
You have three options:
- Subscribe to only one "finished" event. (Solution Rating: Bad) (Think about if it fails and but a later request succeeds)
- Return a private version of
eventEmitter
fromdoSomethingComplex()
. (Solution Rating: Okay) - Convert
doSomethingComplex()
into aPromise
-returning function. (Solution Rating: Best)
QUESTION
I am working on a recipe app with angular, and trying to set up communication with backend services using HTTP. I have been following along with angular documentation to set this up, here is the link https://angular.io/guide/http#sending-data-to-a-server. When I add in the code to make a POST request, I get the following error:
...ANSWER
Answered 2021-Jun-08 at 17:59Based on the comments and the code, you've got a bit of a mess.
First off, your service should not have an @NgModule
declaration: it's a service, not a module. Further, since your service isn't providedIn: "root"
, you need to actually provide it in your module.
Assuming AppModule is where this component and this service both live, you should have an app.module.ts something like this:
QUESTION
Update: https://github.com/cypress-io/cypress/issues/1065#issuecomment-351769720 Removing an import from my commands.ts fixed it. Thanks
I'm trying to convert my cypress project to use TypeScript. I'm following the info on https://docs.cypress.io/guides/tooling/typescript-support#Types-for-custom-commands
I've fixed all the other compilation errors I was getting but I'm still unable to get any of my custom commands to work for example:
commands.ts:
...ANSWER
Answered 2021-Jun-08 at 13:08You have to add your custom commands like this. You can check out the discussion here - https://github.com/cypress-io/cypress/issues/1065#issuecomment-351769720 -
QUESTION
I have a prime-ng table of shops, where I can remove and add shops to a list.
The behavior: When a shop is added, the ChildComponent
emits an event to ParentComponent
which then adds the shop to the list and updates the input observable of the ChildComponent
so that the shop no longer appears in the table.
The issue: The above behavior works fine except when the table is filtered, then when adding a shop the table is not updated even though I can see that the table array has been updated correctly in the component. However, when another shop is added (in the same filtered table) it works fine, and then both shops are removed from the table.
The table is part of a pure component (child):
...ANSWER
Answered 2021-Jun-08 at 11:21I followed the answer in this question and it worked for me, but I still don't fully understand why it didn't work on first addition then it worked on the next ones previously.
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