t-io | 网络编程很苦，用t-io后会很甜 | Websocket library

I am creating a post upload page that needs to detect when the user types the "@" symbol so it can search the database for the username. My code works for the first "@" in the string but does not work for any additional ones. I want the user to be able to tag as many usernames as they would like. For example: Hey @John did you talk to @Jim today?

This is what I am looking for but it is out of date: How to get substring after last occurrence of character in string: Swift IOS

current code:

I just upgraded to latest flutter version 2.2, and now this piece of code is not working.

Before all, yes I have checked other posts like this, this or even this among others.

This being said, let me expose my case:

It works on the dev-env (localhost) completely fine (of course, it doesn't require any proxy)

I also use this curl command to confirm:

as given in Sending message to a specific ID in Socket.IO 1.0, it is possible to emit to a specific client id by using

I have two sides.

In one side I have direct usage of WebSocket protocol by using libraries/packages like ws (a Node.js WebSocket library) or Socket.io. Here I can use test tools to subscribe against and address starting with ws or wss like ws://localhost:8080 and receive updates.

In other side, I use GraphQL Subscription by using components like ApolloGraphQL. It seems that this way I should use something embedded in GraphQL. Projects developed with this way can not be accessed via ws:// or wss:// addresses, or at least I am not aware of.

My questions is what are differences between two? Are GraphQL Subscription is built on top of WebSocket? If yes, how? How can I access a GraphQL Subscription via ws:// or wss:// urls?

UPDATE: I have read this and this question before, but they did not helped a lot.

I need a hidden delete button to appear and work when a input is focused using markup and CSS in Svelte.

I got it all working in browsers for OS X and Raspberry Pi OS (Chrome, Chromium, Safari and Firefox). Click here to see it.

The problem is that the button appears but is not working in any of my iOS browsers (Safari or Firefox). Nothing is happening when the delete button is clicked.

I've tried following:

• focus-within works on Android browser but not iOS
• How to make a button appear only when input is focused

Here is the markup...

I have a Kotlin Multiplatform Mobile library that I published to Maven Central. I am also trying to use this library in a non-KMM Android app. When I declare the dependency in the android app I get this error

I have a Landsat Image and an image collection (3 images: static in time but each partially overlapping the Landsat image) with one band and want to add this one band to the Landsat image.

In a traditional GIS/python df I would do an Inner Join based on geometry but I can't figure out how this might be carried out on GEE.

Neither the image or the collection share any bands for a simple join. From what I gather a spatial join is similar to a within buffer so not what I need here. I've also tried the Filter.contains() for the join but this hasn't worked. I tried addBands() despite expecting it not to work and it results in TypeError: 'ImageCollection' object is not callable:

I've been learning flask-socketio. The aim is to make a p2p-like (should not be correctly saying) chat app using socket-io which works in a LAN. All the users have static IP address which everyone knows. There are 4 devices in LAN. Each going to install the flask-app in their own system. This is the app.py and chat.html(client in JS)

This is the app.py