react-example | react实例 | Frontend Framework library

At what I am trying to do is I have one table in data and I want to make in my below code when I select checkbox and click submit button then call api and fetch the data how can we do that any help on this.

My code here https://codesandbox.io/s/react-example-forked-o8tu5

I have this api https://mocki.io/v1/b512f8b8-64ab-46e4-9e0c-9db538a0ad9e

Can anyone suggest how to call api when I selcect checkbox row and then click button then data is fetched.

Can anyone help me out this

I would like to know what is the proper way to create several drop-down-menus (), with a loop, where i can then access their selected value through a button. I tried to recreate what I currently have in my code so i hope this is enough. (The reason i put elements in an array is because i use different arrays to generate a table with rows in my original code.)

Currently getValue(), that is trying to get the value from the 1st drop-down-menu, prints '' which is the initial value, even when i change the value from the menu. I think the problem is that putting them in array is causing them not to update their own value when changed. Is there a way to get around this problem?

This code is also causing this.state.value to only be set on the last drop-down-menu that was changed. I understand why this is happening but i don't know how to get around it.

I am trying to set the window dimensions during window resize event using a debounce method. It seems that the dimensions are set only the first time that the code runs. When i am trying to resize the window the dimensions does not change. I create a sandbox example https://codesandbox.io/s/react-example-ciq1l

I am trying to build an analog clock with the second hand rotating every second, min hand rotating 6deg every minute and hour hand rotating 6deg every 12 minutes.

Here's the codesandbox: https://codesandbox.io/s/react-example-d7mes?file=/Clock.js

Whenever the min hand's angle is either of these [72, 144, 216, 288, 360] (12 minute degrees), I rotate the hour hand by 6 degrees once.

This is what I'm doing:

I am trying to figure out if it's possible to capture input/checkbox onchange events and update the state from the same function? The reason behind this is that I am still learning React and would like to learn how to save the state properly.

I've tried to save the state the following way, but I am probably making some mistakes:

I'm working on a simple react app that allows playback of a set of mp3 files using the HTML audio tag and filtering of the set of mp3 files to allow the user to find the ones they want to play.

It works fine when no filtering is applied and I see an Audio player for each mp3 file. But when I filter the list of mp3 files, I see a correctly reduced list of audio players but they do not always play the correct file now.

For example, if I have three mp3s - A, B and C - and then I filter to just show B and C I now see two audio players. But they will play A and B, not B and C. And in this case, as A is filtered out, I want the app to show audio elements for B and C that actually play B and C.

I've put together some code in a React sandbox that I hope shows the problem. If you filter the mp3s in the sample app to just show the ukulele sound clip, it still plays the first mp3 when you click the play button.

https://codesandbox.io/s/react-example-5y0bp?fontsize=14&hidenavigation=1&theme=dark

I've seen this behaviour now on Chrome, Firefox and Edge. Even on Chrome on iOS.

Any ideas what's going on here? Or how I can prevent or work around this? Am I just missing something glaringly obvious? Any advice welcome.

Thanks.

I am trying to load images at the same time in React.js.

I tried a lot but still not able to figure out, how to do it.

1. This is the first thing, I tried to load images normally.

Here is a codesandbox for the problem.

The example has three parts:

• React functional component.
• Vanilla JS grid library.
• useEffect to combine them both.

One useEffect instantiates the grid, while another listens for state changes to update the grid.

Everything works fine until a row is clicked in the grid library.

I get this error.

I need a little help with my project. I think it is almost done, but I don't know how to finish...

So, I want to build app with input, select and button. Into input u can write for example, mettalica and after click on button app renders list with all songs, titles and tabTypes(guitar tabs). The problem is that i want to get info from select and render only that songs which includes for example player tabs.

Sandbox Code: https://codesandbox.io/s/react-example-ys6py?fontsize=14&hidenavigation=1&theme=dark