React | 入零门学习react，学习笔记，学习项目 | Frontend Framework library
kandi X-RAY | React Summary
kandi X-RAY | React Summary
早在一年前就有接触过 react，那时候我的知乎大神一直在推广 react，只是那时候的我刚刚入门前端，ES6 不熟，演绎了一场入门到放弃。后来因为毕业设计的原因入坑 vue，入职写 vue ，每次和朋友讨论的时候我只会说一句我只会 vue ，似乎我好像就局限在我曾引以为傲的 vue 中，心疼的是我 vue 好像也是一直停留在初学者水平。不把自己局限在 vue ，感受接受其他框架的力量。. 一直听说 vue 借鉴了其他两大框架的优点，真实情况我并不了解，因为我只会 vue，才入坑 react。可能是语言都是想通的，vue 没有我想象中那么高攀不起。. vue 中所有文件后缀名是 .vue, react 的文件直接是 js ，他们的引入方式一样，react 使用 JSX 语法，vue 和我们写原生的 html 更像,把 css JS HTML 放在一个组件里面，而 react 是写 js 一样书写组件. 对比 vue 学习 react. 在 vue 中，所有的数据定义在 data()，所有的this 指向 vue 构造函数（箭头函数除外），没有 this 绑定的问题，html 代码写在 元素当中，js 写在
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QUESTION
I am working on a React Web Application Where I fetch and display student data from an API and I keep getting the error,
Warning: Each child in a list should have a unique "key" prop. Check the render method of Accordion
Accordion.js being one of my components of my Web Application
Any Help to fix this issue would be appreciated :)
I have tried passing a key prop with an id to the Accordion component from a parent component, but that did not seem to work. Could it be that I need to pass a key in my test score paragraph?
...ANSWER
Answered 2021-Jun-15 at 23:21On line 23
Make the following change
QUESTION
I am running the following in my React app and when I open the console in Chrome, it is printing the response.data[0] twice in the console. What is causing this?
...ANSWER
Answered 2021-Jun-16 at 02:48You have included fetching function in the component as it is, so it fires every time component being rendered. You better to include fetching data in useEffect hook just like this:
QUESTION
Can someone help me investigate why my Chainlink requests aren't getting fulfilled. They get fulfilled in my tests (see hardhat test etherscan events(https://kovan.etherscan.io/address/0x8Ae71A5a6c73dc87e0B9Da426c1b3B145a6F0d12#events). But they don't get fulfilled when I make them from my react app (see react app contract's etherscan events https://kovan.etherscan.io/address/0x6da2256a13fd36a884eb14185e756e89ffa695f8#events).
Same contracts (different addresses), same function call.
Updates:
Here's the code I use to call them in my tests
...ANSWER
Answered 2021-Jun-16 at 00:09Remove your agreement vars in MinimalClone.sol, and either have the user input them as args in your init() method or hardcode them into the request like this:
QUESTION
const set = firebase.firestore().collection("workoutExercises").doc(firebase.auth().currentUser.uid).get()
console.log(set)
ANSWER
Answered 2021-Jun-15 at 23:56Firebase calls like this are asynchronous, meaning they don't return immediately. In Javascript, you can deal with this in a couple of different ways, using async/await or Promises.
Here's an example using a Promise:
QUESTION
I have the wackiest bug. Like....the wackiest! If any of ya'll want to put eyes on this, awesomesauce! I really appriciate it! I am creating a survey with REACT, Redux, SQL, HML, Material-ui, and CSS.
I've created a graph of information with am4charts using data from a database. Everything is working and will show up on the page......but not on page load. What I am seeing in my console is that the page will load, it fires off my get request but doesn't return with the data fast enough (I think). By the time that the get request loads, my graph has populated with no data.
Here is the code that I have for the page that I am rendering. What is really odd is that, once my code has run, I can cut a line of code (I've been using a console log). And then the graph will render and load.
...ANSWER
Answered 2021-Jun-15 at 22:40Can you try this fix? I created new functions for some tasks.
https://codesandbox.io/s/vigorous-varahamihira-6j588?file=/src/App.js
QUESTION
I've been struggling with this all over my react-native app, so I set up a very simple example of it in codesandbox which you can view here:
https://codesandbox.io/s/elastic-star-5754q?file=/src/App.js
Within the View with the green background, all of the internal views are centered horizontally within their respective spaces as I would expect thanks to the "alignItems: center" style property. I would expect that I could also center them vertically within their spaces by setting "justifyContent: center", but that doesn't seem to work for me.
Am I fundamentally misunderstanding something?
...ANSWER
Answered 2021-Jun-15 at 21:59The problem is that you are not aligning the text within the individual Views. Your example mistakenly aligns the inner View elements within the larger View element rather than aligning the text.
To center-align the text vertically within their Views you just need to add justifyContent: "center" to those individual three green Views.
Here's an example: https://codesandbox.io/s/recursing-kirch-n8one?file=/src/App.js:393-417
To further explain why you were experiencing the issue you did, see this screenshot with boxes outlining the space the elements were taking up on-screen:
You can see the inner Views are only taking up the needed width of the text elements inside, but are using the max height available to them.
QUESTION
I am working in react application and founded this stubborn thing. This is my state in react to which i am working on
...ANSWER
Answered 2021-Jun-15 at 20:51You seem to be confusing useState with the class component's state.
Running setState({ testInfo: testInfoArray }); sets the entire state to { testInfo: testInfoArray }, removing state.selectedParagraph entirely, causing it to be undefined.
You'll want to use useState multiple times, like this:
QUESTION
I'm trying to somehow test a hooked file that uses an Apollo client connection entry and GraphQL:
See the error:
...
ANSWER
Answered 2021-Jun-15 at 20:47I finally found the solution to the problem:
QUESTION
I'm trying to implement a Select component using reactjs material ui and typescript.
However, I am getting the following typing error:
...ANSWER
Answered 2021-Jun-15 at 20:40From what it looks like, options is actually an array of objects rather than just an object. So all you would need to do is map over the options variable. You are currently using Object.keys which is what you use if you are wanting to iterate over the keys in an object.
QUESTION
I'm using React and Next.js with Firestore. On one page I get data from Firebase with useEffect only once the page is rendered. But since the get is kind of costly (lots of read), I want to persist the data fetched even when the user navigates to other pages and back to this page, so that I don't need to fetch again. How can I do that? Thanks!
...ANSWER
Answered 2021-Jun-15 at 19:03There are multiple ways but one good way would be to use Context, create a data store context which would store your data and then you can read from it as a single source of truth.
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