reactjs

问题 i had tried to implement to upload the multiple images but when i upload an image the image get randomly uploaded without cropping .so i had implemented react-easy-crop so when i tried to open the image cropping part is not opening i have tried the state method to open image but i am not understanding where i am getting wrong . i had implement image cropping before uploading an image . using react-easy-crop but its directly uploading the image without cropping below is the sandbox and code.

问题 I have a problem where I'm trying to store a component into my state and also pass a callback function as its props so that it can be called inside CustomComponent. Here's what I did: state = { tabs: [ { tabID: '1', component: <CustomComponent testCallback={this.callbackHandler} />} ] } callbackHandler = () => { .... } But when I try to call the function inside CustomComponent ( this.props.testCallBack() ), it tells me this is not a function. Is it OK to store a component inside state like

问题 I'm using react-router to set up my application, and try to use <Redirect/> to set router for authentication. Route component have two different components, one is private Route , another is public route . Expect result : when auth is false, the page should jump back to a public page, which I set <Redirect to={"/public"} /> so far it seems route works fine, but redirect doesn't work properly. Any ideas are welcome! Thanks!! PrivateRoute interface PrivateRouteProps { isLogin: boolean;

问题 I have a React app that is trying to make an axios request to my Express server to find a user in a Mongo database. Before, I built the back-end on Rails and had a gem for CORS, and after trying to configure CORS on the Express side, I can't seem to find a solution. I want to be able to pass in a custom field in headers (i.e. username) so I can use that field to query against my database. Error I get in browser: XMLHttpRequest cannot load http://localhost:3000/api/users/test. Request header

问题 I have a React app that is trying to make an axios request to my Express server to find a user in a Mongo database. Before, I built the back-end on Rails and had a gem for CORS, and after trying to configure CORS on the Express side, I can't seem to find a solution. I want to be able to pass in a custom field in headers (i.e. username) so I can use that field to query against my database. Error I get in browser: XMLHttpRequest cannot load http://localhost:3000/api/users/test. Request header

问题 I have a React app that is trying to make an axios request to my Express server to find a user in a Mongo database. Before, I built the back-end on Rails and had a gem for CORS, and after trying to configure CORS on the Express side, I can't seem to find a solution. I want to be able to pass in a custom field in headers (i.e. username) so I can use that field to query against my database. Error I get in browser: XMLHttpRequest cannot load http://localhost:3000/api/users/test. Request header

问题 I am trying to present a simple user list from an API which returns this: [{"UserID":2,"FirstName":"User2"},{"UserID":1,"FirstName":"User1"}] I do not understand fully how to handle Axios responses with types. The Typescript error is Type '{} | { id: number; firstName: string; }' is not assignable to type 'IntrinsicAttributes & UserListProps & { children?: ReactNode; }'. Property 'items' is missing in type '{}' but required in type 'UserListProps'. from the <UserList /> element in the Users

问题 I am trying to present a simple user list from an API which returns this: [{"UserID":2,"FirstName":"User2"},{"UserID":1,"FirstName":"User1"}] I do not understand fully how to handle Axios responses with types. The Typescript error is Type '{} | { id: number; firstName: string; }' is not assignable to type 'IntrinsicAttributes & UserListProps & { children?: ReactNode; }'. Property 'items' is missing in type '{}' but required in type 'UserListProps'. from the <UserList /> element in the Users

问题 I am trying to present a simple user list from an API which returns this: [{"UserID":2,"FirstName":"User2"},{"UserID":1,"FirstName":"User1"}] I do not understand fully how to handle Axios responses with types. The Typescript error is Type '{} | { id: number; firstName: string; }' is not assignable to type 'IntrinsicAttributes & UserListProps & { children?: ReactNode; }'. Property 'items' is missing in type '{}' but required in type 'UserListProps'. from the <UserList /> element in the Users

问题 I'm trying to map array to get image url from Firebase storage and list them to page. The code give me a url, but the problem is that code not set url to img variable on time and returning empty img variable. return( <div> <Header /> {this.state.loaded ? <Loading /> : null} <div> {this.state.productsArr.map((product, i) => { let img = ''; storageRef.child(`images/${product.images[0]}`) .getDownloadURL() .then((url) => { img = url console.log('then img', img) }) .catch((err) => console.log(err