how to use import statement to import functions from one component to other component.
Below is how the import statement is:
import Tool from '../Common';
import { ToolContextProvider } from '../Common';
This complaint of duplicate lines. So I have tried something like below,
import { ToolContextProvider, Tool} from '../Common';
But this doesn't seem to be correct. How can write this in one line.
Could someone help me with this? Thanks.
basically there are two different type of export in javascript modules (also react included):
default export
named export
default export would be like :
// someFile.js
export default SomeComponent
named export would be like
// someFile.js
export SomeOtherComponent
importing them in other components for using them should be like:
// useCase.js
import SomeComponent from './someFile' // for default export
import { SomeOtherComponent } from './someFile' // for named export
import SomeComponent, { SomeOtherComponent } from './someFile' // for using both
You can import like this. Just combine both of them.
import Tool, { ToolContextProvider } from '../Common';
Related
i have following file structure
.components
.coma
app.js
i have tried
import myname form "./app.js"
and also
import myname form ".//app.js" in compa
Check out this codesandbox link
There are two ways that you can export a function, component, etc:
Default exports:
To export:
export default function Component() {
return <div></div>;
}
To import
import Component from './Component';
Named exports:
To export:
export function Component() {
return <div>Component</div>;
}
To import
import { Component } from './Component';
See this link for more information about exporting components in React
EDIT:
You can declare your components and functions and export them in another line.
I'm working on a React app and came to this case.
Input:
The folder structure:
/ProductTypeSelection
index.tsx
ProductTypeSelectionView.tsx
ProductTypeSelectionView.tsx:
const ProductTypeSelectionView: React.FunctionComponent<ProductTypeSelectionViewProps> = () => {
return <div />;
};
export default ProductTypeSelectionView;
index.tsx:
export { default } from './ProductTypeSelectionView'
Desired output
Right now I could import that ProductTypeSelection component like this: import ProductTypeSelection from 'src/ProductTypeSelection' but the VSCode does not suggest auto-import for ProductTypeSelection (just ProductTypeSelectionView).
So my desired output would be able to use that import syntax and get the ProductTypeSelection import suggestion from VSCode at the same time. I wonder if this is achievable, thank you very much.
Tried
This will work as expected but wondering if I could re-write this in 1 line.
import ProductTypeSelection from "./ProductTypeSelectionView";
export default ProductTypeSelection;
You export a default, instead try:
export { default as ProductTypeSelectionView } from './ProductTypeSelectionView'
I usually export the components by this way:
export {Login} ;
Then import them in index.js file by this way:
export * from './login';
Then import them in each screen i want by this way :
import {Login, Header, Footer} from './index.js'
Now i am using redux in my project and i should use connect when i export my components by this way:
export default connect(mapStateToProps, {emailChanged})({Login});
But i am getting following error
How should i export Logincomponent ? ( Please keep in your mind i need to use index.js file to export my components, then i can not export them separately)
If u want specific name for the Component. you can create const and pass it in export.
const LoginComponent = connect(mapStateToProps, {emailChanged})({Login});
export { LoginComponent };
I am receiving the following error when trying to run my React app:
./src/components/App/App.js
Attempted import error: 'combineReducers'
is not exported from '../../store/reducers/'.
Here's how I'm exporting combineReducers:
import { combineReducers } from 'redux';
import userReducers from './userReducers';
import articleReducers from './articleReducers';
export default combineReducers({
userReducers,
articleReducers
});
and here's how I'm importing it in App.js:
import { combineReducers } from '../../store/reducers';
What's incorrect in how I'm exporting combineReducers?
import { combineReducers } from '../../store/reducers';
should be
import combineReducers from '../../store/reducers';
since it's a default export, and not a named export.
There's a good breakdown of the differences between the two here.
i had the same issue, but I just typed export on top and erased the default one on the bottom. Scroll down and check the comments.
import React, { Component } from "react";
export class Counter extends Component { // type this
export default Counter; // this is eliminated
I guess I am coming late, but this info might be useful to anyone I found out something, which might be simple but important.
if you use export on a function directly i.e
export const addPost = (id) =>{
...
}
Note while importing you need to wrap it in curly braces
i.e. import {addPost} from '../URL';
But when using export default i.e
const addPost = (id) =>{
...
}
export default addPost,
Then you can import without curly braces i.e.
import addPost from '../url';
export default addPost
I hope this helps anyone who got confused as me. 🙂
This is another option:
export default function Counter() {
}
Take into consideration that if you are using a named export you don't need curly brackets:
export const Component
->
import {ComponentName}
Only the default exported component be imported with curly brackets:
export default
->
import ComponentName
Maybe i'm late too but i had a similar problem with folders inside of component folder. i changed the folder's name with Capital letter. it worked for me.
If changing the import doesn't help maybe you just need to run yarn install or npm install (or whatever you're using) and restart your server. Worked for me.
Be sure to Capitalize the name of the constant variable you're exporting inside the component. When you Import the component elsewhere you should also check that its first letter is capitalized since this is one of the ways React uses to identify its components.
inside component:
import React from 'react';
export const Component = (props) => (...)
And then, when importing:
import {Component} from '../location/file'
Consider checking for any file renamings that git hasn't been instructed to track with git mv
I want to do this
in src/modules/layout/nav.js
...
export default NavBar;
in src/modules/layout/side.js
...
export default sideBar;
in src/modules/layout/index.js
import NavBar from './nav';
import sideBar from './side';
export { NavBar, sideBar };
in src/modules/index.js
import * from './layout';
The last bit does not work. According to the tutorial I would then be able to go to src/App.js and use the navBar as so:
import {navBar} from './modules';
But the fact that * does not work I can't do that. Is there any alternative without having to go like this
in src/modules/index.js
import * as All from './layout';
export All;
Then in App.js, go All.navBar. That feels ugly
Well, I have gone through what you have; I feel what you actually needed is to understand the reason for doing that. I am pretty sure what you want to achieve is to have your components imported from a single file rather than from the files where the components were exported.
You don't want to do this:
import NavBar from 'src/modules/layout/NavBar';
import SideBar from 'src/modules/layout/SideBar';
But what you want is to import all your components from a single file wherever you would want to use them.
So, if that is the case, you don't need to add more complexities. All you just need to do is:
// export the components like this
export default NavBar;
export default SideBar;
// Then, in your src/modules/layout/index.js file, import // the components you exported just the way you did it
import NavBar from './NavBar';
import SideBar from './SideBar';
export {
NavBar,
SideBar
}
// Hence, wherever you need both components, you can easily do this:
import { NavBar, SideBar } from '../index.js'
// From the above, you are just importing both components from the index.js file.
So, I believe that answers your question.
Just to add to Onyekachi Samuel's answer and to answer the all part of the title:
After creating the src/modules/layout/index.js file as he described, you can import all by:
import * as All from './layout'
And use the exported components:
<All.NavBar/> <All.SideBar/>
For instance:
// Folder structure:
// |-App.js
// |-Layout
// |-NavBar.js
// |-SideBar.js
// |-index.js
// App.js in the same location as Layout folder
import React from 'react';
import * as All from './layout'
export default function App(props) {
return (<div>
<All.NavBar/>
<All.SideBar/>
</div>)
}
Hope this might clarify it for some.