Hey I use bootstrap with React and I try figure out, how I can extend my component by passing className props deeper. In my atom component I have two files. First one with component declaration.
Breadcrumb.js
export const Breadcrumb = (props) => {
const { className } = props;
const classes = getClasses(className);
return (
<Link to={props.path} className={classes} {...props}>
{props.children}
</Link>
);
};
and another one with getClasses() which returns all default BS classes.
Breadcrumb.style.js
export const getClasses = (extra = "") => {
const defaultClasses = getDefaultClasses();
const addingClasses = extra;
const classes = `${defaultClasses} ${addingClasses}`;
return classes;
};
const getDefaultClasses = () => `ps-3 fs-3 fw-bold text-decoration-none`;
What I want to achieve is, when I'll invoke my Breadcrumb component, and I'll decied to extend it on extra classes I can do that by pass className props...like
TopBar.js
export const TopBar = () => {
const breadcrumbs = useBreadcrumbs(routes, { disableDefaults: true });
const classes = getClasses();
return (
<div className={classes}>
{breadcrumbs.map(({ match, breadcrumb }) => (
<Breadcrumb
path={match.pathname}
children={breadcrumb}
className="cs_breadcrumb"
key={uuidv4()}
/>
))}
</div>
);
};
But when I do that, my declare Breadcrumb className is override by invoke Breadcrumb className... Although in Breadcrumb.js console.log(classes) returns concated classes.
Anyone knows how to achieve that or has any tips ?? I'll be glad
Change
export const Breadcrumb = (props) => {
const { className } = props;
const classes = getClasses(className);
return (
<Link to={props.path} className={classes} {...props}>
{props.children}
</Link>
);
};
to
export const Breadcrumb = ({ className, ...rest }) => {
const classes = getClasses(className);
return (
<Link to={props.path} className={classes} {...rest}>
{props.children}
</Link>
);
};
So, you need to extract the className prop in the place where props was, and also add ...rest for the rest props.
I guess you want to extend component classes with other classes passed via props.
If I understand correctly, you can try like this:
export const Breadcrumb = (props) => {
const { className } = props;
const classes = getClasses(className);
return (
<Link to={props.path} className={[classes, className].join(" ")]}
{...props}>
{props.children}
</Link>
);
};
Related
I have the following code `
import { useState, useEffect } from 'react'
import LayoutContent from './layout_content';
type Props = {
children: JSX.Element | JSX.Element[]
}
const Layout = ({ children }: Props) => {
const [selected, setSelected] = useState(countries[0]);
const country= selected.id
return (
<>
<Sidebar onClick={toggle} sidebar={open} />
<LayoutContent sidebar={open} countriesWithsrc ={countriesWithsrc} selected={selected} lected={setSelected} >
{children}
</LayoutContent>
</>
)
}
export default Layout;
`
How do I pass the variable country from the Layout component to the children without state management ?.I.e I want to drill it.
If you don't want any state management you can use React.Children. It provides utilities to work with the children prop. React.Children.map will run a method for every immediate child of the component. You can use cloneElement along with that to create a clone of your element by passing in extra properties. Infact you can even modify the children of an element you are cloning, but that is not the ask here.
Do note that context would be the better way to do it.
const Layout = ({ children }: Props) => {
....
....
const modifiedChildren = React.Children.map(children, child => {
if (React.isValidElement(child)) {
return React.cloneElement(child, { testProp : 'test' });
}
return child;
});
....
....
return (
<>
<Sidebar onClick={toggle} sidebar={open} />
<LayoutContent sidebar={open} countriesWithsrc ={countriesWithsrc} selected={selected} lected={setSelected} >
{modifiedChildren}
</LayoutContent>
</>
)
}
Is it possible to pass other components through a state? I'm trying to make a tab function like a web browser, and if the user clicks the tab, a component shows up.
In my app.js I have -
const[chosenTab, setChosenTab] = useState("")
return (
<>
<Main chosenTab = {chosenTab}/>
</>
);
In Main.js -
const Main = ({chosenTab}) => {
return (
<>
{chosenTab}
</>
)
}
With the code below, the logic works to display the name of the tab/other component, but doesn't work if I replace {chosenTab} with <{chosenTab}/> to pass it as a component rather than just html.
I don't think this would work as you've structured it - I'd be welcome to have someone prove me wrong though since that would be a neat trick.
Now if I had to solve this problem, I'd simply use a object to hold what I need:
const tabMap = {
"string1": <component1 />,
"string2": <component2 />,
"string3": <component3 />
}
const Main = ({chosenTab}) => {
return (
<>
{tabMap[chosenTab]}
</>
)
}
Even further, let's say you wanted to pass in custom props, you could make tabMap a function to do that.
You can pass component reference itself as a tab.
const TabA = () => <div>Tab A</div>
const TabB = () => <div>Tab B</div>
const Main = ({ ChosenTab }) => {
retur <ChosenTab />
}
const App = () => {
const [chosenTab, setChosenTab] = useState(() => TabA);
const changeTab = (tab) => setChosenTab(() => tab);
return <Main ChosenTab={chosenTab} />
}
export default App;
Or you can store your tabs in object, Map or Array and set state accordingly
const tabs = {
A: TabA,
B: TabB
}
const App = () => {
const [chosenTab, setChosenTab] = useState(() => tabs.A);
const changeTab = (tabKey) => setChosenTab(() => tabs[tabKey]);
return <Main ChosenTab={chosenTab} />
}
export default App;
I have one common component for Success and rendering this component through navigating routes.
SuccessComponent.jsx
var pageTitle;
const SuccessComponent = (props) => {
pageTitle = props.location.state.title;
return(
<> jsx code here </>
)
}
//This title needs to be dynamic, not getting props here hence took var pageTitle but getting undefined.
let SuccessComp = withTitle({component: SuccessComponent, title: pageTitle})
export default SuccessComp;
WithTitle component is setting title through react-helmet library and updating on each screen.
I need to change title on different calls of SuccessComponent. How can I achieve this?
I'm using SuccessComponent as below.
MyComponent.jsx
export default MyComponent = () => {
const onSubmit = () => {
props.history.push({pathname:'/success',state:{title: 'my comp'})
}
return(
<> jsx code here </>
)
}
MyComponent1.jsx
export default MyComponent1 = () => {
const onSubmit = () => {
props.history.push({pathname:'/success',state:{title: 'my comp 1'})
}
return(
<> jsx code here </>
)
}
withTitle.jsx
export default function withTitle({component: Component, title}){
return function title(props){
(
<>
<Helmet>
<title>{title}</title>
</Helmet>
<Component {...props} />
</>
)
}
}
You are sending the state through the react-router but you try to access local props. You need to access the title in this.props.location.state.title
If you have a look at this answer it will help you get the right conslusion. How to pass params with history.push/Link/Redirect in react-router v4?
withTitle.jsx
export default function withTitle({component: Component, title}){
const [titleState, setTitleState] = useState();
return function title(props){
(
<>
<Helmet>
<title>{title}</title>
</Helmet>
<Component {...props} setTitle={setTitleState}/>
</>
)
}
}
Added one method call and called it from Success Component as below.
SuccessComponent
const SuccessComponent = (props) => {
props.setTitle(props.location.state.pageTitle);
return(
<> jsx code here </>
)
}
//This title needs to be dynamic, not getting props here hence took var pageTitle but getting undefined.
let SuccessComp = withTitle({component: SuccessComponent })
export default SuccessComp;
I faced with some problem. I have heavy JSX Element with multipe states. In another part of app I need to pass this Element to Modal window with keeping all states. What is the best solution for solving this problem? Of course I can make Parent with all states and pass it to Child. But maybe it's possible to freeze all states and pass JSX Element as independent component?
Structure will look like:
ParentElement
|_
AnotherElement
|_
SomeHeavyElement
ParentElement:
const ParentElement= () => {
return (
<React.Fragment>
<AnotherElement />
<SomeHeavyElement />
</React.Fragment>
);
};
export default ParentElement;
AnotherElement:
const AnotherElement= () => {
return (
<React.Fragment>
<dialog>
<SomeHeavyElement/>
</dialog>
</React.Fragment>
);
};
export default AnotherElement;
SomeHeavyElement
const SomeHeavyElement= () => {
const [state1, setState1] = useState(true);
...
const [state99, setState99] = useState(false);
return (
<React.Fragment>
{/*some logic*/}
</React.Fragment>
);
};
export default SomeHeavyElement;
You have to lift state up, meaning you should define your state on top of both component (in <ParentElement>). You can't really freeze your component internal state.
Here is a minimal example:
const ParentElement= () => {
const [state1, setState1] = useState(true);
// ...
const [state99, setState99] = useState(false);
return (
<React.Fragment>
<AnotherElement state={{state1, state99}} />
<SomeHeavyElement state={{state1, state99}} />
</React.Fragment>
);
};
export default ParentElement;
const SomeHeavyElement= ({state}) => {
return (
<React.Fragment>
{/*some logic*/}
</React.Fragment>
);
};
export default SomeHeavyElement;
const AnotherElement= ({state}) => {
return (
<React.Fragment>
<dialog>
<SomeHeavyElement state={state} />
</dialog>
</React.Fragment>
);
};
export default AnotherElement;
Also, when you have a lot of useState defined, you could useReducer to centralize your component state. Also, if you want to avoid props drilling, you could define handle your state using React API context.
Official ReactJs documentation recommends to create components following the dot notation like the React-bootstrap library:
<Card>
<Card.Body>
<Card.Title>Card Title</Card.Title>
<Card.Text>
Some quick example text to build on the card title and make up the bulk of
the card's content.
</Card.Text>
</Card.Body>
</Card>
It is very easy to create this structure with the help of a class component:
const CardBody = ({ children }) => <div className='body'>{children}</div>;
class Card extends Component {
static Body = CardBody;
render() {
return (
<div className='card'>{this.props.children}</div>
);
}
}
But it's also recommended to use as much as possible functional component. Unfortunately I don't know how to achieve this using only functional component.
If I follow this way, I'm no more able to use Card as a component because he is now an object of components:
const Card = {
Component: CardComponent,
Body: CardBody
}
export default Card
I'd have to use it that way, and it's not really what I want:
<Card.Component>
<Card.Body>
...
Do you have any idea how to do that?
In function component you can do like so:
// Card.react.js
const Card = ({ children }) => <>{children}</>;
const Body = () => <>Body</>;
Card.Body = Body;
export default Card;
// Usage
import Card from "./Card.react.js";
const App = () => (
<Card>
<Card.Body />
</Card>
);
Or, you can exploit named exports:
// Card.react.js
export const Wrapper = ({ children }) => <>{children}</>;
export const Body = () => <>Body</>;
// Usage
import * as Card from "./Card.react.js";
const App = () => (
<Card.Wrapper>
<Card.Body />
</Card.Wrapper>
);
For functional components
const CardBody = ({ children }) => <div className='body'>{children}</div>;
const Card = (props) => (
<div className='card'>{props.children}</div>
);
Card.Body = CardBody
And then use it like
<Card>
<Card.Body>
....