Develop Reference

Passing Props in SolidJS

I came across something weird while trying to pass props in SolidJS. I've created a store using createStore which I pass through the component tree using Context.Provider. I also have the helper function useStore which lets me access the store anywhere in the component tree (I'm experimenting with React design patterns in SolidJS). I have two components Anime.jsx (parent) and EpisodeList.jsx (child). I'm fetching data when the Anime component mounts and then populate the store with the setter provided by createStore.After which I pass the fetched data to EpisodeList. However, accessing the props of EpisodeList returns an empty proxy (Not sure why, but I think the EpisodeList component isn't re-rendered when store is updated with store.currentAnimeData). I've attached the output below of the console.log statements below.
Any help regarding this would be highly appreciated.
###################################
# Anime.jsx (Parent component)
###################################
const Anime = (props) => {
const [store, setStore] = useStore();
const getAnimeData = async () => {
const currentAnimeId = store.currentAnime.animeId;
const currentAnimeData = await firebase.getAnimeData(currentAnimeId);
setStore(
produce((store) => {
store.currentAnimeData = currentAnimeData;
})
);
};
onMount(() => {
getAnimeData();
});
return (
<>
<div
className={css`
width: 100%;
min-height: 20px;
margin: 8px 0px 5px 0px;
padding: 0px 10px;
box-sizing: border-box;
font-size: 20px;
word-wrap: break-word;
line-height: 1;
`}
>
<span
className={css`
font-size: 20px;
color: #e32451;
`}
>
{"Watching: "}
</span>
{store.currentAnime.name}
</div>
<Search></Search>
<EpisodeList animeData={store.currentAnimeData.episodes} />
</>
);
};
#####################################
# EpisodeList.jsx (child component)
#####################################
const EpisodeList = (props) => {
console.log(props);
console.log(props.animeData);
...... # UI stuff
return (
<div
className={css`
width: 100%;
height: 100%;
box-sizing: border-box;
display: flex;
flex-direction: column;
padding-bottom: 5px;
margin-top: 10px;
`}
>
<ScrollActionUp onmousedown={[scroll, true]} onmouseup={onmouseup}>
➭
</ScrollActionUp>
<div
className={css`
width: 100%;
height: 432px;
box-sizing: border-box;
padding: 10px 10px 0px 10px;
overflow: hidden;
`}
ref={scrollRef}
>
<For each={animeData.episodes}>
{(episode, index) => {
return (
<Episode status={episode.watched} episode={episode}></Episode>
);
}}
</For>
</div>
<ScrollActionDown onmousedown={[scroll, false]} onmouseup={onmouseup}>
➭
</ScrollActionDown>
</div>
);
};
###############
# store.jsx
###############
import { createContext, createSignal, useContext } from "solid-js";
import { createStore } from "solid-js/store";
const StoreContext = createContext();
export function ContextProvider(props) {
const [store, setStore] = createStore({});
return (
<StoreContext.Provider value={[store, setStore]}>
{props.children}
</StoreContext.Provider>
);
}
export function useStore() {
return useContext(StoreContext);
}

My component re-render after i try to search for an element in a useState array

I am currently building a React project, so I made a search Input and when I type something in that Input field my hole component re-renders causing an API recall and deleting the text in my Input. I tried merging both the search component with Home component and the same problem appears.
I want my component to call the api only one time, and I am trying to filter the response depending on the input type.
please help!!
Here is my Home component:
import { useContext, useEffect, useState } from 'react';
import styled from 'styled-components';
import CountryThumb from '../Components/CountryThumb';
import ThemeContext from '../Components/ColorPalette';
import { Themes } from '../Components/ColorPalette';
import Search from '../Components/Search';
import Filter from '../Components/Filter';
const Grid = styled.main`
width: 100%;
display: grid;
grid-template-columns: repeat(4, 1fr);
column-gap: 60px;
row-gap: 40px;
#media (max-width: 375px) {
grid-template-columns: repeat(1, 1fr);
}
`;
export default function Home() {
const [Countries, setCountries] = useState([]);
const [SearchTerms, setSearchTerms] = useState('');
const { Theme } = useContext(ThemeContext);
const style = Theme == 'light' ? Themes.light : Themes.dark;
useEffect(() => {
getCountries();
}, []);
const Main = styled.main`
display: flex;
flex-wrap: wrap;
padding: 20px 100px;
background-color: ${Theme == 'light' ? style.background : style.background};
#media (max-width: 375px) {
padding: 40px 25px;
}
`;
const getCountries = () => {
axios
.get('https://restcountries.eu/rest/v2/all')
.then((res) => setCountries(res.data))
.catch((err) => console.log(err));
};
return (
<>
<Main>
<Search handleSearch={(e) => setSearchTerms(e.target.value)} />
<Filter />
<Grid>
{Countries.slice(0, 12)
.filter((e) => {
if (SearchTerms == '') {
return e;
} else if (
e.name.toLowerCase().includes(SearchTerms.toLowerCase())
) {
return e;
}
})
.map((e) => (
<CountryThumb props={e} />
))}
</Grid>
</Main>
</>
);
}
And here is my Search component:
import { useContext, useState } from 'react';
import styled from 'styled-components';
import ThemeContext, { Themes } from './ColorPalette';
function Search({ handleSearch }) {
const { Theme } = useContext(ThemeContext);
const style = Theme == 'light' ? Themes.light : Themes.dark;
const Svg = styled.svg`
width: 24px;
height: 24px;
color: ${style.text};
`;
const Wrapper = styled.div`
background-color: ${style.element};
border-radius: 5px;
box-shadow: 0 5px 10px ${style.shadow};
display: flex;
align-items: center;
padding: 0 20px;
margin: 40px 0;
`;
const CInput = styled.input`
border: none;
outline: none;
padding: 15px 120px 15px 20px;
font-size: 1rem;
color: ${style.text};
background: none;
`;
return (
<>
<Wrapper>
<Svg
xmlns='http://www.w3.org/2000/svg'
class='h-6 w-6'
fill='none'
viewBox='0 0 24 24'
stroke='currentColor'
>
<path
strokeLinecap='round'
strokeLinejoin='round'
strokeWidth='2'
d='M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z'
/>
</Svg>
<CInput
type='text'
name='Search'
onInput={handleSearch}
placeholder='Search for a country ...'
/>
</Wrapper>
</>
);
}
export default Search;

Whenever you change anything in state your component will rerender so it is normal behaviour. However you have dependency array in useEffect that calls api so this function should run only one time, maybe you didnt have array before and forgot to save.

React child components state is undefined but can see state using console.log

I have a parent component that gets data from an API end point using fetch. This data displays like it should. The parent component passes an element of an array of objects to the child component. In the child component, when I do a console log I can see the state when it's undefined and when the state is set. The issue that I am having is when I try to access a key of the state (i.e. ticket.title) I get an error saying that ticket is undefined. Any help with would be great.
TicketList
import React, { useEffect, useState } from 'react';
import styled from 'styled-components';
import TicketDetails from "./TicketDetails"
export default function TicketList() {
const [tickets, updateTickets] = useState([])
const [ticketIndex, updateticketIndex] = useState("0")
useEffect(() => {
async function fetchTickets() {
const response = await fetch("/api/v1/tickets")
const json = await response.json()
updateTickets(json.data)
}
fetchTickets()
}, [])
return (
<Wrapper>
< div >
<TableTitle>
<h3>Tickets</h3>
<button type="submit">Create A Ticket</button>
</TableTitle>
{
tickets.map((ticket, index) => (
<ListInfo key={ticket._id} onClick={() => updateticketIndex(index)}>
<Left>
<p>{ticket.project}</p>
<p>{ticket.title}</p>
<p>{ticket.description}</p>
</Left>
<Right>
<p>{ticket.ticketType}</p>
<p>{ticket.ticketStatus}</p>
<p>{ticket.ticketPriority}</p>
</Right>
</ListInfo>
))
}
</div>
<TicketDetails key={tickets._id} data={tickets[ticketIndex]} />
</Wrapper>
);
}
const Wrapper = styled.div`
display: flex;
background: white;
grid-area: ticketarea;
height: calc(100vh - 4.25rem);
`
const ListInfo = styled.div`
display: flex;
justify-content: space-between;
width: 100%;
padding: .5rem .75rem;
border-bottom: solid 1px #ccc;
`;
const Left = styled.div`
display: flex;
flex: 2;
flex-direction: column;
p {
padding: .25rem;
}
`;
const Right = styled.div`
display: flex;
flex: 1;
flex-direction: column;
align-items: end;
width: 500px;
p {
padding: .25rem;
}
`;
const TableTitle = styled.div`
display: flex;
justify-content: space-between;
padding: 1rem 1rem;
border-bottom: solid 1px #ccc;
button {
padding: .5rem;
}
`;
TicketDetails
import React, { useEffect, useState } from 'react'
// import TicketInfo from './TicketInfo'
import TicketNotes from "./TicketNotes"
import styled from "styled-components"
export default function TicketDetail(data) {
const [ticket, setTicket] = useState(data)
useEffect(() => {
setTicket(data)
}, [data])
console.log(ticket.data)
return (
<Main>
<TicketInfo key={ticket._id}>
<h2>{ticket.title}</h2>
<Info>
<div>
<InfoItem>
<p>Project</p>
<p>{ticket.project}</p>
</InfoItem>
<InfoItem>
<p>Assigned Dev</p>
<p>{ticket.assignedDev}</p>
</InfoItem>
<InfoItem>
<p>Created By</p>
<p>{ticket.submitter}</p>
</InfoItem>
</div>
<div>
<InfoItem>
<p>Type</p>
<p>{ticket.ticketType}</p>
</InfoItem>
<InfoItem>
<p>Status</p>
<p>{ticket.ticketStatus}</p>
</InfoItem>
<InfoItem>
<p>Priority</p>
<p>{ticket.ticketPriority}</p>
</InfoItem>
</div>
</Info>
<Description>{ticket.description}</Description>
</TicketInfo>
<TicketNotes />
<TicketComment>
<textarea name="" id="" cols="30" rows="10" />
<button type="submit">Submit</button>
</TicketComment>
</Main>
)
}
const TicketInfo = styled.div`
margin: .5rem;
h2{
padding: 0.5rem 0;
}
`;
const Description = styled.p`
padding-top: .5rem;
`;
const Info = styled.div`
display: flex;
justify-content: space-between;
border-bottom: solid 1px #ddd;
`;
const InfoItem = styled.section`
margin: .5rem 0;
p:nth-child(1) {
text-transform: uppercase;
color: #ABB1B6;
font-weight: 500;
padding-bottom: .25rem;
}
`;
const Main = styled.div`
background: white;
`
const TicketComment = styled.div`
display: flex;
flex-direction: column;
width: 40rem;
margin: 0 auto ;
input[type=text] {
height: 5rem;
border: solid 1px black;
}
textarea {
border: solid 1px black;
}
button {
margin-top: .5rem;
padding: .5rem;
width: 6rem;
}
`;

There are a few issues here, let's tackle them in order.
Tickets are undefined
When TicketList is mounted, it fetches tickets. When it renders, it immediately renders TicketDetail. The tickets fetch request won't have finished so tickets is undefined. This is why TicketDetail errors out. The solution is to prevent rendering TicketDetail until the tickets are available. You have a few options.
A bare bones approach is to just prevent rendering until the data is available:
{ !!tickets.length && <TicketDetails key={tickets._id} data={tickets[ticketIndex]} />
This uses how logical operators work in JS. In JS falsey && expression returns falsey, and true && expression returns expression. In this case, we turn ticket.length into a boolean. If it is 0 (i.e. not loaded, therefore false), we return false, which React simply discards. If it is greater than 0 (i.e. loaded, therefore true), we render the component.
This doesn't really result in a positive UX though. Ideally this is solved by showing some kind of Loading spinner or somesuch:
{
!!tickets.length
? <TicketDetails . . . />
: <LoadingSpinner />
}
Child data access
In TicketDetail it seems like you meant to destructure data. Currently you are taking the entire prop object and setting it to ticket. Fixing this should resolve the other half of the issue.
Paradigms
You didn't specifically ask for this, but I’d like to back up and ask why you are putting this prop into state? Typically this only done when performing some kind of ephemeral edit, such as pre-populating a form for editing. In your case it looks like you just want to render the ticket details. This is an anti-pattern, putting it into state just adds more code, it doesn’t help you in any way. The convention in React is to just render props directly, state isn't needed.

ReactJS - pass object keys and values as props to div

In my Class component Field.jsx render(), I'm expanding my <Position> component using <Flipper>, (an abstracted flip animation), like so:
import { Flipper, Flipped } from 'react-flip-toolkit'
import { Position } from "./Position";
import "./css/Position.css";
class Field extends Component {
constructor(props) {
super(props);
this.state = {
fullScreen: false,
};
}
toggleFullScreen() {
this.setState({ fullScreen: !this.state.fullScreen });
}
...
render() {
const { players } = this.props;
const { fullScreen } = this.state;
if(players){
return (
<div className="back">
<div className="field-wrapper" >
<Output output={this.props.strategy} />
<Flipper flipKey={fullScreen}>
<Flipped flipId="player">
<div className="field-row">
{this.getPlayersByPosition(players, 5).map((player,i) => (
<Position
key={i}
className={fullScreen ? "full-screen-player" : "player"}
getPositionData={this.getPositionData}
toggleFullScreen={this.toggleFullScreen.bind(this)}
>{player.name}</Position>
))}
</div>
</Flipped>
</Flipper>
</div>
</div>
);
}else{
return null}
}
When I render it, I get clickable items from the mapped function getPlayersByPosition(), like so:
And if I click on each item, it expands to a div with player name:
Which is passed as props.children at component <div>
Position.jsx
import React from "react";
import "./css/Position.css";
export const Position = props => (
<div
className={props.className}
onClick={() => {
props.getPositionData(props.children);
props.toggleFullScreen();
console.log(props.getPositionData(props.children))
}}
>
{props.children}
</div>
);
getPositionData(), however, returns an object with many items on its turn, as seen by console above:
{matches: 7, mean: 6.15, price: 9.46, value: 0.67, G: 3, …}
QUESTION:
How do I pass and print theses other props keys and values on the expanded purple div as text?, so as to end with:
Patrick de Paula
matches: 7
mean: 6.15
price:9.46
....
NOTE:
Position.css
.position-wrapper {
height: 4em;
display: flex;
justify-content: center;
align-items: center;
font-weight: lighter;
font-size: 1.4em;
color: #888888;
flex: 1;
/*outline: 1px solid #888888;*/
}
.player {
height: 4em;
width: 4em;
display: flex;
justify-content: center;
align-items: center;
text-align: center;
font-weight: lighter;
font-size: 1.4em;
/*background-color: #66CD00;*/
color: #ffffff;
}
.full-screen-player {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
cursor: pointer;
background-image: linear-gradient(
45deg,
rgb(121, 113, 234),
rgb(97, 71, 182)
);
}

Looks like the props are all set & ready to be print as seen on your console. You can access them via props.getPositionData(props.children).property_name_here or destructure them
export const Position = props => {
const { matches, mean, price } = props.getPositionData(props.children);
return (
<div
className={props.className}
onClick={() => {
props.getPositionData(props.children);
props.toggleFullScreen();
console.log(props.getPositionData(props.children))
}}
>
<p>Name: {props.children}</p>
<p>Matches: {matches}</p>
<p>Mean: {mean}</p>
<p>Price: {price}</p>
</div>
)
}
Regarding the issue on the fullScreen prop (see comments section):
Is there a way to print them ONLY after toggleFullScreen()
Since you already have a state on the Field component which holds your fullScreen value, on your Field component, you need to pass the fullScreen prop as well to the Position component. e.g., fullScreen={this.state.fullScreen}. Back on Position component, have some condition statements when you are rendering.
Example:
<>
{props.fullScreen &&
<p>Name: {props.children}</p>
}
</>

How to use StyledComponents theme inside of Component

Below I've created a style called Link. However the theme is inside of this.props. What is the way to get the theme out of props and passed into the Link styled component?
ReferenceError: theme is not defined
import React from 'react';
import styled from 'styled-components';
import { withTheme } from 'styled-components';
export const Link = styled.p`
position: absolute;
z-index: 10;
bottom: 20px;
right: 300px;
width: 100%;
font-size: 1.5rem;
text-align: right;
cursor: pointer;
a {
color: ${theme.apricot}; // <-- error
cursor: pointer;
:hover {
color: ${theme.offWhite}; // <-- error
}
}
`;
class NomicsLink extends React.Component {
render() {
console.log(this.props.theme);
return (<Link>Powered by Nomics APIs.</Link>)
}
}
export default withTheme(NomicsLink);
This console.log prints the following:
{ red: '#FF0000',
black: '#393939',
grey: '#3A3A3A',
lightgrey: '#E1E1E1',
offWhite: '#EDEDED',
apricot: '#FEBE7E',
margin: 0,
padding: 0 }

All styled-components receive theme prop automatically.
You can access them inside the styled component with:
const Link = styled.a`
color: ${props=>props.theme.apricot};
`;
More options on theming, see docs