React Native add Screens dynamically - javascript

I want to add screens dynamically from a changeable array.
This works:
but this doesn't work:
It says: Error: Couldn't find any screens for the navigator. Have you defined any screens as its children?
How can I fix the second to be more "dynamic"?

you can change your components to list of objects.
then loop inside the item by their key and value.
const components = [
{
name: "Home",
element: HomeScreen
},
{
name: "Details",
element: DetailsScreen
}
];
const renderScreen = () => {
let result = null;
if (components) {
result = components.map((item, i) => {
return <Stack.Screen name={item.name} element={item.element} />
});
}
return result;
}
return(
{renderScreen()}
)

change element => { <Stack... /> } to element => { return <Stack... /> } or element => ( <Stack... /> )

Related

My react child callback returns the previous data (navbar)

I am learning React and I have a problem with my childCallback, for return data from child to parent.
I make a navbar and when I click on the navButton, the parent receive the name of the precedent button, I have to click two times for display the good data.
Here is my code :
//PARENT COMPONENT
export const Profil = () => {
const [navActive, setNavActive] = useState("infos");
const handleCallback = (childData, e) => {
setNavActive(childData);
};
// View
return (
<div>
<Navbar callback={handleCallback} />
<Infos />
<Gpg />
{navActive}
</div>
);
};
//CHILD COMPONENT
export const Navbar = ({ callback }) => {
// Nav Items
let nav = [
{ key: 1, name: "infos" },
{ key: 2, name: "gpg" },
{ key: 3, name: "compte" },
{ key: 4, name: "otp" },
{ key: 5, name: "journal" },
];
// State
const [activeTitle, setActiveTitle] = useState(nav[0].name);
// Change the selected nav
function selectNav(e) {
let selected = e.target.innerText;
setActiveTitle(selected);
}
const onTrigger = () => {
callback(activeTitle);
};
// View
return (
<Nav tabs>
{nav.map((item) => (
<NavItem key={item.key} onClick={onTrigger}>
<NavLink
style={{ cursor: "pointer" }}
onClick={selectNav}
active={activeTitle === item.name}
>
{item.name}
</NavLink>
</NavItem>
))}
</Nav>
);
};
I don't know how to correct that.
Try to remove onclick from NavItem and call your callback function from selectNav function directly.
The problem come from the setActiveTitle(selected) in Navbar, with console.log I test and the value is good before this.

How to hide a specific element inside .map function in React?

I am looking for a way to hide a div once the button thats in it is clicked and continue to show all other div's.
I've tried using the setState method, however when setting it to false with onClick() all of my objects disappear.
class App extends React.PureComponent {
state: {
notHidden: false,
}
constructor(props: any) {
super(props);
this.state = {search: '', notHidden: true};
this.hideObject = this.hideObject.bind(this)
}
hideThisDiv() {
this.setState({notHidden: false})
}
async componentDidMount() {
this.setState({
objects: await api.getObjects()
});
}
render = (objects: Object[]) => {
return ({Object.map((object) =>
<div key={index} className='class'>
<button className='hide' type='button' onClick={() => hideThisDiv()}>Hide</button>
<p>object.text</p>
</div>}
render() {
const {objects} = this.state;
return (<main>
<h1>Objects List</h1>
<header>
<input type="search" onChange={(e) => this.onSearch(e.target.value)}/>
</header>
{objects ? this.render(objects) : null}
</main>)
}
);
The data is a data.json file filled with many of these objects in the array
{
"uuid": "dsfgkj24-sfg34-1r134ef"
"text": "Some Text"
}
Edit: Sorry for the badly asked question, I am new to react.
Not tested, just a blueprint... is it what you want to do?
And yes I didn't hide, I removed but again, just an idea on how you can hide button separately, by keeping in state which ones are concerned.
function MagicList() {
const [hidden, hiddenSet] = useState([]);
const items = [{ id:1, text:'hello'}, { id:2, text:'from'}, { id:3, text:'the other sided'}]
const hideMe = id => hiddenSet([...hidden, id]);
return {
items.filter( item => {
return hidden.indexOf(item.id) !== -1;
})
.map( item => (
<button key={item.id} onClick={hideMe.bind(this, item.id)}>{item.text}</button>
))
};
}
Edition
const hideMe = id => hiddenSet([...hidden, id]);
It is just a fancy way to write:
function hideMe(id) {
const newArray = hidden.concat(id);
hiddenSet(newArray);
}
I suggest using a Set, Map, or object, to track the element ids you want hidden upon click of button. This provides O(1) lookups for what needs to be hidden. Be sure to render your actual text and not a string literal, i.e. <p>{object.text}</p> versus <p>object.text</p>.
class MyComponent extends React.PureComponent {
state = {
hidden: {}, // <-- store ids to hide
objects: [],
search: "",
};
// Curried function to take id and return click handler function
hideThisDiv = id => () => {
this.setState(prevState => ({
hidden: {
...prevState.hidden, // <-- copy existing hidden state
[id]: id // <-- add new id
}
}));
}
...
render() {
const { hidden, objects } = this.state;
return (
<main>
...
{objects
.filter((el) => !hidden[el.uuid]) // <-- check id if not hidden
.map(({ uuid, text }) => (
<div key={uuid}>
<button
type="button"
onClick={this.hideThisDiv(uuid)} // <-- attach handler
>
Hide
</button>
<p>{text}</p>
</div>
))}
</main>
);
}
}

Trying to update props in state with method in class component

I'm trying to render a closable tab bar using some Material UI components, and I'm having trouble implementing the onDelete method for when the user wants to close a tab. I'm passing the data set, an array of objects, as a prop called dataSet. I want to update it whenever the user closes a tab but it doesn't re-render; all tabs still appear. When I console.log this.state.dataSet on each click however, I see that the tabs are getting deleted. What am I doing wrong?
class ClosableTabs extends Component {
state = {
tabIndex: 0,
dataSet: this.props.dataSet,
};
onDelete = id => {
this.setState(prevState => {
const updatedDataSet = prevState.dataSet.filter(tab => tab.id !== id);
return {
dataSet: updatedDataSet,
};
}, console.log(this.state.dataSet);
};
renderTabs = dataSet => {
return dataSet.map(data => {
return (
<Tab
key={data.id}
label={
<span>
{data.title}
</span>
<Button
icon="close"
onClick={() => this.onDelete(data.id)}
/>
}
/>
);
});
};
render() {
const { value, dataSet, ...rest } = this.props;
return (
<TabBar value={this.state.tabIndex} onChange={this.onChange} {...rest}>
{this.renderTabs(dataSet)}
</TabBar>
);
}
}
export default Tabs;
and here is my data set that I pass as props when I use <ClosableTabs />
const dataSet = [
{
id: 1,
title: 'title 1',
},
{
id: 2,
title: 'title 2',
},
{
id: 3,
title: 'title 3',
},
];
When you render dataSet, you use the array you get from props (which never changes):
render() {
const { value, dataSet, ...rest } = this.props; // dataSet comes from props
return (
<TabBar value={this.state.tabIndex} onChange={this.onChange} {...rest}>
{this.renderTabs(dataSet)} // renderTabs renders this.props.dataSet
</TabBar>
);
}
}
instead, render dataSet which comes from your state (you should use different naming for this.props.dataSet and this.state.dataSet to avoid this kind of mistakes):
render() {
const { value, ...rest } = this.props;
const { dataSet } = this.state; // dataSet now comes from state
return (
<TabBar value={this.state.tabIndex} onChange={this.onChange} {...rest}>
{this.renderTabs(dataSet)} // renderTabs renders this.state.dataSet
</TabBar>
);
}
}
The problem is you are rendering the component with props instead of state.
Your render function should look likes this:
render() {
const { value, dataSet, ...rest } = this.props;
return (
<TabBar value={this.state.tabIndex} onChange={this.onChange} {...rest}>
{this.renderTabs(this.state.dataSet)}
</TabBar>
);
}
}

Filtering an Array within an Array in React

import React, { Component } from "react"
import {
StaticQuery,
grahpql,
Link
} from "gatsby"
import {
StyledFilter,
StyledLine
} from "./styled"
class Filter extends Component {
render() {
const { data } = this.props
const categories = data.allPrismicProjectCategory.edges.map((cat, index) => {
return (
<a
key={index}
onClick={() => this.props.setFilterValue(cat.node.uid)}
>
{cat.node.data.category.text}
</a>
)
})
return (
<StyledFilter>
<div>
Filter by<StyledLine />
<a
// onClick={() => {this.props.filterProjects("all")}}
>
All
</a>
{categories}
</div>
<a onClick={this.props.changeGridStyle}>{this.props.gridStyleText}</a>
</StyledFilter>
)
}
}
export default props => (
<StaticQuery
query={graphql`
query {
allPrismicProjectCategory {
edges {
node {
uid
data {
category {
text
}
}
}
}
}
}
`}
render={data => <Filter data={data} {...props} />}
/>
)
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
I am working on a React App with Gatsby and Prismic that has a project page. By default it lists all projects but at the page's top appears a filter to select by category (just a bunch of <a> tags).
My Page consists of a <Filter /> component as well as several <GridItem /> components I am mapping over and load some props from the CMS.
The part I am struggling with is the filtering by category.
When my page component mounts it adds all projects into my filteredItems state.
When a user is clicking on a filter at the top it set's my default filterValue state from "all" to the according value.
After that I'll first need to map over the array of projects and within that array I'll need to map over the categories (each project can belong to multiple categories).
My idea is basically if a value (the uid) matches my new this.state.filterValue it returns the object and add's it to my filteredItems state (and of course delete the one's not matching this criteria).
This is what my page component looks like (cleaned up for better readability, full code in the snippet at the bottom):
class WorkPage extends Component {
constructor(props) {
super(props)
this.state = {
filterValue: "all",
filteredItems: []
}
this.filterProjects = this.filterProjects.bind(this)
}
filterProjects = (filterValue) => {
this.setState({ filterValue: filterValue }, () =>
console.log(this.state.filterValue)
)
// see a few of my approaches below
}
componentDidMount() {
this.setState({
filteredItems: this.props.data.prismicWork.data.projects
})
}
render() {
const projectItems = this.props.data.prismicWork.data.projects && this.props.data.prismicWork.data.projects.map((node, index) => {
const item = node.project_item.document["0"].data
const categories = node.project_item.document["0"].data.categories.map(cat => {
return cat.category_tag.document["0"].uid
})
return (
<GridItem
key={index}
categories={categories}
moreContentProps={moreContentProps}
/>
)
})
return (
<LayoutDefault>
<Filter
filterProjects={this.filterProjects}
/>
{projectItems}
</LayoutDefault>
)
}
}
I tried so many things, I can't list all of them, but here are some examples:
This approach always returns an array of 10 objects (I have 10 projects), sometimes the one's that don't match the this.state.filterValue are empty objects, sometimes they still return their whole data.
let result = this.state.filteredItems.map(item => {
return item.project_item.document["0"].data.categories.filter(cat => cat.category_tag.document["0"].uid === this.state.filterValue)
})
console.log(result)
After that I tried to filter directly on the parent item (if that makes sense) and make use of indexOf, but this always console logged an empty array...
let result = this.state.filteredItems.filter(item => {
return (item.project_item.document["0"].data.categories.indexOf(this.state.filterValue) >= 0)
})
console.log(result)
Another approach was this (naive) way to map over first the projects and then the categories to find a matching value. This returns an array of undefined objects.
let result = this.state.filteredItems.map(item => {
item = item.project_item.document["0"].data.categories.map(attachedCat => {
if (attachedCat.category_tag.document["0"].uid === this.state.filterValue) {
console.log(item)
}
})
})
console.log(result)
Other than that I am not even sure if my approach (having a filteredItems state that updates based on if a filter matches the according category) is a good or "right" React way.
Pretty stuck to be honest, any hints or help really appreciated.
import React, { Component } from "react"
import { graphql } from "gatsby"
import LayoutDefault from "../layouts/default"
import { ThemeProvider } from "styled-components"
import Hero from "../components/hero/index"
import GridWork from "../components/grid-work/index"
import GridItem from "../components/grid-item/index"
import Filter from "../components/filter/index"
class WorkPage extends Component {
constructor(props) {
super(props)
this.state = {
filterValue: "all",
filteredItems: [],
isOnWorkPage: true,
showAsEqualGrid: false
}
this.filterProjects = this.filterProjects.bind(this)
this.changeGridStyle = this.changeGridStyle.bind(this)
}
changeGridStyle = (showAsEqualGrid) => {
this.setState(prevState => ({
showAsEqualGrid: !prevState.showAsEqualGrid,
isOnWorkPage: !prevState.isOnWorkPage
}))
}
filterProjects = (filterValue) => {
this.setState({ filterValue: filterValue }, () =>
console.log(this.state.filterValue)
)
let result = this.state.filteredItems.filter(item => {
return (item.project_item.document["0"].data.categories.toString().indexOf(this.state.filterValue) >= 0)
})
console.log(result)
}
componentDidMount() {
this.setState({
filteredItems: this.props.data.prismicWork.data.projects
})
}
render() {
const projectItems = this.props.data.prismicWork.data.projects && this.props.data.prismicWork.data.projects.map((node, index) => {
const item = node.project_item.document["0"].data
const categories = node.project_item.document["0"].data.categories.map(cat => {
return cat.category_tag.document["0"].uid
})
return (
<GridItem
key={index}
isSelected="false"
isOnWorkPage={this.state.isOnWorkPage}
isEqualGrid={this.state.showAsEqualGrid}
projectURL={`/work/${node.project_item.uid}`}
client={item.client.text}
tagline={item.teaser_tagline.text}
categories={categories}
imageURL={item.teaser_image.squarelarge.url}
imageAlt={item.teaser_image.alt}
/>
)
})
return (
<ThemeProvider theme={{ mode: "light" }}>
<LayoutDefault>
<Hero
introline="Projects"
headline="Art direction results in strong brand narratives and compelling content."
/>
{/* {filteredResult} */}
<Filter
filterProjects={this.filterProjects}
changeGridStyle={this.changeGridStyle}
gridStyleText={this.state.showAsEqualGrid ? "Show Flow" : "Show Grid"}
/>
<GridWork>
{projectItems}
</GridWork>
</LayoutDefault>
</ThemeProvider>
)
}
}
export default WorkPage
export const workQuery = graphql`
query Work {
prismicWork {
data {
page_title {
text
}
# All linked projects
projects {
project_item {
uid
# Linked Content
document {
type
data {
client {
text
}
teaser_tagline {
text
}
teaser_image {
url
alt
xlarge {
url
}
large {
url
}
medium {
url
}
squarelarge {
url
}
squaremedium {
url
}
squaresmall {
url
}
}
categories {
category_tag {
document {
uid
data {
category {
text
}
}
}
}
}
}
}
}
}
}
}
}
`
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
So there are at least two things.
In your filterProjects() you're first setting state.filterValue and then you use it in filteredItems.filter(). That might not work, because React does not execute setState() immediately always, to optimize performance. So you're probably filtering against the previous value of state.filterValue. Instead just use filterValue, which you pass into filterProjects().
setFilterValue = (filterValue) => {
this.setState({filterValue}) // if key and variable are named identically, you can just pass it into setState like that
}
// arrow function without curly braces returns without return statement
filterProjects = (projects, filterValue) =>
projects.filter(item => item.project_item.document[0].data.categories.toString().includes(filterValue))
You should return the result from filterProjects(), because you need to render based on the filteredItems then, of course. But actually it's not necessary to put the filter result into state. You can apply the filterProjects() on the props directly, right within the render(). That's why you should return them. Also separate setState into another function which you can pass into your <Filter/> component.
And a recommendation: Use destructuring to make your code more readable. For you and anyone else working with it.
render() {
const { projects } = this.props.data.prismicWork.data // this is
const { filterValue } = this.state // destructuring
if (projects != undefined) {
this.filterProjects(projects, filterValue).map((node, index) => {
// ...
// Filter component
<Filter filterProjects={this.setFilterValue} />
That way you trigger a rerender by setting the filterValue, because it
resides in this.state, and the render function depends on
this.state.filterValue.
Please try that out and tell me if there is another problem.

How do I pass children index number to a react component?

My Data looks like the below.
const data = {
main: {
88: {
issues: [
{
id: 1
},
{
id: 3
},
{
id: 4
}
]
}
}
};
I am looping through data.main and then passing some data to the child component like this.
{Object.values(data.main).map((key) => {
<Issues
id={key}
issueIndex={XXX}
{...this.props}
/>
}
But I also want to pass an index of all issues to the child element. So that I can number it from here.
My attemp inside jsx file below.
{Object.values(data.main).map((group, key) => {
let issuesArr = group.issues;
{issuesArr.map((value, index) => { index + 1; })}
<Issue
id={key}
issueIndex={XXX}
{...this.props}
/>
}
I want to pass a number as issueIndex to the <Issue /> I have no control of the data structure.
That is happening because your issuesArr.map isn't doing anything. Change your code to this:
{
Object.values(data.main).map((group, key) => {
let issuesArr = group.issues;
{
issuesArr.map((value, index) => {
return (
<Issue
id={key}
issueIndex={value.id}
{...this.props}
/>
)
}
}
}

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