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How can I use className in component from styled-components in React?

NavStyles.js
import styled from 'styled-components';
export const Nav = styled.navwidth: 100%; ;
export const NavMenuMobile = styled.ul`
height: 80px;
.navbar_list_class {
font-size: 2rem;
background-color: red;
}
${props => props.navbar_list_props && `
font-size: 2rem;
background-color: gray;
`}
`;
Navbar.js
import React from 'react'
import {Nav, NavMenuMobile} from "./NavStyles";
const Navbar = () => {
return (
<Nav>
{/* work no problem */}
<NavMenuMobile navbar_list_props>Nav Bar props</NavMenuMobile>
{/* not work How to use..? */}
<NavMenuMobile className="navbar_list_class">Nav Bar class</NavMenuMobile>
</Nav>
)
}
export default Navbar

<Nav>
<NavMenuMobile className={navbar_list_props}>Nav Bar props</NavMenuMobile>
</Nav>
Try This

Looks like you are setting styles for the children within NavMenuMobile with the class "navbar_list_class".
Should work with &.navbar_list_class
export const NavMenuMobile = styled.ul`
height: 80px;
&.navbar_list_class {
font-size: 2rem;
background-color: red;
}
`;

Why I can't pass simple props in React..From parent to child

I am a beginner of React.
I'm practicing using React to pass props from parent to child.
but.I can't pass props.
I just want to pass simple props from parent to child.
My code is here.
https://codesandbox.io/s/props-test-3bgjy?file=/src/Child.js
My code is not showing the error.
But my code doesn't display correctly.
import React, { Component } from "react";
import styled from "styled-components";
import Child from "./Child";
const Button = styled.button`
font-size: 16px;
padding: 16px;
`;
class App extends Component {
constructor(props) {
super(props);
this.state = {
counter: 0,
msg: "state(msg)initial",
flg: true
};
this.doAction = this.doAction.bind(this);
}
doAction() {
this.setState((state) => ({
counter: state.counter + 1,
msg: state.counter,
flg: !state.flg
}));
}
render() {
return (
<div>
<Child msg={this.state.message} flag={this.state.flag} />
<Button onClick={this.doAction}>Click</Button>
</div>
);
}
}
export default App;
import React, { Component } from "react";
import styled from "styled-components";
const Message = styled.p`
font-size: 24pt;
color: #900;
margin: 20px 0px;
padding: 5px;
border-bottom: 2px solid #900;
&[data-primary="true"] {
font-size: 24pt;
color: white;
background-color: #900;
margin: 20px 0px;
padding: 5px;
border-bottom: 2px solid #900;
}
`;
class Child extends Component {
render() {
return (
<div>
<Message data-primary={this.props.flag}>
count: {this.props.msg}
</Message>
</div>
);
}
}
export default Child;

You are have mistake in line <Child msg={this.state.message} flag={this.state.flag} />
Need use state param msg
<Child msg={this.state.msg} flag={this.state.flag} />
https://codesandbox.io/s/props-test-forked-gw69r?file=/src/Parent.js

It looks like you have a typo; change this line:
<Child msg={this.state.message} flag={this.state.flag} />
to
<Child msg={this.state.msg} flag={this.state.flg} />

Expand div in a Class component

I'm following this react-flip-toolkit tutorial in order to animate a<div> expansion in a component:
This is the tutorial code:
import React, { useState } from 'react'
import { Flipper, Flipped } from 'react-flip-toolkit'
const AnimatedSquare = () => {
const [fullScreen, setFullScreen] = useState(false)
const toggleFullScreen = () => setFullScreen(prevState => !prevState)
return (
<Flipper flipKey={fullScreen}>
<Flipped flipId="square">
<div
className={fullScreen ? 'full-screen-square' : 'square'}
onClick={toggleFullScreen}
/>
</Flipped>
</Flipper>
)
}
My project however, unlike the functional Component example above, uses Class components, like so:
class Field extends Component {
constructor(props) {
super(props);
this.state = {
players:[],
};
}
getPlayersByPosition = (players, position) => {
return players.filter((player) => player.position === position);
};
render() {
const { players } = this.props;
if(players){
return (
<div className="back">
<div className="field-wrapper" >
<Output output={this.props.strategy} />
// this is the target div I want to expand
<div className="row">
{this.getPlayersByPosition(players, 5).map((player,i) => (
<Position key={i} >{player.name}</Position>
))}
</div>
</div>
</div>
);
}else{
return null}
}
}
export default Field;
How can I declare AnimatedSquare() in my Class component and encapsulate my target <div> above within <Flipper/> and <Flipped/>?

I've converted the example to a class based component for you. You should be able to work the rest out from this example:
import React, { Component } from "react";
import ReactDOM from "react-dom";
import { Flipped, Flipper } from "react-flip-toolkit";
import "./styles.css";
class AnimatedSquare extends Component {
state = {
fullScreen: false
};
toggleFullScreen() {
this.setState({ fullScreen: !this.state.fullScreen });
}
render() {
const { fullScreen } = this.state;
return (
<Flipper flipKey={fullScreen}>
<Flipped flipId="square">
<div
className={fullScreen ? "full-screen-square" : "square"}
onClick={this.toggleFullScreen.bind(this)}
/>
</Flipped>
</Flipper>
);
}
}
ReactDOM.render(<AnimatedSquare />, document.querySelector("#root"));
* {
box-sizing: border-box;
}
body {
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
}
.square {
width: 5rem;
height: 5rem;
cursor: pointer;
background-image: linear-gradient(
45deg,
rgb(121, 113, 234),
rgb(97, 71, 182)
);
}
.full-screen-square {
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)
);
}

Create React List with Remove Button on Hover

I'm creating a DropDown List box and each item in the list has a remove (X) button to remove the item from the list. How is it possible to show the remove button "only" when the item is hovered over?
The current code shows the clear button each each item but I only want it to show when the item is hovered over
Sorry, here is the code
import React from 'react';
import PropTypes from 'prop-types';
import styled from 'styled-components';
const ListWrapper = styled.div`
position: absolute;
width: 16rem;
z-index: 1;
background: white;
&:hover {
cursor: pointer;
}
`;
const ListMenu = styled.div`
position: absolute;
width: 100%;
z-index: 1;
background: white;
overflow-x: hidden;
`;
const ListMenuHeader = styled.div`
display: flex;
flex-direction: row;
justify-content: flex-end;
`;
const DropdownText = Text.Link.extend`
padding-top: 3rem;
`;
const DropdownButton = styled.div`
padding: 1 rem 0.75rem;
`;
const ListMenuItem = styled.div`
display: flex;
background-color: grey)};
color: grey};
>[name~=icon] {
right: 0rem;
border-radius: 0;
background: none;
align-items: right;
justify-content: right;
&:hover {
background-color: grey)};
}
&:focus {
outline: none;
}
`;
class ListListMenu extends React.Component {
static propTypes = {
id: PropTypes.string.isRequired,
text: PropTypes.node.isRequired,
items: PropTypes.arrayOf(PropTypes.any).isRequired,
component: PropTypes.func.isRequired,
selectedItem: PropTypes.any,
getItemProps: PropTypes.func.isRequired,
highlightedIndex: PropTypes.number,
closeListMenu: PropTypes.func.isRequired,
};
static defaultProps = {
selectedItem: null,
highlightedIndex: null,
}
onClearClick = (items,item1) => (item) => {
const index = items.indexOf(item1);
if (index > -1) {
items.splice(index, 1);
}
}
render() {
const {
id, text, items, component, selectedItem, getItemProps,
highlightedIndex, closeListMenu,
} = this.props;
return (
<ListWrapper id={id} >
<ListMenuHeader onClick={closeListMenu}>
<DropdownText>{text}</DropdownText>
<DropdownButton
id={`${id}-button`}
>
<Icon type="caret-up" appearance="neutral" />
</DropdownButton>
</ListMenuHeader>
<ListMenu>
{selectedItems.map((item, index) => (
<ListMenuItem
{...getItemProps({
item,
isActive: highlightedIndex === index,
isSelected: _.isEqual(selectedItem, item),
})}
key={index}
>
{React.createElement(component, { item })}
<Button // CLEAR BUTTON
name={item}
id={item}
icon="remove"
onClick={this.onClearClick(items, item)}
circle
display="flat"
appearance="disabled"
id="clear-search-button"
/>
</ListMenuItem>
))}
</ListMenu>
</ListWrapper>
);
}
}
export default ListListMenu;

Here is one way you could probably just have that "x" appear on hover.
Instead of looking for a "hover" event, what about looking for an "onmouseenter" event combined with "onmouseleave"?
Like so...
class Example extends React.Component {
onHover() {
this.refs.deleteX.style.display = "block";
}
onExit() {
this.refs.deleteX.style.display = "none";
}
render() {
return (
<div>
<input onmouseenter={ this.onHover } onmouseleave={ this.onExit } />
<p ref="deleteX">x</p>
</div>
)
}
}
Kind of like this post

Add styles to Styled Component custom Component in React Native

I have button.js:
import React from "react";
import styled from "styled-components";
const StyledButton = styled.TouchableOpacity`
border: 1px solid #fff;
border-radius: 10px;
padding-horizontal: 10px;
padding-vertical: 5px;
`;
const StyledButtonText = styled.Text`
color: #fff;
font-size: 12;
`;
export default ({ children }) => (
<StyledButton>
<StyledButtonText>{children.toUpperCase()}</StyledButtonText>
</StyledButton>
);
And its usage:
import React, { Component } from "react";
import styled from "styled-components";
import Button from "./button";
const StyledNavView = styled.View`
justify-content: flex-end;
flex-direction: row;
background: #000;
padding-horizontal: 10px;
padding-vertical: 10px;
`;
const StyledTodayButton = styled(Button)`
margin: 10px;
`;
export default class Nav extends Component {
render() {
return (
<StyledNavView>
<StyledTodayButton>Today</StyledTodayButton>
<Button>Previous</Button>
</StyledNavView>
);
}
}
Problem is, the margin I apply in StyledTodayButton is actually never applied. Have I misunderstood extending styles in Styled Components?

There are 2 ways to make it work:
extend button style:
const StyledTodayButton = Button.extend'margin: 10px'
pass prop to button:
const Button = styled.button'
/* ...your props */
margin: ${props => props.withMargin ? '10px' : '0px'};
and then call in render method you can invoke it with:
<Button withMargin {...restProps} />