I'm trying to create an automatic slideshow in react, using react-slideshow. I'm very new to react and have just begun. I got this code from here.
import React from 'react';
import { Fade } from 'react-slideshow-image';
const images = [
'./img/p1.png',
'./img/p1.png',
'./img/p1.png'
];
const Slideshow = () => {
return (
<Fade
images={images}
duration="5000"
transitionDuration="1000"/>
)
}
What I am not getting is how to make this slideshow actually render. What I have done is called this function from inside a component in the same file i.e.
class App extends Component {
render() {
return (
<div className="App">
{Slideshow();}
</div>
);
}
}
export default App;
This is not rendering any slideshow or image, about which I'm not too surprised. The function is running. I console logged something and it got logged on the console. The rest of the page (I have other divs not shown here) is rendered and there is no error thrown. How to make this work?
Nothing seems wrong in this code.
try defining Slideshow() function inside app component.
make a call like "{ this.Slideshow }".
Check by removing "./" in image path. (Try..)
Also check the path of image. Sometime they refer to public folder outside the src folder. maybe public/images/img.png
Slideshow is a React component, so you need to render it using JSX, not invoke the function:
class App extends Component {
render() {
return (
<div className="App">
<Slideshow/>
</div>
);
}
}
export default App;
Related
How can i declarate componentDidMount without creating class extends react component? For example render() declarates with react-dom package, maybe is exist another package for componentDidMount?
class App extends Component {
constructor(){
// do something
}
componentDidMount(){
// js code must run after page loaded
}
render(){
return(
<div className="app">
</div>
);
}
}
export {App};
The same thing with component constructor()
const App = () => {
// constructor and componentDidMount does not work here
// js code must run after page loaded
return (
<div className="app">
</div>
);
};
export {App};
First of all, what you want to achieve is fully Meteor independent. It's a pure React problem that could exist with any backend. What you want to achieve can be done using the useEffect() hook for which you'll find the documentation right here:
https://reactjs.org/docs/hooks-reference.html#useeffect
Here is a great article explaining how to replace lifecycle methods with hooks:
https://dev.to/trentyang/replace-lifecycle-with-hooks-in-react-3d4n
In your case, for componentDidMount you'll have to do the following:
useEffect(() => {
// js code must run after page loaded
}, []);
In the final array you have to put dependency that will retrigger the hook if you need. To imitate a simple componentDidMount an empty array is generally the solution.
I have a catalago-component.js which is a web component. I'm trying to use this web component like so:
import React from 'react'
import './../../../assets/catalago-component'
class Loja extends React.Component{
constructor(props){
super(props)
this.state = {}
}
render(){
return(
<React.Fragment>
<div className="page-header">
<h1 className="page-title">Loja</h1>
</div>
<catalago-component></catalago-component>
</React.Fragment>
)
}
}
export default Loja
but every time I run my react app I get this error
src\assets\catalago-component.js
Line 1:1: Expected an assignment or function call and instead saw an expression no-unused-expressions
Line 1:85: Expected an assignment or function call and instead saw an expression no-unused-expressions
Line 1:399: Expected an assignment or function call and instead saw an expression no-unused-expressions
Line 1:599: Expected an assignment or function call and instead saw an expression no-unused-expressions
...
but if I do any changes to the app that makes it recompile then it works just fine
how to solve this error forever? I don't want this app breaking every time I run it for the first time
EDIT: I tried to use this web component with pure html and it worked. take a look
https://eduardopreuss.github.io/web-component/
https://github.com/eduardopreuss/web-component
EDIT 2: link to codesandbox using react + web component https://codesandbox.io/s/hopeful-cohen-ut6mv?file=/src/App.js
I think you might want to try something like this:
import Catalago from './../../../assets/catalago-component'
Then use the component like:
<Catalago></Catalago>
Assuming your Web component issomething like this:
class Catalago extends React.Component {
render() {
return <speical-web-stuff><speical-web-stuff>
}
}
See:https://reactjs.org/docs/web-components.html
As said above, you should give your component a name in order to import.
import Catalago from './../../../assets/catalago-component'
However, sth you may pay attention to.
Below syntax expect your component is written in index.js under the folder catalago-component
import Catalago from './assets/catalago-component' //component locate in file name ```index```
import Catalago from './assets/catalago-component/customizedName.js'
which type of export used in that component
import Catalago from './assets/catalago-component/customizedName.js' // exporting via ```export default``` keyword
import { Catalago } from './assets/catalago-component/customizedName.js' //exporting via ```export``` keyword
Inside your webpack.config.js add this line
Than you can use your component from anywhere inside project.
import Catalago from 'Components'
There is nothing wrong how I imported, it was a eslint error just like #tsecheukfung01 said in the comments. So I added my web component to .eslintignore file and It worked just fine.
more ways to ignore eslint errors here
The way you import your component is perfectly fine.
A web-component is nothing more than any other HTMLElement like a <div> or an <a>, meaning this is NOT a React component and cannot be imported and used as such.
Example web-component
export class MyComponent extends HTMLElement {
constructor() {
super();
const shadowRoot = this.attachShadow({mode: 'open'});
shadowRoot.innerHTML = `My Webcomponent!`
}
static get tag() {
return 'my-component';
}
}
customElements.define(MyComponent.tag, MyComponent);
Using the above web-component would look something like:
import './../../../assets/MyComponent.js'
...
render() {
return() {
<div>
<my-component></my-component>
</div>
}
}
import Catalago from './../../../assets/catalago-component'
...
render() {
return() {
<div>
<Catalago //other props/>
</div>
}
}
I've started to code my first React app and it's awesome, but I can't figure out how to manage css files per-component(so the actual CSS won't load if it is not necessary).
React with webpack(correct me if I'm wrong please) wraps the project in such a way that at every given moment the app loads only what it needs(in terms of JS).
So if I have my main App component with only two buttons visible: btn-01 and btn-02, and inside of this component I have another two: component-01 and component-02, and they are hidden till the corresponded button is clicked(btn-01 for component-01), these components won't be loaded until the actual button is clicked(am I getting this right?), however this is not the same with css as I can tell, because I see the css of each of these(component-01 and component-02) components loaded right away the App is loaded, even though none of the buttons are clicked.
I'm not a big fan of inline styling, but I did test it with css module, but the result is the same in this aspect. So I'm not even sure if this is possible to implement in an easy way.
Here's a code, so perhaps I'm not implementing it correctly, but please don't mind the none-DRY code etc.
So as you may see, the style of Component-01 and -02 are loaded even though there is no need for them at the moment(none of the button is pressed).
App.js
import React, { Component } from "react";
import "./App.css";
import Component_01 from "./Component-01/Component-01";
import Component_02 from "./Component-02/Component-02";
class App extends Component {
state = {
isComponent_01: false,
isComponent_02: false,
};
toggleComponent01 = () => {
this.setState({
isComponent_01: !this.state.isComponent_01,
});
};
toggleComponent02 = () => {
this.setState({
isComponent_02: !this.state.isComponent_02,
});
};
render() {
let showComponent_01 = null;
if (this.state.isComponent_01) {
showComponent_01 = <Component_01 />;
}
let showComponent_02 = null;
if (this.state.isComponent_02) {
showComponent_02 = <Component_02 />;
}
return (
<div className="App">
<button className="btn-01" onClick={this.toggleComponent01}>
Btn-01
</button>
<button className="btn-02" onClick={this.toggleComponent02}>
Btn-02
</button>
{showComponent_01}
{showComponent_02}
</div>
);
}
}
export default App;
Component-01.js (and Component-02.js, just with -02.js)
import React from "react";
import style from "./Component-01.module.css";
function App() {
return <div className={style["component-01"]}>Component-01</div>;
}
export default App;
I'm trying to make React component that dynamically imports requested Material-UI icon,
when the page loads. My solution presented here works, but it gives warning
at compile time. Additionally it slows down the compilation of the project.
Any idea on how to do this properly?
https://github.com/jurepetrovic/ordermanager_demo
The main logic is found in App.js, lines 5-10:
import React, { Component } from 'react';
import BarChartIcon from '#material-ui/icons/BarChart';
const MaterialIcon = ({ icon }) => {
console.log("icon: " + icon);
let resolved = require(`#material-ui/icons/${icon}`).default;
return React.createElement(resolved);
}
class App extends Component {
render() {
return (
<div>
<MaterialIcon icon={"PowerSettingsNew"} />
</div>
);
}
}
export default App;
The warning it gives is this:
Compile warning
I finally found the simplest solution to this problem:
import all material icons from the package:
import * as Icons from '#material-ui/icons'
I assume you fetch your icon names from your api and finally you have something like this:
var iconNamesArray = ["FitnessCenter","LocalDrink","Straighten"]
Finally load your Icons like below:
<div className="my-icons-wrapper-css">
{
iconNamesArray.map((el,ind)=>{
let DynamicIcon = Icons[el]
return(
<DynamicIcon className="my-icon-css"/>
);
})
}
</div>
And your icons will appear in the screen.
Does anyone know how to trigger an event whenever a reactnative app is opened? eg. to refresh data whenever a user opens the app again.
Figured it out.
Need to use this. https://facebook.github.io/react-native/docs/appstateios.html#content
Go to that file where navigation starts from.
import React, { Component } from 'react';
import { Root } from './config/router';
class Index extends Component {
componentWillMount(){
//your event function code
}
render() {
return <Root />;
}
}
export default Index;
Here Root contains all screens where navigation starts.