React doesn't render - javascript

I am begining with React using Webpack to make the configuration. I made all step by step. No error message on console or browser but the h1 that I want to insert doesn't appear.
I know that React is v.18 but I am using React v.17
App.jsx
import React from 'react'
const App = () => {
return (
<h1>Holaaa</h1>
);
}
export default App;
index.js
import React from 'react';
import ReactDOM from 'react-dom';
import App from './components/app.jsx';
ReactDOM.render (<App/>, document.getElementById ("Hello"))
webpack.config.js
const path = require ("path");
const HtmlWebpackPlugin = require ('html-webpack-plugin')
const MiniCssExtractPlugin = require ('mini-css-extract-plugin')
module.exports = {
entry: "./src/index.js",
output: {
path: path.resolve (__dirname, 'dist'),
filename: "bundle.js"
},
mode: "development",
resolve: {
extensions: ['.js', '.jsx']
},
module: {
rules: [
{test: /\.(js|jsx)$/,
exclude: "/node_modules",
use: {
loader: 'babel-loader',
options: {
presets: ['#babel/preset-env', '#babel/preset-react']
}
}},
{test: /\html$/,
use: [
{loader: 'html-loader'}
] },
{test: /\.sa[ac]ss$/,
use: ['css-loader',
'style-loader',
'sass-loader']}
]
},
plugins: [
new HtmlWebpackPlugin ({
inject: true,
template: "./public/index.html",
filename: '/menu.html'
}), new MiniCssExtractPlugin ({
filename: "[name].css"
})
]
}
index.html
<title>Document</title>
</head>
<body>
<div id="Hello"> </div>
</body>
</html>

I found the solution. It was the filename config. Was /menu.html. So when localhost was with /menu.html, React render the h1 element.
So, to make render I only have to change /menu.html for index.html in the filename config, refresh and was done!

Related

Webpack-dev-server is very slow?

Webpack-dev-server is so slow in rebuilding my simple app, my app is just one component, index.js
This is config.webpack.js file:
const path = require('path');
const HTMLplugin = require('html-webpack-plugin');
const htmlplugin = new HTMLplugin({
template: './public/index.html'
});
const rules = [
{
test: /\.js$/,
exclude: /node_modules/,
use: {
loader: 'babel-loader'
}
},
{
test: /\.css$/,
exclude: /node_modules/,
use: ['style-loader', 'css-loader']
}
];
module.exports = {
entry: path.join(__dirname, 'src', 'index.js'),
output: {
filename: 'bundle.js',
path: path.resolve(__dirname, './build')
},
module: { rules },
plugins: [htmlplugin]
}
index.js file:
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App'
const App = () => {
return (
<p>Hello World</p>
)
}
ReactDOM.render(<App />, document.getElementById('root'));
I am new to webpack and i can't really understand why it is that slow although i only have one simple component in my project, i don't know if i should show my package.json file or not as i think it is not related to my problem
What am i doing wrong??

React-Router subroutes not displaying

It seems that when webpack builds the file the output can only see the maincard div and none of the contents therein. I'm not sure what's missing as when this is run as npm react-scripts start it works fine. I'm not sure what i'm missing from webpack for this to render correctly. I'm trying to load this into an S3 bucket so it has to be packed with the webpack.
import React from 'react';
import { connect } from 'react-redux';
import { Route, withRouter } from 'react-router-dom';
import { fetchUserList } from "../actions/UserActions";
import { fetchSkillList } from "../actions/SkillActions";
import WelcomeCard from "./WelcomeCard";
import UserSearchCard from "./UserSearchCard";
import AddUserCard from './AddUserCard';
import '../styles/MainCard.css';
class MainCard extends React.Component {
componentDidMount() {
this.props.fetchUserList();
this.props.fetchSkillList();
}
render() {
return (
<div className="main_card">
<Route exact path='/' component={WelcomeCard}/>
<Route path='/list' component={UserSearchCard}/>
<Route path='/new' component={AddUserCard}/>
</div>
);
}
}
const mapDispatchToProps = dispatch => {
return {
fetchUserList: () => dispatch(fetchUserList()),
fetchSkillList: () => dispatch(fetchSkillList())
}
};
export default withRouter( connect(undefined, mapDispatchToProps)(MainCard) );
Webpack Config:
let path = require('path');
let webpack = require('webpack');
const publicPath = '/dist/build/';
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
module.exports = {
//Content
entry: './src/index.js',
mode: 'development',
// A SourceMap without column-mappings ignoring loaded Source Maps.
devtool: 'cheap-module-source-map',
plugins: [
new webpack.DefinePlugin({
'process.env': {
'NODE_ENV': JSON.stringify('development')
}
}),
//simplifies creation of HTML files to serve your webpack bundles. This is especially useful for webpack bundles that include a hash in the filename which changes every compilation. You can either let the plugin generate an HTML file for you, supply your own template using lodash templates or use your own loader.
new HtmlWebpackPlugin({
title: 'Talent Identification Manager'
}),
//Auto replacement of page when i save some file, even css
new webpack.HotModuleReplacementPlugin(),
new MiniCssExtractPlugin({
filename: "[name].css",
chunkFilename: "[id].css"
})
],
output: {
path: path.join(__dirname, publicPath),
filename: 'main.bundle-0.0.1.js',
publicPath: "/",
sourceMapFilename: 'main.map',
},
devServer: {
port: 3000,
host: 'localhost',
//Be possible go back pressing the "back" button at chrome
historyApiFallback: true,
noInfo: false,
stats: 'minimal',
publicPath: publicPath,
contentBase: path.join(__dirname, publicPath),
//hotmodulereplacementeplugin
hot: true
},
module: {
rules: [
{
test: /\.jsx?$/,
exclude: /node_modules(?!\/webpack-dev-server)/,
loader: 'babel-loader',
query: {
presets: ['react', 'es2015', 'stage-2'],
plugins: ['syntax-decorators']
}
},
{
test: /\.css$/,
use: [
MiniCssExtractPlugin.loader,
'css-loader'
]
},
{
test: /\.(png|svg|jpg|gif)$/,
use: [
'file-loader'
]
}
]
}
}
React Router doesn't know that you want to treat /talentidbucket as the base of your site, so you have explicitly tell it so by passing the base path as the basename prop of the BrowserRouter component in production.
class App extends React.Component {
render() {
return (
<BrowserRouter basename="/talentidbucket"> {/* ... */} </BrowserRouter>
);
}
}

How to use React.js with AdonisJs

How can I use React.js in the front-end of my AdonisJs project?
I've tried to install react with npm install react I thought this will works correctly. I made a file app.js with this code:
var React = require('react');
var ReactDOM = require('react-dom');
export default class Index extends Component {
render() {
return (< h1 > hello world! < /h1>)
}
}
ReactDOM.render( < Index / > , document.getElementById('example'))
But this isn't working at all, I don't know what to do more I have searched about how to use React in Adonis but I didn't find anything interesting.
I strongly suggest you to use WebPack for this task.
create a webpack.config.js file in your root directory:
maybe your code need some changes but this is the idea:
const webpack = require('webpack');
var CopyWebpackPlugin = require('copy-webpack-plugin');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var path = require('path');
var pkgBower = require('./package.json');
module.exports = {
target: "web",
devtool: "source-map",
node: {
fs: "empty"
},
entry: {
'app': path.join(__dirname, 'react-app', 'Index.jsx')
},
resolve: {
modules: [__dirname, 'node_modules', 'bower_components'],
extensions: ['*','.js','.jsx', '.es6.js']
},
output: {
path: path.join(__dirname, 'public', 'src'),
filename: '[name].js'
},
resolveLoader: {
moduleExtensions: ["-loader"]
},
module: {
loaders: [
{
test: /jquery\.flot\.resize\.js$/,
loader: 'imports?this=>window'
},
{
test: /\.jsx?$/,
exclude: /(node_modules|bower_components)/,
loader: 'babel-loader',
query: {
presets: ['es2015', 'react', 'stage-0'],
compact: false
}
},
{
test: /\.css$/,
use: ExtractTextPlugin.extract({
fallback: "style-loader",
use: "css-loader"
})
},
{
test: /\.woff|\.woff2|\.svg|.eot|\.ttf/,
loader: 'url?prefix=font/&limit=10000'
},
{
test: /\.(png|jpg|gif)$/,
loader: 'url?limit=10000'
},
{
test: /\.scss$/,
loader: 'style!css!sass?outputStyle=expanded'
}
]
},
plugins: [
new ExtractTextPlugin("styles.css"),
new webpack.DefinePlugin({
'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV)
}),
new CopyWebpackPlugin([{
from: 'img',
to: 'img',
context: path.join(__dirname, 'react-app')
}, {
from: 'server',
to: 'server',
context: path.join(__dirname, 'react-app')
}, {
from: 'fonts',
to: 'fonts',
context: path.join(__dirname, 'react-app')
}]),
new webpack.ProvidePlugin({
$: 'jquery',
jQuery: 'jquery',
'window.jQuery': 'jquery'
}),
new webpack.optimize.DedupePlugin(),
new webpack.optimize.OccurrenceOrderPlugin(),
new webpack.optimize.UglifyJsPlugin({
compress: { warnings: false },
mangle: true,
sourcemap: false,
beautify: false,
dead_code: true
}),
new webpack.ContextReplacementPlugin(/\.\/locale$/, 'empty-module', false, /js$/)
]
};
Then put your app in your root directory, in a folder react-app/ and your components can go inside that folder:
For example your file: [Index.jsx]
import React from 'react';
import ReactDOM from 'react-dom';
class Index extends Component {
render() {
return (< h1 > hello world! < /h1>)
}
}
ReactDOM.render( < Index / > , document.getElementById('example'));
you don't need to export this Index component in this case, but in case you need to just use export default ComponentName at the end of your component file.
The next step is in your routes file (I'm using AdonisJS 4) but is very similar for the version 3.x
Route.any("*", ({ view, response }) => (
view.render('index')
))
Then your index (.njk, or .edge) file (under resources/views) should look something like this:
<html>
<head>
<link rel="stylesheet" href="/src/styles.css">
<script type="text/javascript" src="/src/app.js"></script>
</head>
<body>
<div id="example"></div>
</body>
</html>
--
You need to install some npm/ packages with npm or yarn,
and remember to run in another terminal window or tab,
webpack -d --watch --progress
Regards.
This works. You are missing React.Component.
var React = require('react');
var ReactDOM = require('react-dom');
export default class Index extends React.Component {
render() {
return (< h1 > hello world! < /h1>)
}
}
ReactDOM.render( < Index / > , document.getElementById('example'))
Alternatively you can use import React, {Component} from 'react'; if you want to use your code structure.
For decoupled use, just build your React app and copy the build to Adonis public folder.

Webpack SCSS to CSS extraction not working

I am trying to extract SCSS to CSS on my react.js app using webpack plugin: extract-text-webpack-plugin. I am not getting any errors but i can't see any style on my page when i compile. In the following code i am simply trying to change the color of hello world rendered on the screen from black to red. Here are my files:
webpack.config.js
var webpack = require('webpack');
var path = require('path');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
module.exports = {
devtool: 'inline-source-map',
entry: [
'webpack-dev-server/client?http://127.0.0.1:8080/',
'webpack/hot/only-dev-server',
'./src/index.js',
'./sass/styles.scss'
],
output: {
path: path.join(__dirname, 'public'),
filename: 'bundle.js'
},
resolve: {
modules: ['node_modules', 'src'],
extensions: ['.js', '.jsx']
},
module: {
rules: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
use: ['react-hot-loader', 'babel-loader']
},
{ // regular css files
test: /\.css$/,
loader: ExtractTextPlugin.extract({
loader: 'css-loader?importLoaders=1',
}),
},
{ // sass / scss loader for webpack
test: /\.(sass|scss)$/,
loader: ExtractTextPlugin.extract(['css-loader', 'sass-loader'])
}
]
},
plugins: [
new webpack.HotModuleReplacementPlugin(),
new webpack.NoEmitOnErrorsPlugin(),
new ExtractTextPlugin("styles.css")
]
};
styles.scss
$color : red;
.hello{
font-color: $color;
text-align: center;
}
app.js
import React from 'react';
export default class App extends React.Component {
render() {
return (
<div>
<h1 className = "hello">Hello World</h1>
</div>);
}
}
index.js
import React from 'react';
import { render } from 'react-dom';
import App from './components/app';
render ( <App />, document.getElementById('app'));
What i'm I missing?
you're missing style-loader from your loader chain.
from the sass-loader docs:
Chain the sass-loader with the css-loader and the style-loader to immediately apply all styles to the DOM.
// webpack.config.js
module.exports = {
...
module: {
rules: [{
test: /\.scss$/,
use: [{
loader: "style-loader" // creates style nodes from JS strings
}, {
loader: "css-loader" // translates CSS into CommonJS
}, {
loader: "sass-loader" // compiles Sass to CSS
}]
}]
}
};
you need import styles.scss in code index.js
import 'yourlink/styles.scss'

Babel Webpack ES6 React : require is not defined

Despite heavy efforts to my knowledge, I am not able to get:
ReactDebugTool.js:14 Uncaught ReferenceError: require is not defined(…)
I have written a webpack config as below:
// webpack.config.babel.js
import path from 'path';
import webpack from 'webpack';
import HtmlWebpackPlugin from 'html-webpack-plugin';
import ExtractTextPlugin from 'extract-text-webpack-plugin';
const sharedConfiguration = {
cache: true,
context: __dirname,
entry: {
app: ["./example/example.js"],
styles: ["./example/example.scss"]
},
devtool: "source-map",
resolve: {
extensions: ["", ".js"]
},
module: {
preLoaders: [
{ test: /\.js$/, loaders: ["eslint", "eslint-loader"] }
],
loaders: [
{ test: /\.js$/, loader: "babel-loader", exclude: /node_modules/, query: { presets: ["es2015", "stage-0", "react"], plugins: ['transform-runtime'] } },
{ test: /\.(scss|sass)$/, loader: ExtractTextPlugin.extract("style-loader", "css-loader?sourceMap!resolve-url-loader!sass-loader?sourceMap") },
{ test: /\.html$/, loaders: ["html-loader"] },
{ test: /\.(jpg|png|woff|woff2|eot|ttf|svg|ico)$/, loader: "file-loader?name=[name]-[hash].[ext]" },
{ test: /\.(json|geojson)$/, loader: "json-loader" }
],
noParse: /ol\.js/
},
eslint: {
configFile: './.eslintrc'
}
};
const developmentConfiguration = {
watch: true,
output: {
pathinfo: true,
filename: "[name]-[chunkhash].js",
path: path.resolve("./.tmp")
},
devServer: {
port: 8081
},
plugins: [
new ExtractTextPlugin("[name]-[chunkhash].css"),
new webpack.optimize.CommonsChunkPlugin({
name: "vendor"
}),
new HtmlWebpackPlugin({
template: "./example/example.ejs",
inject: false
})
]
};
let environmentConfiguration = developmentConfiguration;
const configuration = {
...sharedConfiguration,
...environmentConfiguration
};
export default configuration;
And my project holds a folder structure like this.
// example.ejs
<!DOCTYPE html>
<html>
<head>
<title>Editor</title>
<script src="<%= htmlWebpackPlugin.files.chunks.vendor.entry %>"></script>
<link rel="stylesheet" href="<%= htmlWebpackPlugin.files.chunks.styles.css[0] %>">
</head>
<body>
<div id="root"></div>
<script src="<%= htmlWebpackPlugin.files.chunks.app.entry %>"></script>
</body>
</html>
// example.js
import React from 'react';
import ReactDOM from 'react-dom';
import Hello from '../source/index';
ReactDOM.render(<Hello />, document.getElementById('root'));
// source/index.js
import React, {Component} from 'react';
export default class Hello extends Component {
render () {
return (
<div>
Hello
</div>
);
}
}
Most of the articles I referred, indicated to CommonsChunkPlugin I tried rectifying it, but was in vain. Any help would be appreciated.

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