ReactJS code compiled successfully , but not printing on Browser

Question

After a lot of efforts i was able to install and configure ReactJS. After executing "npm start" command, the code was "COMPILED SUCCESSFULLY" and redirected me to the web browser. But there wasn't any output, ie., the browser was "blank". Can anyone resolve this?? ( my first post here )

Also check the code that i have used..

index.html file

<!DOCTYPE html>
<html lang = "en">
   <head>
      <meta charset = "UTF-8">
      <title>React App</title>
   </head>
   <body>
      <div id = "app"></div>
      <script src = 'index_bundle.js'></script>
   </body>
</html>

App.js

import React, { component } from 'react';
class App extends Component {
    render(){
        return(
        <div>
        <h1> Hello World</h1>
        <p>Hello </p>   
        </div>
        );
    }
}
export default App;

main.js

import React from 'react';
import { render } from 'react-dom';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(<App />, document.getElementById('app'));

package.json snippet

"start": "webpack-dev-server --mode development --open --hot",
    "build": "webpack --mode production"

webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
   entry: './main.js',
   output: {
      path: path.join(__dirname, '/bundle'),
      filename: 'index_bundle.js'
   },
   devServer: {
      inline: true,
      port: 8001
   },
   module: {
      rules: [
         {
            test: /\.jsx?$/,
            exclude: /node_modules/,
            loader: 'babel-loader',
            query: {
               presets: ['es2015', 'react']
            }
         }
      ]
   },
   plugins:[
      new HtmlWebpackPlugin({
         template: './index.html'
      })
   ]
}

The only issue is the output is not getting displayed on browser..

command prompt COMMAND PROMPT AFTER "npm start"

browser output not displaying

Are there any errors in the browser's console?

Clarity
– Clarity

2019-07-16 07:13:59 +00:00
Commented Jul 16, 2019 at 7:13 — Clarity
– Clarity, Commented Jul 16, 2019 at 7:13

Shaheen Umar · Accepted Answer · 2019-07-16 12:20:31Z

2

Add an .babelrc file in root folder with following:

{
    "presets": ["@babel/preset-env", "@babel/preset-react"]
}

And package.json is expected to include following dependencies:

  "devDependencies": {
    "@babel/core": "^7.4.0",
    "@babel/preset-env": "^7.4.2",
    "@babel/preset-react": "^7.0.0",
    "babel-loader": "^8.0.5",
    "css-loader": "^2.1.1",
    "html-loader": "^0.5.5",
    "html-webpack-plugin": "^3.2.0",
    "react": "^16.8.5",
    "react-dom": "^16.8.5",
    "style-loader": "^0.23.1",
    "webpack": "^4.29.6",
    "webpack-cli": "^3.3.0",
    "webpack-dev-server": "^3.2.1"
  }

Update

Also update webpack.config.js to:

const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");

module.exports = {
  entry: "./main.js",
  output: {
    path: path.join(__dirname, "/bundle"),
    filename: "index_bundle.js"
  },
  devServer: {
    inline: true,
    port: 8001
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        loader: "babel-loader"
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: "./index.html"
    })
  ]
};

edited Jul 16, 2019 at 12:20

answered Jul 16, 2019 at 9:20

Shaheen Umar

916 bronze badges

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2 Comments

Rohit Sawant Over a year ago

,babelrc already exists... the code and everything is correct , but not getting why its not executing

Shaheen Umar Over a year ago

Can you share your code to check coz exact above code did work for me.

Tyzoid · Accepted Answer · 2020-01-14 02:59:01Z

0

Check the path and change Component to component.

import React, { Component } from 'react';
class App extends Component {
  render() {
    return (
      <Router>
        <div className="App">
          <Route path="/" component={HomePage} exact  />
        </div>
      </Router> 
    );
  }
}

edited Jan 14, 2020 at 2:59

Tyzoid

1,07813 silver badges31 bronze badges

answered Jan 13, 2020 at 23:37

Michael

1

Comments

Sandesh Vora · Accepted Answer · 2023-06-28 14:56:37Z

0

In component, when using the useState hook to manage the text state. Sometimes, an initial value for the state variable can be missing. When useState is called without an initial value, the state variable (text in this case) will be undefined initially. Eg:

const [text, setText] = useState("");

edited Jun 28, 2023 at 14:56

answered Jun 28, 2023 at 14:55

Sandesh Vora

11 bronze badge

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