CODEWITHSUNDEEP
javascripthtmlnode.jsreactjs
Rohit Sawant
Rohit Sawant

Reputation: 11

ReactJS code compiled successfully , but not printing on Browser

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

Upvotes: 1

Views: 9947

Answers (3)

Sandesh Vora
Sandesh Vora

Reputation: 1

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("");

Upvotes: 0

Michael
Michael

Reputation: 1

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> 
    );
  }
}

Upvotes: 0

Shaheen Umar
Shaheen Umar

Reputation: 91

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"
    })
  ]
};

Upvotes: 2

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