How i convert a javascript functionality to React.js

Question

I want to convert javascript code to Reactjs. How i write this kind of code in React.js. Help me to explain how i do this in react.js. I also mention my react code, where I did wrong in the code and what can in do to run my code properly.

const select = document.querySelector('select');
const html = document.querySelector('html');
document.body.style.padding = '10px';

function update(bgColor, textColor) {
  html.style.backgroundColor = bgColor;
  html.style.color = textColor;
}

select.onchange = function() {
  ( select.value === 'black' ) ? update('black','white') : update('white','black');
}

<--Html--> This is Html Code which i want to convert it all in jsx file i React.js
<html>
<body>
<label for="theme">Select theme: </label>
<select id="theme">
  <option value="white">White</option>
  <option value="black">Black</option>
</select>

<h1>This is my website</h1>
</body>
</html>

<-- React.js--> where I did wrong in the code and what can in do to run my code properly.

import React from 'react';

import './App.css';

class App extends React.Component{
  constructor(){
    super();
    this.state={
      whether:'',
      color:''
    }
    }

    
  change=(event)=>{
    this.setState({whether: event.target.value});
  }
  handleChange=(event)=>{
    this.setState({color: event.target.value});
  }

  render(){
   
    let pop=this.state.color;

    return(

     <div>
       
       <label for="weather">Select the weather type today: </label>
<select id="weather" onChange={this.change} >
  <option value="">--Make a choice--</option>
  <option value="Its sunny Today">Sunny</option>
  <option value="ITS Rainy Today">Rainy</option>
  <option value="snowing">Snowing</option>
  <option value="overcast">Overcast</option>
</select>

<label for="theme">Select theme: </label>
<select id="theme" onChange={this.handleChange} >
  <option value="white">White</option>
  <option value="black">Black</option>
</select>

<h1 style={{backgroundColor:{this.state.color}}} >{this.state.whether}</h1>
     </div>
     
    )
  }
}

export default App;

You can convert but before that you need to learn Reactjs then you can convert easily — Wajid
– Wajid, Commented Mar 2, 2021 at 9:18
Actually, I already learning React.js but i stuck here and cannt convert this code in react.js — Abhay Kumar
– Abhay Kumar, Commented Mar 2, 2021 at 9:20
And what is the issue? Is there an error message? Behavior not correct? What specifically should we be looking to help with? Is it an issue with the background color? — Drew Reese
– Drew Reese, Commented Mar 2, 2021 at 9:30
Yes, the issue is with the background color is not changing when I run the code. I want to do this when I select black in the dropdown menu the h1 element changes its background-color to black. and when I choose white then it changes to white background — Abhay Kumar
– Abhay Kumar, Commented Mar 2, 2021 at 9:40

alireza · Accepted Answer · 2021-03-02 09:37:14Z

1

You should fix style in h1 tag

<h1 style={{backgroundColor:`${this.state.color}`}} >{this.state.whether}</h1>

answered Mar 2, 2021 at 9:37

alireza

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