What does the error message "Uncaught TypeError: Cannot access property 'style' of an undefined object" mean?

I've been attempting to execute the code below, but I keep encountering an error. I even tried including document.addEventListener('DOMContentLoaded', (event) => yet it still doesn't work. Interestingly, there are no errors if I run the code in the console. It runs without any issues on the initial load, but upon refreshing the page, the errors start appearing.

import './Slider.css';
import Acc from './Accomodation/Acc'
import Flora from './Flora/Flora'
import Food from './OurFood/Food.js'
import Trek from './Treks/Treks';
import View from './OurView/View';
import Indoor from './IndoorGames/games';
let slideIndex = 0;
SlideShow()

function SlideShow(){
    
  let slides = document.getElementsByClassName("slide")
  console.log(slides)
  for (let i = 0; i < slides.length; i++) {
      slides[i].style.display = "none"; 
  }
  slideIndex++;
  console.log(slideIndex)
  console.log(slides)
  if (slideIndex === 0) {slideIndex = 1}
  else if (slideIndex === slides.length) {slideIndex = 1} 
  else if (slideIndex > slides.length) {slideIndex = 1} 
  console.log(slides[slideIndex])
  slides[slideIndex-1].style.display = "block"; 

  setTimeout(SlideShow, 10000);

}

function Slider() {


    return (
    <div className='Slider'>
        <h1>Experiences</h1>
        <hr />
        <div className='MySlides'>
        <div className='1 slide fade'>
        <Acc></Acc>
        </div>
        <div className='2 slide fade'>
        <Flora></Flora>
        </div>
        <div className='3 slide fade'>
        <Food></Food>
        </div>
        <div className='4 slide fade'>
        <Trek></Trek>
        </div>
        <div className='5 slide fade'>
        <View></View>
        </div>
        <div className='6 slide fade'>
        <Indoor></Indoor>
        </div>
        </div>
        
        </div>
    
    )  

    
}

export default Slider;

Answer №1

An issue has been detected:

Uncaught TypeError: Cannot read property 'style' of undefined

The error message indicates that your code is attempting to access the style property, but it seems that a specific object does not contain this property. Let me clarify with an example:

const someObject = { // this is the object
 style: 'some value' // this is the property
}

To resolve this error, you will need to identify the parent objects in your code that reference the style property:

  1. slides[i].style.display = "none";
    -> the parent object here is slides[i]
  2. slides[slideIndex-1].style.display = "block";
    -> the parent object here is slides[slideIndex-1]

It appears that the objects slides[i] or slides[slideIndex-1] do not have the style property.

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