Issue encountered in the tabs section: Upon clicking a tab, an error arises indicating that the style property

Question

Issue encountered in the tabs section: Upon clicking a tab, an error arises indicating that the style property

Seeking to implement a tab section where clicking on a tab reveals content below. I have utilized the code provided in the following CodePen, but encountering an error.

`

Uncaught TypeError: Cannot read properties of undefined (reading 'style')

`

Puzzled by the issue with the logic and why the 'style' property is inaccessible resulting in an error when clicking on a tab.

CodePen Link: https://codepen.io/theSpaceWeasel/pen/XWBKdbP?editors=1111

`

var btns = document.querySelectorAll(".tablinks");
console.log(btns);
var content = document.querySelectorAll(".tabcontent");
console.log(content);

for(var i=0; i<btns.length;i++){
  btns[i].addEventListener('click', function(){
    content[i].style.display = "block";
  })
}

`

javascript css styles typeerror

Answer 1

Answer №1

The challenge presented in the initial code arises from the fact that the content[i] element is recognized as undefined when the event listener callback function is triggered. This occurs because the reference to i reflects its final value at the conclusion of the loop, which is consistently greater than anticipated.

for (var i = 0; i < btns.length; i++) {
  btns[i].addEventListener("click", (function(index) {
    return function() {
      content[index].style.display = "block";
    };
  })(i));
}

In order to address this issue, one potential solution involves implementing a closure to establish a distinct scope for each iteration within the loop. By doing so, a new instance of the variable i can be created, enabling access to the appropriate element within the content array when triggering the event listener callback function.

An alternative approach would be to store the current content element in a variable like:

for (var i = 0; i < btns.length; i++) {
  const ele = content[i];
  btns[i].addEventListener("click", (function() {
      ele.style.display = "block";
  }));
}

Answer 2

The challenge presented in the initial code arises from the fact that the content[i] element is recognized as undefined when the event listener callback function is triggered. This occurs because the reference to i reflects its final value at the conclusion of the loop, which is consistently greater than anticipated.

for (var i = 0; i < btns.length; i++) {
  btns[i].addEventListener("click", (function(index) {
    return function() {
      content[index].style.display = "block";
    };
  })(i));
}

In order to address this issue, one potential solution involves implementing a closure to establish a distinct scope for each iteration within the loop. By doing so, a new instance of the variable i can be created, enabling access to the appropriate element within the content array when triggering the event listener callback function.

An alternative approach would be to store the current content element in a variable like:

for (var i = 0; i < btns.length; i++) {
  const ele = content[i];
  btns[i].addEventListener("click", (function() {
      ele.style.display = "block";
  }));
}

Issue encountered in the tabs section: Upon clicking a tab, an error arises indicating that the style property

Answer №1

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