What could be causing the malfunction of setTimeout in this specific function?

Developed a custom function that dynamically creates tabs by accepting element IDs as arguments and adding event listeners to respond to click events. Here's the code snippet for reference:

function toggleTabs() {
  var panel = [], li = [];
  for(var i = 1, j = arguments.length; i <= j; i++) {
    li[i] = document.getElementById(arguments[i - 1]);
    panel[i] = 'panel' + i;
  }  
  document.getElementById('toggle').addEventListener('mouseup', function(event) {
    var target = event.target.id;
    for(var i = 1, j = li.length; i <= j; i++) {
      if(li[i].id === target) {
        document.getElementById(panel[i]).style.display = 'block';
        setTimeout(function() {
          document.getElementById(panel[i]).style.opacity = '1';
          window.alert('fired');
        }, 500);
        li[i].className = 'active';
      } else if(target.substring(0,3) === 'tab'){
        document.getElementById(panel[i]).style.display = 'none';
        document.getElementById(panel[i]).style.opacity = '0';
        li[i].className = null;
      }
    }
  }, false);
}
if(url === '/customers') { toggleTabs('tab-c-featured', 'tab-c-view'); }

Although the function works fine, I wanted to add a fade-in effect to the elements when triggered. However, the transition doesn't seem to work due to the display property changes overriding the opacity effect. To address this, I implemented a timeout feature, but it's not functioning properly. I even included a window alert for testing purposes, but it's not firing. Any insights on why this might be happening?

Thank you!

Answer №1

An error may occur when creating deferred function calls within a loop without using closures. The mistake is in this line of code:

document.getElementById(panel[i]).style.opacity = '1';

Once the function is called, panel[i] will only refer to the last element in the list of panels. To prevent this behavior, wrap your function calls in a closure like so:

setTimeout(function (thePanel) {
    return function(){
        // perform necessary actions with thePanel
    }
}(panel[i]), 500);

For more information on this problem, visit this Stack Overflow thread.

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