Changing a class using JavaScript: Adding and removing class dynamics

Currently, I am attempting to create a function that will toggle the visibility of a visual object on and off whenever the user clicks on it. Additionally, I need to implement a click event listener within the HTML class named btn-sauce.

Unfortunately, my current code is not functioning as expected:

function renderWhiteSauce() {
  if (element.classList) {
  element.classList.toggle("btn-sauce.active");
} else {
  var classes = element.className.split(" ");
  var i = classes.indexOf("btn-sauce.active");
  if (i >= 0)
    classes.splice(i, 1);
  else
    classes.push("btn-sauce.active");
    element.className = classes.join(" ");
}

document.querySelector('.btn-sauce.active').addEventListener('click', () => {
  state.sauce = !state.sauce;
  renderEverything();
});
javascript

Answer №1

To easily toggle between classes, you can use the methods classList.add('classname') and classList.remove('classname'). Simply define a class that makes a button active and then add or remove it accordingly.

const button = document.querySelector('.btn-sauce')
button.addEventListener('click', () => { 
 if(button.className.indexOf('active') < 0) {
   button.classList.add('active')
 } else {
   button.classList.remove('active')
 }  
 });

Answer №2

btn-sauce and active are distinct classes, however it seems like you are treating them as one in your code. Remove btn-sauce. (including the dot) from all instances above the querySelector line and then you will be able to toggle the active class on and off.

If the element does not have the "active" class initially, make sure to update 

document.querySelector('.btn-sauce.active')
to 
document.querySelector('.btn-sauce')
.

Lastly, I noticed that you are invoking renderEverything() within your click handler. I assume this is another function which in turn calls renderWhiteSauce(), but just wanted to mention it in case there was a mix-up and they were meant to be the same function.

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