How can i stop a event from targeting?

event stop propagation
stop event capturing
stopimmediatepropagation
event bubbling
event preventdefault
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event propagation
stoppropagation vs preventdefault

I have a bunch of grids with a class called "grid-show". I want to style this specific element that my mouse is over (without using the .hover property in CSS), but when the mouse is not over, I want it to stop and goes back to normal. The "else if" in my example doesent manage to do that.

  let divShow = document.querySelectorAll('.grid-show');

  for(i = 0; i < divShow.length; i++){
    divShow[i].addEventListener('mouseover', function(eve){

      if (eve.target) {
        eve.target.style.color = "orange"
      } else if(!eve.target){
        eve.target.style.color = " ";
      }

    })
  }

Using a CSS based solution would be more elegant, but if you still want to do it programmatically, you could use the "mouseout" event to remove the style:

let divShow = document.querySelectorAll('.grid-show');

for(i = 0; i < divShow.length; i++){
  divShow[i].addEventListener('mouseover', function(event){
    event.target.style.color = "orange"
  })

  divShow[i].addEventListener('mouseout', function(event){
    event.target.style.color = "";
  })
}

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You should use mouseenter instead (which only fires when the mouse enters the targeted container - it doesn't bubble) and add a separate listener for mouseout:

document.querySelectorAll('.grid-show').forEach((div) => {
  div.addEventListener('mouseenter', () => {
    div.style.color = 'orange';
  });
  div.addEventListener('mouseleave', () => {
    div.style.removeProperty('color');
  });
});
<div class="grid-show">foo</div>
<div class="grid-show">bar</div>

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No need for a loop if you use event delegation

document.addEventListener("mouseover", evt => {
  const origin = evt.target;
  if (origin.classList && origin.classList.contains("grid-show")) {
    origin.classList.add("hoverColor");
  }
});

document.addEventListener("mouseout", evt => {
  const origin = evt.target;
  if (origin.classList && origin.classList.contains("grid-show")) {
    origin.classList.remove("hoverColor");
  }
});
.grid-show {
  cursor: pointer;
}

.hoverColor {
  color: orange;
}
<div class="grid-show">div 1</div>
<div class="grid-show">div 2</div>
<div class="grid-show">div 3</div>
<div class="grid-show">div 4</div>

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Comments
  • eve.target will always be truthy. But wouldn't CSS's :hover be a much more elegant solution?
  • Yes it would, however i wanted to do it this way so that i could use it for other purposes later where :hover isnt an option
  • Thank you. Do you know why the event doesent work any longer when i add grids to the div using this function function: postNote(){ show1.innerHTML += ` <div class="grid-show"> <p >${input1.value}</p> </div> `; }
  • If you are you adding the divs after adding the event listeners then it won't work. You could execute again the function that adds the event listeners every time you add a new div, but then, all previous existing divs will have duplicated event listeners. You should consider to create the div elements using createElement and add the event listeners to each one of them before inserting them in the dom, or use "event delegation", as KooiInc proposed in another answer.