用于多个 Div 类元素的 Javascript OnClick 函数，单击时显示文本块

Question

I am trying to enable an Onclick event to fire up when any of my div elements that match the div class "Clicker" is clicked on. However iI am not so good with JavaScript and do not know how to go about this. I was successful when I used the "document.getElementById" when my divs were made into Id and not "Class" elements but only one could function. see my code below;

 document.getElementsByClassName("Clicker").addEventListener("click", function () { var infoBox = document.getElementsByClassName("thumbnail-reveal-txt"); if (infoBox.style.display == "none") { infoBox.style.display = "block"; } else { infoBox.style.display = "none"; } })

 <div class="thumbnail-reveal-txt" style="position: absolute; display: none;"> <div class="thumbnail-reveal-txt" style="position: absolute; display: none;"> <div class="thumbnail-reveal-txt" style="position: absolute; display: none;">

Answer 1

You can use querySelector and querySelectorAll

 document.querySelector(".Clicker").addEventListener("click", function () { const infoBox = document.querySelectorAll(".thumbnail-reveal-txt"); infoBox.forEach(i => { if (i.style.display == "none") { i.style.display = "block"; } else { i.style.display = "none"; } }) })

 <button class="Clicker">click</button> <div class="thumbnail-reveal-txt" style="position: absolute; display: none;">1</div> <div class="thumbnail-reveal-txt" style="position: absolute; display: none;">2</div> <div class="thumbnail-reveal-txt" style="position: absolute; display: none;">3</div>

Answer 2

When you use getElementsByClassName, you're not specifying wich of the elements you are trying to change the className property.

For that, you can use a loop

document.getElementsByClassName("Clicker").addEventListener("click", function () {
  var infoBox = document.getElementsByClassName("thumbnail-reveal-txt");

for (let i = 0; i < infoBox.length; i +=1) {

if (infoBox[i].style.display == "none") {
    infoBox[i].style.display = "block";
  } else {
    infoBox[i].style.display = "none";
  }

}
 


})