Make Collapsible Divs NOT hidden by default

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I am using the Collapsible divs code from here: https://www.w3schools.com/howto/howto_js_collapsible.asp

The collapsible divs are hidden by default, but I can’t figure out how to edit the JavaScript to make it so they are all visible by default & only hidden when you click the button to hide them.

Code from Example:

HTML

<button type="button" class="collapsible">Open Collapsible</button>
<div class="content">
  <p>Lorem ipsum...</p>
</div>

CSS

/* Style the button that is used to open and close the collapsible content */
.collapsible {
  background-color: #eee;
  color: #444;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;
}

/* Add a background color to the button if it is clicked on (add the .active class with JS), and when you move the mouse over it (hover) */
.active, .collapsible:hover {
  background-color: #ccc;
}

/* Style the collapsible content. Note: hidden by default */
.content {
  padding: 0 18px;
  display: none;
  overflow: hidden;
  background-color: #f1f1f1;
}

Java-Script

var coll = document.getElementsByClassName("collapsible");
var i;

for (i = 0; i < coll.length; i++) {
  coll[i].addEventListener("click", function() {
    this.classList.toggle("active");
    var content = this.nextElementSibling;
    if (content.style.display === "block") {
      content.style.display = "none";
    } else {
      content.style.display = "block";
    }
  });
}

Any help would be much appreciated. Thanks! – Lauren

Answer

You do have to change the css of .content to display: block; but also, you’ll have to change the JavaScript so that when you click on the open collapsible it closes. Otherwise, you’ll have to click on it twice for it to close, as on the first click it still doesn’t have any content.style.display.

In particular this check here:

if (!content.style.display || content.style.display === "block") {
  content.style.display = "none";
} else {
  content.style.display = "block";
}

See the snippet below:

var coll = document.getElementsByClassName("collapsible");
var i;

for (i = 0; i < coll.length; i++) {
  coll[i].addEventListener("click", function() {
    this.classList.toggle("active");
    var content = this.nextElementSibling;

    if (!content.style.display || content.style.display === "block") {
      content.style.display = "none";
    } else {
      content.style.display = "block";
    }
  });
}
.collapsible {
  background-color: #777;
  color: white;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;
}

.active,
.collapsible:hover {
  background-color: #555;
}

.content {
  padding: 0 18px;
  display: block;
  overflow: hidden;
  background-color: #f1f1f1;
}
<h2>Collapsibles</h2>

<p>A Collapsible:</p>
<button type="button" class="collapsible">Open Collapsible</button>
<div class="content">
  <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
  </p>
</div>

<p>Collapsible Set:</p>
<button type="button" class="collapsible">Open Section 1</button>
<div class="content">
  <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
  </p>
</div>
<button type="button" class="collapsible">Open Section 2</button>
<div class="content">
  <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
  </p>
</div>
<button type="button" class="collapsible">Open Section 3</button>
<div class="content">
  <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
  </p>
</div>


Source: stackoverflow