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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ally.maintain.hidden Example</title>
</head>
<body>
​
<article id="example-introduction">
  <h1><code>ally.maintain.hidden</code> Example</h1>
​
  <p>
    Use the <code>toggle hidden</code> button to hide all elements (except the buttons and what&apos;s within the blue border).
    Use the <code>add elements</code> button to see that the <code>aria-hidden</code> attribute is applied to dynamically added content as well.
    Note that the hidden elements are visualized with red border and background only for this demo.
  </p>
</article>
​
<div id="example-html">
  <main>
    <button id="toggle" type="button">toggle hidden</button>
    <button id="add" type="button">add elements</button>
​
    <hr>
​
    <div id="uncle-1">
      <div id="cousin-1">Cousin</div>
    </div>
    <div id="parent">
      <div id="target">Target</div>
      <div id="sibling">Sibling</div>
    </div>
    <div id="uncle-2">
      <div id="cousin-2">Cousin 2</div>
      <div id="target-2">Target 2</div>
    </div>
  </main>
</div>
​
<script src="https://cdn.jsdelivr.net/ally.js/1.4.1/ally.min.js"></script>
</body>
</html>
​
 
​
div {
  margin: 10px;
  border: 2px solid grey;
  padding: 5px;
}
​
[aria-hidden] {
  border: 2px solid red;
  background: rgba(254, 0, 0, 0.3);
}
​
#target,
#target-2 {
  border: 2px solid blue;
  background: white;
}
 
​
var handle;
​
var wrapper = document.getElementById('example-html');
var uncle = document.getElementById('uncle-1');
var target = document.getElementById('target');
​
var toggle = document.getElementById('toggle');
var add = document.getElementById('add');
​
toggle.addEventListener('click', function() {
  if (handle) {
    handle.disengage();
    handle = null;
  } else {
    handle = ally.maintain.hidden({
      context: wrapper,
      filter: '#target, target-2, #toggle, #add'
    });
  }
});
​
add.addEventListener('click', function() {
  var elementWrapper = document.createElement('div');
  elementWrapper.textContent = "new uncle should be hidden";
  wrapper.appendChild(elementWrapper);
​
  var elementUncle = document.createElement('div');
  elementUncle.textContent = "new cousin should be hidden";
  uncle.appendChild(elementUncle);
​
  var elemenTarget = document.createElement('div');
  target.appendChild(elemenTarget);
  elemenTarget.textContent = "should not be hidden";
});
​
Output

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