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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ally.style.focusSource Example</title>
</head>
<body>
​
<article id="example-introduction">
  <h1><code>ally.style.focusSource</code> Example</h1>
​
  <p>Use <kbd>Tab</kbd> and the mouse (or touch) as well as the buttons to focus the input elements to see them styled differently depending on the input method used.</p>
</article>
​
<div id="example-html">
  <main>
    <button type="button" id="focus-pass">loading&#x2026;</button>
    <button type="button" id="focus-lock" aria-pressed="false">loading&#x2026;</button>
​
    <hr>
​
    <label for="before-input">click me</label>
    <input id="before-input" type="text" value="before styled">
    <div class="example">
      <div id="first-shadow-host"></div>
      <div>
        <input id="outer-input" type="text" value="outer input">
      </div>
    </div>
    <input id="after-input" type="text" value="after styled">
​
    <hr>
​
    <p data-had-focus="pointer">focus was set by pointer at least once</p>
    <p data-had-focus="key">focus was set by keyboard at least once</p>
    <p data-had-focus="script">focus was set by script at least once</p>
  </main>
</div>
​
<script src="https://cdn.jsdelivr.net/ally.js/1.4.1/ally.min.js"></script>
</body>
</html>
​
 
​
body :focus {
  /* default styling in case JS broke */
  background: yellow;
}
html[data-focus-source="initial"] > body :focus {
  /* styling for when focus was given by pointer */
  background: green;
}
html[data-focus-source="pointer"] > body :focus {
  /* styling for when focus was given by pointer */
  background: red;
}
html[data-focus-source="key"] > body :focus {
  /* styling for when focus was given by keyboard */
  background: blue;
}
html[data-focus-source="script"] > body :focus {
  /* styling for when focus was given by neither pointer nor keyboard */
  background: orange;
}
​
p[data-had-focus] {
  display: none;
}
html.focus-source-pointer p[data-had-focus="pointer"],
html.focus-source-key p[data-had-focus="key"],
html.focus-source-script p[data-had-focus="script"] {
  display: block;
}
​
/* separate blocks because ">>>" or "/deep/" might not be supported and thus render the selector void */
.example >>> :focus {
  /* default styling in case JS broke */
  background: yellow;
}
html[data-focus-source="initial"] .example >>> :focus {
  /* styling for when focus was given by pointer */
  background: green;
}
html[data-focus-source="pointer"] .example >>> :focus {
  /* styling for when focus was given by pointer */
  background: red;
}
html[data-focus-source="key"] .example >>> :focus {
  /* styling for when focus was given by keyboard */
  background: blue;
}
html[data-focus-source="script"] .example >>> :focus {
  /* styling for when focus was given by neither pointer nor keyboard */
  background: orange;
}
​
.example /deep/ :focus {
  /* default styling in case JS broke */
  background: yellow;
}
html[data-focus-source="initial"] .example /deep/ :focus {
  /* styling for when focus was given by pointer */
  background: green;
}
html[data-focus-source="pointer"] .example /deep/ :focus {
  /* styling for when focus was given by pointer */
  background: red;
}
html[data-focus-source="key"] .example /deep/ :focus {
  /* styling for when focus was given by keyboard */
  background: blue;
}
html[data-focus-source="script"] .example /deep/ :focus {
  /* styling for when focus was given by neither pointer nor keyboard */
  background: orange;
}
​
 
​
var buttonPass = document.getElementById('focus-pass');
var buttonLock = document.getElementById('focus-lock');
​
var focusSource = ally.style.focusSource();
​
var input = document.getElementById('before-input');
input.focus();
​
buttonPass.textContent = 'focus';
buttonPass.addEventListener('click', function() {
  // passing focus to another element
  input.focus();
}, false);
​
buttonLock.textContent = 'focus (lock)';
buttonLock.addEventListener('click', function() {
  if (this.getAttribute('aria-pressed') !== 'true') {
    this.setAttribute('aria-pressed', 'true');
    buttonLock.textContent = 'unlock';
    // passing focus while the method of input is locked
    focusSource.lock(focusSource.current());
    input.focus();
    
  } else {
    this.setAttribute('aria-pressed', 'false');
    buttonLock.textContent = 'focus (lock)';
    focusSource.lock(false);
  }
}, false);
​
// create shadow dom structure:
if (document.body.createShadowRoot !== undefined) {
  var shadowed = createShadowedContent(
    document.getElementById('first-shadow-host'),
    '<div id="second-shadow-host"></div><div id="third-shadow-host"></div>'
  );
  createShadowedContent(
    shadowed.getElementById('second-shadow-host'),
    '<input id="first-input" type="text" value="::shadow ::shadow input">'
  );
  createShadowedContent(
    shadowed.getElementById('third-shadow-host'),
    '<input id="second-input" type="text" value="::shadow ::shadow input">'
  );
}
​
function createShadowedContent(host, html) {
  var root = host.createShadowRoot();
  root.innerHTML = html;
  return root;
}
​
Output

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