en.javascript.info/2-ui/2-events/03-event-delegation/2-sliding-tree/solution.view/index.html
Ilya Kantor 9f6cb376a0 bugfix
2017-08-26 11:28:57 +02:00

80 lines
1.5 KiB
HTML

<!DOCTYPE HTML>
<html>
<head>
<style>
.tree span:hover {
font-weight: bold;
}
.tree span {
cursor: pointer;
}
</style>
<meta charset="utf-8">
</head>
<body>
<ul class="tree" id="tree">
<li>Animals
<ul>
<li>Mammals
<ul>
<li>Cows</li>
<li>Donkeys</li>
<li>Dogs</li>
<li>Tigers</li>
</ul>
</li>
<li>Other
<ul>
<li>Snakes</li>
<li>Birds</li>
<li>Lizards</li>
</ul>
</li>
</ul>
</li>
<li>Fishes
<ul>
<li>Aquarium
<ul>
<li>Guppy</li>
<li>Angelfish</li>
</ul>
</li>
<li>Sea
<ul>
<li>Sea trout</li>
</ul>
</li>
</ul>
</li>
</ul>
<script>
// move all text into <span>
// they occupy exactly the place necessary for the text,
for (let li of tree.querySelectorAll('li')) {
let span = document.createElement('span');
li.prepend(span);
span.append(span.nextSibling); // move the text node into span
}
// catch clicks on whole tree
tree.onclick = function(event) {
if (event.target.tagName != 'SPAN') {
return;
}
let childrenContainer = event.target.parentNode.querySelector('ul');
if (!childrenContainer) return; // no children
childrenContainer.hidden = !childrenContainer.hidden;
}
</script>
</body>
</html>