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event 03: sliding-tree 100%
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‎2-ui/2-events/03-event-delegation/2-sliding-tree/solution.md‎

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The solution has two parts.
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Solusi terbagi atas 2 bagian.
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1. Wrap every tree node title into `<span>`. Then we can CSS-style them on `:hover` and handle clicks exactly on text, because `<span>` width is exactly the text width (unlike without it).
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2. Set a handler to the `tree` root node and handle clicks on that `<span>` titles.
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1. Bungkus setiap node pada pohon kedalam `<span>`. Kemudian kita bisa menambahkan `:hover` dengan CSS-style dan menanggani klik tepat pada teks, karena lebar `<span>` sama dengan lebar tulisan (lebar tidak sama jika tidak menggunakan `<span>`);
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2. Atur sebuah penangan (_handler_) ke `tree` akar dari node dan tanggani setiap klik pada judul `<span>`.

‎2-ui/2-events/03-event-delegation/2-sliding-tree/solution.view/index.html‎

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<body>
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<ul class="tree" id="tree">
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<li>Animals
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<li>Hewan
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<ul>
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<li>Mammals
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<li>Mamalia
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<ul>
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<li>Cows</li>
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<li>Donkeys</li>
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<li>Dogs</li>
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<li>Tigers</li>
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<li>Sapi</li>
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<li>Keledai</li>
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<li>Anjing</li>
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<li>Harimau</li>
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</ul>
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</li>
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<li>Other
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<li>Lain
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<ul>
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<li>Snakes</li>
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<li>Birds</li>
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<li>Lizards</li>
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<li>Ular</li>
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<li>Burung</li>
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<li>Kadal</li>
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</ul>
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</li>
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</ul>
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</li>
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<li>Fishes
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<li>Ikan
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<ul>
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<li>Aquarium
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<li>Akuarium
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<ul>
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<li>Guppy</li>
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<li>Angelfish</li>
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<li>Gupi (ikan seribu)</li>
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<li>Ikan bidadari</li>
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</ul>
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</li>
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<li>Sea
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<li>Laut
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<ul>
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<li>Sea trout</li>
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<li>Trout laut</li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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<script>
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// move all text into <span>
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// they occupy exactly the place necessary for the text,
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// pindahkan semua teks kedalam <span>
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// mereka menempati tempat yang tepat diperlukan untuk teks,
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for (let li of tree.querySelectorAll('li')) {
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let span = document.createElement('span');
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li.prepend(span);
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span.append(span.nextSibling); // move the text node into span
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span.append(span.nextSibling); // memindahkan node teks ke dalam span
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}
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// catch clicks on whole tree
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// tangkap klik pada keseluruhan pohon (tree)
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tree.onclick = function(event) {
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if (event.target.tagName != 'SPAN') {
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return;
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}
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let childrenContainer = event.target.parentNode.querySelector('ul');
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if (!childrenContainer) return; // no children
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if (!childrenContainer) return; // tidak ada elemen bawah
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childrenContainer.hidden = !childrenContainer.hidden;
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}

‎2-ui/2-events/03-event-delegation/2-sliding-tree/source.view/index.html‎

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<body>
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<ul class="tree" id="tree">
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<li>Animals
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<li>Hewan
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<ul>
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<li>Mammals
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<li>Mamalia
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<ul>
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<li>Cows</li>
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<li>Donkeys</li>
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<li>Dogs</li>
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<li>Tigers</li>
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<li>Sapi</li>
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<li>Keledai</li>
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<li>Anjing</li>
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<li>Harimau</li>
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</ul>
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</li>
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<li>Other
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<li>Lain
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<ul>
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<li>Snakes</li>
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<li>Birds</li>
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<li>Lizards</li>
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<li>Ular</li>
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<li>Burung</li>
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<li>Kadal</li>
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</ul>
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</li>
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</ul>
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</li>
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<li>Fishes
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<li>Ikan
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<ul>
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<li>Aquarium
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<li>Akuarium
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<ul>
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<li>Guppy</li>
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<li>Angelfish</li>
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<li>Gupi (ikan seribu)</li>
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<li>Ikan bidadari</li>
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</ul>
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</li>
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<li>Sea
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<li>Laut
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<ul>
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<li>Sea trout</li>
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<li>Trout laut</li>
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</ul>
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</li>
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</ul>

‎2-ui/2-events/03-event-delegation/2-sliding-tree/task.md‎

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---
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# Tree menu
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# Menu pohon (_tree menu_)
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Create a tree that shows/hides node children on click:
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Buat sebuah pohon yang akan menampilkan/menyembunyikan elemen bawahan pada saat di klik:
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[iframe border=1 src="solution"]
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Requirements:
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Syarat:
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- Only one event handler (use delegation)
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- A click outside the node title (on an empty space) should not do anything.
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- Hanya satu penangan peristiwa (_event handler_) gunakan delegasi peristiwa.
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- Klik di luar judul node (pada ruang kosong) tidak boleh melakukan apa-apa.

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