回答編集履歴
2
例追加
answer
CHANGED
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@@ -8,4 +8,18 @@
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8
8
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}
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9
9
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});
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10
10
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```
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11
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-
[https://www.w3.org/TR/cssom-view-1/#dom-document-elementfrompoint](https://www.w3.org/TR/cssom-view-1/#dom-document-elementfrompoint)
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11
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+
[https://www.w3.org/TR/cssom-view-1/#dom-document-elementfrompoint](https://www.w3.org/TR/cssom-view-1/#dom-document-elementfrompoint)
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12
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+
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13
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+
IntersectionObserver の例
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14
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+
```jQuery
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15
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+
const observer = new IntersectionObserver((entries, observer) => {
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16
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+
const entry = entries.find(a => a.isIntersecting);
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17
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+
if (entry) {
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18
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+
const id = entry.target.id;
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19
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+
$('nav li a[href="#' + id + '"]').closest('li').addClass('selected').siblings().removeClass('selected');
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20
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+
}
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21
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+
}, { rootMargin: '-50%' });
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22
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+
$('section[id]').each((index, element) => observer.observe(element));
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23
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+
```
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24
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+
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25
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+
[https://developer.mozilla.org/ja/docs/Web/API/Intersection_Observer_API](https://developer.mozilla.org/ja/docs/Web/API/Intersection_Observer_API)
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1
不要個所削除
answer
CHANGED
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@@ -8,6 +8,4 @@
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8
8
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}
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9
9
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});
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10
10
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```
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11
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-
[https://www.w3.org/TR/cssom-view-1/#dom-document-elementfrompoint](https://www.w3.org/TR/cssom-view-1/#dom-document-elementfrompoint)
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11
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+
[https://www.w3.org/TR/cssom-view-1/#dom-document-elementfrompoint](https://www.w3.org/TR/cssom-view-1/#dom-document-elementfrompoint)
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12
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-
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13
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-
elementFromPoint
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