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Ilya Kantor 2019-05-21 18:05:46 +03:00
parent 3ce2d96948
commit 7d6d4366a3
5 changed files with 34 additions and 28 deletions
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8
2-ui/1-document/03-dom-navigation/3-navigation-links-which-null/solution.md
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@ -1,4 +1,6 @@
1. Yes, true. The element `elem.lastChild` is always the last one, it has no `nextSibling`, so if there are children, then yes.
2. No, wrong, because `elem.children[0]` is the first child among elements. But there may be non-element nodes before it. So `previousSibling` may be a text node.
1. Yes, true. The element `elem.lastChild` is always the last one, it has no `nextSibling`.
2. No, wrong, because `elem.children[0]` is the first child *among elements*. But there may exist non-element nodes before it. So `previousSibling` may be a text node. Also, if there are no children, then trying to access `elem.children[0]`
Please note that for both cases if there are no children, then there will be an error. For instance, if `elem.lastChild` is `null`, we can't access `elem.lastChild.nextSibling`.
Please note: for both cases if there are no children, then there will be an error.
If there are no children, `elem.lastChild` is `null`, so we can't access `elem.lastChild.nextSibling`. And the collection `elem.children` is empty (like an empty array `[]`).

4
2-ui/1-document/03-dom-navigation/article.md
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@ -7,7 +7,7 @@ libs:
# Walking the DOM
The DOM allows us to do anything with elements and their contents, but first we need to reach the corresponding DOM object, get it into a variable, and then we are able to modify it.
The DOM allows us to do anything with elements and their contents, but first we need to reach the corresponding DOM object.
All operations on the DOM start with the `document` object. From it we can access any node.
@ -86,7 +86,7 @@ For instance, here `<body>` has children `<div>` and `<ul>` (and few blank text
</html>
```
...And if we ask for all descendants of `<body>`, then we get direct children `<div>`, `<ul>` and also more nested elements like `<li>` (being a child of `<ul>`) and `<b>` (being a child of `<li>`) -- the entire subtree.
...And all descendants of `<body>` are not only direct children `<div>`, `<ul>` but also more deeply nested elements, such as `<li>` (a child of `<ul>`) and `<b>` (a child of `<li>`) -- the entire subtree.
**The `childNodes` collection provides access to all child nodes, including text nodes.**