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Clarify axes

This commit is contained in:
Rico Sta. Cruz 2015-04-17 16:54:29 +08:00
parent c71d3f9d1a
commit 9565d413aa
1 changed files with 11 additions and 22 deletions
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xpath.md
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@ -254,27 +254,14 @@ Steps of an expression are separated by `/`, usually used to pick child nodes. T
```sh ```sh
//ul/li # $('ul > li') //ul/li # $('ul > li')
//ul/child::li # $('ul > li') - same
//ul/descendant-or-self::li # $('ul li')
//ul/ancestor-or-self::li # $('ul').closest('li') //ul/ancestor-or-self::li # $('ul').closest('li')
``` ```
{:.light} {:.light}
### Descendant-or-self axis
When you use `//` for descendants, this is short for the `descendant-or-self::` axis.
```sh
# both the same
//div//h4
//div/descendant-or-self::h4
```
```sh
# both the same
//ul//[last()]
//ul/descendant-or-self::[last()]
```
### Child axis ### Child axis
When axis is not specified, a `name` is short for `child::name`. This is what makes `//a/b/c` work. When axis is not specified, a `name` is short for `child::name`. This makes `//a/b/c` work.
```sh ```sh
# both the same # both the same
@ -295,17 +282,19 @@ When axis is not specified, a `name` is short for `child::name`. This is what ma
//ul[count(child::li) > 2] //ul[count(child::li) > 2]
``` ```
### Attribute axis ### Descendant-or-self axis
When you use `@` for attributes, that's short for the `attribute::` axis. When you use `//` for descendants, this is short for the `descendant-or-self::` axis.
```sh ```sh
# both the same # both the same
//a/@href //div//h4
//a/attribute::href //div/descendant-or-self::h4
```
```sh
# both the same # both the same
//div[@id="box"] //ul//[last()]
//div[attribute::id="box"] //ul/descendant-or-self::[last()]
``` ```
### Other axes ### Other axes