| 1 | --- |
| 2 | depends: |
| 3 | - guide/syntax#code-block |
| 4 | - guide/animations |
| 5 | tags: [codeblock, animation] |
| 6 | description: | |
| 7 | Highlight specific lines in code blocks based on clicks. |
| 8 | --- |
| 9 | |
| 10 | # Line Highlighting |
| 11 | |
| 12 | To highlight specific lines, simply add line numbers within brackets `{}`. Line numbers start counting from 1 by default. |
| 13 | |
| 14 | ````md |
| 15 | ```ts {2,3} |
| 16 | function add( |
| 17 | a: Ref<number> | number, |
| 18 | b: Ref<number> | number |
| 19 | ) { |
| 20 | return computed(() => unref(a) + unref(b)) |
| 21 | } |
| 22 | ``` |
| 23 | ```` |
| 24 | |
| 25 | ## Dynamic Line Highlighting |
| 26 | |
| 27 | To change what's highlighted with multiple clicks, you can use `|` to separate each stage: |
| 28 | |
| 29 | ````md |
| 30 | ```ts {2-3|5|all} |
| 31 | function add( |
| 32 | a: Ref<number> | number, |
| 33 | b: Ref<number> | number |
| 34 | ) { |
| 35 | return computed(() => unref(a) + unref(b)) |
| 36 | } |
| 37 | ``` |
| 38 | ```` |
| 39 | |
| 40 | This will first highlight `a: Ref<number> | number` and `b: Ref<number> | number`, and then `return computed(() => unref(a) + unref(b))` after one click, and lastly, the whole block. |
| 41 | |
| 42 | You can set the line number to `hide` to hide the code block or `none` to not highlight any line: |
| 43 | |
| 44 | ````md |
| 45 | ```ts {hide|none} |
| 46 | function add( |
| 47 | a: Ref<number> | number, |
| 48 | b: Ref<number> | number |
| 49 | ) { |
| 50 | return computed(() => unref(a) + unref(b)) |
| 51 | } |
| 52 | ``` |
| 53 | ```` |
| 54 | |
| 55 | ::: tip |
| 56 | Learn more in the [click animations guide](/guide/animations#positioning). |
| 57 | ::: |
| 58 |