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Use keyed lists in tutorial example #2948

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merged 4 commits into from Nov 8, 2022
Merged

Use keyed lists in tutorial example #2948

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daac993
Use keyed lists in tutorial example
Nov 3, 2022
ef7d8fc
Add keys explanation when it is first introduced
Nov 3, 2022
c10fcc8
Fix link to keyed lists
Nov 4, 2022
0faea9e
Add forgotten key prop
Nov 7, 2022
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10 changes: 7 additions & 3 deletions website/docs/tutorial/index.mdx
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Expand Up @@ -243,10 +243,14 @@ mapping it to `html!` and collecting it as `Html`:

```rust ,ignore
let videos = videos.iter().map(|video| html! {
<p>{format!("{}: {}", video.speaker, video.title)}</p>
<p key={video.id}>{format!("{}: {}", video.speaker, video.title)}</p>
}).collect::<Html>();
```

:::tip
Keys on list items helps Yew keep track of which items have changed in the list, resulting in faster re-renders. [It is always recommended to use keys in lists](/concepts/html/lists.mdx#keyed-lists).
:::

And finally we need to replace the hardcoded list of videos with the `Html` we created from data:

```rust ,ignore {6-10}
Expand Down Expand Up @@ -301,7 +305,7 @@ struct VideosListProps {
#[function_component(VideosList)]
fn videos_list(VideosListProps { videos }: &VideosListProps) -> Html {
videos.iter().map(|video| html! {
<p>{format!("{}: {}", video.speaker, video.title)}</p>
<p key={video.id}>{format!("{}: {}", video.speaker, video.title)}</p>
}).collect()
}
```
Expand Down Expand Up @@ -333,7 +337,7 @@ Now, we can update our `App` component to make use of `VideosList` component.
fn app() -> Html {
// ...
- let videos = videos.iter().map(|video| html! {
- <p>{format!("{}: {}", video.speaker, video.title)}</p>
- <p key={video.id}>{format!("{}: {}", video.speaker, video.title)}</p>
- }).collect::<Html>();
-
html! {
Expand Down