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docs: use controllable pattern in components and reactivity doc #135

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docs: use controllable pattern in components and reactivity doc
LuLaValva Mar 12, 2026
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Merge branch 'main' into components-and-reactivity-controllable
LuLaValva Mar 14, 2026
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35 changes: 31 additions & 4 deletions docs/tutorial/components-and-reactivity.md
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Expand Up @@ -57,12 +57,36 @@ Because this is such a common pattern, Marko provides a [shorthand](../reference
<div>It's ${degF}°F</div>
```

## Adding Computed Values
<input type="number" value=degF valueChange(value) { degF = value }>
<div>It's ${degF}°F</div>
```

Now we can use [the `<const>` tag](../reference/core-tag.md#const) to convert to celsius!

```marko
<let/degF=80>

<input type="number" value:=degF>
<div>It's ${degF}°F</div>
```

## Adding Computed Values

The `input` tag contains a _string_, so let's convert it to a number using [the `<const>` tag](../reference/core-tag.md#const).

```marko
<let/degFString="80">
<const/degF=parseFloat(degFString)>

<input type="number" value:=degFString>
<div>It's ${degF}°F</div>
```

Now we can use another `<const>` to convert to celsius!

```marko
<let/degFString="80">
<const/degF=(+degFString)>
<const/degC=(degF - 32) * 5 / 9>

<input type="number" value:parseFloat:=degF>
Expand All @@ -78,7 +102,8 @@ Since `degC` is a [tag variable](../reference/language.md#tag-variables), its ch
Now that we have a reactive variable, let's see what else we can do! Maybe some notes about the temperature, using [conditional tags](../reference/core-tag.md#if--else)?

```marko
<let/degF=80>
<let/degFString="80">
<const/degF=(+degFString)>
<const/degC=(degF - 32) * 5 / 9>

<input type="number" value:parseFloat:=degF>
Expand All @@ -102,7 +127,8 @@ Now that we have a reactive variable, let's see what else we can do! Maybe some
Or what about a temperature gauge, with some fancy CSS?

```marko
<let/degF=80>
<let/degFString="80">
<const/degF=(+degFString)>
<const/degC=(degF - 32) * 5 / 9>

<input type="number" value:parseFloat:=degF>
Expand Down Expand Up @@ -143,7 +169,8 @@ Actually, this is getting a little bit too complex to all put in one place. Mayb

```marko
/* index.marko */
<let/degF=80>
<let/degFString="80">
<const/degF=(+degFString)>
<const/degC=(degF - 32) * 5 / 9>

<input type="number" value:parseFloat:=degF>
Expand Down