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Basic Svelte
Introduction
Reactivity
Props
Logic
Events
Bindings
Classes and styles
Actions
Transitions
Advanced Svelte
Advanced reactivity
Reusing content
Motion
Advanced bindings
Advanced transitions
Context API
Special elements
<script module>
Next steps
Basic SvelteKit
Introduction
Routing
Loading data
Headers and cookies
Shared modules
Forms
API routes
$app/state
Errors and redirects
Advanced SvelteKit
Hooks
Page options
Link options
Advanced routing
Advanced loading
Environment variables
Conclusion

DOMの中では、全てが文字列(string)です。これは、数値の input(type="number"type="range")を扱う際、その値を取り出す時に input.value を使わなければならないため、不便です。

bind:value を使用すれば、Svelte がそれを代行してくれます。

App
<label>
	<input type="number" bind:value={a} min="0" max="10" />
	<input type="range" bind:value={a} min="0" max="10" />
</label>

<label>
	<input type="number" bind:value={b} min="0" max="10" />
	<input type="range" bind:value={b} min="0" max="10" />
</label>

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<script>
	let a = $state(1);
	let b = $state(2);
</script>
 
<label>
	<input type="number" value={a} min="0" max="10" />
	<input type="range" value={a} min="0" max="10" />
</label>
 
<label>
	<input type="number" value={b} min="0" max="10" />
	<input type="range" value={b} min="0" max="10" />
</label>
 
<p>{a} + {b} = {a + b}</p>