We can also use bind:value
with <select>
elements:
App
<select
bind:value={selected}
onchange={() => answer = ''}
>
Note that the <option>
values are objects rather than strings. Svelte doesn’t mind.
Because we haven’t set an initial value of
selected
, the binding will set it to the default value (the first in the list) automatically. Be careful though — until the binding is initialised,selected
remains undefined, so we can’t blindly reference e.g.selected.id
in the template.
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<script>
let questions = $state([
{
id: 1,
text: `Where did you go to school?`
},
{
id: 2,
text: `What is your mother's name?`
},
{
id: 3,
text: `What is another personal fact that an attacker could easily find with Google?`
}
]);
let selected = $state();
let answer = $state('');
function handleSubmit(e) {
e.preventDefault();
alert(
`answered question ${selected.id} (${selected.text}) with "${answer}"`
);
}
</script>
<h2>Insecurity questions</h2>
<form onsubmit={handleSubmit}>
<select
value={selected}
onchange={() => (answer = '')}
>
{#each questions as question}
<option value={question}>
{question.text}
</option>
{/each}
</select>
<input bind:value={answer} />
<button disabled={!answer} type="submit">
Submit
</button>
</form>
<p>
selected question {selected
? selected.id
: '[waiting...]'}
</p>