SvelteKit：“筛选”不是一个具有“订阅”方法的存储

Question

我正在尝试编写一个Pokedex SvelteKit应用程序(作为James快速版的教程)。当我保存我的index.svelte文件时，它写的是这个问题标题中的错误。

我的index.svelte代码如下：

<script>
    import Nav from '../components/nav.svelte'
    import {pokemon} from '../stores/pokestore'
    import PokemanCard from "../components/pokemanCard.svelte"

    let searchTerm = "";
    let filtered = [];

    $: { // Reacts to any data that changes ($: {what will happen when data changes})
        if (searchTerm !== pokemon.searchTerm) {
            searchTerm = pokemon.searchTerm;
            filtered = filtered(pokemon.pokemons, searchTerm);
        }
    }
</script>

<svelte:head>
    <title>Svelte Kit Pokedex</title>
</svelte:head>

<!-- All HTML Work -->
<h1 class="text-4xl text-center m-8 uppercase">SvelteKit Pokedex</h1>
<input type="text" class="w-full rounded-md text-lg p-4 border-2 border-gray-200" placeholder="Search Pokemon" bind:value={searchTerm}>


<style>
</style>


<div class="py-4 grid gap-4 md:grid-cols-2 grid-cols-1">
    {#each $filtered as pokeman}
    <PokemanCard pokeman={pokeman} />
    {/each}
</div>

我该怎么解决这个问题？

谢谢:)

Answer 1

filtered只是一个数组，而不是一个svelte存储(或者公开一个subsribe()方法的实体)，所以您不能使用$速记来订阅它。只需将其作为数组迭代(不使用$)即可。

{#each filtered as pokeman}
  ...
{/each}

但是pokemon是一家商店吗？如果是这样的话，您需要在反应性语句中订阅它来查看更改。

<script>
    import Nav from '../components/nav.svelte'
    import {pokemon} from '../stores/pokestore'
    import PokemanCard from "../components/pokemanCard.svelte"

    let searchTerm = "";
    let filtered = [];

    $: if (searchTerm !== $pokemon.searchTerm) {
         searchTerm = $pokemon.searchTerm;
         filtered = filtered($pokemon.pokemons, searchTerm); 
         // *Note: I'm not sure where this 'filtered()' method is coming from but it will conflict with your `filtered` array variable.
       }
 
</script>

<svelte:head>
    <title>Svelte Kit Pokedex</title>
</svelte:head>

<!-- All HTML Work -->
<h1 class="text-4xl text-center m-8 uppercase">SvelteKit Pokedex</h1>
<input type="text" class="w-full rounded-md text-lg p-4 border-2 border-gray-200" placeholder="Search Pokemon" bind:value={searchTerm}>


<style>
</style>


<div class="py-4 grid gap-4 md:grid-cols-2 grid-cols-1">
    {#each filtered as pokeman}
    <PokemanCard pokeman={pokeman} />
    {/each}
</div>

或者，您可以为您的svelte派生存储集合使用filtered，在这种情况下，您可以使用$速记来迭代它。

<script>
    import { derived } from 'svelte/store';
    import { pokemon } from './stores.js';

    const filtered = derived(
        pokemon,
        $pokemon => $pokemon.pokemons.filter(p => /* your filter logic */ )
    );
</script>

<div class="py-4 grid gap-4 md:grid-cols-2 grid-cols-1">
    {#each $filtered as pokeman}
    <PokemanCard pokeman={pokeman} />
    {/each}
</div>