实际上,只有一个操作的页面非常罕见。大多数情况下,你需要在页面上执行多个操作。在这个应用中,创建待办事项是不够的 — 我们已经完成了。
¥A page that only has a single action is, in practice, quite rare. Most of the time you’ll need to have multiple actions on a page. In this app, creating a todo isn’t enough — we’d like to delete them once they’re complete.
首先用名为 create 和 delete 的操作替换我们的 default 操作:
¥Begin by replacing our default action with named create and delete actions:
export const actions = {
create: async ({ cookies, request }) => {
const data = await request.formData();
db.createTodo(cookies.get('userid'), data.get('description'));
},
delete: async ({ cookies, request }) => {
const data = await request.formData();
db.deleteTodo(cookies.get('userid'), data.get('id'));
}
};默认操作不能与命名操作共存。
<form> 元素具有可选的 action 属性,类似于 <a> 元素的 href 属性。更新现有表单以使其指向新的 create 操作:
¥The <form> element has an optional action attribute, which is similar to an <a> element’s href attribute. Update the existing form so that it points to the new create action:
<form method="POST" action="?/create">
<label>
add a todo:
<input
name="description"
autocomplete="off"
/>
</label>
</form>
action属性可以是任何 URL - 如果操作定义在其他页面上,则可能类似于/todos?/create。由于操作位于 _ 本 _ 页面上,我们可以完全省略路径名,因此需要以?字符开头。
接下来,我们要为每个待办事项创建一个表单,并带有一个唯一标识它的隐藏 <input>:
¥Next, we want to create a form for each todo, complete with a hidden <input> that uniquely identifies it:
<ul class="todos">
{#each data.todos as todo (todo.id)}
<li>
<form method="POST" action="?/delete">
<input type="hidden" name="id" value={todo.id} />
<span>{todo.description}</span>
<button aria-label="Mark as complete"></button>
</form>
</li>
{/each}
</ul><script>
let { data } = $props();</script>
<div class="centered">
<h1>todos</h1>
<form method="POST">
<label>
add a todo:
<input
name="description"
autocomplete="off"
/>
</label>
</form>
<ul class="todos">
{#each data.todos as todo (todo.id)}<li>
{todo.description}</li>
{/each}</ul>
</div>
<style>
.centered {max-width: 20em;
margin: 0 auto;
}
label {width: 100%;
}
input {flex: 1;
}
span {flex: 1;
}
button {border: none;
background: url(./remove.svg) no-repeat 50% 50%;
background-size: 1rem 1rem;
cursor: pointer;
height: 100%;
aspect-ratio: 1;
opacity: 0.5;
transition: opacity 0.2s;
}
button:hover {opacity: 1;
}
.saving {opacity: 0.5;
}
</style>