Forms

Handle forms with ease.

Example

<script lang="ts">
  import { Form } from 'kavi/client'
  import { api } from '$lib/kavi/client'
  import z from 'zod'

  const form = Form(api.route, {
    schema: z.object({
      name: z.string(),
      age: z.number().min(18)
    })
  })
</script>

<form onsubmit={form.onsubmit}>
  <input
    name="name"
    aria-invalid={form.errors.name ? true : undefined}
    bind:value={form.fields.name}
  />
  <input
    name="age"
    aria-invalid={form.errors.age ? true : undefined}
    bind:value={form.fields.age}
  />
</form>

Submitting data

Often data in inputs/forms is not exactly what we want to forward to the api. Instead we can use beforeSubmit on the Form options.

Form(api.route, {
  schema: {
    x: z.number(),
    y: z.number()
  },
  beforeSubmit: (fields) => new Vector(x, y)
})

This is identical to

api.route(new Vector(x, y))

Errors

The KaviForm which is returned from Form has the property errors. This is used to check which field errors we have.

To throw your custom errors on the server

import { formError } from 'kavi/client'

middleware.call(() => throw fromError({
  username: "Username is missing"
}))

To throw your custom errors on the client

import { formError } from 'kavi/client'

const form = Form(...)
form.errors = formError({
  username: "Username is missing"
})

Autofocus errors

To autofocus the first error in a form use aria-invalid.