在客户端组件中设置react-hook-form中的默认值的最佳方法是什么？

Question

本示例来自shedcn select。在我的应用程序中，我将默认值存储在数据库中并且需要预取它。我应该如何正确地做到这一点？有一个选项可以异步预取默认值，但这似乎不适用于我的情况。

https://ui.shadcn.com/docs/components/select#form

"use client"

import Link from "next/link"
import { zodResolver } from "@hookform/resolvers/zod"
import { useForm } from "react-hook-form"
import { z } from "zod"

import { Button } from "@/components/ui/button"
import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select"
import { toast } from "@/components/ui/use-toast"

const FormSchema = z.object({
  email: z
    .string({
      required_error: "Please select an email to display.",
    })
    .email(),
})

export function SelectForm() {
  const form = useForm<z.infer<typeof FormSchema>>({
    resolver: zodResolver(FormSchema),
  })

  function onSubmit(data: z.infer<typeof FormSchema>) {
    toast({
      title: "You submitted the following values:",
      description: (
        <pre className="mt-2 w-[340px] rounded-md bg-slate-950 p-4">
          <code className="text-white">{JSON.stringify(data, null, 2)}</code>
        </pre>
      ),
    })
  }

  return (
    <Form {...form}>
      <form onSubmit={form.handleSubmit(onSubmit)} className="w-2/3 space-y-6">
        <FormField
          control={form.control}
          name="email"
          render={({ field }) => (
            <FormItem>
              <FormLabel>Email</FormLabel>
              <Select onValueChange={field.onChange} defaultValue={field.value}>
                <FormControl>
                  <SelectTrigger>
                    <SelectValue placeholder="Select a verified email to display" />
                  </SelectTrigger>
                </FormControl>
                <SelectContent>
                  <SelectItem value="[email protected]">[email protected]</SelectItem>
                  <SelectItem value="[email protected]">[email protected]</SelectItem>
                  <SelectItem value="[email protected]">[email protected]</SelectItem>
                </SelectContent>
              </Select>
              <FormDescription>
                You can manage email addresses in your{" "}
                <Link href="/examples/forms">email settings</Link>.
              </FormDescription>
              <FormMessage />
            </FormItem>
          )}
        />
        <Button type="submit">Submit</Button>
      </form>
    </Form>
  )
}

Answer 1

解决方案非常简单。您可以在

defaultValues

中使用异步来获取，也可以在 useEffect 中获取，然后调用

form.reset(data)

。但您需要将

value={form.value}

添加到

Select

组件。

<Select onValueChange={field.onChange} defaultValue={field.value} value={form.value}>