原文链接

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上一篇【Next.js 项目实战系列】03-查看 Issue

修改 Issue

添加修改 Button​

本节代码链接

安装 Radix UI 的 Radix Ui Icons

npm i @radix-ui/react-icons

# /app/issues/[id]/page.tsx...const IssueDeatilPage = async ({ params }: Props) => {...return (// 添加一个 Grid 以分列显示，设置 initial 为 1，在移动设备为每页 1 栏，平板以上则 2 栏<Grid columns={{ initial: "1", md: "2" }} gap="5"><Box><Heading as="h2">{issue.title}</Heading>...</Box>{/*添加一个 Button 用于编辑*/}
+       <Box>
+         <Button>
+           <Pencil2Icon />
+           <Link href={`/issues/${issue.id}/edit`}>Edit Issue</Link>
+         </Button>
+       </Box></Grid>);};export default IssueDeatilPage;

Single Responsbility Principle​

本节代码链接

Software entities should have a single responsibility

重构 /app/issues/[id]/page.tsx 以应用 SRP

• page.tsx
• IssueDetails.tsx
• EditIssueButton.tsx

# /app/issues/[id]/page.tsximport prisma from "@/prisma/client";
import { Box, Grid } from "@radix-ui/themes";
import { notFound } from "next/navigation";
import EditIssueButton from "./EditIssueButton";
import IssueDetails from "./IssueDetails";interface Props {params: { id: string };
}
const IssueDeatilPage = async ({ params }: Props) => {const issue = await prisma.issue.findUnique({where: { id: parseInt(params.id) },});if (!issue) notFound();return (<Grid columns={{ initial: "1", md: "2" }} gap="5"><Box><IssueDetails issue={issue} /></Box><Box><EditIssueButton issueId={issue.id} /></Box></Grid>);
};
export default IssueDeatilPage;

# /app/issues/[id]/IssueDetails.tsximport { IssueStatusBadge } from "@/app/components";
import { Issue } from "@prisma/client";
import { Card, Flex, Heading, Text } from "@radix-ui/themes";
import ReactMarkdown from "react-markdown";const IssueDetails = ({ issue }: { issue: Issue }) => {return (<><Heading as="h2">{issue.title}</Heading><Flex gap="3" my="5"><IssueStatusBadge status={issue.status}></IssueStatusBadge><Text>{issue.createdAt.toDateString()}</Text></Flex><Card className="prose"><ReactMarkdown>{issue.description}</ReactMarkdown></Card></>);
};
export default IssueDetails;

# /app/issues/[id]/EditIssueButton.tsximport { Pencil2Icon } from "@radix-ui/react-icons";
import { Button } from "@radix-ui/themes";
import Link from "next/link";const EditIssueButton = ({ issueId }: { issueId: number }) => {return (<Button><Pencil2Icon /><Link href={`/issues/${issueId}/edit`}>Edit Issue</Link></Button>);
};
export default EditIssueButton;

修改 Issue​

页面​

本节代码链接

我们可以像这样构建文件结构，在 Issue 目录下创建 _components 以放置该目录下需要重复使用的组件，文件夹名前添加下划线就可以把这个文件夹从路由中移除

└─issues│  IssueActions.tsx│  loading.tsx│  page.tsx│├─new│      loading.tsx│      page.tsx│├─[id]│  │  EditIssueButton.tsx│  │  IssueDetails.tsx│  │  loading.tsx│  │  page.tsx│  ││  └─Edit│          page.tsx│└─_componentsIssueForm.tsx

将之前的 new/page.tsx 封装为一个组件，并添加一个可选参数，以初始化

# /app/issues/_components/IssueForm.tsx...
+ import { Issue } from "@prisma/client";...// 添加一个可选参数 issue 类型为之前 prisma 中的 Issue
- const IssueForm = () => {
+ const IssueForm = ({ issue }: { issue?: Issue }) => {...return (<div className="max-w-xl prose">...<TextField.Root><TextField.Input// 将该字段初始化为 issue.title (若传入 issue)
+             defaultValue={issue?.title}placeholder="Title"{...register("title")}/></TextField.Root><ErrorMessage>{errors.title?.message}</ErrorMessage><Controller// 将该字段初始化为 issue.description (若传入 issue)
+           defaultValue={issue?.description}name="description"control={control}render={({ field }) => (<SimpleMDE placeholder="Description" {...field} />)}/>...</div>);};export default IssueForm;

API​

本节代码链接

# /app/api/issues/[id]/route.tsximport { issueSchema } from "@/app/validationSchema";
import { NextRequest, NextResponse } from "next/server";
import prisma from "@/prisma/client";export async function PATCH(request: NextRequest,{ params }: { params: { id: string } }
) {const body = await request.json();const validation = issueSchema.safeParse(body);if (!validation.success)return NextResponse.json(validation.error.format(), { status: 400 });const issue = await prisma.issue.findUnique({where: { id: parseInt(params.id) },});if (!issue)return NextResponse.json({ error: "Invalid Issue" }, { status: 404 });const updatedIssue = await prisma.issue.update({where: { id: issue.id },data: { title: body.title, description: body.description },});return NextResponse.json(updatedIssue, { status: 200 });
}

连接​

本节代码链接

# /app/issues/_components/IssueForm.tsxconst IssueForm = ({ issue }: { issue?: Issue }) => {...return (...<formclassName="space-y-3"onSubmit={handleSubmit(async (data) => {try {setSubmitting(true);// 判断是否传入了 issue，若有传入则是 Update，若无则是 new
+           if (issue) await axios.patch("/api/issues/" + issue.id, data);
-           await axios.post("/api/issues", data);
+           else await axios.post("/api/issues", data);router.push("/issues");} ...})}>...<Button disabled={isSubmitting}>
+         {issue ? "Update Issue" : "Submit New Issue"}{" "}{isSubmitting && <Spinner />}</Button></form>...);};export default IssueForm;

Caching​

本节代码链接

NextJS Route Segment Config

• Data Cache:
  • When we fetch data using fetch()
  • Stored in the file system
  • Permanent unitl we redeploy
  • fetch(".",{cache: "no-store"})
  • fetch(".",{revalidata: 3600})
• Full Route Cache
  • Used to store the output of statically renderd routes
• Router Cache (Client-side Cache)
  • To store the payload of pages in browser
  • Lasts for a session
  • Gets refreshed when we reload

提升 Loading 体验​

本节代码链接

由于我们要在多个地方用到 IssueForm 的 Skeleton，我们可以将其封装到一个组件里，然后在需要的地方调用。其次，对于静态的页面可以直接使用 loading.tsx，但是对于需要用到 dynamic 函数的页面，应该用另一种方法

• IssueFormSkeleton.tsx
• page.tsx
• loading.tsx

# /app/issues/_components/IssueFormSkeleton.tsximport { Skeleton } from "@/app/components";
import { Box } from "@radix-ui/themes";const IssueFormSkeleton = () => {return (<Box className="max-w-xl"><Skeleton height="2rem" /><Skeleton height="20rem" /></Box>);
};
export default IssueFormSkeleton;

# /app/issues/[id]/edit/page.tsximport prisma from "@/prisma/client";
import dynamic from "next/dynamic";
import { notFound } from "next/navigation";
import IssueFormSkeleton from "./loading";const IssueForm = dynamic(() => import("@/app/issues/_components/IssueForm"), {ssr: false,loading: () => <IssueFormSkeleton />,
});interface Props {params: { id: string };
}const EditIssuePage = async ({ params }: Props) => {const issue = await prisma.issue.findUnique({where: { id: parseInt(params.id) },});if (!issue) notFound();return <IssueForm issue={issue} />;
};
export default EditIssuePage;

# /app/issues/[id]/edit/loading.tsximport IssueFormSkeleton from "@/app/issues/_components/IssueFormSkeleton";
export default IssueFormSkeleton;

CSDN 的排版/样式可能有问题，去我的博客查看原文系列吧，觉得有用的话，给我的库点个star，关注一下吧  

下一篇讲删除 Issue

下一篇【Next.js 项目实战系列】05-删除 Issue