在本博客中，我们将引导您完成使用 angular 作为前端并使用 tailwind css 进行样式创建 url 缩短器应用程序的过程。 url 缩短器是一个方便的工具，可以将长 url 转换为更短、更易于管理的链接。该项目将帮助您了解如何使用现代 web 开发技术构建功能齐全且美观的 web 应用程序。
先决条件
要学习本教程，您应该对 angular 有基本的了解，并对 tailwind css 有一定的了解。确保您的计算机上安装了 node.js 和 angular cli。
项目设置
1. 创建一个新的 angular 项目
首先，通过在终端中运行以下命令来创建一个新的 angular 项目：
ng new url-shortener-app cd url-shortener-app
2. 安装 tailwind css
接下来，在您的 angular 项目中设置 tailwind css。通过 npm 安装 tailwind css 及其依赖项：
npm install -d tailwindcss postcss autoprefixer npx tailwindcss init
通过更新 tailwind.config.js 文件来配置 tailwind css：
module.exports = {
content: [
"./src/**/*.{html,ts}",
],
theme: {
extend: {},
},
plugins: [],
}
将 tailwind 指令添加到您的 src/styles.scss 文件中：
@tailwind base; @tailwind components; @tailwind utilities;
构建 url 缩短器
3. 创建 url 模型
创建 url 模型来定义 url 数据的结构。添加新文件 src/app/models/url.model.ts:
export type urls = url[];
export interface url {
_id: string;
originalurl: string;
shorturl: string;
clicks: number;
expirationdate: string;
createdat: string;
__v: number;
}
4. 设置 url 服务
创建一个服务来处理与 url 缩短相关的 api 调用。添加新文件 src/app/services/url.service.ts:
import { httpclient } from '@angular/common/http';
import { injectable } from '@angular/core';
import { observable } from 'rxjs';
import { url, urls } from '../models/url.model';
import { environment } from '../../environments/environment';
@injectable({
providedin: 'root',
})
export class urlservice {
private apiurl = environment.apiurl;
constructor(private http: httpclient) {}
shortenurl(originalurl: string): observable<url> {
return this.http.post<url>(`${this.apiurl}/shorten`, { originalurl });
}
getallurls(): observable<urls> {
return this.http.get<urls>(`${this.apiurl}/urls`);
}
getdetails(id: string): observable<url> {
return this.http.get<url>(`${this.apiurl}/details/${id}`);
}
deleteurl(id: string): observable<url> {
return this.http.delete<url>(`${this.apiurl}/delete/${id}`);
}
}
5. 创建缩短 url 组件
生成一个用于缩短 url 的新组件：
ng generate component shorten
更新组件的 html (src/app/shorten/shorten.component.html) 如下所示：
<div class="max-w-md mx-auto p-4 shadow-lg rounded-lg mt-4">
<h2 class="text-2xl font-bold mb-2">url shortener</h2>
<form [formgroup]="urlform" (ngsubmit)="shortenurl()">
<div class="flex items-center mb-2">
<input class="flex-1 p-2 border border-gray-300 rounded mr-4" formcontrolname="originalurl"
placeholder="enter your url" required />
<button class="px-4 py-2 bg-blue-500 text-white rounded hover:bg-blue-600" type="submit">
shorten
</button>
</div>
@if (urlform.get('originalurl')?.invalid && (urlform.get('originalurl')?.dirty ||
urlform.get('originalurl')?.touched)) {
<div class="text-red-500" role="alert" aria-live="assertive">
@if (urlform.get('originalurl')?.errors?.['required']) {
url is required.
}
@if (urlform.get('originalurl')?.errors?.['pattern']) {
invalid url format. please enter a valid url starting with http:// or https://.
}
</div>
}
</form>
@if (errormsg) {
<div class="p-4 bg-red-100 rounded mt-4">
<p class="text-red-500">{{ errormsg }}</p>
</div>
}
@if (shorturl) {
<div class="p-4 bg-green-100 rounded">
<p>shortened url: <a class="text-blue-500 hover:text-blue-600" [href]="redirecturl + shorturl"
target="_blank">{{ shorturl }}</a>
<button class="ml-2 px-2 py-1 bg-gray-200 text-gray-800 border border-slate-950 rounded hover:bg-gray-300"
(click)="copyurl(redirecturl + shorturl)">copy</button>
@if (copymessage) {
<span class="text-green ml-2">{{ copymessage }}</span>
}
</p>
</div>
}
</div>
<div class="max-w-md mx-auto mt-4 p-2">
<h2 class="text-2xl font-bold mb-4">all urls</h2>
@if (isloading) {
<div class="max-w-md mx-auto p-4 shadow-lg rounded-lg">
<div class="text-center p-4">
loading...
</div>
</div>
}
@else if (error) {
<div class="max-w-md mx-auto p-4 shadow-lg rounded-lg">
<div class="text-center p-4">
<p class="text-red-500">{{ error }}</p>
</div>
</div>
}
@else {
@if (urls.length > 0 && !isloading && !error) {
<ul>
@for (url of urls; track $index) {
<li class="p-2 border border-gray-300 rounded mb-2">
<div class="flex justify-between items-center">
<div>
url:
<a class="text-blue-500 hover:text-blue-600" [href]="redirecturl + url.shorturl" target="_blank">{{
url.shorturl }}</a>
</div>
<div class="flex justify-between items-center">
<button class="px-2 py-1 bg-blue-200 text-blue-800 rounded hover:bg-blue-300"
(click)="showdetails(url.shorturl)">details</button>
<button class="ml-2 px-2 py-1 bg-gray-200 text-gray-800 rounded hover:bg-gray-300"
(click)="copylisturl(redirecturl + url.shorturl, $index)">{{
copyindex === $index ? 'copied' : 'copy'
}}</button>
<button class="ml-2 px-2 py-1 bg-red-200 text-red-800 rounded hover:bg-red-300"
(click)="preparedelete(url.shorturl)">delete</button>
</div>
</div>
</li>
}
</ul>
}
@else {
<div class="max-w-md mx-auto p-4 shadow-lg rounded-lg">
<div class="text-center p-4">
no urls found.
</div>
</div>
}
}
</div>
@if (showdeletemodal) {
<div class="fixed inset-0 flex items-center justify-center bg-black bg-opacity-50">
<div class="bg-white p-4 rounded shadow-lg">
<h3 class="text-xl font-bold mb-2">confirm deletion</h3>
<p class="mb-4">are you sure you want to delete this url?</p>
<button class="px-4 py-2 bg-red-500 text-white rounded hover:bg-red-600" (click)="confirmdelete()">yes,
delete</button>
<button class="px-4 py-2 bg-gray-300 text-gray-800 rounded hover:bg-gray-400 ml-2"
(click)="showdeletemodal = false">cancel</button>
</div>
</div>
}
@if (showdetailsmodal) {
<div class="fixed inset-0 flex items-center justify-center bg-black bg-opacity-50">
<div class="bg-white p-4 rounded shadow-lg">
<h3 class="text-xl font-bold mb-2">url details</h3>
@if (isloading) {
<p class="mb-4">loading...</p>
}
@else {
<p class="mb-4">short url: <a class="text-blue-500 hover:text-blue-600"
[href]="redirecturl + selectedurl.shorturl" target="_blank">{{ selectedurl.shorturl }}</a></p>
<p class="mb-4">original url: <a class="text-blue-500 hover:text-blue-600" [href]="selectedurl.originalurl"
target="_blank">{{ selectedurl.originalurl }}</a></p>
<p class="mb-4">clicks: <span class="text-green-500">{{ selectedurl.clicks }}</span></p>
<p class="mb-4">created at: {{ selectedurl.createdat | date: 'medium' }}</p>
<p class="mb-4">expires at: {{ selectedurl.expirationdate | date: 'medium' }}</p>
<button class="px-4 py-2 bg-gray-300 text-gray-800 rounded hover:bg-gray-400"
(click)="showdetailsmodal = false">close</button>
}
</div>
</div>
}
6. 向组件添加逻辑
更新组件的 typescript 文件（src/app/shorten/shorten.component.ts）以处理表单提交和 api 交互：
import { component, inject, oninit } from '@angular/core';
import { urlservice } from '../services/url.service';
import {
formcontrol,
formgroup,
reactiveformsmodule,
validators,
} from '@angular/forms';
import { url } from '../models/url.model';
import { environment } from '../../environments/environment';
import { datepipe } from '@angular/common';
import { subject, takeuntil } from 'rxjs';
@component({
selector: 'app-shorten',
standalone: true,
imports: [datepipe, reactiveformsmodule],
templateurl: './shorten.component.html',
styleurl: './shorten.component.scss',
})
export class shortencomponent implements oninit {
shorturl: string = '';
redirecturl = environment.apiurl + '/';
copymessage: string = '';
copylistmessage: string = '';
urls: url[] = [];
showdeletemodal = false;
showdetailsmodal = false;
urltodelete = '';
copyindex: number = -1;
selectedurl: url = {} as url;
isloading = false;
isloading = false;
error: string = '';
errormsg: string = '';
urlform: formgroup = new formgroup({});
private unsubscribe$: subject<void> = new subject<void>();
urlservice = inject(urlservice);
ngoninit() {
this.urlform = new formgroup({
originalurl: new formcontrol('', [
validators.required,
validators.pattern('^(http|https)://.*$'),
]),
});
this.getallurls();
}
shortenurl() {
if (this.urlform.valid) {
this.urlservice.shortenurl(this.urlform.value.originalurl).pipe(takeuntil(this.unsubscribe$)).subscribe({
next: (response) => {
// console.log('shortened url: ', response);
this.shorturl = response.shorturl;
this.getallurls();
},
error: (error) => {
console.error('error shortening url: ', error);
this.errormsg = error?.error?.message || 'an error occurred!';
},
});
}
}
getallurls() {
this.isloading = true;
this.urlservice.getallurls().pipe(takeuntil(this.unsubscribe$)).subscribe({
next: (response) => {
// console.log('all urls: ', response);
this.urls = response;
this.isloading = false;
},
error: (error) => {
console.error('error getting all urls: ', error);
this.isloading = false;
this.error = error?.error?.message || 'an error occurred!';
},
});
}
showdetails(id: string) {
this.showdetailsmodal = true;
this.getdetails(id);
}
getdetails(id: string) {
this.isloading = true;
this.urlservice.getdetails(id).subscribe({
next: (response) => {
// console.log('url details: ', response);
this.selectedurl = response;
this.isloading = false;
},
error: (error) => {
console.error('error getting url details: ', error);
this.error = error?.error?.message || 'an error occurred!';
},
});
}
copyurl(url: string) {
navigator.clipboard
.writetext(url)
.then(() => {
// optional: display a message or perform an action after successful copy
console.log('url copied to clipboard!');
this.copymessage = 'copied!';
settimeout(() => {
this.copymessage = '';
}, 2000);
})
.catch((err) => {
console.error('failed to copy url: ', err);
this.copymessage = 'failed to copy url';
});
}
copylisturl(url: string, index: number) {
navigator.clipboard
.writetext(url)
.then(() => {
// optional: display a message or perform an action after successful copy
console.log('url copied to clipboard!');
this.copylistmessage = 'copied!';
this.copyindex = index;
settimeout(() => {
this.copylistmessage = '';
this.copyindex = -1;
}, 2000);
})
.catch((err) => {
console.error('failed to copy url: ', err);
this.copylistmessage = 'failed to copy url';
});
}
preparedelete(url: string) {
this.urltodelete = url;
this.showdeletemodal = true;
}
confirmdelete() {
// close the modal
this.showdeletemodal = false;
// delete the url
this.deleteurl(this.urltodelete);
}
deleteurl(id: string) {
this.urlservice.deleteurl(id).subscribe({
next: (response) => {
// console.log('deleted url: ', response);
this.getallurls();
},
error: (error) => {
console.error('error deleting url: ', error);
this.error = error?.error?.message || 'an error occurred!';
},
});
}
ngondestroy() {
this.unsubscribe$.next();
this.unsubscribe$.complete();
}
}
7.更新应用程序组件的html文件(src/app/app.component.html)
<router-outlet></router-outlet>
8.更新应用程序配置文件(src/app/app.config.ts)
import { applicationconfig, providezonechangedetection } from '@angular/core';
import { providerouter } from '@angular/router';
import { routes } from './app.routes';
import { providehttpclient } from '@angular/common/http';
export const appconfig: applicationconfig = {
providers: [
providezonechangedetection({ eventcoalescing: true }),
providerouter(routes),
providehttpclient(),
],
};
9.更新应用程序路由文件（src/app/app.routes.ts）
import { Routes } from '@angular/router';
export const routes: Routes = [
{
path: '',
loadComponent: () =>
import('./shorten/shorten.component').then((m) => m.ShortenComponent),
},
];
结论
您已经使用 angular 和 tailwind css 成功构建了 url 缩短器应用程序。该项目演示了如何集成现代前端技术来创建功能强大且时尚的 web 应用程序。借助 angular 的强大功能和 tailwind css 实用程序优先的方法，您可以轻松构建响应灵敏且高效的 web 应用程序。
请随意通过添加用户身份验证等功能来扩展此应用程序。祝您编码愉快！
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