angular-todomvc

使用脚手架新建一个angular项目

cnpm new todo-ng
cd todo-ng
ng serve
// cnpm start

下载模板文件

git clone https://github.com/tastejs/todomvc-app-template.git --depth 1

如果不想下载的话，我已经把模板文件拷贝在这里（index.html）

<!doctype html>
<html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><title>Template • TodoMVC</title><link rel="stylesheet" href="node_modules/todomvc-common/base.css"><link rel="stylesheet" href="node_modules/todomvc-app-css/index.css"><!-- CSS overrides - remove if you don't need it --><link rel="stylesheet" href="css/app.css"></head><body><section class="todoapp"><header class="header"><h1>todos</h1><input class="new-todo" placeholder="What needs to be done?" autofocus></header><!-- This section should be hidden by default and shown when there are todos --><section class="main"><input id="toggle-all" class="toggle-all" type="checkbox"><label for="toggle-all">Mark all as complete</label><ul class="todo-list"><!-- These are here just to show the structure of the list items --><!-- List items should get the class `editing` when editing and `completed` when marked as completed --><li class="completed"><div class="view"><input class="toggle" type="checkbox" checked><label>Taste JavaScript</label><button class="destroy"></button></div><input class="edit" value="Create a TodoMVC template"></li><li><div class="view"><input class="toggle" type="checkbox"><label>Buy a unicorn</label><button class="destroy"></button></div><input class="edit" value="Rule the web"></li></ul></section><!-- This footer should hidden by default and shown when there are todos --><footer class="footer"><!-- This should be `0 items left` by default --><span class="todo-count"><strong>0</strong> item left</span><!-- Remove this if you don't implement routing --><ul class="filters"><li><a class="selected" href="#/">All</a></li><li><a href="#/active">Active</a></li><li><a href="#/completed">Completed</a></li></ul><!-- Hidden if no completed items are left ↓ --><button class="clear-completed">Clear completed</button></footer></section><footer class="info"><p>Double-click to edit a todo</p><!-- Remove the below line ↓ --><p>Template by <a href="http://sindresorhus.com">Sindre Sorhus</a></p><!-- Change this out with your name and url ↓ --><p>Created by <a href="http://todomvc.com">you</a></p><p>Part of <a href="http://todomvc.com">TodoMVC</a></p></footer><!-- Scripts here. Don't remove ↓ --><script src="node_modules/todomvc-common/base.js"></script><script src="js/app.js"></script></body>
</html>

当然你也可以选择自己写…

移植栽培

将下载模板的html代码移植到我们的项目中（app文件夹下的app.component.html）

<section class="todoapp"><header class="header"><h1>todos</h1><input class="new-todo" placeholder="What needs to be done?" autofocus></header><!-- This section should be hidden by default and shown when there are todos --><section class="main"><input id="toggle-all" class="toggle-all" type="checkbox"><label for="toggle-all">Mark all as complete</label><ul class="todo-list"><!-- These are here just to show the structure of the list items --><!-- List items should get the class `editing` when editing and `completed` when marked as completed --><li class="completed"><div class="view"><input class="toggle" type="checkbox" checked><label>Taste JavaScript</label><button class="destroy"></button></div><input class="edit" value="Create a TodoMVC template"></li><li><div class="view"><input class="toggle" type="checkbox"><label>Buy a unicorn</label><button class="destroy"></button></div><input class="edit" value="Rule the web"></li></ul></section><!-- This footer should hidden by default and shown when there are todos --><footer class="footer"><!-- This should be `0 items left` by default --><span class="todo-count"><strong>0</strong> item left</span><!-- Remove this if you don't implement routing --><ul class="filters"><li><a class="selected" href="#/">All</a></li><li><a href="#/active">Active</a></li><li><a href="#/completed">Completed</a></li></ul><!-- Hidden if no completed items are left ↓ --><button class="clear-completed">Clear completed</button></footer>
</section>
<footer class="info"><p>Double-click to edit a todo</p><!-- Remove the below line ↓ --><p>Template by <a href="http://sindresorhus.com">Sindre Sorhus</a></p><!-- Change this out with your name and url ↓ --><p>Created by <a href="http://todomvc.com">you</a></p><p>Part of <a href="http://todomvc.com">TodoMVC</a></p>
</footer>

接下来将我们的样式下载并导入进去（我这里使用less：styles.less）

cnpm i todomvc-common todomvc-app-css

/* You can add global styles to this file, and also import other style files */
@import url('todomvc-common/base.css');
@import url('todomvc-app-css/index.css');

实现项目逻辑

模拟数据使用ngFor渲染到界面测试一下（数据列表展示–有数据）

遍历一个对象数组(app.component.ts定义一个对象数组)

import { Component } from '@angular/core';
const todos = [{id:1,skill:'vue',bool: true},{id:2,skill:'react',bool: true},{id:3,skill:'angular',bool: true}
]
@Component({selector: 'app-root',templateUrl: './app.component.html',styleUrls: ['./app.component.less']
})
export class AppComponent {public todos:{id:number,skill:string,bool:boolean}[] = todos
}

app.component.html的每个li是一个项（使用*ngFor进行循环数组）

<!-- These are here just to show the structure of the list items -->

...<ul class="todo-list"><li *ngFor="let todo of todos"><div class="view"><input class="toggle" type="checkbox" checked><label>{{todo.skill}}</label><button class="destroy"></button></div><input class="edit" value="Create a TodoMVC template"></li></ul>
...

不同的类状态不同

<!-- List items should get the class `editing` when editing and `completed` when marked as completed -->
completed:该类是完成状态
editing:该类是编辑状态
没有添加任何类：正常状态

隐藏我们的内容（数据列表展示–无数据）

有数据我们展示，没有数据我们将内容隐藏掉；
使用*ngIf条件渲染；使用ng-template避免产生额外的标签
测试一下

export class AppComponent {public todos:{id:number,skill:string,bool:boolean}[] = []
}

添加任务

在文本框输入文字回车后将该条数据添加到列表中
使用()绑定事件

<input class="new-todo" placeholder="What needs to be done?" autofocus (keyup.enter)='addTodo($event)'>

处理业务逻辑

export class AppComponent {...addTodo(e):void {const inpVal = e.target.valueif(!inpVal.length){return;}let id = this.todos[this.todos.length-1].id+1this.todos.push({id,skill:inpVal,bool:false})e.target.value = ''console.log(todos)}
}

点击选择按钮切换完成和正常状态
实现数据双向绑定，根据bool的值来给其是否添加completed（表示以完成）该类

      <li *ngFor="let todo of todos" [ngClass]='{completed:todo.bool}'><div class="view"><input class="toggle" type="checkbox" [(ngModel)]="todo.bool"><label>{{todo.skill}}</label><button class="destroy"></button></div><input class="edit" value="Create a TodoMVC template"></li>

我们需要配置双向绑定（app.module.ts）

...
import { FormsModule } from '@angular/forms';
...imports: [BrowserModule,AppRoutingModule,FormsModule],
...

实现`#toggle-all`选择框的全选与反选

当所有的todo，每一条都是已完成（即bool:true）时，那么checkbox(即左上角的小图标高亮显示)

  get toggleAll () {return this.todos.every(t => t.bool)}

<input id="toggle-all" class="toggle-all" type="checkbox" [checked]="toggleAll">

点击该选择按钮时，当该按钮为true，每一条todo都需要选中，反之亦然…

<input id="toggle-all" class="toggle-all" type="checkbox" [checked]="toggleAll" (change)="toggleAll=$event.target.checked">

  set toggleAll(val:boolean) {console.log(val)this.todos.forEach(t=>t.bool=val)}

删除单个todo

可以根据id删除，也可以根据索引值删除；使用splice或则filter进行删除都可以，我们高档一点，使用filter+索引值

      <li *ngFor="let todo of todos; let i = index;" [ngClass]='{completed:todo.bool}'><div class="view"><input class="toggle" type="checkbox" [(ngModel)]="todo.bool"><label>{{todo.skill}}</label><button class="destroy" (click)='removeTodo(i)'></button></div><input class="edit" value="Create a TodoMVC template"></li>

  removeTodo(index){this.todos = this.todos.filter((t,i)=>{if(i==index){return false}return true})}

编辑功能

定义该条编辑项

...public currentEditing: {id: number,skill: string,done: boolean} = null
...

双击可以编辑该条todo
离开不选中

      <li *ngFor="let todo of todos; let i = index;" [ngClass]='{completed:todo.bool,editing: currentEditing === todo}'><div class="view"><input class="toggle" type="checkbox" [(ngModel)]="todo.bool"><label (dblclick)='currentEditing = todo'>{{todo.skill}}</label><button class="destroy" (click)='removeTodo(i)'></button></div><input class="edit" [value]="todo.skill" (blur)="saveEdit(todo)"></li>

  saveEdit(t){this.currentEditing = null}

保存编辑

        <input class="edit" [value]="todo.skill" (keyup.enter)="saveEdit(todo, $event)"(blur)="saveEdit(todo,$event)">

  saveEdit(t,e){t.skill = e.target.valuethis.currentEditing = null}

取消编辑

...(keyup)="handleEditKeyUp($event)"...
...handleEditKeyUp(e){const {keyCode,target} = eif (keyCode === 27) {// 取消编辑target.value = this.currentEditing.skillthis.currentEditing = null}}

item lift

<span class="todo-count"><strong>{{remaningCount}}</strong> item left</span>

  get remaningCount (){return this.todos.filter(t=>!t.bool).length}

切换按钮（All、Active、Completed）

<ul class="todo-list"><li *ngFor="let todo of filterTodos; let i = index;" [ngClass]='{completed:todo.bool,editing: currentEditing === todo}'>...<ul class="filters"><li><a [ngClass]="{selected:'all'===visibility}" href="#/">All</a></li><li><a [ngClass]="{selected: visibility === 'active'}" href="#/active">Active</a></li><li><a [ngClass]="{selected: visibility === 'completed'}" href="#/completed">Completed</a></li></ul>

 public visibility: string = 'all'hashchangeHandler () {// 当用户点击了锚点的时候，我们需要获取当前的锚点标识// 然后动态的将根组件中的 visibility 设置为当前点击的锚点标识const hash = window.location.hash.substr(1)switch (hash) {case '/':this.visibility = 'all'break;case '/active':this.visibility = 'active'break;case '/completed':this.visibility = 'completed'break;}}get filterTodos () {if (this.visibility === 'all') {return this.todos} else if (this.visibility === 'active') {return this.todos.filter(t => !t.bool)} else if (this.visibility === 'completed') {return this.todos.filter(t => t.bool)}}ngOnInit () {// 初始化的时候手动调用一次this.hashchangeHandler()// 注意：这里要 bind this绑定window.onhashchange = this.hashchangeHandler.bind(this)}

数据持久化

export class AppComponent {public todos:{id:number,skill:string,bool:boolean}[] = JSON.parse(localStorage.getItem('todos') || '[]')
...public visibility: string = 'all'ngDoCheck() {window.localStorage.setItem('todos', JSON.stringify(this.todos))}
}

参考文档

angular 命令

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angular-todomvc

使用脚手架新建一个angular项目

下载模板文件

移植栽培

实现项目逻辑

模拟数据使用ngFor渲染到界面测试一下（数据列表展示–有数据）

隐藏我们的内容（数据列表展示–无数据）

添加任务

实现`#toggle-all`选择框的全选与反选

删除单个todo

编辑功能

item lift

切换按钮（All、Active、Completed）

数据持久化

参考文档

angular-todomvc相关推荐

最新文章

热门文章

angular-todomvc

使用脚手架新建一个angular项目

下载模板文件

移植栽培

实现项目逻辑

模拟数据使用ngFor渲染到界面测试一下（数据列表展示–有数据）

隐藏我们的内容（数据列表展示–无数据）

添加任务

实现#toggle-all选择框的全选与反选

删除单个todo

编辑功能

item lift

切换按钮（All、Active、Completed）

数据持久化

参考文档

angular-todomvc相关推荐

最新文章

热门文章

实现`#toggle-all`选择框的全选与反选