ngFor ngForOf指令通常使用缩写形式*ngFor为集合中的每个项呈现模板的结构指令.该指令放置在元素上,该元素将成为克隆模板的父级. <li *ngFor="let item of items; index as i; trackBy: trackByFn">...</li> 一般使用是: const list = [{age: '16'}, {age: '18'}, {age: '15'}] <li *ngFor="let item…

Angular 4.x 快速入门 Angular 4 快速入门 涉及 Angular 简介.环境搭建.插件表达式.自定义组件.表单模块.Http 模块等 Angular 4 基础教程 涉及 Angular CLI 使用.创建组件.事件.自定义服务. ngFor 指令.Input.Output 装饰器等 Angular 4 指令快速入门 涉及如何创建指令.定义输入属性.事件处理.如何获取宿主元素属性值.如何创建结构指令等 Angular 4 表单快速入门 涉及如何创建表单.表单验证.表单控件状态.…

前言: 首先为什么要写这样的一篇文章呢?主要是因为前段时间写过一些关于Angualr的相关实战文章,有些爱学习的小伙伴对这方面比较感兴趣,但是又不知道该怎么入手(因为认识我的大多数小伙伴都是后端的同学),所以今天准备出一篇Angular学习资料汇总和日常开发中使用比较频繁的语法.让更多的后端程序员更好的了解学习Angualr,拓展自己的技术栈. Angular简介: Angular 是一个应用设计框架与开发平台,用于创建高效.复杂.精致的单页面应用. 学习资料推荐: Angular-GitHub…

In previous artical, we introduce the how to use *ngFor. The limitation for previous solution to display all the heros is we hard cord all heros in our heroes component. First, in real world app, we cannot hard cord;  Seond, even we don't hard code,…

heros.ts: import {Component} from "@angular/core"; const HEROES = [ {id: 1, name:'Superman'}, {id: 2, name:'Batman'}, {id: 5, name:'BatGirl'}, {id: 3, name:'Robin'}, {id: 4, name:'Flash'} ]; @Component({ selector:'heroes', styleUrls: [ 'heroes.c…

在Angular的模板中遍历一个集合(collection)的时候你会这样写: <ul> <li *ngFor="let item of collection">{{item.id}}</li> </ul> 有时你会需要改变这个集合,比如从后端接口返回了新的数据.那么问题来了,Angular不知道怎么跟踪这个集合里面的项,不知道哪些该添加哪些该修改哪些该删除.结果就是,Angular会把该集合里的项全部移除然后重新添加.就像这样: 这样做…

This lesson covers Angular 2’s version of looping through data in your templates: ng-for. It’s conceptually the same as Angular 1’s ng-repeat, but you’ll find the syntax quite different as it aligns with #refs in Angular 2 and JavaScript “for of” loo…

In this post, we are going to create our own structure directive *ngFor. What it should looks like in HTML? <div> <ul> <li *myFor="let item of items; let i = index;"> {{ i }} Member: {{ item.name | json }} </li> <templ…

<!--The content below is only a placeholder and can be replaced.--> <div style="text-align:center"> <h1> Welcome to {{ title }} </h1> <h1>循环数据 显示数据的索引(key)</h1> <ul> <li *ngFor="let item of list;…

You can use Select and Option elements in combination with ng-for and ng-model to create mini-forms that change your data as you make a selection. /** * Created by wanzhen on 23.10.2015. */ import {Component, View, NgFor, FORM_DIRECTIVES} from 'angul…