Angularv4.初体验


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23 视频条目模型 Video Item Model

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前面我们跟video相关的变量都是用的any类型,这个不够准确,我们这节把它映射到video对象。

参考json数据内的内容,我们设定模型VideoItem如下

src/app/videos/video.ts

export class VideoItem {
     slug: string;
     name: string;
     image?: string;
     embed?: string;
     featured?: Boolean;
 }

?表示这个字段是可选的

Json格式
src/assets/json/videos.json

    "name": "Item 2",
     "slug": "item-2",
     "embed": "1hyjLD7pk10",
     "image": "assets/images/nature/5.jpg",
     "featured": false  

我们接下来分别修改各个模块里的video字段

Video-list / video-detail / search-detail 的修改比较类似,导入这个模型,替换any类型就可以了
src/app/video-list/video-list.component.ts

import { VideoItem } from '../videos/video';
    //videoList: [any];
    videoList: [VideoItem];

  ngOnInit() {
     // this.todayDate = new Date()
     this.req = this._video.list().subscribe(data=>{
       //this.videoList = data as [any];
       this.videoList = data as [VideoItem];    

src/app/video-detail/video-detail.component.ts

import { VideoItem } from '../videos/video';
export class VideoDetailComponent implements OnInit, OnDestroy {
     //video: any;
     video: VideoItem;

  ngOnInit() {
       this.routeSub = this.route.params.subscribe(params => {
           this.slug = params['slug']
           this.req = this._video.get(this.slug).subscribe(data=>{
             //this.video = data
             this.video = data as VideoItem

src/app/search-detail/search-detail.component.ts

import { VideoItem } from '../videos/video';

   //videoList: [any]; 
   videoList: [VideoItem]; 

export class SearchDetailComponent implements OnInit, OnDestroy {
      this.routeSub = this.route.params.subscribe(params=>{
           this.query = params['q']
            this.req = this._video.search(this.query).subscribe(data=>{
               //this.videoList = data as [any];  
               this.videoList = data as [VideoItem]; 
             })
       })      

主页的修改稍微有一些变化,除了和前面一样把list的类型改为VideoItem之外,顺便引入了service功能
用到了filter

src/app/home/home.component.ts

import { VideoItem } from '../videos/video';
import { VideoService } from '../videos/videos.service';

@Component({

   providers: [VideoService]
 })

export class HomeComponent implements OnInit, OnDestroy {
    //homeImageList = [ 
         // {image: "assets/images/nature/4.jpg", name:"Image 4", slug:'video-1'},
         // {image: "assets/images/nature/5.jpg", name:"Image 5", link:'video-1'},
         // {image: "assets/images/nature/6.jpg", name:"Image 6", link:'video-1'}
    //]
    homeImageList:[VideoItem] = [] as [VideoItem]
    constructor(private http:Http, private router:Router, private _video:VideoService) { } 

  ngOnInit() {
       //this.req = this.http.get('assets/json/videos.json').subscribe(data=>{
       this.req = this._video.list().subscribe(data=>{
           //console.log(data.json())
           data.json().filter(item=>{ 
           data.filter(item=>{
               if(item.featured){
                   //this.homeImageList.push(item)
                   let dataItem = item 
                   this.homeImageList.push(dataItem) 
               }
           })

视频上额外做了一步赋值,不知道为什么

修改Item2的featured为true,这样它也能显示在主页上。

src/assets/json/videos.json

    "name": "Item 2",
     "slug": "item-2",
     "embed": "1hyjLD7pk10",
     "image": "assets/images/nature/5.jpg",
     #"featured": false  
     "featured": true