角度4与ngx无限滚动

Question

我想在我的Angular 4项目中添加一个带有ngx-infinite-scroll的无限滚动.

阵列数据有大约800个来自API的帖子.

最初,我想显示20个帖子,每次滚动页面时,都会显示20个帖子.

目前,每当我向下滚动时,我都可以看到控制台日志消息(滚动!).

但是当我滚动它时,我无法弄清楚如何将20个帖子附加到表中.

这是我正在尝试的代码.

onScrollDown函数

onScrollDown(){        
  this.dataService.getPosts().subscribe((posts)=>{
      for (let post of posts){
       let data = '<tr><td>'+ post.title +'</td><td>'+ post.geo +'</td><td>'+ post.Telephone +'</td><td>'+ post.category +'</td><td>Detail</td></tr>';
       $('table.feed tbody').append(data);
      }
});

---

.

这是组件代码.
posts.component.html

    <div *ngIf="posts?.length > 0;else noPosts" class="search-results" infinite-scroll [infiniteScrollDistance]="2" [infiniteScrollUpDistance]="2" [infiniteScrollThrottle]="50" (scrolled)="onScrollDown()" [scrollWindow]="false">
        <table class="responsive-table feed striped">
            <thead>
                <tr>
                    <th>Name</th>
                    <th>State/City</th>
                    <th>Phone</th>
                    <th>Category</th>
                    <th></th>
                </tr>
            </thead>
            <tbody>
                <tr *ngFor="let post of posts | filter:term">
                    <td>{{post.title}}</td>
                    <td>{{post.geo}}</td>
                    <td>{{post.Telephone}}</td>
                    <td>{{post.category}}</td>
                    <td>Detail</td>
                </tr>
            </tbody>
        </table>
    </div>

---

posts.component.ts

    import { Component, OnInit } from '@angular/core';
    import { DataService } from '../../services/data.service';
    import { FilterPipe } from '../../filter.pipe';
    declare var jquery:any;
    declare var $ :any;

    @Component({
      selector: 'feed',
      templateUrl: './feed.component.html',
      styleUrls: ['./feed.component.css']
    })

    export class FeedComponent implements OnInit {

    term : '';
    posts: Post[];

      constructor(private dataService: DataService) { }

      ngOnInit() {
          this.dataService.getPosts().subscribe((posts)=>{
              this.posts = posts.slice(0,10);
          });
      }

    onScrollDown(){     
         console.log("scrolled!");   
    }

    interface Post{
        id:number, 
        title:string,
        contact:string,
        Address:string,
        Telephone:number,
        Email:string, 
        Website:string, 
        Establishment:string,
        sector:string,
        category:string,
    }

Answer 1

首先,像这样保存您的原始数组

 this.dataService.getPosts().subscribe((response)=>{                  
               this.originalPosts = response;
               this.posts = response.slice(0,20);
          });

 onScrollDown(){
   if(this.posts.length < this.originalPosts.length){  
     let len = this.posts.length;

     for(i = len; i <= len+20; i++){
       this.posts.push(this.originalPosts[i]);
     }
   }
 }

只需将它推到同一个数组上,你就不需要将它直接附加到表中,angular会自行管理,使用angular时太容易了.