如何在角度2中基于按钮单击来移动div滚动位置 [英] how to move div scroll position based on button click in angular 2

问题描述

我有一个带有水平滚动的div元素和两个按钮，分别是Next和Previous.在这些按钮的基础上，单击我要移动滚动条".

in app.component.html file i have one div element with horizontal scroll and two buttons as Next and Previous. based on these button click i want to move scroll.

app.component.html

<div id="th-infinite-scroll-tracker" style="overflow-y:scroll; height: 200px;" scrollTracker (scroll)="onScroll($event)" (mouseup)="searchLog($event)">
        <div *ngFor="let log of arr; let i = index" innerHTML="{{log}}" [id]="i"></div>
</div>
<button (click)="onPreviousSearchPosition()" [disabled]="disablePreviousBtn">Previous</button>
<button (click)="onNextSearchPosition()" [disabled]="disableNextBtn">Next</button>

app.component.ts

@HostListener('scroll', ['$event'])
onScroll(event){
    this.scrollObject = event;
}
onPreviousSearchPosition(){
    this.disableNextBtn = false;

    this.scrollObject.target.scrollTop = 20 * --this.idCount;
  }
onPreviousNextPosition(){
    this.disableNextBtn = false;

    this.scrollObject.target.scrollTop = 20 * ++this.idCount;
  }

使用上面的代码，我们可以移动滚动，但是我们需要滚动事件对象，该对象将在手动滚动后获得. 请建议我，如何在组件类中创建滚动事件对象

using above code we can move the scroll but we need scroll event object which will get after scrolling manually. Please suggest me, how to create scroll event object in component class

推荐答案

这是滚动div元素的方式-

This is how you scroll the div element - https://plnkr.co/edit/2v0iVgkOZfISqlFAkrNX?p=preview

示例:

import { Component, ViewChild, ElementRef } from '@angular/core';
@Component({
  selector: 'my-app',
  template: `
    <div #panel style="overflow-y:scroll; height: 20px;" >
      <div *ngFor="let log of arr; let i = index" innerHTML="{{log}}" [id]="i"></div>
    </div>
    <button (click)="onPreviousSearchPosition()">Previous</button>
    <button (click)="onNextSearchPosition()">Next</button>
  `
})
export class AppComponent { 
  public arr = ['foo', 'bar', 'baz'];
  @ViewChild('panel', { read: ElementRef }) public panel: ElementRef<any>;

  public onPreviousSearchPosition(): void {
    this.panel.nativeElement.scrollTop -= 20;
  }

  public onNextSearchPosition(): void {
    this.panel.nativeElement.scrollTop += 20;
  }
}

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