typescript 使用angular2上的按钮水平滚动

Horizontal Scroll using buttons on angular2

提问by Sergio Mendez

So I have this app in angular2 where I need to scroll a component horizontally but with buttons right and left. So I need a function for each button that scroll to right or left the content. I need something like this:

所以我在 angular2 中有这个应用程序，我需要水平滚动一个组件，但有左右按钮。所以我需要为每个向右或向左滚动内容的按钮提供一个功能。我需要这样的东西：

I tried using document.getElementById('myscrolldiv').animate({ scrollLeft: "-=" + 250 + "px"; }but Angular does not recognize the animateline.

我尝试使用document.getElementById('myscrolldiv').animate({ scrollLeft: "-=" + 250 + "px"; }但 Angular 无法识别该animate行。

So I am looking for a diferent way of scroll horizontally using buttons but NOT using jquery. Is there any way to do this in angular?

所以我正在寻找一种使用按钮而不是使用 jquery 水平滚动的不同方式。有没有办法在角度上做到这一点？

Here is my html

这是我的 html

<div class="container">
  <div class="side">
    <mat-icon (click)="scrollLeft()">keyboard_arrow_left</mat-icon>
  </div>
  <div id="widgetsContent" class="middle">
    <div class="scrolls">
      <div class="info-widget">
         WIDGET
      </div>
      <div class="info-widget">
         WIDGET
      </div>
      <div class="info-widget">
         WIDGET
      </div>
      <div class="info-widget">
         WIDGET
      </div>
      <div class="info-widget">
         WIDGET
      </div>
      <div class="info-widget">
         WIDGET
      </div>
    </div>
  </div>
  <div class="side">
    <mat-icon (click)="scrollRight()">keyboard_arrow_right</mat-icon>
  </div>
</div>

And here is my css

这是我的 css

.container {
  display: flex;
  height: 22.5vh !important;
}

.side {
  width: 50px;
  height: 22.5vh !important;
}

.middle {
  flex-grow: 1;
  height: 22.5vh !important;
  overflow-x: scroll;
  overflow-y: hidden;
  white-space: nowrap;
}

So, how do I scroll right and left pushing the buttons? please help.

那么，我如何左右滚动按钮？请帮忙。

回答by H.Azizkhani

Import ViewChild and ElementRef to get elemenet refrence.

导入 ViewChild 和 ElementRef 以获取元素引用。

use #localvariable as shown here, <div #widgetsContent class="middle">

使用 #localvariable 如下所示， <div #widgetsContent class="middle">

get element in component, @ViewChild('widgetsContent', { read: ElementRef }) public widgetsContent: ElementRef<any>;

获取组件中的元素， @ViewChild('widgetsContent', { read: ElementRef }) public widgetsContent: ElementRef<any>;

change scrollvalue, this.widgetsContent.nativeElement.scrollTo({ left: (this.widgetsContent.nativeElement.scrollLeft + 150), behavior: 'smooth' });

更改滚动值， this.widgetsContent.nativeElement.scrollTo({ left: (this.widgetsContent.nativeElement.scrollLeft + 150), behavior: 'smooth' });

An example is shown below

一个例子如下所示

import { Component, OnInit, ViewChild, ElementRef } from "@angular/core";

@Component({
    selector: 'my-app',
    template: `
                <div class="container">
                <div style="float: left">
                    <button (click)="scrollLeft()">left</button>
                </div>

                <div #widgetsContent class="middle">
                    <div class="info-widget">
                    WIDGET
                    </div>
                    <div class="info-widget">
                    WIDGET
                    </div>
                    <div class="info-widget">
                    WIDGET
                    </div>
                    <div class="info-widget">
                    WIDGET
                    </div>
                    <div class="info-widget">
                    WIDGET
                    </div>
                    <div class="info-widget">
                    WIDGET
                    </div>
                </div>

                <div style="float: right">
                    <button (click)="scrollRight()">right</button>
                </div>
                </div>
            `,
    styles: [`
      .info-widget {
        width: 31.75%;
        border: 1px solid black;
        display: inline-block;
      }

      .middle {
        float: left;
        width: 90%;
        overflow: auto;
        /*will change this to hidden later to deny scolling to user*/
        white-space: nowrap;
      }
            `]
})

export class AppComponent { 

  @ViewChild('widgetsContent', { read: ElementRef }) public widgetsContent: ElementRef<any>;

  public scrollRight(): void {
    this.widgetsContent.nativeElement.scrollTo({ left: (this.widgetsContent.nativeElement.scrollLeft + 150), behavior: 'smooth' });
  }

  public scrollLeft(): void {
    this.widgetsContent.nativeElement.scrollTo({ left: (this.widgetsContent.nativeElement.scrollLeft - 150), behavior: 'smooth' });
  }
}

回答by Sahil Ralkar

Consider the following solution

考虑以下解决方案

In .html

在 .html 中

<div #widgetsContent class="custom-slider-main">
    <div class="info-widget">
         WIDGET
      </div>
      <div class="info-widget">
         WIDGET
      </div>
      <div class="info-widget">
         WIDGET
      </div>
      <div class="info-widget">
         WIDGET
      </div>
      <div class="info-widget">
         WIDGET
      </div>
      <div class="info-widget">
         WIDGET
      </div>
</div>

In .scss

在.scss中

.custom-slider-main{
    display: flex;
    overflow: hidden;    
    scroll-behavior: smooth;
}

In .ts

在.ts

@ViewChild('widgetsContent') widgetsContent: ElementRef;

And On click of left/right button use the following functions

并单击左/右按钮使用以下功能

scrollLeft(){
    this.widgetsContent.nativeElement.scrollLeft -= 150;
  }

  scrollRight(){
    this.widgetsContent.nativeElement.scrollLeft += 150;
  }