javascript - 如何解决 "Cannot read property ' scrollIntoView' of undefined"？

Question

我想在单击 中的按钮时滚动到特定的 div Angular 7 ，下面是我正在使用的代码，但它在 stackblitz 中工作，但在我的项目中使用时显示错误。
“无法读取未定义的属性‘scrollIntoView’”。

https://stackblitz.com/edit/angular-scroll-local-variable?file=src%2Fapp%2Fscroll.component.ts

试试这个链接:https://stackblitz.com/edit/angular-scroll-local-variable-ja96uz?file=src%2Fapp%2Fapp.component.html

<button (click)="scroll(target)"></button>
<div #target>Your target</div>

在组件中:

scroll(el) {
    el.scrollIntoView();
}

Answer 1

尝试提供scrollToAnchor方法的 Angular ViewportScroller服务

滚动.html

<button (click)="scroll('target')">Click to scroll</button>
<div id="target">Your target</div>

滚动.ts

import { Component, Input } from '@angular/core';
import { ViewportScroller } from '@angular/common';
@Component({
  selector: 'scroll',
  template: `
    <button (click)="scroll('target')">Click to scroll</button>
    <div id="target">Your target</div>
  `,
  styles: [`h1 { font-family: Lato; }`, `div { margin-top: 5000px; }`]
})
export class ScrollComponent {

  constructor(private vps: ViewportScroller) {

  }
  scroll(id) {
    this.vps.scrollToAnchor(id);
  }
}

示例: https://stackblitz.com/edit/angular-scroll-local-variable-99hwvo