首页 > 代码库 > [Angular] Scrolling the Message List To the Bottom Automatically Using OnChanges
[Angular] Scrolling the Message List To the Bottom Automatically Using OnChanges
Let‘s say the message list can Input (messages) from parent component, and what we want to do is when there are new message, we will scroll message list to the bottom to show the lastest message.
import {Component, Input, ViewChild, OnChanges, SimpleChanges} from ‘@angular/core‘;import {last} from ‘lodash‘;@Component({ selector: ‘message-list‘, templateUrl: ‘./message-list.component.html‘, styleUrls: [‘./message-list.component.css‘]})export class MessageListComponent implements OnChanges{ @Input() messages; @ViewChild(‘list‘) list; constructor() { } ngOnChanges(changes: SimpleChanges): void { if(changes[‘messages‘]) { const previous = changes[‘messages‘].previousValue; const current = changes[‘messages‘].currentValue; if(previous.length < current.length) { setTimeout(() => this.scrollToBottom()); } } } scrollToBottom(): void { const items = this.list.nativeElement.querySelectorAll(‘li‘); const lastItem: any = last(items); lastItem.scrollIntoView(); }}
[Angular] Scrolling the Message List To the Bottom Automatically Using OnChanges
声明：以上内容来自用户投稿及互联网公开渠道收集整理发布，本网站不拥有所有权，未作人工编辑处理，也不承担相关法律责任，若内容有误或涉及侵权可进行投诉： 投诉/举报 工作人员会在5个工作日内联系你，一经查实，本站将立刻删除涉嫌侵权内容。