[英]Ionic2 How to scroll a list?
我正在使用Ionic2。
我有項目清單。 關於事件(調用messageSend
函數),我想滾動到列表頂部。
messages.html
<ion-content padding class="messages-page-content">
<ion-scroll scrollY="true" class="messages">
<ion-list class="message-list">
<ion-item ....
messages.ts
messageSend(va, vi) {
// scroll to top of list
}
任何建議表示贊賞。
更新
這是一些示例代碼:
<ion-header>
<ion-navbar>
<ion-title>
<ion-avatar item-left class='menu-ion-avatar'><img src='{{you.avatar ? you.avatar : you.avatar64 ? you.avatar64 : you.avatarFirebase ? you.avatarFirebase : "images/blank-profile-picture.png"}}'></ion-avatar>
<div class='item-avatar-name'>{{you.displayName}}</div>
<div class="title-timestamp">{{you.lastAccessDate | amDateFormat: 'D MMM YYYY h:mm a'}}</div>
</ion-title>
</ion-navbar>
</ion-header>
<ion-content padding class="messages-page-content">
<ion-scroll scrollY="true" class="messages">
<ion-list class="message-list" id="message-list">
<ion-item class="message-item" *ngFor="let item of firelist | async">
<div [ngClass]="{'message message-me':(item.memberId1 == me.uid)}">
<div [ngClass]="{'message message-you':(item.memberId1 == you.uid)}">
<div class="message-content">{{item.message_text}}</div>
<span class="time-tick">
<span class="message-timestamp-date">{{item.timestamp | amDateFormat: 'D MMM YY'}}</span>
<span class="message-timestamp">{{item.timestamp | amDateFormat: 'h:mm a'}}</span>
<div *ngIf="item.memberId1 === me.uid && item.readByReceiver === true">
<span class="checkmark">
<div class="checkmark_stem"></div>
<div class="checkmark_kick"></div>
</span>
</div>
</span>
</div>
</div>
</ion-item>
</ion-list>
</ion-scroll>
</ion-content>
<ion-footer>
<form #f="ngForm">
<ion-grid>
<ion-row>
<ion-col width-90>
<ion-input [(ngModel)]="message" name="messageText" required placeholder="message..."></ion-input>
</ion-col>
<ion-col width-10 center>
<button (click)="messageSend(f.value, f.valid)" full [disabled]="f.valid === false"><ion-icon class="message-send" name="send"></ion-icon></button>
</ion-col>
</ion-row>
</ion-grid>
</form>
</ion-footer>
如果列表的頂部也是頁面的頂部,則可以使用內容實例中的scrollToTop()
方法,如下所示:
import { Component, ViewChild } from '@angular/core';
import { Content } from 'ionic-angular';
@Component({...})
export class MyPage{
@ViewChild(Content) content: Content;
scrollToTop() {
this.content.scrollToTop();
}
}
如果不是,則需要獲取元素的位置並使用scrollTo(x,y,duration)
方法,如下所示:
import { Component, ViewChild } from "@angular/core";
import { Content } from 'ionic-angular';
@Component({...})
export class MyPage {
@ViewChild(Content) content: Content;
constructor() { }
public scrollElement() {
let element = document.getElementById('target');
this.content.scrollTo(0, element.offsetTop, 500);
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.