Mastering the Art of Scrolling Down Content with Button Click in Ionic 3

I'm currently developing an Ionic chat application and I need the content to automatically scroll down when the user clicks on the send text button. You can see a visual representation of this in the images linked below.

https://i.stack.imgur.com/gwRWe.png https://i.stack.imgur.com/cPigw.png

Below is the code snippet I am using:

<ion-content scrollDownOnLoad="true" id="chat-window" class="bg" no-padding>

    <ion-list>
        <ion-item text-wrap class="message" *ngFor="let chat of chats" no-lines>
            <div [class]="chat.sent_by == loggedInUserKey ? 'messageRight' : 'messageLeft'">
            <p class="text">{{chat.message}}</p>
            <p [class]="chat.sent_by == loggedInUserKey ? 'datetimeRight' : 'datetimeLeft'">
                <span *ngIf='chat.display_date'>{{chat.date}}</span>
                <span>{{chat.time}}</span>
                <span *ngIf='chat.seen' [class]="chat.sent_by == loggedInUserKey ? 'displayseen' : 'hideseen'">seen</span>
            </p>
           </div>
        </ion-item>
    </ion-list>

</ion-content>
javascriptangularjsionic-frameworkionic3

Answer №1

To begin, bring in content from the ionic-angular library.

 import { Content } from 'ionic-angular';

Utilize the @ViewChild annotation to access the reference of ion-content in your component page.

 @ViewChild(Content) chatlist : Content

Next, within your button click event, you can invoke the method scrollToBottom().

this.chatlist.scrollToBottom();

Check out this demo link

Answer №2

To control scrolling in your web page, you can use properties such as scrollTop and scrollLeft on DOM Nodes.

For example:

var element = document.querySelector("#chat-window");
element.scrollTop = 0; //scrolls the window to the top
element.scrollLeft = 0;

However, there are no built-in properties like scrollBottom or scrollRight. Therefore, you'll need to calculate the scrollTop value based on the content size for each button click.

element.scrollTop = calculatedValue; //where calculatedValue is the determined scrollTop value.

If you want to scroll to the bottom, you can set scrollTop to Infinity as a workaround.

element.scrollTop = Infinity;

Although this approach is not recommended due to potential side effects across different browsers with Infinity values, it's best practice to manage scrollTop updates manually for better code control.

I hope this explanation is helpful to you.

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