CODEWITHSUNDEEP
angulartypescript
Bhrungarajni
Bhrungarajni

Reputation: 2535

How to make the page to scroll down automatically to the bottom as soon as message is sent or message is opened in angular2

i have a message conversation section, where in i need to show the scroll to the bottom, and when the page opens again the scroll must be at the bottom. i mean last message should be displayed first.

HTML:

<ul>
        <li *ngFor="let reply of message_show.messages">
          <img [src]="reply.from_user_image || '../assets/images/msg.png'"/>
          <p><b>{{reply.name}} </b> <span> {{reply.updated_at | date:'dd.MM.yyyy'}} - {{reply.updated_at | date:'h:mm'}}</span></p>
          <p>{{reply.text}}</p>
        </li>
      </ul>

Ts:

loadMessages() {
    this.service
          .getMessages()
          .subscribe(
            data => {
              this.messagesdata = data;
              this.activeMessages = data.filter(msg => msg.active == true && msg.from_user_name !== 'Anonymus' && msg.messages.length > 0)
              this.closedMessages = data.filter(msg => msg.active == false && msg.from_user_name !== 'Anonymus' && msg.messages.length > 0);
              if (this.activeMessages.length > 0) {
                if(!this.message_show) {
                  var test = this.message_show = this.activeMessages[0];
                  this.message = true;
                  this.message_id = this.activeMessages[0].id;
                  this.message_show.messages.map(function(msg) {
                    if(msg.from_user_id == test.from_user_id) {
                      msg.from_user_image = test.from_user_image;
                    } else {
                      msg.from_user_image = test.to_user_image;
                    }
                    if(msg.to_user_id == test.to_user_id) {
                      msg.to_user_image = test.to_user_image;
                    } else {
                      msg.to_user_image = test.to_user_image;
                    }
                  })
                }
              }             
            },error => {});
  }

Upvotes: 3

Views: 17461

Answers (2)

Sravan
Sravan

Reputation: 18647

Here is a solution in angular way:

  • I added #scrollCottom template variable.
  • You can use ViewChild to get the Element reference and should check the scroll bottom issue.

Component;

import { AfterViewChecked, ElementRef, ViewChild, OnInit} from 'angular2/core'
@Component({
    ...
})
export class YourComponent implements OnInit, AfterViewChecked {
    @ViewChild('scrollBottom') private scrollBottom: ElementRef;

    ngOnInit() {
        this.scrollToBottom();
    }

    ngAfterViewChecked() {        
     this.scrollToBottom();        
    } 

    scrollToBottom(): void {
        try {
            this.scrollBottom.nativeElement.scrollTop = this.scrollBottom.nativeElement.scrollHeight;
        } catch(err) { }
    }
}

HTML:

<ul #scrollBottom>
  <li *ngFor="let reply of message_show.messages">
    <img [src]="reply.from_user_image || '../assets/images/msg.png'"/>
    <p><b>{{reply.name}} </b> <span> {{reply.updated_at | date:'dd.MM.yyyy'}} - {{reply.updated_at | date:'h:mm'}}</span></p>
    <p>{{reply.text}}</p>
  </li>
</ul>

Upvotes: 10

Lakshmi Prasanna
Lakshmi Prasanna

Reputation: 456

You can use 

 window.scrollTo(0,document.body.scrollHeight);

Here you can find the discussion related

Scroll Automatically to the Bottom of the Page

Upvotes: 5

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