This is documentation for Stream Chat Angular SDK v4, which is nolonger actively maintained. For up-to-date documentation, see the latest version (v5).

Mention actions

In this example, we will demonstrate how to create custom mention actions if a user clicks on or hovers over a mention in a message.

Custom mention template

You can provide a custom message template to the CustomTemplatesService:

Create the template (for example in your AppComponent):

<ng-template #mentionTemplate let-user="user">
  <b>@{{ user.name || user.id }}</b>
</ng-template>

The Message component will provide the mentioned user in a variable called user, the object has a UserResponse type and you can use it to display information about the user.

This template looks and works like the default mention template, however you can add interactions to this element.

These are the necessary steps:

Create a reference to the custom template
Import the CustomTemplatesService
Register your custom template

Here is an example file:

import {
  AfterViewInit,
  Component,
  TemplateRef,
  ViewChild,
} from "@angular/core";
import {
  ChatClientService,
  ChannelService,
  StreamI18nService,
} from "stream-chat-angular";
import {
  CustomTemplatesService,
  MentionTemplateContext,
} from "stream-chat-angular";
import { environment } from "../environments/environment";

@Component({
  selector: "app-root",
  templateUrl: "./app.component.html",
  styleUrls: ["./app.component.scss"],
})
export class AppComponent implements AfterViewInit {
  // Create a reference to the custom template
  @ViewChild("mentionTemplate")
  private mentionTemplate!: TemplateRef<MentionTemplateContext>;

  constructor(
    private chatService: ChatClientService,
    private channelService: ChannelService,
    private streamI18nService: StreamI18nService,
    private customTemplatesService: CustomTemplatesService // Import the customTemplatesService
  ) {
    void this.chatService.init(
      environment.apiKey,
      environment.userId,
      environment.userToken
    );
    void this.channelService.init({
      type: "messaging",
      members: { $in: [environment.userId] },
    });
    this.streamI18nService.setTranslation();
  }

  ngAfterViewInit(): void {
    // Register your custom template
    this.customTemplatesService.mentionTemplate$.next(this.mentionTemplate);
  }
}

Display user information on click

In this step we will create a popover with additional user information that will be displayed if the user clicks on a mention. We are using the ngx-popperjs library for the popover, but you can use a different library as well.

Install `ngx-popperjs`

Let’s install the necessary dependencies:

npm install @popperjs/core ngx-popperjs --save

Import the `NgxPopperjsModule` module

import {NgxPopperjsModule} from 'ngx-popperjs';

@NgModule({
 // ...
 imports: [
   // ...
   NgxPopperjsModule
 ]
})

Import SCSS

Add this to your styles.scss:

@import "~ngx-popperjs/scss/theme-white";

CSS is also supported.

<ng-template #mentionTemplate let-user="user">
  <span
    style="cursor: pointer"
    [popper]="popperContent"
    [popperPositionFixed]="true"
  >
    <b>@{{ user.name || user.id }}</b>
  </span>
  <popper-content #popperContent style="display: inline">
    <div style="display: flex; align-items: center">
      <stream-avatar
        [imageUrl]="user.image"
        [name]="user.name || user.id"
      ></stream-avatar>
      <b>{{ user.name || user.id }}</b>
      <span>&nbsp;{{ user.online ? "online" : "offline" }}</span>
    </div>
  </popper-content>
</ng-template>

This is the popover that is displayed if we click on a mention in a message:

ngx-popperjs has a lot of other configuration options, feel free to explore those.

Display user information on hover

Let’s modify our solution and display the popover on hover instead of click:

We need to add a variable to our component class:

import { NgxPopperjsTriggers } from "ngx-popperjs";

popoverTrigger = NgxPopperjsTriggers.hover;

And modify our template:

<ng-template #mentionTemplate let-user="user">
  <span
    style="cursor: pointer"
    [popper]="popperContent"
    [popperPositionFixed]="true"
    [popperTrigger]="popoverTrigger"
  >
    <b>@{{ user.name || user.id }}</b>
  </span>
  <popper-content #popperContent style="display: inline">
    <div style="display: flex; align-items: center">
      <stream-avatar
        [imageUrl]="user.image"
        [name]="user.name || user.id"
      ></stream-avatar>
      <b>{{ user.name || user.id }}</b>
      <span>&nbsp;{{ user.online ? "online" : "offline" }}</span>
    </div>
  </popper-content>
</ng-template>

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