Ngx-Bootstrap - Alerts

Alerts provides contextual messages for typical user actions pke info, error with available and flexible alert messages.

AlertComponent

Displays collapsible content panels for presenting information in a pmited amount of space.

selector

alert,bs-alert

Inputs

dismissible − boolean, If set, displays an inpne "Close" button, default: false

dismissOnTimeout − string | number, Number in milpseconds, after which alert will be closed

isOpen − boolean, Is alert visible, default: true

type − string, alert type. Provides one of four bootstrap supported contextual classes: success, info, warning and danger, default: warning

Outputs

onClose − This event fires immediately after close instance method is called, $event is an instance of Alert component.

onClosed − This event fires when alert closed, $event is an instance of Alert component

AlertConfig

Properties

dismissible − boolean, is alerts are dismissible by default, default: false

dismissOnTimeout − number, default time before alert will dismiss, default: undefined

type − string, default alert type, default: warning

Example

As we re going to use alerts, We ve to update app.module.ts used in ngx-bootstrap Accordion chapter to use AlertModule and AlertConfig.

Update app.module.ts to use the AlertModule and AlertConfig.

app.module.ts

import { BrowserModule } from  @angular/platform-browser ;
import { NgModule } from  @angular/core ;
import { BrowserAnimationsModule } from  @angular/platform-browser/animations ;
import { AppComponent } from  ./app.component ;
import { TestComponent } from  ./test/test.component ;
import { AccordionModule } from  ngx-bootstrap/accordion ;
import { AlertModule, AlertConfig } from  ngx-bootstrap/alert ;
@NgModule({
   declarations: [
      AppComponent,
      TestComponent
   ],
   imports: [
      BrowserAnimationsModule,
      BrowserModule,
      AccordionModule,
      AlertModule
   ],
   providers: [AlertConfig],
   bootstrap: [AppComponent]
})
export class AppModule { }

Update test.component.html to use the alerts.

test.component.html

<alert type="success" 
   [dismissible]="dismissible"
   [isOpen]="open"
   (onClosed)="log($event)"
   [dismissOnTimeout]="timeout">
   <h4 class="alert-heading">Well done!</h4>
   <p>Success Message</p>
</alert>
<alert type="info">
   <strong>Heads up!</strong> Info
</alert>
<alert type="warning">
   <strong>Warning!</strong> Warning
</alert>
<alert type="danger">
   <strong>Oh snap!</strong> Error
</alert>

Update test.component.ts for corresponding variables and methods.

test.component.ts

import { Component, OnInit } from  @angular/core ;
@Component({
   selector:  app-test ,
   templateUrl:  ./test.component.html ,
   styleUrls: [ ./test.component.css ]
})
export class TestComponent implements OnInit {
   open: boolean = true;
   dismissible: boolean = true;
   timeout: number = 10000;
   constructor() { }
   
   ngOnInit(): void {
   }
   log(alert){
      console.log( alert message closed );
   }
}

Build and Serve

Run the following command to start the angular server.

ng serve

Once server is up and running. Open http://localhost:4200 and verify the following output.