catch Errors

PHOTO

Mon Dec 26 2022 18:00:11 GMT+0000 (Coordinated Universal Time)

Saved by @ilivanilton #angular #rxjs-pattern

user$ = this.http.get<User[]>(url).pipe(
tap(data => console.log(JSON.stringfy(data))),
catchError(this.handleError)
)

privat handleError(err: HttpErrorResponse): Observable<never>{
  let errorMsg = `An error occurred: ${err.error.message}`;
  console.log(err);
  return throwError(()=> errorMsg)
}

https://youtu.be/bqIj-m7Uxzk?t=1039

Save snippets that work from anywhere online with our extensions

Available in the Chrome Web Store

Get Firefox Add-on

Get VS Code extension

Comments

More like this

#bash #ionic #angular #capacitor #qrcode #reader #typescript #javascript #html

html-qrcode reader

...

<ion-content class="scanner-hide" *ngIf="scanStatus == false">
  <div class="padding-container center">
    <ion-button color="primary" (click)="scanCode()"><ion-icon slot="start" name="qr-code-outline"></ion-icon> Scanear Código</ion-button> <!-- Botão que chama a função do scanner-->
  </div>
  <ion-card>
    <ion-card-content><h1>{{ result }}</h1></ion-card-content> <!-- mostra o resultado do scan -->
  </ion-card>
  
  <div class="scanner-ui"> <!-- Quando estamos a scanear, chama esta classe-->
    ...Scanner Interface
    </div>
    <div class="ad-spot"></div>
</ion-content>

ThisCodeWorks | This Code Works

https://www.thiscodeworks.com/extension/initializing

Value change trigger in Angular

    this.form.controls.txtName.valueChanges.subscribe((value) => {
	// Logic here

    });

#angular #javascript

angularfire example app

import { BrowserModule, BrowserTransferStateModule } from '@angular/platform-browser';
import { isDevMode, NgModule } from '@angular/core';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { ServiceWorkerModule } from '@angular/service-worker';
import { environment } from '../environments/environment';

import { AngularFireModule } from '@angular/fire';
import { AngularFireStorageModule } from '@angular/fire/storage';

import {
  AngularFireAnalyticsModule,
  DEBUG_MODE as ANALYTICS_DEBUG_MODE,
  ScreenTrackingService,
  UserTrackingService
} from '@angular/fire/analytics';

import { FirestoreComponent } from './firestore/firestore.component';

import { AngularFireDatabaseModule, URL as DATABASE_URL } from '@angular/fire/database';
import { AngularFireAuthModule } from '@angular/fire/auth';
import { AngularFirestoreModule, SETTINGS as FIRESTORE_SETTINGS } from '@angular/fire/firestore';
import { AngularFireMessagingModule } from '@angular/fire/messaging';
import { AngularFireFunctionsModule, ORIGIN as FUNCTIONS_ORIGIN } from '@angular/fire/functions';
import { AngularFireRemoteConfigModule, SETTINGS as REMOTE_CONFIG_SETTINGS } from '@angular/fire/remote-config';
import { AngularFirePerformanceModule, PerformanceMonitoringService } from '@angular/fire/performance';
import { AngularFireAuthGuardModule } from '@angular/fire/auth-guard';
import { DatabaseComponent } from './database/database.component';
import { StorageComponent } from './storage/storage.component';
import { RemoteConfigComponent } from './remote-config/remote-config.component';
import { HomeComponent } from './home/home.component';
import { AuthComponent } from './auth/auth.component';
import { MessagingComponent } from './messaging/messaging.component';

const shouldUseEmulator = () => false;

@NgModule({
  declarations: [
    AppComponent,
    StorageComponent,
    FirestoreComponent,
    DatabaseComponent,
    RemoteConfigComponent,
    HomeComponent,
    AuthComponent,
    MessagingComponent
  ],
  imports: [
    BrowserModule.withServerTransition({ appId: 'serverApp' }),
    BrowserTransferStateModule,
    AppRoutingModule,
    ServiceWorkerModule.register('ngsw-worker.js', { enabled: environment.production }),
    AngularFireModule.initializeApp(environment.firebase),
    AngularFireStorageModule,
    AngularFireAnalyticsModule,
    AngularFireAuthModule,
    AngularFireDatabaseModule,
    AngularFirestoreModule.enablePersistence({ synchronizeTabs: true }),
    AngularFireMessagingModule,
    AngularFireFunctionsModule,
    AngularFireRemoteConfigModule,
    AngularFirePerformanceModule,
    AngularFireAuthGuardModule
  ],
  providers: [
    UserTrackingService,
    ScreenTrackingService,
    PerformanceMonitoringService,
    {
      provide: ANALYTICS_DEBUG_MODE,
      useFactory: () => isDevMode()
    },
    {
      provide: DATABASE_URL,
      useFactory: () => shouldUseEmulator() ? `http://localhost:9000?ns=${environment.firebase.projectId}` : undefined
    },
    { provide: FIRESTORE_SETTINGS, useFactory: () => shouldUseEmulator() ? { host: 'localhost:8080', ssl: false } : {} },
    { provide: FUNCTIONS_ORIGIN, useFactory: () => shouldUseEmulator() ? 'http://localhost:9999' : undefined },
    { provide: REMOTE_CONFIG_SETTINGS, useFactory: () => isDevMode() ? { minimumFetchIntervalMillis: 10_000 } : {} }
  ],
  bootstrap: [AppComponent]
})
export class AppModule {
}

[angular] On focus

@ViewChild('main', {static: false}) main: ElementRef;

  constructor() {}

  skipLink() {
    this.main.nativeElement.focus()
    }

#javascript #typescript #angular #react.js

Ukázka použití zpětných uvozovek

`Pomoci zpětné uvozovky vytvoříte speciální řetězec, který lze psát na více 
 řádků a dají se do něj vkládat výrazy ${ 1+2 }, proměnné ${ x+y }, pole ${ seznam[0] },
 objekty ${ uzivatelske.jmeno } a dokonce ihned volané funkce ${ function() { return x+y; }() } 
 nebo metody ${ "sidon".toUpperCase() }.`

Hello, I can work on your Angular projects. I have already worked on angular and developed some merchandizing, ecommerce and educational web apps and also dashboards. I can work on different angular versions from Angularjs to Angular11.
I am also fullstack developer, if you will have anything from backend then it will be of no problem. just leave me a message and i will get back to you.
thank you.

Generate Module with routing

ng g module /main/customer --module=app --route=customer --routing=true

#typescript #javascript #angular

Ng - Directive - Change backgroundColor

import { Directive, ElementRef, Renderer } from '@angular/core';

@Directive({
    selector: '[appChbgcolor]'
})
export class ChangeBgColorDirective {

    constructor(private el: ElementRef, private renderer: Renderer) {
        this.ChangeBgColor('red');
    }

    ChangeBgColor(color: string) {

        this.renderer.setElementStyle(this.el.nativeElement, 'color', color);
    }
}

#typescript #angular

Ng - Directive: toggle class on click

import { Directive, ElementRef, HostBinding, HostListener } from "@angular/core";

@Directive({
    selector: '[appDropdown]'
})

export class DropdownDirective {
@HostBinding('class.open') isActive = false;

@HostListener('document:click', ['$event']) onClick(event: Event) {
        this.isActive = this.elRef.nativeElement.contains(event.target) ? !this.isActive : false;
    }

    constructor(private elRef: ElementRef) {}
}

#angular #security

Explicitly sanitize HTML content

import { Component, OnInit } from '@angular/core';
import { SecurityService } from './data.service';
import { DomSanitizer, SafeHtml } from '@angular/platform-browser';
@Component({
  selector: 'app-root',
  template: `<div [innerHtml] = "safeValue"></div>`,
  providers: [SecurityService]
})
export class AppComponent implements OnInit {
  safeValue: SafeHtml;
  constructor(private secure: SecurityService) {
    this.safeValue = this.secure.getSafeHtml("<h1>Sanitization Success</h1>");
  }
  ngOnInit() {
  }
}

#typescript #angular

html, body, div, span, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
abbr, address, cite, code,
del, dfn, em, img, ins, kbd, q, samp,
small, strong, sub, sup, var,
b, i,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section, summary,
time, mark, audio, video {
    margin:0;
    padding:0;
    border:0;
    outline:0;
    font-size:100%;
    vertical-align:baseline;
    background:transparent;
}

body {
    line-height:1;
}

article,aside,details,figcaption,figure,
footer,header,hgroup,menu,nav,section { 
    display:block;
}

nav ul {
    list-style:none;
}

blockquote, q {
    quotes:none;
}

blockquote:before, blockquote:after,
q:before, q:after {
    content:’’;
    content:none;
}

a {
    margin:0;
    padding:0;
    font-size:100%;
    vertical-align:baseline;
    background:transparent;
}

/* change colours to suit your needs */
ins {
    background-color:#ff9;
    color:#000;
    text-decoration:none;
}

/* change colours to suit your needs */
mark {
    background-color:#ff9;
    color:#000; 
    font-style:italic;
    font-weight:bold;
}

del {
    text-decoration: line-through;
}

abbr[title], dfn[title] {
    border-bottom:1px dotted;
    cursor:help;
}

table {
    border-collapse:collapse;
    border-spacing:0;
}

/* change border colour to suit your needs */
hr {
    display:block;
    height:1px;
    border:0;   
    border-top:1px solid #cccccc;
    margin:1em 0;
    padding:0;
}

input, select {
    vertical-align:middle;
}

#javascript #angular

ng serve -o --poll=2000

Kopseer - grid overflow on some coponent.. uk-form-control-margin

.config-heading {
  border-bottom: 1px solid #cccccc;
  text-align: center;
  padding-top: 0.5rem;
  margin-bottom: 0.5rem;
  padding-bottom: 0.5rem;
}

.uk-form-controls {
  margin-left: 0 !important;
}

#angular #commandline

Angular Commands

ng generate component xyz

Browse more snippets >>