Kamalesh Siddhantam: How You Can Bring Creativity in Your Business

Kamalesh Kumar Siddhantam is a highly technical and creative IT professional offering his unmatched technical services to his clients since last one decade. There are number of individuals and business companies that have benefited from his creativity and smart techniques of IT. https://kamaleshkumarsiddhantam.blogspot.com/2020/07/kamalesh-kumar-siddhantam-how-you-can.html

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Kamalesh Siddhantam: How You Can Bring Creativity in Your Business
Carmen  Grimes

Carmen Grimes

1595491178

Best Electric Bikes and Scooters for Rental Business or Campus Facility

The electric scooter revolution has caught on super-fast taking many cities across the globe by storm. eScooters, a renovated version of old-school scooters now turned into electric vehicles are an environmentally friendly solution to current on-demand commute problems. They work on engines, like cars, enabling short traveling distances without hassle. The result is that these groundbreaking electric machines can now provide faster transport for less — cheaper than Uber and faster than Metro.

Since they are durable, fast, easy to operate and maintain, and are more convenient to park compared to four-wheelers, the eScooters trend has and continues to spike interest as a promising growth area. Several companies and universities are increasingly setting up shop to provide eScooter services realizing a would-be profitable business model and a ready customer base that is university students or residents in need of faster and cheap travel going about their business in school, town, and other surrounding areas.

Electric Scooters Trends and Statistics

In many countries including the U.S., Canada, Mexico, U.K., Germany, France, China, Japan, India, Brazil and Mexico and more, a growing number of eScooter users both locals and tourists can now be seen effortlessly passing lines of drivers stuck in the endless and unmoving traffic.

A recent report by McKinsey revealed that the E-Scooter industry will be worth― $200 billion to $300 billion in the United States, $100 billion to $150 billion in Europe, and $30 billion to $50 billion in China in 2030. The e-Scooter revenue model will also spike and is projected to rise by more than 20% amounting to approximately $5 billion.

And, with a necessity to move people away from high carbon prints, traffic and congestion issues brought about by car-centric transport systems in cities, more and more city planners are developing more bike/scooter lanes and adopting zero-emission plans. This is the force behind the booming electric scooter market and the numbers will only go higher and higher.

Companies that have taken advantage of the growing eScooter trend develop an appthat allows them to provide efficient eScooter services. Such an app enables them to be able to locate bike pick-up and drop points through fully integrated google maps.

List of Best Electric Bikes for Rental Business or Campus Facility 2020:

It’s clear that e scooters will increasingly become more common and the e-scooter business model will continue to grab the attention of manufacturers, investors, entrepreneurs. All this should go ahead with a quest to know what are some of the best electric bikes in the market especially for anyone who would want to get started in the electric bikes/scooters rental business.

We have done a comprehensive list of the best electric bikes! Each bike has been reviewed in depth and includes a full list of specs and a photo.

Billy eBike

mobile-best-electric-bikes-scooters https://www.kickstarter.com/projects/enkicycles/billy-were-redefining-joyrides

To start us off is the Billy eBike, a powerful go-anywhere urban electric bike that’s specially designed to offer an exciting ride like no other whether you want to ride to the grocery store, cafe, work or school. The Billy eBike comes in 4 color options – Billy Blue, Polished aluminium, Artic white, and Stealth black.

Price: $2490

Available countries

Available in the USA, Europe, Asia, South Africa and Australia.This item ships from the USA. Buyers are therefore responsible for any taxes and/or customs duties incurred once it arrives in your country.

Features

  • Control – Ride with confidence with our ultra-wide BMX bars and a hyper-responsive twist throttle.
  • Stealth- Ride like a ninja with our Gates carbon drive that’s as smooth as butter and maintenance-free.
  • Drive – Ride further with our high torque fat bike motor, giving a better climbing performance.
  • Accelerate – Ride quicker with our 20-inch lightweight cutout rims for improved acceleration.
  • Customize – Ride your own way with 5 levels of power control. Each level determines power and speed.
  • Flickable – Ride harder with our BMX /MotoX inspired geometry and lightweight aluminum package

Specifications

  • Maximum speed: 20 mph (32 km/h)
  • Range per charge: 41 miles (66 km)
  • Maximum Power: 500W
  • Motor type: Fat Bike Motor: Bafang RM G060.500.DC
  • Load capacity: 300lbs (136kg)
  • Battery type: 13.6Ah Samsung lithium-ion,
  • Battery capacity: On/off-bike charging available
  • Weight: w/o batt. 48.5lbs (22kg), w/ batt. 54lbs (24.5kg)
  • Front Suspension: Fully adjustable air shock, preload/compression damping /lockout
  • Rear Suspension: spring, preload adjustment
  • Built-in GPS

Why Should You Buy This?

  • Riding fun and excitement
  • Better climbing ability and faster acceleration.
  • Ride with confidence
  • Billy folds for convenient storage and transportation.
  • Shorty levers connect to disc brakes ensuring you stop on a dime
  • belt drives are maintenance-free and clean (no oil or lubrication needed)

**Who Should Ride Billy? **

Both new and experienced riders

**Where to Buy? **Local distributors or ships from the USA.

Genze 200 series e-Bike

genze-best-electric-bikes-scooters https://www.genze.com/fleet/

Featuring a sleek and lightweight aluminum frame design, the 200-Series ebike takes your riding experience to greater heights. Available in both black and white this ebike comes with a connected app, which allows you to plan activities, map distances and routes while also allowing connections with fellow riders.

Price: $2099.00

Available countries

The Genze 200 series e-Bike is available at GenZe retail locations across the U.S or online via GenZe.com website. Customers from outside the US can ship the product while incurring the relevant charges.

Features

  • 2 Frame Options
  • 2 Sizes
  • Integrated/Removable Battery
  • Throttle and Pedal Assist Ride Modes
  • Integrated LCD Display
  • Connected App
  • 24 month warranty
  • GPS navigation
  • Bluetooth connectivity

Specifications

  • Maximum speed: 20 mph with throttle
  • Range per charge: 15-18 miles w/ throttle and 30-50 miles w/ pedal assist
  • Charging time: 3.5 hours
  • Motor type: Brushless Rear Hub Motor
  • Gears: Microshift Thumb Shifter
  • Battery type: Removable Samsung 36V, 9.6AH Li-Ion battery pack
  • Battery capacity: 36V and 350 Wh
  • Weight: 46 pounds
  • Derailleur: 8-speed Shimano
  • Brakes: Dual classic
  • Wheels: 26 x 20 inches
  • Frame: 16, and 18 inches
  • Operating Mode: Analog mode 5 levels of Pedal Assist Thrott­le Mode

Norco from eBikestore

norco-best-electric-bikes-scooters https://ebikestore.com/shop/norco-vlt-s2/

The Norco VLT S2 is a front suspension e-Bike with solid components alongside the reliable Bosch Performance Line Power systems that offer precise pedal assistance during any riding situation.

Price: $2,699.00

Available countries

This item is available via the various Norco bikes international distributors.

Features

  • VLT aluminum frame- for stiffness and wheel security.
  • Bosch e-bike system – for their reliability and performance.
  • E-bike components – for added durability.
  • Hydraulic disc brakes – offer riders more stopping power for safety and control at higher speeds.
  • Practical design features – to add convenience and versatility.

Specifications

  • Maximum speed: KMC X9 9spd
  • Motor type: Bosch Active Line
  • Gears: Shimano Altus RD-M2000, SGS, 9 Speed
  • Battery type: Power Pack 400
  • Battery capacity: 396Wh
  • Suspension: SR Suntour suspension fork
  • Frame: Norco VLT, Aluminum, 12x142mm TA Dropouts

Bodo EV

bodo-best-electric-bikes-scootershttp://www.bodoevs.com/bodoev/products_show.asp?product_id=13

Manufactured by Bodo Vehicle Group Limited, the Bodo EV is specially designed for strong power and extraordinary long service to facilitate super amazing rides. The Bodo Vehicle Company is a striking top in electric vehicles brand field in China and across the globe. Their Bodo EV will no doubt provide your riders with high-level riding satisfaction owing to its high-quality design, strength, breaking stability and speed.

Price: $799

Available countries

This item ships from China with buyers bearing the shipping costs and other variables prior to delivery.

Features

  • Reliable
  • Environment friendly
  • Comfortable riding
  • Fashionable
  • Economical
  • Durable – long service life
  • Braking stability
  • LED lighting technology

Specifications

  • Maximum speed: 45km/h
  • Range per charge: 50km per person
  • Charging time: 8 hours
  • Maximum Power: 3000W
  • Motor type: Brushless DC Motor
  • Load capacity: 100kg
  • Battery type: Lead-acid battery
  • Battery capacity: 60V 20AH
  • Weight: w/o battery 47kg

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Carmen  Grimes

Carmen Grimes

1595494844

How to start an electric scooter facility/fleet in a university campus/IT park

Are you leading an organization that has a large campus, e.g., a large university? You are probably thinking of introducing an electric scooter/bicycle fleet on the campus, and why wouldn’t you?

Introducing micro-mobility in your campus with the help of such a fleet would help the people on the campus significantly. People would save money since they don’t need to use a car for a short distance. Your campus will see a drastic reduction in congestion, moreover, its carbon footprint will reduce.

Micro-mobility is relatively new though and you would need help. You would need to select an appropriate fleet of vehicles. The people on your campus would need to find electric scooters or electric bikes for commuting, and you need to provide a solution for this.

To be more specific, you need a short-term electric bike rental app. With such an app, you will be able to easily offer micro-mobility to the people on the campus. We at Devathon have built Autorent exactly for this.

What does Autorent do and how can it help you? How does it enable you to introduce micro-mobility on your campus? We explain these in this article, however, we will touch upon a few basics first.

Micro-mobility: What it is

micro-mobility

You are probably thinking about micro-mobility relatively recently, aren’t you? A few relevant insights about it could help you to better appreciate its importance.

Micro-mobility is a new trend in transportation, and it uses vehicles that are considerably smaller than cars. Electric scooters (e-scooters) and electric bikes (e-bikes) are the most popular forms of micro-mobility, however, there are also e-unicycles and e-skateboards.

You might have already seen e-scooters, which are kick scooters that come with a motor. Thanks to its motor, an e-scooter can achieve a speed of up to 20 km/h. On the other hand, e-bikes are popular in China and Japan, and they come with a motor, and you can reach a speed of 40 km/h.

You obviously can’t use these vehicles for very long commutes, however, what if you need to travel a short distance? Even if you have a reasonable public transport facility in the city, it might not cover the route you need to take. Take the example of a large university campus. Such a campus is often at a considerable distance from the central business district of the city where it’s located. While public transport facilities may serve the central business district, they wouldn’t serve this large campus. Currently, many people drive their cars even for short distances.

As you know, that brings its own set of challenges. Vehicular traffic adds significantly to pollution, moreover, finding a parking spot can be hard in crowded urban districts.

Well, you can reduce your carbon footprint if you use an electric car. However, electric cars are still new, and many countries are still building the necessary infrastructure for them. Your large campus might not have the necessary infrastructure for them either. Presently, electric cars don’t represent a viable option in most geographies.

As a result, you need to buy and maintain a car even if your commute is short. In addition to dealing with parking problems, you need to spend significantly on your car.

All of these factors have combined to make people sit up and think seriously about cars. Many people are now seriously considering whether a car is really the best option even if they have to commute only a short distance.

This is where micro-mobility enters the picture. When you commute a short distance regularly, e-scooters or e-bikes are viable options. You limit your carbon footprints and you cut costs!

Businesses have seen this shift in thinking, and e-scooter companies like Lime and Bird have entered this field in a big way. They let you rent e-scooters by the minute. On the other hand, start-ups like Jump and Lyft have entered the e-bike market.

Think of your campus now! The people there might need to travel short distances within the campus, and e-scooters can really help them.

How micro-mobility can benefit you

benefits-micromobility

What advantages can you get from micro-mobility? Let’s take a deeper look into this question.

Micro-mobility can offer several advantages to the people on your campus, e.g.:

  • Affordability: Shared e-scooters are cheaper than other mass transportation options. Remember that the people on your campus will use them on a shared basis, and they will pay for their short commutes only. Well, depending on your operating model, you might even let them use shared e-scooters or e-bikes for free!
  • Convenience: Users don’t need to worry about finding parking spots for shared e-scooters since these are small. They can easily travel from point A to point B on your campus with the help of these e-scooters.
  • Environmentally sustainable: Shared e-scooters reduce the carbon footprint, moreover, they decongest the roads. Statistics from the pilot programs in cities like Portland and Denver showimpressive gains around this key aspect.
  • Safety: This one’s obvious, isn’t it? When people on your campus use small e-scooters or e-bikes instead of cars, the problem of overspeeding will disappear. you will see fewer accidents.

#android app #autorent #ios app #mobile app development #app like bird #app like bounce #app like lime #autorent #bird scooter business model #bird scooter rental #bird scooter rental cost #bird scooter rental price #clone app like bird #clone app like bounce #clone app like lime #electric rental scooters #electric scooter company #electric scooter rental business #how do you start a moped #how to start a moped #how to start a scooter rental business #how to start an electric company #how to start electric scooterrental business #lime scooter business model #scooter franchise #scooter rental business #scooter rental business for sale #scooter rental business insurance #scooters franchise cost #white label app like bird #white label app like bounce #white label app like lime

Why Business Cards Printing are essential for your business

No matter how technological advancement helps in communication but business card printing still worth it. Most businesses prefer to have and share business cards to develop a direct relationship with the potential market. It is an important part of the promotional and branding strategy and effectively described the brand’s nature. It gives ease in sharing the business-related information in the public like at conference, workshops and other.

This is image title

Moreover, a quality visiting card printing online provides the impression of products or services. According to the random research, it is stated that most of the customers draw the conclusion about the business and its products from the card quality or its printing. So, a smart business card with the right size and content is essential for the business.

Here are the factors that will help to understand the importance of the business card in the brand promotion or more:

Provide Contact Details:

One of the main reasons behind business card printing is the contact sharing features. The card contains contact details, name, logo, and other related information that helps the client to reach the business. Further, it helps to describe the brand or product nature before approaching the product or services. Other than the technology usage or sharing of the information through devices, business cards are most suitable and a handy item that worth a lot for the customers.

This is image title

The impression of the Brand:

The business card is a source that will deliver the first impression of the brand or business towards the potential buyers. It is something handy with the physical touch that develops a direct relationship with the potential market. While going to print business cards that quality, printing style, and overall outlook matters a lot. Because it works as the first impression of the business and its product or services for the potential market. So, the worthy card made with durable material and have an attractive color combination or layout can capture the interest easily.

It contains the company logo, name, design, and color combination that quickly attain the interest of the audience. On other hand, it is an important factor to pay attention to while making the designing and printing decision about the business card.

Direct Marketing Facility:

No doubt there are multiple marketing and promotional tools are available for the product or business promotion. But engraved business cards online is something incredible and handy that provide the physical touch experience. It works as the marketing or promotional element that helps in sharing the details directly to the potential market. With the more physical interaction that the business cards offer to the buyers and business.

The important thing that has to be considered in making the custom business cards, related to the content adjustment, design, and color combination. It helps to capture the buyer’s interest and deliver the right impression towards them.

This is image title

Appreciated in Different Cultures:

The business cards preferably deliver the right knowledge and impression about the product or services. It described the brand position, nature of the products or services, and other relevant skills. In most cultures, it is appreciated to have and share physical business cards as an information-sharing tool. In face-to-face interaction, develops a network and promotes sharing the business information in a circle.

Ease to Provide a Business Reference:

In business cards, online people find multiple opportunities in designing and Printing Services with a significant impression. It helps to make an easy referral related to particular services and a person with a skill set. The business car not only contains the address, contact information, or brand-related knowledge. It provides details about the particular person and reflects the skill set. Multiple factors truly help to describe the right impression of the brand through color, text, and images.

A tool to Develop Trust:

For business growth and development, it is important to gain the trust level of the customers. With the custom business cards, it is easier to attain the trust of the customers. in the competitive business atmosphere for a business survival trust is the only key, that can be over the product or on a company as well. Through the business card, it is easier to exchange and share personal warmth feelings.

With Business Cards Printing, it is easier to show more graphical representation through colors and design. Moreover, with the physical touch, it is easier to give trust feelings or more.

This is image title

Final Consideration!

In the competitive business world, the business card is a source to deliver information and capture the interest of potential buyers. It helps to impress the audience and provide relevant product details and skills that build trust or act as the direct promotional tool.

#business cards printing #visiting card printing online #go print business cards #engraved business cards online #custom business cards #business cards online

Ian  Robinson

Ian Robinson

1624362840

Sometimes, Big Data can Mislead in Taking Business Decisions

Most of the big data analytics we perform centers around what we expect it to be

“Why is the product unsuccessful? Did we not plan it after going through big data analytics?” asked a company executive. This is not the first company or the first time such confusion has happened. If we take a close look around, most of the data analytics we perform centers around the concept we expect them to be, leading to massive setbacks. Yes, it is true. Even though we praise big data for being the accelerator of every decision, we can’t deny the fact that it can be misleading at times.

Big data is more than just structured and unstructured data. It is seen as a base ingredient of all decision-making processes. For the past two decades, ever since mobile phones came into existence and technology evolved exponentially, It became a critical part of every business operation. Big data in business is a very common substance that executives and employees used to get insights into their market performance. Technology experts are all praises about data, with many touting it as the best thing that has happened to humankind. But the truth is a little twisted. When data is used correctly, it opens the door to double or triple-fold the revenue in minimum time. Unfortunately, it can also be misleading, draining the company’s efforts to go down the gutter. A report by Blazent, an IT intelligence company unravels many findings of big data disadvantages. It shows that around 42% of executives state that misuse of data can impair revenues and 39% said this can be deteriorating for correct decision-making. Henceforth, this article takes you through how big data is misused and what can be done to patch the gap.

#big data #latest news #sometimes, big data can mislead in taking business decisions #business decisions #big data can mislead in taking business decisions

Erstellen einer Crud-Web-App mit Angular | Angular 13 CRUD

Angular CRUD bezeichnet eine Anwendung, die aus Erstellung, Lesen, Aktualisieren und Löschen von Datenfunktionalitäten besteht. Es ist die umfassende Anleitung zum Erstellen von CRUD-Webanwendungen (Create, Read, Update, Delete) mit dem New Angular Framework. Der Angular wurde gerade veröffentlicht und enthält einige neue Funktionen und Verbesserungen.

Zuerst werden wir Angular mit Angular CLI installieren und dann das Frontend und Backend weiterentwickeln.

1: Installieren Sie Angular und andere Abhängigkeiten.

Wenn Sie eine ältere @angular/cli-Version haben, können Sie den folgenden Befehl ausführen, um die neuesten Versionen zu installieren.

npm uninstall -g @angular/cli
npm cache verify
npm install -g @angular/cli

Wenn Sie irgendwelche Probleme haben, lesen Sie bitte mein How To Update Angular CLI To Version 7Es wird Ihnen helfen, Ihre Angular CLI zu aktualisieren , und Sie werden ein brandneues Angular Seven-Projekt erstellen.

Okay, wenn Sie jetzt den folgenden Befehl eingeben, können Sie sehen, dass wir Angular CLI aktualisiert haben.

Angular 7 CRUD-Beispiel |  MEAN-Stack-Tutorial

Jetzt erstellen Sie mit dem folgenden Befehl ein neues Angular-Projekt.

ng new angular7crud
cd angular7crud

MEAN-Stack-CRUD-Beispiel

Nachdem Sie in den Projektordner gegangen sind, öffnen Sie das Projekt in Visual Studio Code mit dem folgenden Befehl. Wenn Sie es nicht verwenden, beginnen Sie damit, es zu verwenden. Es ist der beste Editor für die Javascript- Entwicklung.

code .

Zum Zeitpunkt der Installation haben wir das Routing für unsere Anwendung aktiviert. Es ist neu in Angular  , weil es uns bei der Installation der eckigen Boilerplate auffordert. Sie können die Datei mit dem Namen app-routing.module.ts  im Verzeichnis src >> app überprüfen .

Installieren Sie als Nächstes das Bootstrap 4 CSS Framework mit dem folgenden Befehl.

npm install bootstrap --save

Fügen Sie es jetzt in die  Datei angle.json ein  .

"styles": [
   "src/styles.css",
   "./node_modules/bootstrap/dist/css/bootstrap.min.css"
 ],

Jetzt können wir die Bootstrap 4-Klassen in unserem Projekt verwenden. 

Starten Sie den Angular-Entwicklungsserver mit dem folgenden Befehl.

ng serve -o

 

Angular 7 Komplettlösung

Projektbeschreibung

Wir werden ein Projekt erstellen, bei dem Benutzer ihren Benutzernamen  , Firmennamen  und ihre GST-Nummer aus dem Formular eingeben und absenden können. Wenn die Werte falsch sind, werden sie am Frontend validiert und das Formular wird nicht gesendet. Wenn andererseits alle Werte perfekt erscheinen, senden wir das Formular an die Backend-API und speichern die Werte in der MongoDB- Datenbank.

Also werden wir jetzt einige Winkelkomponenten erstellen, um die Arbeit zu erledigen.

2: Winkelkomponenten erzeugen

Geben Sie den folgenden Befehl ein, um Angular Components zu generieren . Wir führen Erstellungs-, Lese- und Aktualisierungsvorgänge durch. Also werden wir drei Komponenten erstellen.

ng g c gst-add --spec=false
ng g c gst-get --spec=false
ng g c gst-edit --spec=false

Winkel-CRUD-Tutorial

Alle drei Komponenten werden automatisch in einer app.module.ts  - Datei registriert. Wir müssen das Routing von Winkelkomponenten in einer app-routing.module.ts-  Datei konfigurieren.

// app-routing.module.ts

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { GstAddComponent } from './gst-add/gst-add.component';
import { GstEditComponent } from './gst-edit/gst-edit.component';
import { GstGetComponent } from './gst-get/gst-get.component';

const routes: Routes = [
  {
    path: 'business/create',
    component: GstAddComponent
  },
  {
    path: 'business/edit/:id',
    component: GstEditComponent
  },
  {
    path: 'business',
    component: GstGetComponent
  }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})

export class AppRoutingModule { }

Jetzt können Sie in der  Datei app.component.html  sehen , dass die Direktive <router-outlet>  vorhanden ist. Diese Direktive hilft uns beim Rendern der verschiedenen Komponenten basierend auf dem Routen-URI.

3: Erstellen Sie eine Winkelnavigation

Schreiben Sie den folgenden Code in die  Datei app.component.html  .

<nav class="navbar navbar-expand-sm bg-light">
  <div class="container-fluid">
    <ul class="navbar-nav">
      <li class="nav-item">
        <a routerLink="business/create" class="nav-link" routerLinkActive="active">
          Create Business
        </a>
      </li>
      <li class="nav-item">
        <a routerLink="business" class="nav-link" routerLinkActive="active">
          Business
        </a>
      </li> 
    </ul>
  </div>
</nav>

<div class="container">
  <router-outlet></router-outlet>
</div>

Speichern Sie die Datei und gehen Sie zum Browser und klicken Sie auf zwei Links. Sie können sehen, dass wir die verschiedenen Komponenten basierend auf der Navigation sehen können.

4: Installieren Sie die Winkel-Routing-Fortschrittsanzeige.

Geben Sie den folgenden Befehl ein, um die  Bibliothek ng2-slim-loading-bar zu installieren .

npm install ng2-slim-loading-bar --save

Wenn Sie also jetzt Pakete von Drittanbietern installieren, ist es nicht mit Angular kompatibel . Um die Lücke zwischen  Angular  und Paketen von Drittanbietern zu schließen, müssen wir die folgende Bibliothek installieren. Das ist es.

npm install rxjs-compat --save

Importieren Sie nun das  SlimLoadingBarModule  in die  Datei app.module.ts  .

// app.module.ts

import { SlimLoadingBarModule } from 'ng2-slim-loading-bar';

imports: [
    ...
    SlimLoadingBarModule
],

Der nächste Schritt besteht darin, das Styling mit der Bibliothek in die Datei src >> styles.css aufzunehmen  .

@import "../node_modules/ng2-slim-loading-bar/style.css";

5: Hinzufügen von Router-Ereignissen.

Angular RouterModule gibt uns die folgenden Ereignismodule.

  1. NavigationStart
  2. NavigationEnd
  3. Navigationsfehler
  4. NavigationAbbrechen
  5. Router
  6. Fall

Schreiben Sie nun den folgenden Code in die  Datei app.component.ts  .

// app.component.ts

import { Component } from '@angular/core';
import {SlimLoadingBarService} from 'ng2-slim-loading-bar';
import { NavigationCancel,
        Event,
        NavigationEnd,
        NavigationError,
        NavigationStart,
        Router } from '@angular/router';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'angular7crud';
  constructor(private _loadingBar: SlimLoadingBarService, private _router: Router) {
    this._router.events.subscribe((event: Event) => {
      this.navigationInterceptor(event);
    });
  }
  private navigationInterceptor(event: Event): void {
    if (event instanceof NavigationStart) {
      this._loadingBar.start();
    }
    if (event instanceof NavigationEnd) {
      this._loadingBar.complete();
    }
    if (event instanceof NavigationCancel) {
      this._loadingBar.stop();
    }
    if (event instanceof NavigationError) {
      this._loadingBar.stop();
    }
  }
}

Es fängt das Routing-Ereignis ab und fügt die Ladebalkenkomponente zu jeder Route hinzu, sodass wir die Routing-Anzeige jedes Mal sehen können, wenn wir die Routen ändern.

Die letzte Änderung zur Anzeige des Routing-Indikators besteht darin, die Direktive ng2-slim-loading-bar in der  Datei app.component.html  oben auf der Seite hinzuzufügen.

<ng2-slim-loading-bar color="blue"></ng2-slim-loading-bar>

<nav class="navbar navbar-expand-sm bg-light">
  <div class="container-fluid">
    <ul class="navbar-nav">
      <li class="nav-item">
        <a routerLink="business/create" class="nav-link" routerLinkActive="active">
          Create Business
        </a>
      </li>
      <li class="nav-item">
        <a routerLink="business" class="nav-link" routerLinkActive="active">
          Business
        </a>
      </li> 
    </ul>
  </div>
</nav>

<div class="container">
  <router-outlet></router-outlet>
</div>

Speichern Sie die Datei und gehen Sie zum Terminal, um zu sehen, ob ein Fehler vorliegt, und wenn nicht, gehen Sie zum Browser und ändern Sie die Routen, und Sie können sehen, dass wir jetzt die Routing-Anzeige sehen können.

6: Bootstrap-Formular hinzufügen

Fügen Sie in der Datei gst  -add.component.html  das folgende  Bootstrap-4 - Formular hinzu.

<div class="card">
  <div class="card-body">
    <form>
      <div class="form-group">
        <label class="col-md-4">Person Name</label>
        <input type="text" class="form-control" />
      </div>
      <div class="form-group">
        <label class="col-md-4">Business Name </label>
        <input type="text" class="form-control" />
      </div>
      <div class="form-group">
        <label class="col-md-4">Business GST Number </label>
        <input type="text" class="form-control" />
      </div>
      <div class="form-group">
        <button type="submit" class="btn btn-primary">Add Business</button>
      </div>
    </form>
  </div>
</div>

Angular 7 CRUD-Demo

7: Angular-Form-Validierung hinzufügen

Wir werden ReactiveFormsModule verwenden . Wenn Sie neu bei der Angular Form Validation sind , lesen Sie bitte diesen Artikel Angular Form Validation  in diesem Blog.

Importieren Sie nun das  ReactiveFormsModule  in die  Datei app.module.ts  .

// app.module.ts

import { ReactiveFormsModule } from '@angular/forms';

imports: [
    ...
    ReactiveFormsModule
],

Jetzt müssen wir den Code für die  Datei app.component.ts  schreiben . Denken Sie daran, dass dies kein vorlagengesteuertes Formular ist. Also werden wir den Code in der Datei app.component.ts ändern  .

Zuerst importieren wir die  Module FormGroup, FormBuilder, Validators  aus  @angular/forms .

Erstellen Sie außerdem einen Konstruktor und instanziieren Sie den  FormBuilder .

Schreiben Sie also den folgenden Code in die  Datei gst-add.component.ts  .

// gst-add.component.ts

import { Component, OnInit } from '@angular/core';
import { FormGroup,  FormBuilder,  Validators } from '@angular/forms';

@Component({
  selector: 'app-gst-add',
  templateUrl: './gst-add.component.html',
  styleUrls: ['./gst-add.component.css']
})
export class GstAddComponent implements OnInit {

  angForm: FormGroup;
  constructor(private fb: FormBuilder) {
    this.createForm();
  }

  createForm() {
    this.angForm = this.fb.group({
      person_name: ['', Validators.required ],
      business_name: ['', Validators.required ],
      business_gst_number: ['', Validators.required ]
    });
  }

  ngOnInit() {
  }

}

Wir haben den Form Builder verwendet, um die gesamte Validierung durchzuführen. In diesem Konstruktor erstellen wir also ein Formular mit den Validierungsregeln. In unserem Beispiel gibt es drei Felder. Wenn der Eingabetext leer ist, wird ein Fehler ausgegeben und wir müssen ihn anzeigen.

Schreiben Sie nun den folgenden Code in die  Datei gst-add.component.html  .

<div class="card">
  <div class="card-body">
    <form [formGroup]="angForm" novalidate>
      <div class="form-group">
        <label class="col-md-4">Person Name</label>
        <input type="text" class="form-control" formControlName="person_name" #person_name />
      </div>
      <div *ngIf="angForm.controls['person_name'].invalid && (angForm.controls['person_name'].dirty || angForm.controls['person_name'].touched)" class="alert alert-danger">
        <div *ngIf="angForm.controls['person_name'].errors.required">
          Person Name is required.
        </div>
      </div>
      <div class="form-group">
        <label class="col-md-4">Business Name </label>
        <input type="text" class="form-control" formControlName="business_name" #business_name />
      </div>
      <div *ngIf="angForm.controls['business_name'].invalid && (angForm.controls['business_name'].dirty || angForm.controls['business_name'].touched)" class="alert alert-danger">
        <div *ngIf="angForm.controls['business_name'].errors.required">
          Person Business is required.
        </div>
      </div>
      <div class="form-group">
        <label class="col-md-4">Business GST Number </label>
        <input type="text" class="form-control" formControlName="business_gst_number" #business_gst_number />
      </div>
      <div *ngIf="angForm.controls['business_gst_number'].invalid && (angForm.controls['business_gst_number'].dirty || angForm.controls['business_gst_number'].touched)" class="alert alert-danger">
        <div *ngIf="angForm.controls['business_gst_number'].errors.required">
          Business GST Number is required.
        </div>
      </div>
      <div class="form-group">
        <button type="submit" 
        [disabled]="angForm.pristine || angForm.invalid" 
        class="btn btn-primary">Add Business</button>
      </div>
    </form>
  </div>
</div>

Speichern Sie die Datei und gehen Sie zum Browser, und Sie können sehen, wenn Sie keinen Wert in das Eingabefeld eingeben, sehen Sie die Fehler.

Beispiel für die Angular 7-Formularvalidierung

8: Konfigurieren Sie das HttpClientModule

Importieren Sie das  HttpClientModule  in die  Datei app.module.ts  .

// app.module.ts

import { HttpClientModule } from '@angular/common/http';

imports: [
   ...
    HttpClientModule
 ],

9: Erstellen Sie ein Modell.

Erstellen Sie im  App  -Ordner src >> eine Datei mit dem Namen  Business.ts  und fügen Sie den folgenden Code hinzu.

// Business.ts

export default class Business {
  person_name: String;
  business_name: String;
  business_gst_number: Number;
}

10: Erstellen Sie eine Angular-Service-Datei.

Geben Sie den folgenden Befehl ein, um die Dienstdatei zu generieren.

ng g service business --spec=false

Ihre primäre  business.service.ts  -Datei sieht also so aus.

// business.service.ts

import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root'
})
export class BusinessService {

  constructor() { }
}

Importieren Sie nun die  Datei business.service.ts  in die  Datei app.module.ts  .

// app.module.ts

import { BusinessService } from './business.service';

providers: [ BusinessService ],

11: Senden Sie die Daten an den Knotenserver

Wir müssen den Code schreiben, der die HTTP -POST-Anforderung mit den Daten an den Node.js -Server sendet, und die Daten in der MongoDB - Datenbank speichern.

Schreiben Sie den folgenden Code in die  Datei business.service.ts  .

// business.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Injectable({
  providedIn: 'root'
})
export class BusinessService {

  uri = 'http://localhost:4000/business';

  constructor(private http: HttpClient) { }

  addBusiness(person_name, business_name, business_gst_number) {
    const obj = {
      person_name: person_name,
      business_name: business_name,
      business_gst_number: business_gst_number
    };
    console.log(obj);
    this.http.post(`${this.uri}/add`, obj)
        .subscribe(res => console.log('Done'));
  }
}

Wir haben unsere Backend-API-URL definiert, aber wir haben noch kein Backend erstellt, aber wir werden es in ein paar Schritten tun.

Wir müssen das Click-Ereignis zum Add Business Button hinzufügen. Fügen Sie also den folgenden Code in die Datei gst-add.component.html ein  .

<div class="form-group">
    <button (click)="addBusiness(person_name.value, business_name.value, business_gst_number.value)"
        [disabled]="angForm.pristine || angForm.invalid" 
        class="btn btn-primary">
        Add Business
     </button>
</div>

Wenn also keine Fehler vorliegen, können wir das Formular absenden, und es ruft die  addBusiness  - Funktion der Komponente auf. Von dort aus rufen wir den Winkeldienst auf, und der Dienst sendet die HTTP - Post-Anfrage an den Node.js -Server.

Fügen Sie nun die  Funktion addBusiness in der  Datei  gst-add.component.ts hinzu  . Schreiben Sie also den folgenden Code in  die Datei gst-add.component.ts  .

// gst-add.component.ts

import { Component, OnInit } from '@angular/core';
import { FormGroup,  FormBuilder,  Validators } from '@angular/forms';
import { BusinessService } from '../business.service';

@Component({
  selector: 'app-gst-add',
  templateUrl: './gst-add.component.html',
  styleUrls: ['./gst-add.component.css']
})
export class GstAddComponent implements OnInit {

  angForm: FormGroup;
  constructor(private fb: FormBuilder, private bs: BusinessService) {
    this.createForm();
  }

  createForm() {
    this.angForm = this.fb.group({
      person_name: ['', Validators.required ],
      business_name: ['', Validators.required ],
      business_gst_number: ['', Validators.required ]
    });
  }

  addBusiness(person_name, busines_name, business_gst_number) {
    this.bs.addBusiness(person_name, busines_name, business_gst_number);
  }

  ngOnInit() {
  }

}

Hier haben wir die Funktion definiert und auch die  Datei business.service.ts  importiert. Instanziieren Sie als Nächstes das Objekt im Konstruktor und rufen Sie die Funktion der Datei businness.service.ts auf .

Wir haben die  Funktion  addBusiness  bereits in der Datei business.service.ts  codiert . Jetzt müssen wir die Backend-API konfigurieren.

12: Erstellen Sie eine Node.js-Backend-API

Erstellen Sie im eckigen Stammordner einen Ordner mit dem Namen api und gehen Sie in diesen Ordner. Denken Sie daran, dass es ein völlig separates Projekt von Angular sein wird. Seine node_modules unterscheiden sich also von einem Angular .

Öffnen Sie das Terminal im  API  -Ordner und geben Sie den folgenden Befehl ein.

npm init -y

Installieren Sie die folgenden knotenspezifischen Module.

npm install --save express body-parser cors mongoose

Ich starte den Knotenserver nicht jedes Mal neu; Ich ändere die Datei. Also installiere ich den Nodemon-Server. Wenn ich die Datei  server.js ändere  , wird der node.js-Server  automatisch neu gestartet.

npm install nodemon --save-dev

Erstellen Sie nun im  api  -Ordner eine Datei namens  server.js  .

// server.js

const express = require('express'),
    path = require('path'),
    bodyParser = require('body-parser'),
    cors = require('cors'),
    mongoose = require('mongoose');

    const app = express();
    let port = process.env.PORT || 4000;

    const server = app.listen(function(){
        console.log('Listening on port ' + port);
    });

Als Nächstes verbinden Sie die MongoDB-Datenbank mit unserer node.js-Anwendung.

Wenn Sie die MongoDB-Datenbank nicht installiert haben, installieren Sie sie und starten Sie den MongoDB-Server.

Geben Sie den folgenden Befehl ein, um den  MongoDB  -Server zu starten.

mongod

Also, jetzt habe ich mich mit der Datenbank verbunden.

Erstellen Sie eine Datei mit dem Namen  DB.js  im  API  -Root-Projektordner. Schreiben Sie dann den folgenden Code in die Datei DB.js. 

// DB.js

module.exports = {
    DB: 'mongodb://localhost:27017/ng7crud'
 };

Importieren Sie diese  DB.js  -Datei in unsere  server.js -Datei und verwenden Sie die  Mongoose-Bibliothek , um die Datenbankverbindung  mit  MongoDB  einzurichten  . Wir können Mongoose auch verwenden, um die Daten mit Mongoose ORM in der Datenbank zu speichern.

Schreiben Sie den folgenden Code in die Datei server.js  , um unsere  MongoDB  - Anwendung mit dem  Node.js  -Server zu verbinden.

// server.js

const express = require('express'),
    path = require('path'),
    bodyParser = require('body-parser'),
    cors = require('cors'),
    mongoose = require('mongoose'),
    config = require('./DB');

    mongoose.Promise = global.Promise;
    mongoose.connect(config.DB, { useNewUrlParser: true }).then(
      () => {console.log('Database is connected') },
      err => { console.log('Can not connect to the database'+ err)}
    );

    const app = express();
    app.use(bodyParser.json());
    app.use(cors());
    const port = process.env.PORT || 4000;

    const server = app.listen(port, function(){
     console.log('Listening on port ' + port);
    });

Speichern Sie die Datei und gehen Sie zum Terminal und starten Sie den Knotenserver.

nodemon server

Im Moment laufen also drei Server.

  1. Angular-Entwicklungsserver
  2. Nodemon-Server
  3. MongoDB-Server

Denken Sie daran, dass alle drei Server ohne Fehler laufen; Andernfalls funktioniert unsere Anwendung nicht.

Schritt 13: Erstellen Sie ein Modell und Routen für unsere Anwendung.

Wir müssen zwei Ordner im API -Stammordner mit den Namen routen und models erstellen .

Erstellen Sie im Ordner der Modelle  ein Modell namens  Business.js.

// Business.js

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

// Define collection and schema for Business
let Business = new Schema({
  person_name: {
    type: String
  },
  business_name: {
    type: String
  },
  business_gst_number: {
    type: Number
  }
},{
    collection: 'business'
});

module.exports = mongoose.model('Business', Business);

Wir haben also unser Schema für die Business-Sammlung definiert. Wir haben drei Felder namens  person_name, business_name, business_gst_number.

Erstellen Sie im  Routenordner  eine Datei namens business.route.js.

Schreiben Sie den CRUD-Code in die  Datei business.route.js  .

// business.route.js

const express = require('express');
const app = express();
const businessRoutes = express.Router();

// Require Business model in our routes module
let Business = require('../models/Business');

// Defined store route
businessRoutes.route('/add').post(function (req, res) {
  let business = new Business(req.body);
  business.save()
    .then(business => {
      res.status(200).json({'business': 'business in added successfully'});
    })
    .catch(err => {
    res.status(400).send("unable to save to database");
    });
});

// Defined get data(index or listing) route
businessRoutes.route('/').get(function (req, res) {
    Business.find(function (err, businesses){
    if(err){
      console.log(err);
    }
    else {
      res.json(businesses);
    }
  });
});

// Defined edit route
businessRoutes.route('/edit/:id').get(function (req, res) {
  let id = req.params.id;
  Business.findById(id, function (err, business){
      res.json(business);
  });
});

//  Defined update route
businessRoutes.route('/update/:id').post(function (req, res) {
    Business.findById(req.params.id, function(err, next, business) {
    if (!business)
      return next(new Error('Could not load Document'));
    else {
        business.person_name = req.body.person_name;
        business.business_name = req.body.business_name;
        business.business_gst_number = req.body.business_gst_number;

        business.save().then(business => {
          res.json('Update complete');
      })
      .catch(err => {
            res.status(400).send("unable to update the database");
      });
    }
  });
});

// Defined delete | remove | destroy route
businessRoutes.route('/delete/:id').get(function (req, res) {
    Business.findByIdAndRemove({_id: req.params.id}, function(err, business){
        if(err) res.json(err);
        else res.json('Successfully removed');
    });
});

module.exports = businessRoutes;

Wir haben das Mungo-Modell verwendet, um die Datenbank zu speichern, zu aktualisieren und zu löschen. Mongoose ist ein ORM , das in der MongoDB - Datenbank verwendet wird. Wir haben alle CRUD-Operationen in der Routendatei eingerichtet; Wir müssen sie in die Datei server.js  importieren .

Unsere endgültige  server.js  -Datei sieht also so aus.

// server.js

const express = require('express'),
    path = require('path'),
    bodyParser = require('body-parser'),
    cors = require('cors'),
    mongoose = require('mongoose'),
    config = require('./DB');

const businessRoute = require('./routes/business.route');
mongoose.Promise = global.Promise;
mongoose.connect(config.DB, { useNewUrlParser: true }).then(
  () => {console.log('Database is connected') },
  err => { console.log('Can not connect to the database'+ err)}
);

const app = express();
app.use(bodyParser.json());
app.use(cors());
app.use('/business', businessRoute);
const port = process.env.PORT || 4000;

const server = app.listen(port, function(){
  console.log('Listening on port ' + port);
});

Schritt 14: Testen Sie die Funktionalität zum Speichern von Daten

Wenn alle Server betriebsbereit sind, können Sie zum Browser gehen, die Formulardaten ausfüllen und das Unternehmen hinzufügen. Sie können so etwas auf Ihrem Bildschirm sehen, wenn Sie erfolgreich sind.

Jetzt können wir die Datenbank mit den folgenden Befehlen überprüfen.

Öffnen Sie zuerst die Mongo-Shell auf dem 4. Tab, da alle anderen drei Tabs im Moment belegt sind.

mongo

Hier können wir sehen, dass die Werte in der MongoDB-Datenbank gespeichert sind. Ja!! Es ist uns gelungen.

Jetzt sind die verbleibenden Operationen Lesen, Aktualisieren und Löschen.

15: Anzeige der Daten im Frontend

Schreiben Sie in die gst-get.component.html-  Datei den folgenden Code.

<table class="table table-hover">
  <thead>
  <tr>
      <td>Person Name</td>
      <td>Business Name</td>
      <td>GST Number</td>
      <td colspan="2">Actions</td>
  </tr>
  </thead>

  <tbody>
      <tr *ngFor="let business of businesses">
          <td>{{ business.person_name }}</td>
          <td>{{ business.business_name }}</td>
          <td>{{ business.business_gst_number }}</td>
          <td><a [routerLink]="['/edit', business._id]" class="btn btn-primary">Edit</a></td>
          <td><a [routerLink]="" class="btn btn-danger">Delete</a></td>
      </tr>
  </tbody>
</table>

Jetzt müssen wir in der  Datei business.service.ts  die Funktion schreiben, die die Geschäftsdaten aus der  MongoDB - Datenbank abruft und sie in der Angular-Anwendung anzeigt .

// business.service.ts

getBusinesses() {
    return this
           .http
           .get(`${this.uri}`);
  }

Wir müssen diese business.service.ts  -Datei und die Business.ts  - Datei in die  gst-get.component.ts-  Datei aufnehmen.

Schreiben Sie den folgenden Code in die  Datei gst-get.component.ts  .

// gst-get.component.ts

import { Component, OnInit } from '@angular/core';
import Business from '../Business';
import { BusinessService } from '../business.service';

@Component({
  selector: 'app-gst-get',
  templateUrl: './gst-get.component.html',
  styleUrls: ['./gst-get.component.css']
})
export class GstGetComponent implements OnInit {

  businesses: Business[];

  constructor(private bs: BusinessService) { }

  ngOnInit() {
    this.bs
      .getBusinesses()
      .subscribe((data: Business[]) => {
        this.businesses = data;
    });
  }
}

Speichern Sie die Datei, gehen Sie zum Browser und wechseln Sie zu dieser URL:  http://localhost:4200/business. Sie können die Liste der Unternehmen sehen.

16: Daten bearbeiten und aktualisieren

Okay, zuerst müssen wir die Daten mit _id wise aus der MongoDB-Datenbank abrufen und diese Daten in der Datei gst-edit.component.html anzeigen  .

Schreiben Sie also zuerst den folgenden Code in die  Datei gst-edit.component.ts  .

// gst-edit.component.ts

import { Component, OnInit } from '@angular/core';
import { ActivatedRoute, Router } from '@angular/router';
import { FormGroup,  FormBuilder,  Validators } from '@angular/forms';
import { BusinessService } from '../business.service';

@Component({
  selector: 'app-gst-edit',
  templateUrl: './gst-edit.component.html',
  styleUrls: ['./gst-edit.component.css']
})
export class GstEditComponent implements OnInit {

  business: any = {};
  angForm: FormGroup;

  constructor(private route: ActivatedRoute,
    private router: Router,
    private bs: BusinessService,
    private fb: FormBuilder) {
      this.createForm();
 }

  createForm() {
    this.angForm = this.fb.group({
        person_name: ['', Validators.required ],
        business_name: ['', Validators.required ],
        business_gst_number: ['', Validators.required ]
      });
    }


  ngOnInit() {
    this.route.params.subscribe(params => {
        this.bs.editBusiness(params['id']).subscribe(res => {
          this.business = res;
      });
    });
  }
}

Hier wird beim Rendern der  gst-edit-Komponente.ts  die  ngOnInit  - Methode aufgerufen und eine HTTP-Anforderung an den Knotenserver gesendet und die Daten von einer _id abgerufen , um sie in der  gst-edit.component.html-  Datei anzuzeigen.

Jetzt  müssen wir in der Datei business.service.ts die  Funktion  editBusiness codieren  , um eine HTTP-Anforderung zu senden.

// business.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Injectable({
  providedIn: 'root'
})
export class BusinessService {

  uri = 'http://localhost:4000/business';

  constructor(private http: HttpClient) { }

  addBusiness(person_name, business_name, business_gst_number) {
    const obj = {
      person_name: person_name,
      business_name: business_name,
      business_gst_number: business_gst_number
    };
    this.http.post(`${this.uri}/add`, obj)
        .subscribe(res => console.log('Done'));
  }

  getBusinesses() {
    return this
           .http
           .get(`${this.uri}`);
  }

  editBusiness(id) {
    return this
            .http
            .get(`${this.uri}/edit/${id}`);
    }
}

Schließlich müssen wir das Formular in die Datei gst-edit.component.html  schreiben .

<div class="card">
  <div class="card-body">
    <form [formGroup]="angForm" novalidate>
      <div class="form-group">
        <label class="col-md-4">Person Name</label>
        <input type="text" class="form-control" formControlName="person_name" #person_name [(ngModel)] = "business.person_name" />
      </div>
      <div *ngIf="angForm.controls['person_name'].invalid && (angForm.controls['person_name'].dirty || angForm.controls['person_name'].touched)" class="alert alert-danger">
        <div *ngIf="angForm.controls['person_name'].errors.required">
          Person Name is required.
        </div>
      </div>
      <div class="form-group">
        <label class="col-md-4">Business Name </label>
        <input type="text" class="form-control" formControlName="business_name" #business_name [(ngModel)] = "business.business_name" />
      </div>
      <div *ngIf="angForm.controls['business_name'].invalid && (angForm.controls['business_name'].dirty || angForm.controls['business_name'].touched)" class="alert alert-danger">
        <div *ngIf="angForm.controls['business_name'].errors.required">
          Person Business is required.
        </div>
      </div>
      <div class="form-group">
        <label class="col-md-4">Business GST Number </label>
        <input type="text" class="form-control" formControlName="business_gst_number" #business_gst_number [(ngModel)] = "business.business_gst_number" />
      </div>
      <div *ngIf="angForm.controls['business_gst_number'].invalid && (angForm.controls['business_gst_number'].dirty || angForm.controls['business_gst_number'].touched)" class="alert alert-danger">
        <div *ngIf="angForm.controls['business_gst_number'].errors.required">
          Business GST Number is required.
        </div>
      </div>
      <div class="form-group">
        <button (click)="updateBusiness(person_name.value, business_name.value, business_gst_number.value)"
        [disabled]="angForm.invalid" 
        class="btn btn-primary">Update Business</button>
      </div>
    </form>
  </div>
</div>

Speichern Sie die Datei, gehen Sie zur Auflistungsseite, klicken Sie auf die Schaltfläche „Bearbeiten“ und sehen Sie sich das ausgefüllte Formular aus der Datenbank an.

Sie können die Warnung auch wie folgt sehen. Ignorieren Sie dieses Demo-Tutorial.

forms.js:1193 Anscheinend
verwenden Sie ngModel für dasselbe Formularfeld wie formControlName.
Die Unterstützung für die Verwendung der ngModel-Eingabeeigenschaft und des ngModelChange-Ereignisses mit
reaktiven Formulardirektiven wurde in Angular v6 eingestellt und
in Angular v7 entfernt.

Aktualisieren Sie nun die Daten. In die Datei  business.service.ts  müssen wir die Funktion schreiben, die die Daten aktualisiert.

// business.service.ts

updateBusiness(person_name, business_name, business_gst_number, id) {

    const obj = {
        person_name: person_name,
        business_name: business_name,
        business_gst_number: business_gst_number
      };
    this
      .http
      .post(`${this.uri}/update/${id}`, obj)
      .subscribe(res => console.log('Done'));
  }

Okay, schreiben Sie jetzt die  Funktion updateBusiness()  in die Datei gst-edit.component.ts  .

// gst-edit.component.ts

updateBusiness(person_name, business_name, business_gst_number) {
   this.route.params.subscribe(params => {
      this.bs.updateBusiness(person_name, business_name, business_gst_number, params['id']);
      this.router.navigate(['business']);
});

Speichern Sie die Datei, und Sie können die Daten aktualisieren.

17: Löschen Sie die Daten.

Wenn Sie also keinen Fehler auf der Konsole finden, können Sie die Daten erfolgreich aktualisieren.

Ich habe bereits einen Bearbeitungs-  und  Aktualisierungsdienst  geschrieben , um API-Aufrufe durchzuführen. Bis jetzt ist Erstellen, Lesen, Aktualisieren  dieses  Angular-CRUD-Beispiels abgeschlossen . Sehen Sie sich jetzt  Delete an .

Wir müssen das Klickereignis auf der Schaltfläche „Löschen “ in der Datei  „gst-get.component.html  “ definieren .

<tr *ngFor="let business of businesses">
          <td>{{ business.person_name }}</td>
          <td>{{ business.business_name }}</td>
          <td>{{ business.business_gst_number }}</td>
          <td><a [routerLink]="['edit', business._id]" class="btn btn-primary">Edit</a></td>
          <td><a (click) = "deleteBusiness(business._id)" class="btn btn-danger">Delete</a></td>
</tr>

Schreiben Sie nun die  Funktion  deleteBusiness in die  Datei gst-get.component.ts  .

// gst-get.component.ts

deleteBusiness(id) {
    this.bs.deleteBusiness(id).subscribe(res => {
      console.log('Deleted');
    });
  }

Erstellen Sie abschließend die Funktion deleteBusiness()  in der Datei business.service.ts  .

// business.service.ts

deleteBusiness(id) {
    return this
              .http
              .get(`${this.uri}/delete/${id}`);
  }

Schließlich habe ich die Löschfunktion abgeschlossen.

In diesem Tutorial haben wir also die CRUD-Funktionalität in Angular abgeschlossen.