1641536955
Angular FormArray | Aprenda sobre Angular FormArray com Exemplo
O FormArrayé uma forma de gerenciar a coleção de controles de formulário no Angular. Os controles podem ser um FormGroup, FormControlou outro FormArray.
Podemos agrupar controles de formulário em formas angulares de duas maneiras. Um está usando o FormGroupe o outro está FormArray. A diferença é como eles o implementam. Em FormGroupcontroles torna-se propriedade de FormGroup. Cada controle é representado como um par de valores-chave. Enquanto em FormArray, os controles se tornam parte de uma matriz
Por ser implementado como um Array, é mais fácil adicionar controles dinamicamente.
Exemplo de FormArray
Vamos construir um aplicativo simples, que nos permite adicionar a nova habilidade de uma pessoa de forma dinâmica.
Importar FormArray
Para usar FormArray, primeiro, você precisa importar o FormArraydo Módulo de Formulários Angular.
import { FormGroup, FormControl,FormArray, FormBuilder } from '@angular/forms'Construir um modelo de formulário
Construa um modelo de formulário skillsFormusando o FormBuilder. Nosso formulário possui dois campos. nameda pessoa e dele skills. Uma vez que a pessoa pode ter mais de uma habilidade, definimos skillscomo FormArray.
skillsForm: FormGroup;
constructor(private fb:FormBuilder) {
this.skillsForm = this.fb.group({
name: '',
skills: this.fb.array([]) ,
});
}Em seguida, um gettermétodo skills, que retorna o skillsFormArray doskillsForm
get skills() : FormArray {
return this.skillsForm.get("skills") as FormArray
}A habilidade FormGroup
Precisamos capturar dois campos em cada habilidade. Nome dos skill& anos de exp. Portanto, criamos um FormGroupcom dois campos. O método newSkillcria um novo FormGroupe o retorna. Observe que não poderemos atribuir um nome ao Grupo de formulários.
newSkill(): FormGroup {
return this.fb.group({
skill: '',
exp: '',
})
}Adicionando habilidade dinamicamente
Agora, precisamos adicionar uma nova habilidade ao skillsFormArray. Como é um array, podemos usar o pushmétodo para adicionar a nova habilidade usando o newSkillmétodo. Observe que o newSkill()método retorna a FormGroup. O nome de FormGroupé seu índice no FormArray.
addSkills() {
this.skills.push(this.newSkill());
}Removendo habilidades dinamicamente
Use o removeAtmétodo para remover o elemento do skillsFromArray.
removeSkill(i:number) {
this.skills.removeAt(i);
}Enviar
onSubmit() {
console.log(this.skillsForm.value);
}Modelo
Agora é hora de construir o modelo. Use o [formGroup]="skillsForm"para vincular o formulário ao skillsFormmodelo. A formControlName="name"diretiva vincula o nameelemento de entrada à namepropriedade doskillsForm
<form [formGroup]="skillsForm" (ngSubmit)="onSubmit()">
<p>
<label for="name">Name </label>
<input type="text" id="name" name="name" formControlName="name">
</p>
<p>
<button type="submit">Submit</button>
</p>
</form>Vinculando FormArray ao Modelo
Usamos a formArrayNamediretiva para vincular o skillsarray do formulário ao divelemento. Agora, o dive qualquer coisa dentro do divelemento está vinculado ao skillsarray do formulário.
<div formArrayName="skills">
</div>Dentro do divuse ngForpara percorrer cada elemento de skillsFormArray. let i=indexirá armazenar o indexvalor do array na variável local do template i. Faremos uso dele para remover o elemento do skillsarray.
<div formArrayName="skills">
<div *ngFor="let skill of skills().controls; let i=index">
</div>
</div>Cada elemento sob o skillsé um FormGroup. Não temos um nome para o FormGroup. O Índice do elemento é atribuído automaticamente como o nome do elemento.
Portanto, usamos o [formGroupName]="i"where ié o índice do FormArray para vincular o FormGroupao divelemento.
<div formArrayName="skills">
<div *ngFor="let skill of skills().controls; let i=index">
<div [formGroupName]="i">
</div>
</div>
</div>Finalmente, adicionamos os controles usando a formControlNamediretiva.
Skills:
<div formArrayName="skills">
<div *ngFor="let skill of skills().controls; let i=index">
<div [formGroupName]="i">
{{i}}
skill name :
<input type="text" formControlName="skill">
exp:
<input type="text" formControlName="exp">
<button (click)="removeSkill(i)">Remove</button>
</div>
</div>
</div>Além disso, passe o índice ipararemoveSkill
<button (click)="removeSkill(i)">Remove</button>Finalmente, chame o addSkillsmétodo para adicionar novas habilidades.
<p>
<button type="button" (click)="addSkills()">Add</button>
</p>É isso
Angular FormArray Exemplo em execução de aplicativo
Código fonte
app.component.ts
import { Component, ViewChild, ElementRef } from '@angular/core';
import { FormGroup, FormControl,FormArray, FormBuilder } from '@angular/forms'
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
title = 'FormArray Example in Angular Reactive forms';
skillsForm: FormGroup;
constructor(private fb:FormBuilder) {
this.skillsForm = this.fb.group({
name: '',
skills: this.fb.array([]) ,
});
}
get skills() : FormArray {
return this.skillsForm.get("skills") as FormArray
}
newSkill(): FormGroup {
return this.fb.group({
skill: '',
exp: '',
})
}
addSkills() {
this.skills.push(this.newSkill());
}
removeSkill(i:number) {
this.skills.removeAt(i);
}
onSubmit() {
console.log(this.skillsForm.value);
}
}
export class country {
id: string;
name: string;
constructor(id: string, name: string) {
this.id = id;
this.name = name;
}
}app.component.html
<form [formGroup]="skillsForm" (ngSubmit)="onSubmit()">
<p>
<label for="name">Name </label>
<input type="text" id="name" name="name" formControlName="name">
</p>
Skills:
<div formArrayName="skills">
<div *ngFor="let skill of skills().controls; let i=index">
<div [formGroupName]="i">
{{i}}
skill name :
<input type="text" formControlName="skill">
exp:
<input type="text" formControlName="exp">
<button (click)="removeSkill(i)">Remove</button>
</div>
</div>
</div>
<p>
<button type="submit">Submit</button>
</p>
</form>
<p>
<button type="button" (click)="addSkills()">Add</button>
</p>
{{this.skillsForm.value | json}}What is GEEK
Buddha Community
1598940617
Install Angular - Angular Environment Setup Process
Angular is a TypeScript based framework that works in synchronization with HTML, CSS, and JavaScript. To work with angular, domain knowledge of these 3 is required.
- Installing Node.js and npm
- Installing Angular CLI
- Creating workspace
- Deploying your First App
In this article, you will get to know about the Angular Environment setup process. After reading this article, you will be able to install, setup, create, and launch your own application in Angular. So let’s start!!!
Install Angular in Easy Steps
For Installing Angular on your Machine, there are 2 prerequisites:
- Node.js
- npm Package Manager
Node.js
First you need to have Node.js installed as Angular require current, active LTS or maintenance LTS version of Node.js
Download and Install Node.js version suitable for your machine’s operating system.
Npm Package Manager
Angular, Angular CLI and Angular applications are dependent on npm packages. By installing Node.js, you have automatically installed the npm Package manager which will be the base for installing angular in your system. To check the presence of npm client and Angular version check of npm client, run this command:
- npm -v
Installing Angular CLI
- Open Terminal/Command Prompt
- To install Angular CLI, run the below command:
- npm install -g @angular/cli
· After executing the command, Angular CLI will get installed within some time. You can check it using the following command
- ng --version
Workspace Creation
Now as your Angular CLI is installed, you need to create a workspace to work upon your application. Methods for it are:
- Using CLI
- Using Visual Studio Code
1. Using CLI
To create a workspace:
- Navigate to the desired directory where you want to create your workspace using cd command in the Terminal/Command prompt
- Then in the directory write this command on your terminal and provide the name of the app which you want to create. In my case I have mentioned DataFlair:
- Ng new YourAppName
- After running this command, it will prompt you to select from various options about the CSS and other functionalities.
- To leave everything to default, simply press the Enter or the Return key.
#angular tutorials #angular cli install #angular environment setup #angular version check #download angular #install angular #install angular cli
1593184320
Basics of Angular: Part-1
What is Angular? What it does? How we implement it in a project? So, here are some basics of angular to let you learn more about angular.
Angular is a Typescript-based open-source front-end web application platform. The Angular Team at Google and a community of individuals and corporations lead it. Angular lets you extend HTML’s syntax to express your apps’ components clearly. The angular resolves challenges while developing a single page and cross-platform applications. So, here the meaning of the single-page applications in angular is that the index.html file serves the app. And, the index.html file links other files to it.
We build angular applications with basic concepts which are NgModules. It provides a compilation context for components. At the beginning of an angular project, the command-line interface provides a built-in component which is the root component. But, NgModule can add a number of additional components. These can be created through a template or loaded from a router. This is what a compilation context about.
What is a Component in Angular?
Components are key features in Angular. It controls a patch of the screen called a view. A couple of components that we create on our own helps to build a whole application. In the end, the root component or the app component holds our entire application. The component has its business logic that it does to support the view inside the class. The class interacts with the view through an API of properties and methods. All the components added by us in the application are not linked to the index.html. But, they link to the app.component.html through the selectors. A component can be a component and not only a typescript class by adding a decorator @Component. Then, for further access, a class can import it. The decorator contains some metadata like selector, template, and style. Here’s an example of how a component decorator looks like:
@Component({
selector: 'app-root',
templateUrl: 'app.component.html',
styleUrls: ['app.component.scss']
})
Role of App Module
Modules are the package of functionalities of our app. It gives Angular the information about which features does my app has and what feature it uses. It is an empty Typescript class, but we transform it by adding a decorator @NgModule. So, we have four properties that we set up on the object pass to @NgModule. The four properties are declarations, imports, providers, and bootstrap. All the built-in new components add up to the declarations array in @NgModule.
@NgModule({
declarations: [
AppComponent,
],
imports: [
BrowserModule,
HttpClientModule,
AppRoutingModule,
FormsModule
],
bootstrap: [AppComponent]
})
What is Data Binding?
Data Binding is the communication between the Typescript code of the component and the template. So, we have different kinds of data binding given below:
- When there is a requirement to output data from our Typescript code in the HTML template. String interpolation handles this purpose like {{data}} in HTML file. Property Binding is also used for this purpose like [property] = “data”.
- When we want to trigger any event like clicking a button. Event Binding works while we react to user events like (event) = “expression”.
- When we can react to user events and output something at the same time. Two-way Binding is used like [(ngModel)] = “data”.
#angular #javascript #tech blogs #user interface (ui) #angular #angular fundamentals #angular tutorial #basics of angular
1624138795
Angular Material Autocomplete - Multiple Use Cases covered
Learn How to use Angular Material Autocomplete Suggestions Search Input. I covered multiple use cases.
Please watch this video. I hope this video would be helpful for you to understand it and use it in your projects
Please subscribe: https://www.youtube.com/channel/UCL5nKCmpReJZZMe9_bYR89w
#angular #angular-material #angular-js #autocomplete #angular-material-autocomplete #angular-tutorial
1618254581
Activate a Device - Netflix.com/activate, roku.com/link, amazon.com/mytv
geeksquad.com/chat-with-an-agent
walmart.capitalone.com/activate
#netflix.com/activate #roku.com/link #amazon.com/mytv #primevideo.com/mytv #samsung.com/printersetup
1611609121
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Pay Medical Bills your bills @https://sites.google.com/view/www-quickpayportal-com/
It is really very easy to pay your bills at [priviabillpay.com](https://sites.google.com/view/www-quickpayportal-com/ "priviabillpay.com"). First of all, patients will have to go to the official Privia Medical Community Online portal . Patients can use the quick pay code of priviabillpay.com to make a one-time payment. On the first page of your statement, the QuickPay code is found. Using Priviabillpay to follow a few steps to get paid.
First of all, you must visit the official portal at [www.priviabillpay.com](https://sites.google.com/view/www-quickpayportal-com/ "www.priviabillpay.com")
In the box, fill out the QuickPay Code and tap Make a Payment.
You will be redirected to a page showing all your current rates.
Now select the fees you want to pay and click the check box that you want to accept quickly.
Finally, click on the payment option button.
Your payment details will be asked on the screen.
Fill out the field required and submit your payment.
Our Official Website : https://sites.google.com/view/www-quickpayportal-com/#www.priviabillpay.com #www-quickpayportal-com #quickpayportal.com #www.quickpayportal.com. #quickpayportal.com.