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Angular 9 Select Dropdown Example | Select Box in Angular



In this short tutorial we will cover an dropdown selection change event in angular 9. In this article, we will implement a angular 9 dropdown change event. you'll learn angular 9 select dropdown example. i explained simply step by step angular 9 select box example.

we will create reactive form step by step with select dropdown box using loop.

Here, i will give you two example to get value of selected select box by click on submit button and another get select dropdown box value in on change value. so we will take "websiteList" variable and create dropdown using it. let's see both example one by one.

You need to follow bellow step to add form validation in angular 9.

Example 1: Get Selected DropDown Value on Form Submit

Step 1: Import FormsModule

If you want to create form in angular app then you need to import FormsModule from @angular/forms library. so let's add following code to app.module.ts file.

src/app/app.module.ts

import { BrowserModule } from '@angular/platform-browser';

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

import { AppComponent } from './app.component';

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

@NgModule({

declarations: [

AppComponent

],

imports: [

BrowserModule,

FormsModule,

ReactiveFormsModule

],

providers: [],

bootstrap: [AppComponent]

})

export class AppModule { }

Step 2: Form with ngModel

In this step, we will write code of html form with ngModel. so add following code to app.component.html file.

I used bootstrap class on this form. if you want to add than then follow this link too: Install Boorstrap 4 to Angular 9.

src/app/app.component.html

<div class="container">

<h1>Angular Select Dropdown Example - HDTuto.com</h1>

<form [formGroup]="form" (ngSubmit)="submit()">

<div class="form-group">

<label for="website">Website:</label>

<select formControlName="website" class="form-control">

<option disabled>Select Website</option>

<option>Choose Website</option>

<option *ngFor="let web of websiteList">{{web}}</option>

</select>

<div *ngIf="f.website.touched && f.website.invalid" class="alert alert-danger">

<div *ngIf="f.website.errors.required">Name is required.</div>

</div>

</div>

<button class="btn btn-primary" type="submit" [disabled]="!form.valid">Submit</button>

</form>

</div>

Step 3: updated Ts File

In ts file. we will write submit() and get all input fields values. so let's add following code to app.component.ts file.

src/app/app.component.ts

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

import { FormGroup, FormControl, Validators} from '@angular/forms';

@Component({

selector: 'app-root',

templateUrl: './app.component.html',

styleUrls: ['./app.component.css']

})

export class AppComponent {

websiteList: any = ['HDTuto.com', 'HDTuto.com', 'Nicesnippets.com']

form = new FormGroup({

website: new FormControl('', Validators.required)

});

get f(){

return this.form.controls;

}

submit(){

console.log(this.form.value);

}

}

Now you can run your application using following command:

ng serve

Example 2: Get Selected DropDown Value on Change Event

Step 1: Import FormsModule

If you want to create form in angular app then you need to import FormsModule from @angular/forms library. so let's add following code to app.module.ts file.

src/app/app.module.ts

import { BrowserModule } from '@angular/platform-browser';

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

import { AppComponent } from './app.component';

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

@NgModule({

declarations: [

AppComponent

],

imports: [

BrowserModule,

FormsModule,

ReactiveFormsModule

],

providers: [],

bootstrap: [AppComponent]

})

export class AppModule { }

Step 2: Form with ngModel

In this step, we will write code of html form with ngModel. so add following code to app.component.html file.

I used bootstrap class on this form. if you want to add than then follow this link too: Install Boorstrap 4 to Angular 9.

src/app/app.component.html

<div class="container">

<h1>Angular Select Dropdown Example - HDTuto.com</h1>

<form [formGroup]="form" (ngSubmit)="submit()">

<div class="form-group">

<label for="website">Website:</label>

<select formControlName="website" class="form-control" (change)="changeWebsite($event)">

<option disabled>Select Website</option>

<option>Choose Website</option>

<option *ngFor="let web of websiteList">{{web}}</option>

</select>

<div *ngIf="f.website.touched && f.website.invalid" class="alert alert-danger">

<div *ngIf="f.website.errors.required">Name is required.</div>

</div>

</div>

<button class="btn btn-primary" type="submit" [disabled]="!form.valid">Submit</button>

</form>

</div>

Step 3: updated Ts File

In ts file. we will write submit() and get all input fields values. so let's add following code to app.component.ts file.

src/app/app.component.ts

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

import { FormGroup, FormControl, Validators} from '@angular/forms';

@Component({

selector: 'app-root',

templateUrl: './app.component.html',

styleUrls: ['./app.component.css']

})

export class AppComponent {

websiteList: any = ['HDTuto.com', 'HDTuto.com', 'Nicesnippets.com']

form = new FormGroup({

website: new FormControl('', Validators.required)

});

get f(){

return this.form.controls;

}

submit(){

console.log(this.form.value);

}

changeWebsite(e) {

console.log(e.target.value);

}

}

Now you can run your application using following command:

ng serve

You can see output:

I hope it can help you...




April 3, 2020 | Category : Angular



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