What is the best way to access the ngModel value from an input tag within an AngularJS4 component?

I'm still getting the hang of angularjs4 and I've been working with angular-cli. One thing I need to do is retrieve the value of an ngModel from an input tag in my component. How can I access the value that's been entered into the input field? Once I have this value, I want to create a filter for displaying searched data on my page. What's the best way to go about implementing this in angular4? Below are my app.component.html and app.component.ts files:

import {
    Component
} from '@angular/core';
import {
    Http,
    Response,
    Headers,
    RequestOptions
} from '@angular/http';
import 'rxjs/add/operator/map';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    productsList = '';
    show: boolean;
    hide: boolean;
    listBtn: boolean;
    gridBtn: boolean;
    values = '';

    onKey(event: any) { // without type info
        this.values += event.target.value;
        console.log("value " + this.values);
    }
    listView() {
        this.gridBtn = true;
        this.show = true;
        this.hide = false;
        this.listBtn = false;
    }
    gridView() {
        this.listBtn = true;
        this.gridBtn = false;
        this.show = false;
        this.hide = true;

    }
    constructor(private http: Http) {
        this.show = false;
        this.hide = true;
        this.show = false;
        this.listBtn = true;
        this.gridBtn = false;
        this.getData();
    }
    createAuthorizationHeader(headers: Headers) {
        headers.append('Authorization', 'Basic ' +
            btoa('ck_543700d9f8c08268d75d3efefb302df4fad70a8f:cs_f1514261bbe154d662eb5053880d40518367c901'));
        headers.append("Content-Type", "application/x-www-form-urlencoded");
    }
    getData() {
        console.log('hellooo');
        let headers = new Headers();
        this.createAuthorizationHeader(headers);
        return this.http.get('https://www.colourssoftware.com/wordpress/wp-json/wc/v2/products', {
            headers: headers
        })
            .subscribe(res => {
                const products = res.json();
                console.log(products);
                this.productsList = products;
                console.log(this.productsList);
            })


    }

}

HTML

<div class="container" align="center">
    <div class="row">
        <div class="col-sm-6 col-sm-offset-3">
            <div class="input-group stylish-input-group">
                <input type="text" class="form-control" placeholder="Let's find your product....." (keyup)="onKey($event)">
                <span class="input-group-addon">
                    <button type="submit">
                        <span class="glyphicon glyphicon-search"></span>
                    </button>
                </span>
            </div>
        </div>
    </div>
    <br>
</div>


<br>
<div *ngIf="show">
    <ul class="list-group">
        <li class="list-group-item" *ngFor="let data of productsList">
            <img src="{{data.images[0].src}}" alt="image" width="auto" height="200px">
            <span>{{data.name}}</span>
            <span>{{data.regular_price}}</span>
        </li>
    </ul>
</div>

Answer №1

When it comes to data binding in Angular, there are different ways to achieve the desired outcome:

<input [ngModel]="variable">

For one-way data binding from Component to HTML.

<input [(ngModel)]="variable">

For two-way data binding between Component and HTML.

<input [ngModel]="variable"(ngModelChange)="function_to_fire_on_model_change($event)">

If you wish to work with the changed data from an input field in HTML while using one-way data binding.

Answer №2

UPDATE:

To retrieve the input value without using ngModel (since it's not being used in your snippet), you can do the following:

<input type="text" #input class="form-control" placeholder="Let's find your product....." (keyup)="onKey($event, input.value)">

onKey(event, newValue){
  console.log(newValue);
  console.log(event.key)
}


Typically, the structure would be:

HTML

<input [(ngModel)]="yourModel" ....> 

or

<input [ngModel]="yourModel" (ngModelChange)="doSomething($event)"....> 

Typescript:

yourModel:any;
....
doSomething(event){
   console.log(event) // input value is logged
}

Any changes to the input will automatically update the ngModel since it's two-way bound.

Answer №3

To insert a text input field in the template, you can utilize the line below:

<input type="text" [(ngModel)]="username" name="username" class="form-control" placeholder="Enter your username here" >

In the component.ts file, you will be able to reference this element using this.username.

Answer №4

In order to properly use ngForm, it is essential that all input fields containing [(ngModel)]="" have a designated attribute name with a specified value:

<input [(ngModel)]="firstname" name="something">

Answer №5

<input [(ngModel)]="name"> // utilizing two way data binding

<input [(ngModel)]="name" (ngModelChange)="change()">  // implementing two way data binding with onchange property

<input [ngModel]="name"> // demonstrating one way data binding

In TypeScript:

name: any

To view an example, click on this link

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