Populate input fields in HTML using Angular 4

Question

Populate input fields in HTML using Angular 4

Within my angular 4 project, I am facing the challenge of setting a value in an input field and in a MatSelect without relying on any binding.

Here is the HTML structure:

<div class="row search-component">
    <div class="col-md-5 no-padding-right">
        <mat-form-field>
            <mat-select placeholder="searchfor" id="selectedFilter" name="propertyList" #selectedFilter>
                <mat-option *ngFor="let property of propertyList" [value]="property">
                    {{property.label}} </mat-option>
            </mat-select>
        </mat-form-field>
    </div>

    <div class="col-md-7 no-padding-left">
        <mat-form-field>
            <input matInput placeholder="search" id="searchfield" name="searchfield" #selectedValue>
            <mat-icon class="pointer" matSuffix>search</mat-icon>
        </mat-form-field>
    </div>
</div>

Upon clicking a button, I need to populate a Mat-option and set a value in the input field dynamically.

Below is the method responsible for setting these values:

 setField(chipSelected: Filter) {
    this.filter = chipSelected;
    document.getElementById('searchfield').focus();
    document.getElementById('searchfield').value = 'somevalue'; <-- The challenge lies here
  }

I'm encountering difficulty in accessing the value. Why is this happening? And what can be done to resolve it?

angular typescript

Answer 1

Answer №1

If you want to access an input element in Angular, you can do so by using the following method:

<input #someInput placeholder="test input">

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

export class AppComponent implements AfterViewInit {
  @ViewChild('someInput') someInput: ElementRef;

  ngAfterViewInit() {
    this.someInput.nativeElement.value = "update input value";
  }
}

When working with Angular, you can easily bind an input to a template property and assign a value like this:

<input matInput [(ngModel)] = "searchFor" placeholder="search" 
      id="searchfield" name="searchfield" #selectedValue>

In your TypeScript file, you can then set the field's value by calling a function like this:

setField(chipSelected: Filter) {
///your code
 this.searchFor='somevalue';
}

I'm also confused why you are trying to get an element value using document.getElementById when you are already working with Angular and TypeScript. You should be able to achieve this functionality easily within the Component and template files.

Answer 2

If you want to access an input element in Angular, you can do so by using the following method:

<input #someInput placeholder="test input">

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

export class AppComponent implements AfterViewInit {
  @ViewChild('someInput') someInput: ElementRef;

  ngAfterViewInit() {
    this.someInput.nativeElement.value = "update input value";
  }
}

When working with Angular, you can easily bind an input to a template property and assign a value like this:

<input matInput [(ngModel)] = "searchFor" placeholder="search" 
      id="searchfield" name="searchfield" #selectedValue>

In your TypeScript file, you can then set the field's value by calling a function like this:

setField(chipSelected: Filter) {
///your code
 this.searchFor='somevalue';
}

I'm also confused why you are trying to get an element value using document.getElementById when you are already working with Angular and TypeScript. You should be able to achieve this functionality easily within the Component and template files.

Answer 3

Answer №2

Looks like you're just starting out in the Angular world. I recommend diving into some material on ngModel and data binding in Angular (check out this link). Using JavaScript methods like .getElementId() may not be the best approach. It's better to utilize ngModel for your input field, like this:

<input matInput placeholder="search" [(ngModel)]="someValue" id="searchfield" name="searchfield">

In your component, declare a variable:

someValue: string;

Then, in your method, use:

setField(chipSelected: Filter) {
    this.someValue = 'somevalue';
}

Answer 4

Looks like you're just starting out in the Angular world. I recommend diving into some material on ngModel and data binding in Angular (check out this link). Using JavaScript methods like .getElementId() may not be the best approach. It's better to utilize ngModel for your input field, like this:

<input matInput placeholder="search" [(ngModel)]="someValue" id="searchfield" name="searchfield">

In your component, declare a variable:

someValue: string;

Then, in your method, use:

setField(chipSelected: Filter) {
    this.someValue = 'somevalue';
}

Populate input fields in HTML using Angular 4

Answer №1

Answer №2

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