Reactive forms in Angular now support changing focus when the Enter key is pressed

Question

Reactive forms in Angular now support changing focus when the Enter key is pressed

I have successfully created a table and a button that generates dynamic rows with inputs inside the table. One issue I'm facing is that when I press enter in the first input, a new row is created (which works), but I can't seem to focus on the new input field. Below is my current implementation:

<input type="text" class="form-control" placeholder="Product Code" formControlName="product_code" tabindex="{{i+1}}" (keyup.enter)="autoProduct($event)">

Here is the relevant code from my .ts file:

autoProduct(event) {
    this.addProduct();
    if (event.keyCode === 13) {
      event.preventDefault();
      const inputs =
        Array.prototype.slice.call(document.querySelectorAll('input'));
      console.log(inputs);
      const index =
        (inputs.indexOf(document.activeElement) + 1) % inputs.length;
      console.log(index);
      const input = inputs[index];
      console.log(input);
      input.focus();
      input.select();
    }
  }

I've looked at solutions on Stack Overflow, but I haven't been able to get it to work. Any assistance would be greatly appreciated.

javascript angular typescript

Answer 1

Answer №1

You can implement the ViewChildren functionality.

private inputToFocus: any;
@ViewChildren('inputToFocus') set inputF(inputF: any) {
  this.inputToFocus = inputF
  this.inputToFocus.first.nativeElement.focus();
}

To use this, add #inputToFocus in your input tag. For example: <input ... #inputToFocus>

Edit

If you want to add a new input field dynamically, here is the code snippet:

.ts:

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

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  name = 'Angular 6';
  counts = [1];
  private inputToFocus: any;
  @ViewChildren('inputToFocus') set inputF(inputF: any) {
    this.inputToFocus = inputF
    this.inputToFocus.last.nativeElement.focus();
  }

  autoProduct(event) {
    if (event.keyCode === 13) {
      event.preventDefault();
      const inputs =
        Array.prototype.slice.call(document.querySelectorAll('input'));
      const index =
        (inputs.indexOf(document.activeElement) + 1) % inputs.length;
      this.addProduct(index);
      const input = inputs[index];
      input.focus();
      input.select();
    }
  }
  addProduct(i) {
     this.counts.push(i)
  }
}

.html:

<div *ngFor="let count of counts; let i=index">
  <input type="text" class="form-control" placeholder="Product Code" tabindex="{{i+1}}" (keyup.enter)="autoProduct($event)" #inputToFocus>
</div>

Please note that I have updated the usage of .last.

Answer 2

You can implement the ViewChildren functionality.

private inputToFocus: any;
@ViewChildren('inputToFocus') set inputF(inputF: any) {
  this.inputToFocus = inputF
  this.inputToFocus.first.nativeElement.focus();
}

To use this, add #inputToFocus in your input tag. For example: <input ... #inputToFocus>

Edit

If you want to add a new input field dynamically, here is the code snippet:

.ts:

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

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  name = 'Angular 6';
  counts = [1];
  private inputToFocus: any;
  @ViewChildren('inputToFocus') set inputF(inputF: any) {
    this.inputToFocus = inputF
    this.inputToFocus.last.nativeElement.focus();
  }

  autoProduct(event) {
    if (event.keyCode === 13) {
      event.preventDefault();
      const inputs =
        Array.prototype.slice.call(document.querySelectorAll('input'));
      const index =
        (inputs.indexOf(document.activeElement) + 1) % inputs.length;
      this.addProduct(index);
      const input = inputs[index];
      input.focus();
      input.select();
    }
  }
  addProduct(i) {
     this.counts.push(i)
  }
}

.html:

<div *ngFor="let count of counts; let i=index">
  <input type="text" class="form-control" placeholder="Product Code" tabindex="{{i+1}}" (keyup.enter)="autoProduct($event)" #inputToFocus>
</div>

Please note that I have updated the usage of .last.

Answer 3

Answer №2

Here is a code snippet that allows you to have control over focus in a form. This code focuses on the next field every time you press enter or the arrow down key, and it can be customized according to your needs. It also works seamlessly with Bootstrap.

The code records input fields in a table, giving you the flexibility to enable focus on any specific field. If you dynamically add an input field, the table will automatically update.

In my experience, I haven't found a better solution using Angular.

To implement this functionality, you can use the following HTML code in your editor component:

<div>
    <form>
      <div class="container-fluid" *ngFor="let item of data; let i = index">
        <div class="form-group">
          <div class="row">
            <div class="col-md-3">{{item.designation}}</div>
            <div class="col-md-2">{{item.type}}</div>
            
            <div *ngIf="item.type == 'float'" class="col-md-2">{{item.value | number: '1.1-3'}}</div>
            <div *ngIf="item.type == 'int'" class="col-md-2">{{item.value | number}}</div>

            <div class="col-md-2">
              <input #input type="number" class="form-control" (keydown)="onKeydown($event, i)">
            </div>

            <div class="col-md-3">{{item.commentaire}}</div>
          </div>
        </div>
      </div>
    </form>
  </div>

In the editor component TypeScript file (editor.component.ts), incorporate the following logic:

import { Component, OnInit } from '@angular/core';
import { ViewChildren, QueryList } from '@angular/core';

@Component({
  selector: 'app-editor',
  templateUrl: './editor.component.html',
  styleUrls: ['./editor.component.css']
})
export class EditorComponent implements AfterViewInit {

  @ViewChildren("input") inputs: QueryList<any>

  constructor() {
  }

  private onKeydown(event, val) {
    console.log(event.key);
    
    if (event.key === "Enter" || event.key === "ArrowDown") {
      // Focus on the next input field
      if (val + 1 < this.inputs.toArray().length) {
        this.inputs.toArray()[val + 1].nativeElement.focus();
      } else {
        this.inputs.toArray()[0].nativeElement.focus();
      }
    }
  }

  private processChildren(): void {
    console.log('Processing children. Count:', this.inputs.toArray().length)
  }

  ngAfterViewInit() {
    console.log("AfterViewInit");
    console.log(this.inputs);
    this.inputs.forEach(input => console.log(input));

    this.inputs.changes.subscribe(_ => 
      this.processChildren()
    );
  }

}

Answer 4

Here is a code snippet that allows you to have control over focus in a form. This code focuses on the next field every time you press enter or the arrow down key, and it can be customized according to your needs. It also works seamlessly with Bootstrap.

The code records input fields in a table, giving you the flexibility to enable focus on any specific field. If you dynamically add an input field, the table will automatically update.

In my experience, I haven't found a better solution using Angular.

To implement this functionality, you can use the following HTML code in your editor component:

<div>
    <form>
      <div class="container-fluid" *ngFor="let item of data; let i = index">
        <div class="form-group">
          <div class="row">
            <div class="col-md-3">{{item.designation}}</div>
            <div class="col-md-2">{{item.type}}</div>
            
            <div *ngIf="item.type == 'float'" class="col-md-2">{{item.value | number: '1.1-3'}}</div>
            <div *ngIf="item.type == 'int'" class="col-md-2">{{item.value | number}}</div>

            <div class="col-md-2">
              <input #input type="number" class="form-control" (keydown)="onKeydown($event, i)">
            </div>

            <div class="col-md-3">{{item.commentaire}}</div>
          </div>
        </div>
      </div>
    </form>
  </div>

In the editor component TypeScript file (editor.component.ts), incorporate the following logic:

import { Component, OnInit } from '@angular/core';
import { ViewChildren, QueryList } from '@angular/core';

@Component({
  selector: 'app-editor',
  templateUrl: './editor.component.html',
  styleUrls: ['./editor.component.css']
})
export class EditorComponent implements AfterViewInit {

  @ViewChildren("input") inputs: QueryList<any>

  constructor() {
  }

  private onKeydown(event, val) {
    console.log(event.key);
    
    if (event.key === "Enter" || event.key === "ArrowDown") {
      // Focus on the next input field
      if (val + 1 < this.inputs.toArray().length) {
        this.inputs.toArray()[val + 1].nativeElement.focus();
      } else {
        this.inputs.toArray()[0].nativeElement.focus();
      }
    }
  }

  private processChildren(): void {
    console.log('Processing children. Count:', this.inputs.toArray().length)
  }

  ngAfterViewInit() {
    console.log("AfterViewInit");
    console.log(this.inputs);
    this.inputs.forEach(input => console.log(input));

    this.inputs.changes.subscribe(_ => 
      this.processChildren()
    );
  }

}

Reactive forms in Angular now support changing focus when the Enter key is pressed

Answer №1

Edit

Answer №2

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