Tips for adding a "Select All" feature to a dropdown list?

Question

Tips for adding a "Select All" feature to a dropdown list?

Currently, I have a dropdown list with a filter for IN and OUT values. The functionality is working as expected:

<select class="form-select" style="max-width: 100px" [ngModel]="selectedBrand" (ngModelChange)="onChangeType($event)">
    <option [value]="'IN'">IN</option>
    <option [value]="'OUT'">OUT</option>
</select>

In my TypeScript file:

  public selectedBrand: any;
  public onChangeType(type: any) {
    this.selectedBrand = type;
    console.log(this.selectedBrand);

    this.filteredCustomer = this.customerTransferts.filter(
        (item) => item.type === this.selectedBrand
    );
    console.log(this.filteredCustomer);
  }

Now, I want to enhance the functionality by adding a SELECT ALL option to display all elements of either IN or OUT.

I'm seeking guidance on what modifications are needed in my code to achieve this.

Thank you in advance for your assistance.

javascript angular typescript

Answer 1

Answer №1

If you want to remove the filter, you can create a function like this:

resetFilter() {
    this.selectedBrand = '';
    this.filteredCustomer = this.customerTransferts
}

You can trigger this function with a button click or any other method you prefer.

Alternatively, you can add another option in your dropdown menu and handle it in the onChangeType method.

<select class="form-select" style="max-width: 100px" [ngModel]="selectedBrand" (ngModelChange)="onChangeType($event)">
    <option [value]="'ALL'">ALL</option>
    <option [value]="'IN'">IN</option>
    <option [value]="'OUT'">OUT</option>
</select>

public onChangeType(type: any) {
    if (type === 'ALL') {
      this.filteredCustomer = this.customerTransferts;
      return;
    }

    this.selectedBrand = type;
    console.log(this.selectedBrand);

    this.filteredCustomer = this.customerTransferts.filter(
        (item) => item.type === this.selectedBrand
    );
    console.log(this.filteredCustomer);
  }

It's recommended to use two-way binding for selectedBrand by changing ngModel to [(ngModel)].

<select class="form-select" style="max-width: 100px" [(ngModel)]="selectedBrand" (ngModelChange)="onChangeType($event)">

This way, the selectedBrand property will stay in sync automatically - both ways.

As a result, you can eliminate this.selectedBrand = type from the onChangeType() function.

public onChangeType(type: any) {
    if (type === 'ALL') {
      this.filteredCustomer = this.customerTransferts;
      return;
    }

    this.filteredCustomer = this.customerTransferts.filter(
        (item) => item.type === type
    );
  }

Answer 2

If you want to remove the filter, you can create a function like this:

resetFilter() {
    this.selectedBrand = '';
    this.filteredCustomer = this.customerTransferts
}

You can trigger this function with a button click or any other method you prefer.

Alternatively, you can add another option in your dropdown menu and handle it in the onChangeType method.

<select class="form-select" style="max-width: 100px" [ngModel]="selectedBrand" (ngModelChange)="onChangeType($event)">
    <option [value]="'ALL'">ALL</option>
    <option [value]="'IN'">IN</option>
    <option [value]="'OUT'">OUT</option>
</select>

public onChangeType(type: any) {
    if (type === 'ALL') {
      this.filteredCustomer = this.customerTransferts;
      return;
    }

    this.selectedBrand = type;
    console.log(this.selectedBrand);

    this.filteredCustomer = this.customerTransferts.filter(
        (item) => item.type === this.selectedBrand
    );
    console.log(this.filteredCustomer);
  }

It's recommended to use two-way binding for selectedBrand by changing ngModel to [(ngModel)].

<select class="form-select" style="max-width: 100px" [(ngModel)]="selectedBrand" (ngModelChange)="onChangeType($event)">

This way, the selectedBrand property will stay in sync automatically - both ways.

As a result, you can eliminate this.selectedBrand = type from the onChangeType() function.

public onChangeType(type: any) {
    if (type === 'ALL') {
      this.filteredCustomer = this.customerTransferts;
      return;
    }

    this.filteredCustomer = this.customerTransferts.filter(
        (item) => item.type === type
    );
  }

Tips for adding a "Select All" feature to a dropdown list?

Answer №1

Similar questions

What is the process for creating a hover linear wipe transition using CSS/JS?

PAYEE_ACCOUNT_RESTRICTED: Restrictions have been placed on the merchant account

The dropdown feature in Bootstrap 5 seems to be malfunctioning in Angular 12

Building secure and responsive routes using next.js middleware

Error message: ngRepeat does not allow duplicate elements in an array

Using React and TypeScript, open the initial tab from a mapped array with an accordion component

Retrieve the non-empty attributes of a JSON object

Button Fails to Respond on Second Click

A function that handles HTTP request and response

Can anyone recommend a reliable continuous integration pipeline for StrongLoop and GitHub integration?

Create a hierarchical tree structure using a string separated by dots

HighCharts velocity gauge inquiry

Issue with Angular 7 ngZone causing undefined error

javascript - Include new parameter in object literal and retrieve

What could be causing BeautifulSoup to overlook certain elements on the page?

Having trouble obtaining search parameters in page.tsx with Next.js 13

Would it be unwise to send an AJAX post request every two seconds?

Error: Attempting to access 'props' property of undefined when clicking on a button within a React application leads to a TypeError

Switching between filters using AngularJS toggle buttons

Alternative solution to avoid conflicts with variable names in JavaScript, besides using an iframe