Angular Reactive Form - Select options: disable previously selected options

Angular Reactive Form - Select options: disable previously selected options

To disable previously selected options in a dropdown list within an Angular Reactive Form, you can dynamically generate the options with the [disabled] attribute based on the current selection. Here's an example:

Assuming you have a form group in your component:

import { Component, OnInit } from '@angular/core'; import { FormBuilder, FormGroup, Validators } from '@angular/forms'; @Component({ selector: 'app-your-component', templateUrl: './your-component.component.html', styleUrls: ['./your-component.component.css'] }) export class YourComponent implements OnInit { form: FormGroup; constructor(private fb: FormBuilder) {} ngOnInit() { this.form = this.fb.group({ selectedOption: [null, Validators.required] }); } }

In your component template (your-component.component.html), you can dynamically disable options based on the current selection:

<form [formGroup]="form"> <label for="selectedOption">Select an option:</label> <select formControlName="selectedOption" id="selectedOption"> <option value="" disabled>Select an option</option> <option *ngFor="let option of yourOptions" [value]="option.value" [disabled]="isOptionDisabled(option.value)"> {{ option.label }} </option> </select> </form>

In your component class (your-component.component.ts), you can define the isOptionDisabled method to determine whether an option should be disabled based on the current selection:

isOptionDisabled(value: any): boolean { const selectedValue = this.form.get('selectedOption').value; return selectedValue !== null && value !== selectedValue; }

This way, when a user selects an option, it will be disabled in the dropdown, preventing it from being selected again until a different option is chosen. Adjust the logic as needed based on your specific requirements.

Examples

  1. Angular Reactive Form select disable previously selected option

    • Code Implementation:
      // Use *ngFor and [disabled] attribute in the template <select formControlName="mySelect"> <option *ngFor="let option of options" [value]="option.value" [disabled]="isOptionDisabled(option.value)"> {{ option.label }} </option> </select> 
      // Implement isOptionDisabled function in the component isOptionDisabled(selectedValue: string): boolean { return this.form.get('mySelect').value === selectedValue; }
    • Description: Disable previously selected options in a dropdown by using *ngFor to iterate through the options and the [disabled] attribute to conditionally disable options based on the selected value.

  2. Angular Reactive Forms disable selected option in dropdown

    • Code Implementation:
      // Use *ngFor and [attr.disabled] attribute in the template <select formControlName="mySelect"> <option *ngFor="let option of options" [value]="option.value" [attr.disabled]="isOptionDisabled(option.value)"> {{ option.label }} </option> </select> 
      // Implement isOptionDisabled function in the component isOptionDisabled(selectedValue: string): string { return this.form.get('mySelect').value === selectedValue ? 'disabled' : null; }
    • Description: Disable selected options in a dropdown using [attr.disabled] to set the disabled attribute based on the selected value.

  3. Angular Reactive Form disable previously selected option in dropdown

    • Code Implementation:
      // Use *ngFor and [disabled] attribute in the template <select formControlName="mySelect"> <option *ngFor="let option of options" [value]="option.value" [disabled]="form.get('mySelect').value === option.value"> {{ option.label }} </option> </select>
    • Description: Disable previously selected options in a dropdown directly in the template using *ngFor and [disabled] attribute.

  4. Angular disable selected option in reactive form dropdown

    • Code Implementation:
      // Use *ngFor and [attr.disabled] attribute in the template <select formControlName="mySelect"> <option *ngFor="let option of options" [value]="option.value" [attr.disabled]="isOptionDisabled(option.value)"> {{ option.label }} </option> </select> 
      // Implement isOptionDisabled function in the component isOptionDisabled(selectedValue: string): string { return this.form.get('mySelect').value === selectedValue ? 'disabled' : null; }
    • Description: Disable selected options in a dropdown within a reactive form using [attr.disabled] based on the selected value.

  5. Angular Reactive Forms disable previously selected option

    • Code Implementation:
      // Use *ngFor and [disabled] attribute in the template <select formControlName="mySelect"> <option *ngFor="let option of options" [value]="option.value" [disabled]="form.get('mySelect').value === option.value"> {{ option.label }} </option> </select>
    • Description: Disable previously selected options in a dropdown of a reactive form using *ngFor and [disabled] attribute in the template.

  6. Angular disable selected option in reactive form dropdown

    • Code Implementation:
      // Use *ngFor and [attr.disabled] attribute in the template <select formControlName="mySelect"> <option *ngFor="let option of options" [value]="option.value" [attr.disabled]="isOptionDisabled(option.value)"> {{ option.label }} </option> </select> 
      // Implement isOptionDisabled function in the component isOptionDisabled(selectedValue: string): string { return this.form.get('mySelect').value === selectedValue ? 'disabled' : null; }
    • Description: Disable selected options in a dropdown within a reactive form using [attr.disabled] based on the selected value.

  7. Angular Reactive Form disable previously selected option in dropdown

    • Code Implementation:
      // Use *ngFor and [disabled] attribute in the template <select formControlName="mySelect"> <option *ngFor="let option of options" [value]="option.value" [disabled]="form.get('mySelect').value === option.value"> {{ option.label }} </option> </select>
    • Description: Disable previously selected options in a dropdown directly in the template using *ngFor and [disabled] attribute.

  8. Angular Reactive Forms disable selected option in dropdown

    • Code Implementation:
      // Use *ngFor and [attr.disabled] attribute in the template <select formControlName="mySelect"> <option *ngFor="let option of options" [value]="option.value" [attr.disabled]="isOptionDisabled(option.value)"> {{ option.label }} </option> </select> 
      // Implement isOptionDisabled function in the component isOptionDisabled(selectedValue: string): string { return this.form.get('mySelect').value === selectedValue ? 'disabled' : null; }
    • Description: Disable selected options in a dropdown within a reactive form using [attr.disabled] based on the selected value.

  9. Angular Reactive Form select disable previously selected option

    • Code Implementation:
      // Use *ngFor and [disabled] attribute in the template <select formControlName="mySelect"> <option *ngFor="let option of options" [value]="option.value" [disabled]="isOptionDisabled(option.value)"> {{ option.label }} </option> </select> 
      // Implement isOptionDisabled function in the component isOptionDisabled(selectedValue: string): boolean { return this.form.get('mySelect').value === selectedValue; }
    • Description: Disable previously selected options in a dropdown by using *ngFor to iterate through the options and the [disabled] attribute to conditionally disable options based on the selected value.

  10. Angular Reactive Forms disable selected option in dropdown

    • Code Implementation:
      // Use *ngFor and [attr.disabled] attribute in the template <select formControlName="mySelect"> <option *ngFor="let option of options" [value]="option.value" [attr.disabled]="isOptionDisabled(option.value)"> {{ option.label }} </option> </select> 
      // Implement isOptionDisabled function in the component isOptionDisabled(selectedValue: string): string { return this.form.get('mySelect').value === selectedValue ? 'disabled' : null; }
    • Description: Disable selected options in a dropdown within a reactive form using [attr.disabled] based on the selected value.

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