Is there a method to automatically select or deselect a checkbox based on the incoming value in Angular?

When new data comes in, the table gets populated and I can't specify that "A" should be checked while "D" shouldn't.

 re(ref: getrefactormodel, count:number){
      let data= this.fb.group({
           word_to_rename: [ref.word_to_rename, Validators.required],
           renowned_word: [ref.renowned_word, Validators.required],
           name:[ref.name, Validators.required],
           id:[ref.id, Validators.required],
           activecheck:[ref.activecheck, Validators.required]
         });
       this.refactorFormGroupItemsArray.insert(counter,data);
   }

Is there a way to set up an input so that if the value is A it checks, but if it's D it doesn't?

<input  type="checkbox"  formControlName="activecheck" value="D" />

Answer №1

When setting a checkbox as a string, it still holds a true/false value and will toggle between false and true when changed.


re(ref: getrefactormodel, contador:number){
      let datos= this.fb.group({
           word_to_rename: [ref.word_to_rename, Validators.required],
           renowned_word: [ref.renowned_word, Validators.required],
           name:[ref.name, Validators.required],
           id:[ref.id, Validators.required],
           activecheck:[ref.activecheck == 'D' ? true : false , Validators.required]
         });
       this.refactorFormGroupItemsArray.insert(contador,datos);
   }

Check out the demo 🚀

Some Angular component libraries offer checkbox components that behave according to your needs. I recommend using PrimeNG's checkbox component available here.

Answer №2

To achieve this, you can make use of the [checked] operator that takes a Boolean value. Here's an example:

<input type="checkbox" [checked]="isActive == 'true'">

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