CODEWITHSUNDEEP
htmlcheckboxangularboolean
jiji
jiji

Reputation: 347

Checkbox checked if boolean is true with Angular2

I would like to know how to make a checkbox checked if the value is true, and unchecked if false with Angular2.

Adult <input type="checkbox" value="{{person.is_adult}}">

{{person.is_adult}} is a boolean

Can someone please suggest anything? Thanks

Upvotes: 20

Views: 66196

Answers (3)

Abolfazl Roshanzamir
Abolfazl Roshanzamir

Reputation: 14792

Try the following :

<input type="checkbox" [checked]="person.is_adult">

If you are using ngModel :

When ngModel is used in a form it won't work. However, you should use [ngModelOptions] attribute like

<input
  type="checkbox"
  name="is_adult"
  [(ngModel)]="person.is_adult"
  [ngModelOptions]="{standalone: true}"/>

Upvotes: 0

G&#252;nter Z&#246;chbauer
G&#252;nter Z&#246;chbauer

Reputation: 657108

{{}} does string interpolation and stringifies true and false and Angular by default uses property binding and I assume the property expects boolean values not strings:

<input type="checkbox" [checked]="person.is_adult">

This might work as well

<input type="checkbox" attr.checked="{{person.is_adult}}">

because with attribute binding the browser might translate it from the attribute (which can only be strings) to boolean when reading it into its property.

It is also checked instead of value

You can also use ngModel

<input type="checkbox" [ngModel]"person.is_adult" name="isAdult">
<input type="checkbox" [(ngModel)]"person.is_adult" name="isAdult">

for one-way or two-way binding.
Ensure your have the FormsModule imported if you use ngModel.

Upvotes: 30

Madhu Ranjan
Madhu Ranjan

Reputation: 17894

you are missing square bracket around checked

<input type="checkbox" [checked]="person.is_adult">

Hope this helps!!

Upvotes: 15

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