disable checkbox using angularjs

Question

1. With default checked box is value being 1.
2. If user can click on button like ALL or DEFAULT or NONE to select the checkboxes.
3. If user clicks NONE, the DEFAULT checkbox should be checked and disabled; As default is always be 1.
4. If user clicks on the button ALL or DEFAULT or any custom checks the disabled attribute should be removed and should perform normally.

Note:Need to disable the checkbox when clicks on NONE (from the controller/view);

 if(arrObj.id === 1){
    arrObj.enabled = true;
    arrObj.text = "1 [Default Value]";
    //TO DISABLE THE CHECKBOX so that it can't be unchecked
  }else{
    arrObj.enabled = false;
  }

DEMO LINK

Answer 1

add a scope variable enableBoxes and the use the ng-disable directive to disable all the checkboxes you want in this case you can use

 <input type="checkbox" ng-model="n.enabled" ng-disabled="!enableBoxes && $index==0">{{n.text}} <br/>

see example here

http://plnkr.co/edit/IMKkeyYUKzfXulhHGxpJ?p=preview

note the $index==0 for targetting only the first checkbox a more general rule can be applied if needed for targeting others