How to handle data binding on a dynamic set of checkboxes

Question

I'm trying to create an angular directive making me able to select from a list of items group by category. Each item should be selectable using a checkbox.

The input data to the directive is something like

[
  {
    "id": "1",
    "name": "category1",
    "items": [
      {
        "id": "1",
        "name": "item1"
      },
      {
        "id": "2",
        "name": "item2"
      },
      {
        "id": "3",
        "name": "item3"
      },
      {
        "id": "4",
        "name": "item4"
      }
    ]
  },
  {
    "id": "2",
    "name": "category2",
    "items": [
      {
        "id": "5",
        "name": "item5"
      },
      {
        "id": "6",
        "name": "item6"
      }
    ]
  }
]

And the object of pre-checked items is:

{
  "1": [
    "2",
    "4"
  ]
}

Here item with id 2 and 4 from category with 1 should be pre-checked.

My code results in this view:

The checked-state is handled using the ng-checked directive:

<input id="item-{{item.id}}" value="{{item.id}}" type="checkbox" ng-checked="isSelected(cat,item)">

When checking/unchecking an item, the selected items object should be updated to reflect the current state. How can I handle this? Should all this be structured in a different way?

See my plumber: http://plnkr.co/edit/6fbfZnQCq5fq1zDp8VIB.

muenchdo · Accepted Answer · 2015-09-01 13:48:48Z

As always, there is multiple ways to achieve this. My suggestion:

Use ng-model on your inputs:

<input ng-model="selected[cat.id][item.id]" 
       id="item-{{item.id}}" 
       value="{{item.id}}" 
       type="checkbox" 
       ng-checked="selected[cat.id][item.id]">

This will require a slight modification of your selectedItems property (it is now an object instead of an array):

$scope.selectedItems = {
    "1": {
        "2": true,
        "4": true
    }
};

The ng-checked in the HTML will automatically check the items which are marked true.

I'm not sure how you want to handle the selection of categories, but I hope this will give you an idea!

Check the updated Plunker.

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