How to fetch the changed object from an array in AngularJs?

Question

I have 2 arrays stored in arr1 and arr2

var arr1 = [
  {
    "status": 4,
    "id": 1
  },
  {
    "status": 2,
    "id": 2
  },
  {
    "status": 1,
    "id": 3
  }];

var arr2 = [{
    "status": 4,
    "id": 1
  },
  {
    "status": 2,
    "id": 2
  },
  {
    "status": 4,
    "id": 3
  }];

Am using angular.equals(arr1, arr2) to check 2 arrays are same but when the status changes in arr2, how can i fetch the respective id from arr2.

"when the status changes" ... please provide more details as per minimal reproducible example. Numerous ways to accomplish this depending on use case — charlietfl
– charlietfl, Commented Apr 1, 2017 at 17:04
whenever the data from backend changes that is arr2's status, i want to display the respective id's status has changed. — Raghav
– Raghav, Commented Apr 1, 2017 at 17:11

korteee · Accepted Answer · 2017-04-01 17:15:26Z

1

This will give you the array which contains the ids of the elements with different status value.

 var elementsChanged = arr1.map((val, idx) => {
        if (val.status !== arr2[idx].status)
          return arr2[idx].id
      })

answered Apr 1, 2017 at 17:15

korteee

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Comments

anoop · Accepted Answer · 2017-04-01 17:29:02Z

1

You need to first put arr2 in $scope and then set $watch on your data to detect the exact id change. $scope.$watch('arr2', function(newValue, oldValue){.//iterate and detect your id change..}, true);

Demo for watcher

Demo Updated with @korte map suggestion.

edited Apr 1, 2017 at 17:29

answered Apr 1, 2017 at 17:17

anoop

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