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Error : [ngRepeat:dupes] duplicates in a repeater are not allowed.

Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys. Repeater: {0}, Duplicate key: {1}, Duplicate value: {2}

By default, collections are keyed by reference which is desirable for most common models but can be problematic for primitive types that are interned.

My Problem is - Error: [ngRepeat:dupes] duplicates in a repeater are not allowed.
// this code throws the error "Duplicates in a repeater are not allowed.
// ngRepeater: row in ['Declined By P', 'Quoted By P', 'Quoted By P', 'Declined By P', 'Declined By P']"
<ul>
  <li ng-repeat="row in ['Declined By P', 'Quoted By P', 'Quoted By P', 'Declined By P', 'Declined By P']">
      {{row}}
  </li>
</ul>

AngularJs does not allow duplicates in ng-repeat directive. So I got an error - ngRepeat:dupes

The Solution is - Use 'track by' expression to specify unique keys. See in the below example.

<ul>
    <li ng-repeat="row in ['Declined By P', 'Quoted By P', 'Quoted By P', 'Declined By P', 'Declined By P'] track by $index">
      {{row}}
    </li>
</ul>
 

OR

<div ng-repeat="user in user.userList track by user.UserId">
    {{user.name}}
</div>

Here UserId is unique id and the name of user can be same. So use “track by user.UserId” for ignores error.

See in the AngularJs Official - here: https://docs.angularjs.org/error/ngRepeat/dupes
By Anil Singh | Rating of this article (*****)

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