AngularJS - "Refrain from replicating items in a repeater"

I am facing an issue with creating HTML textarea elements for each member of an array. Despite consulting the AngularJS documentation and attempting different track by expressions, I am unable to render them.

The problem arises when a user inputs the same text in multiple textareas. It appears that Angular is treating the textarea value as a unique key. One potential solution could be to append or remove an arbitrary identifier before the text, although this seems like a workaround.

To clarify, the textareas are displayed properly until the user submits the form (using JavaScript only - no server round-trip), after which subsequent code processes and displays the input.

Thank you in advance.

The specific error message received is:

Duplicates in a repeater are not allowed. 
Use 'track by' expression to specify unique keys. 
Repeater: openEndedQuestion in openEndedQuestions track by openEndedQuestion.id, 
Duplicate key: undefined

The provided HTML code is:

<tr ng-repeat="openEndedQuestion in openEndedQuestions">
    <td width="375" style="font-size: 18px;">
        <b>{{openEndedQuestion}}</b><br>
        <textarea id="openEndedAnswer_{{$index}}" cols="80"></textarea>
    </td>
</tr>

The next stage of HTML code is:

<tr ng-repeat="openEndedAnswer in openEndedAnswers">
    <td width="375" style="font-size: 18px;">
        <b>{{openEndedAnswer}}</b>
    </td>

    <td width="225">
        <span style="font-size: 35px; padding: 2px; color: #468847;" 
              ng-repeat="starIndex in [0, 1, 2, 3, 4]"
              ng-click="povStarTracker.setStarRating($parent.$index, starIndex + 1)" 
              ng-class="povStarTracker.getClassForStar($parent.$index, starIndex)"></span>
    </td>
</tr>

The JSON data behind this issue is:

"openEndedQuestions" : [ 
    "Do you think the coach is being fair?", 
    "Should the coach give all of his players a chance to play in the games?", 
    "Should Austin say anything about this to his coach?", 
    "What could Ryan say to Austin?"
]
javascriptangularjsangularjs-ng-repeat

Answer №1

Include the track by section in your ng-repeat code

You can either use by $index or by openEndedQuestion

 <tr ng-repeat="oeq in openEndedQuestions track by oeq">

or

 <tr ng-repeat="oeq in openEndedQuestions track by $index">

The second option is preferred

It's also recommended to avoid binding to primitives like strings and numbers in Angular. Consider this alternative approach:

In the controller:

$scope.questions = [

 {id:1, text: "Are you enjoying the new content?"}, 
 {id:2, text: "What do you think of the latest updates?"}, 
 {id:3, text: "Should suggestions from users be implemented?"}, 
 {id:4, text: "How can we improve user experience?"}
]

And in the template:

 <tr ng-repeat="q in questions track by q.id">

Check out the example on jsfiddle: http://jsfiddle.net/yourusername/example123/

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