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“Duplicates in a repeater are not allowed” on ng-repeat

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野的像风
野的像风 2021-02-05 06:48

I\'ve got the following json data returned from a service request:

{
    \"entries\": [{
        \"id\": 2081,
        \"name\": \"BM\",
        \"niceName\": \"
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6条回答
  • 刺人心
    2021-02-05 07:09

    Add track by $index to your ng repeat so instead of:

    <option ng-repeat="entry in entries" value="{{entry.name}}">{{entry.name}}</option>

    Try:

    <option ng-repeat="entry in entries track by $index" value="{{entry.name}}">{{entry.name}}</option>

    There's further information about this in the documentation for this error message:

    Occurs if there are duplicate keys in an ngRepeat expression. Duplicate keys are banned because AngularJS uses keys to associate DOM nodes with items.

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

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  • 醉话见心
    2021-02-05 07:12

    It looks like you have a problem with the structure of the data in your scope. Your example JSON shows an object with an entries property and a count property. You then put that whole object in your scope as entries. This means you'd need to access the entries as entries.entries, with the count in entries.count. Perhaps this controller is closer to what you wanted:

    myApp.controller("MyController", ['$scope', '$http', '$log', function($scope, $http, $log){
    ...

    $http.get('https://myServiceURL').success(function(data){
        $scope.entries = data.entries;
        $scope.count = data.count;
    });
}]);
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  • 半阙折子戏
    2021-02-05 07:15

    // To allow this Web Service to be called from script, using ASP.NET AJAX,uncomment the following line.

    [System.Web.Script.Services.ScriptService] ==> Uncomment this line If you use .NET Service

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  • 北恋
    2021-02-05 07:15

    duplicates in In ng-repeat is not allowed . Example 

        <!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title></title>
    <script src="angular.js"></script>

</head>
<body>
    <div ng-app="myApp" ng-controller="personController">
        <table>
            <tr> <th>First Name</th> <th>Last Name</th> </tr>
            <tr ng-repeat="person in people track by $index">
                <td>{{person.firstName}}</td>
                <td>{{person.lastName}}</td>
                <td><input type="button" value="Select" ng-click="showDetails($index)" /></td>
            </tr>

        </table> <hr />
        <table>
            <tr ng-repeat="person1 in items track by $index">
                <td>{{person1.firstName}}</td>
                <td>{{person1.lastName}}</td>
            </tr>
        </table>
        <span>   {{sayHello()}}</span>
    </div>
    <script> var myApp = angular.module("myApp", []);
        myApp.controller("personController", ['$scope', function ($scope)
        { 
            $scope.people = [{ firstName: "F1", lastName: "L1" },
                { firstName: "F2", lastName: "L2" }, 
                { firstName: "F3", lastName: "L3" }, 
                { firstName: "F4", lastName: "L4" }, 
                { firstName: "F5", lastName: "L5" }]
            $scope.items = [];
            $scope.selectedPerson = $scope.people[0];
            $scope.showDetails = function (ind) 
            { 
                $scope.selectedPerson = $scope.people[ind];
                $scope.items.push($scope.selectedPerson);
            }
            $scope.sayHello = function ()
            {
                return $scope.items.firstName;
            }
        }]) </script>
</body>
</html>
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  • 轻奢々
    2021-02-05 07:22

    If I may add an additional reason as to why this can occur...

    If you are doing this with a JS object [] or {}

    and you are passing it in to a directive like this

    <my-directive my-attribute="{{ myObject }}"></my-directive>

    Inside the directive you must turn myObject back into an object by doing this

    ...
controller: function( $scope ){

  $scope.links = $scope.$eval( $scope.myObject );
....

    Then the HTML and ng-repeat will work

    ...
<span class="" ng-repeat="link in links">
...

    ngRepeat does not know how to repeat over a single string.

    Here is what the object would look like before $scope.$eval

    "[{ hello: 'you' }]"

    and after $scope.$eval()

    [{ hello: 'you' }] an actual object to repeat over.

    The error kind of makes a reference that it cannot repeat of a string. Here is the error that I got.

    Error: [ngRepeat:dupes] http://errors.angularjs.org/1.3.0-beta.8/ngRepeat/dupes?p0=link%20in%20links&p1=string%3Al

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  • 北海茫月
    2021-02-05 07:32

    Your JSON is invalid and should be :

    {
    "entries": [{
        "id": 2081,
        "name": "BM",
        "niceName": "bodmas"
    }, {
        "id": 8029,
        "name": "Mas",
        "niceName": "Masm"
    }],
    "count": 2
}

    Also, make sure you are accessing the document at the right level, use :

    $http.get('https://myServiceURL').success(function(data){
    $scope.entries = data.entries;
});

    Then, it should work. See this JSBin.

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