ng-repeat angular中的shuffle数组

Question

我正在创建一个测验,每次我开始测验时我想要改变问题,这样他们每次都不会出现在同一个顺序中.

我在我的HTML代码中有这个:

<div ng-repeat="question in questions | filter:ids | orderBy:randomSort">
    <div id="question">{{question.question}}</div><img id="nextImg" ng-src="../app/img/next.png" ng-click="next()" />
    <img class="quizImg" ng-hide="{{question.image}}==null" ng-src="{{question.image}}" />

    <div class="answer" ng-repeat="answer in question.answers">
        <input type="radio" ng-click="checked(answer)">{{answer.answer}}
    </div>
    <!--input id="nextQuestion" type="button" ng-click="next()" value="{{buttonText}}"-->
</div>

这在我的控制器中

 lycheeControllers.controller('quizCtrl', ['$scope', '$http', function ($scope, $http) {
    $http.get('json/questions.json').success(function (data) {
        //all questions
        $scope.questions = data;

        $scope.titel = "Check your knowledge about lychees"


        $scope.randomSort = function(question) {
                      return Math.random();
                    };

        //filter for getting answers / question
        $scope.ids = function (question) {
            return question.id == number;
        }

        $scope.find = function (id) {
            if (id == number) {
                return true;
            }
        }


        $scope.next = function () {
            if (!(number == (data.length))) {
                //questionId++;
                number++;
                if (correct == true) {
                    points++;
                }
                //alert(points);
            } else {
                if (!end) {
                    if (correct == true) {
                        points++;
                        end = true;
                    }
                }

                alert("Quiz finished: your total score is: " + points);
            }
            correct = false;
        }

        $scope.checked = function (answer) {
            //alert(answer.answer);

            if (answer.correct == "yes") {
                correct = true;
            } else {
                correct = false;
            }

            //alert(correct);
        }


    });

}])
;

不幸的是,这根本不起作用.希望有人可以帮助我这个吗？

Answer 1

谢谢 http://bost.ocks.org/mike/shuffle/ 使用这个改组函数:

与它相关的是,输入数组保持可绑定,因为混洗不会创建新数组,而是在同一引用上进行混洗.

// -> Fisher–Yates shuffle algorithm
var shuffleArray = function(array) {
  var m = array.length, t, i;

  // While there remain elements to shuffle
  while (m) {
    // Pick a remaining element…
    i = Math.floor(Math.random() * m--);

    // And swap it with the current element.
    t = array[m];
    array[m] = array[i];
    array[i] = t;
  }

  return array;
}

旁注: lodash _.shuffle(array)不起作用,因为他们正在创建一个破坏绑定的新数组(因此一个混洗数组不会触发模型变脏)

要完成工作解决方案的答案,请执行以下步骤:

• 复制该功能,以便您可以在控制器内使用它.
• 在$http结果回调中调用它:

$http.get('json/questions.json').success(function (data) {
  //all questions
  $scope.questions = data;

  shuffleArray($scope.questions);

  ...
}