Question

我在显示的测验中有很多问题。所有值都来自json对象，结构为：

sections: [
 subSections:[
  "questions":[
     "title":"a",
     "number":"b",
     "name":"c",
     "answers":[
       {
        "answerKey": "true",
        "answerLabel": "true"
       },
       {
         "answerKey": "false",
         "answerLabel": "false"
       }
     ]
   ] 
 ]
]

我想要完成的是在先前编写的函数中从数组中获取这些值：

function getRandomFiveQuestions(questionArray){
            var returnArray = [];
            var loopLength;
            loopLength = questionArray.length >= 5 ? 5 : questionArray.length;
            outerLoop:
            for(i=0; i<loopLength; i++){//do this 5 times
                var randomIndex = Math.round(Math.random() * questionArray.length); //get a random whole number between 0 and the array length
                if(returnArray.length != 0){ //if the list of questions we're compiling already has items
                    for(j=0; j<returnArray.length; j++){//loop through the return array
                        if(returnArray[j]==questionArray[randomIndex]){ //if the random item is already in the return array
                            i--; //redo this step in the outer loop, which will get a new random number and try again
                            continue outerLoop; //skip everything else in the outer loop
                        }
                    }
                    //if we've gotten to the end of the inner loop and a duplicate wasn't found, we'll run this code
                    //which will add the random item to the return array
                    returnArray.push(questionArray[randomIndex]);
                }
                else{ //if there are no items in the return array yet
                    //add the item to the return array
                    returnArray.push(questionArray[randomIndex]);
                }

                //console.log(returnArray[i]);
            }

            //when we're done looping, return the resulting array
            return returnArray;
        };

然后提交比较答案，以便如果其中任何一个为真，那么真正的组合将以％显示得分。

要选择的选项显示在单选按钮中。

我很想知道如何用JS实现这一目标。我已经获得了很多帮助，以前的功能，抓住一个数组，现在我只考虑一般概念，并不能真正提出任何可靠的东西。仍然学习JS。

Answer 1

我的方法，因为我不太确定设置（我可能只是累了）：

angular.module('quizApp', []);

angular.module('quizApp').controller('QuizCtrl',
  function() {
    var ctrl = this;

    this.selectedAnswers = {};

    this.questions = [{
      'title': 'Question 1 ?',
      'answers': [{
        'title': 'Answer 1',
        'correct': false,
      }, {
        'title': 'Answer 2',
        'correct': true,
      }]
    }, {
      'title': 'Question 2 ?',
      'answers': [{
        'title': 'Answer 1',
        'correct': false,
      }, {
        'title': 'Answer 2',
        'correct': true,
      }]
    }]

    this.validate = function() {
      ctrl.correctAnswers = 0;
      ctrl.totalQuestions = ctrl.questions.length;

      for (var answer in ctrl.selectedAnswers) {
        answerObj = ctrl.selectedAnswers[answer]
        if (answerObj.correct) {
          ctrl.correctAnswers += 1;
        }
      }



    }
  })

<div ng-app='quizApp' ng-controller='QuizCtrl as qCtrl'>
  <div ng-repeat='question in qCtrl.questions'>
    <p>{{ question.title }}</p>
    <div ng-repeat='answer in question.answers'>
      <input type='radio' name='{{question.title}}' ng-model='qCtrl.selectedAnswers[question.title]' ng-value='answer'>{{ answer.title }}
    </div>
  </div>
  <br>
  <button ng-click='qCtrl.validate()'>Validate answers</button>

  <p ng-if='qCtrl.totalQuestions'>
    {{ qCtrl.correctAnswers }}/{{ qCtrl.totalQuestions }} were correct
  </p>
</div>

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

通过AngularJS和json对象对测验进行评分

1 个答案: