将特定的JSON数组存储在变量中

Question

我有一个像这样的JSON对象：

{
  "workouts":
  [
    {
      "title": "Full Body",
      "exercises":
      [
        {
          "name": "Push Ups",
          "duration": 3,
          "break": 3
        },
        {
          "name": "Squats",
          "duration": 3,
          "break": 3
        },
        {
          "name": "Running in Place",
          "duration": 3,
          "break": 3
        }
      ]
    },
    {
      "title": "God Legs",
      "exercises":
      [
        {
          "name": "Running in Place (High Knees)",
          "duration": 3,
          "break": 3
        },
        {
          "name": "Squats",
          "duration": 3,
          "break": 3
        },
        {
          "name": "Clams",
          "duration": 3,
          "break": 3
        }
      ]
    },
    {
      "title": "Morning Stretch",
      "exercises":
      [
        {
          "name": "Downward Dog",
          "duration": 3,
          "break": 3
        },
        {
          "name": "Face Plant",
          "duration": 3,
          "break": 3
        },
        {
          "name": "Warrior",
          "duration": 3,
          "break": 3
        }
      ]
    }
  ]
}

我正在循环这个对象，并创建包含每个锻炼的标题的信息卡（“全身”，“上帝腿”等）。

点击其中一张牌后，我希望能够将与每个标题相关的练习存储到变量中以供进一步使用。 例如，如果我点击“God Legs”，我希望变量存储： "[{'name':'Running in Place (High Knees)', 'duration':3, 'break':3},{'name':'Squats', 'duration':3, 'break':3},{'name': 'Clams', 'duration':3, 'break':3}]"

这是我用来循环遍历JSON数据的代码，该数据存储在Firebase实时数据库中，并创建信息卡。

JavaScript的：

// Initialize Firebase.
firebase.initializeApp(config);
// Reference data.
var dbRef = firebase.database().ref().child("workouts");
// Sync with Firebase in real time.
dbRef.on("value", snap =>
{

  var workouts = snap.val();

  for (var i = 0;  i < workouts.length; i++)
  {
    //display.innerHTML = exercises[0].name;
    var routine = workouts[i].title;
    var id = "card" + i;

    var $card = ("<li><div class='card' id=" + id + "><a class='startIt' href='timer.html'>\n\
    <div class='cardInfo'><h3>" + routine + "</h3><p>10 min.</p>\n\
    </div></a><a class='cardOptions' href='overview.html'>\n\
    </a></div></li>");

    $("#cardList").append($card);
  }
});

HTML：

<ul id="cardList" class="cards"></ul>

感谢您的帮助和想法！

Answer 1

你可以使用find

相关守则

workouts.find(workout => workout.title === [insert title you are looking for])

例

 const json = { "workouts": [{ "title": "Full Body", "exercises": [{ "name": "Push Ups", "duration": 3, "break": 3 }, { "name": "Squats", "duration": 3, "break": 3 }, { "name": "Running in Place", "duration": 3, "break": 3 } ] }, { "title": "God Legs", "exercises": [{ "name": "Running in Place (High Knees)", "duration": 3, "break": 3 }, { "name": "Squats", "duration": 3, "break": 3 }, { "name": "Clams", "duration": 3, "break": 3 } ] }, { "title": "Morning Stretch", "exercises": [{ "name": "Downward Dog", "duration": 3, "break": 3 }, { "name": "Face Plant", "duration": 3, "break": 3 }, { "name": "Warrior", "duration": 3, "break": 3 } ] } ] } function createButton(value) { const button = document.createElement('button') button.textContent = value return button } function append(parentQuery, childNode) { document.querySelector(parentQuery).append(childNode) } // log the right object on click function handleButtonClick(event) { if (event.target != event.currentTarget) { console.log(json.workouts.find(workout => workout.title === event.target.textContent)) } } // display the buttons json.workouts.forEach(workout => append('#workout_section', createButton(workout.title))) // eventlistener document.querySelector('#workout_section').addEventListener('click', handleButtonClick) 

 <section id="workout_section"></section> 

编辑 - 按HTML属性搜索

您可以添加HTML元素自定义属性，如data-workout 。 现在，您可以通过搜索此属性来使用find 。

// add attribute
button.setAttribute('data-workout', value)

// find attribute
json.workouts.find(workout => workout.title === event.target.dataset.workout)

 const json = { "workouts": [{ "title": "Full Body", "exercises": [{ "name": "Push Ups", "duration": 3, "break": 3 }, { "name": "Squats", "duration": 3, "break": 3 }, { "name": "Running in Place", "duration": 3, "break": 3 } ] }, { "title": "God Legs", "exercises": [{ "name": "Running in Place (High Knees)", "duration": 3, "break": 3 }, { "name": "Squats", "duration": 3, "break": 3 }, { "name": "Clams", "duration": 3, "break": 3 } ] }, { "title": "Morning Stretch", "exercises": [{ "name": "Downward Dog", "duration": 3, "break": 3 }, { "name": "Face Plant", "duration": 3, "break": 3 }, { "name": "Warrior", "duration": 3, "break": 3 } ] } ] } function createButton(value) { const button = document.createElement('button') button.textContent = value button.setAttribute('data-workout', value) return button } function append(parentQuery, childNode) { document.querySelector(parentQuery).append(childNode) } // log the right object on click function handleButtonClick(event) { if (event.target != event.currentTarget) { console.log(json.workouts.find(workout => workout.title === event.target.dataset.workout)) } } // display the buttons json.workouts.forEach(workout => append('#workout_section', createButton(workout.title))) // eventlistener document.querySelector('#workout_section').addEventListener('click', handleButtonClick) 

 <section id="workout_section"></section> 

编辑 - for循环

我在div添加了data-workout="${routine}"

<li>
    <div class="card" id="${id}" data-workout="${routine}">`
    [...]
</li>

并在每张卡上添加eventlistener

$(".card").on('click', handleButtonClick)

 const routines = { "workouts": [{ "title": "Full Body", "exercises": [{ "name": "Push Ups", "duration": 3, "break": 3 }, { "name": "Squats", "duration": 3, "break": 3 }, { "name": "Running in Place", "duration": 3, "break": 3 } ] }, { "title": "God Legs", "exercises": [{ "name": "Running in Place (High Knees)", "duration": 3, "break": 3 }, { "name": "Squats", "duration": 3, "break": 3 }, { "name": "Clams", "duration": 3, "break": 3 } ] }, { "title": "Morning Stretch", "exercises": [{ "name": "Downward Dog", "duration": 3, "break": 3 }, { "name": "Face Plant", "duration": 3, "break": 3 }, { "name": "Warrior", "duration": 3, "break": 3 } ] } ] } // log the right object on click function handleButtonClick(event) { if (event.target != event.currentTarget) { console.log(routines.workouts.find(workout => workout.title === event.currentTarget.dataset.workout)) console.log(routines.workouts) } } function appendElement(htmlString, parentQuery) { $(parentQuery).append(htmlString) } function createCardsHtmlString(id, routine) { return ` <li> <div class="card" id="${id}" data-workout="${routine}"> <a class="startIt" href="#"> <div class="cardInfo"> <h3>${routine}</h3> <p>10 min.</p> </div> </a> <a class="cardOptions" href="#"></a> </div> </li> ` } for (var i = 0; i < routines.workouts.length; i++) { var routine = routines.workouts[i].title; var exercises = routines.workouts[i].exercises var id = "card" + i; $("#cardList").append(createCardsHtmlString(id, routine)); } $(".card").on('click', handleButtonClick) 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <ul id="cardList"></ul>