Javascript 循环遍历 JSON 对象

Question

我想做的事情超出了我的知识范围。感谢大家的时间和帮助，很高兴得到如此庞大的开发者社区的支持。

问题

我需要遍历一个对象（JSON 响应）以确定哪些数据为真，然后使用结果编辑 html。

json 对象是：

  var data = {
  "total": 4,
  "limit": 50,
  "questions": [{
    "date_created": "2015-06-29T18:24:25.000-04:00",
    "item_id": "MLA567045929",
    "seller_id": 186626557,
    "status": "UNANSWERED",
    "text": "Pregunta de Testeo, user 2.",
    "id": 3612747353,
    "deleted_from_listing": false,
    "hold": false,
    "answer": null,
    "from": {
      "id": 186625262,
      "answered_questions": 0
    }
  }, {
    "date_created": "2015-06-29T18:30:16.000-04:00",
    "item_id": "MLA567045929",
    "seller_id": 186626557,
    "status": "UNANSWERED",
    "text": "Lorem ipsum dolor sit amet",
    "id": 3612938882,
    "deleted_from_listing": false,
    "hold": false,
    "answer": null,
    "from": {
      "id": 186625262,
      "answered_questions": 0
    }
  }, {
    "date_created": "2015-06-29T18:30:35.000-04:00",
    "item_id": "MLA567045929",
    "seller_id": 186626557,
    "status": "UNANSWERED",
    "text": "an est odio timeam quaerendum",
    "id": 3612752695,
    "deleted_from_listing": false,
    "hold": false,
    "answer": null,
    "from": {
      "id": 186625262,
      "answered_questions": 0
    }
  }, {
    "date_created": "2015-06-29T18:31:32.000-04:00",
    "item_id": "MLA567045929",
    "seller_id": 186626557,
    "status": "ANSWERED",
    "text": "Responder esta pregunta",
    "id": 3612753455,
    "deleted_from_listing": false,
    "hold": false,
    "answer": {
      "text": "Pregunta respondida",
      "status": "ACTIVE",
      "date_created": "2015-06-29T18:31:58.000-04:00"
    },
    "from": {
      "id": 186625262,
      "answered_questions": 1
    }
  }],
  "filters": {
    "limit": 50,
    "offset": 0,
    "is_admin": false,
    "sorts": [],
    "caller": 186626557,
    "seller": "186626557"
  },
  "available_filters": [{
    "id": "item",
    "name": "Item",
    "type": "text"
  }, {
    "id": "from",
    "name": "From user id",
    "type": "number"
  }, {
    "id": "totalDivisions",
    "name": "total divisions",
    "type": "number"
  }, {
    "id": "division",
    "name": "Division",
    "type": "number"
  }, {
    "id": "status",
    "name": "Status",
    "type": "text",
    "values": ["BANNED", "CLOSED_UNANSWERED", "DELETED", "DISABLED", "UNDER_REVIEW"]
  }],
  "available_sorts": ["item_id", "from_id", "date_created", "seller_id"]
};

我要找的结果是：

在数据对象中，我需要提取状态为unanswered 的questions 以及与这些未回答问题相关联的id 字段。

 "questions1":[{  "status" : "UNANSWERED",
                "id" : 3612747353}],
"questions2":[{  "status" : "UNANSWERED",
                "id" : 3612938882}],
 ...

根据我的搜索，我尝试了循环、for in 和每个都没有成功。

关于如何达到预期结果的任何建议或想法？我需要将此示例应用于多个对象。

Answer 1

尝试一些方便的列表处理函数来在概念上简化它。 filter 和 map 函数会有所帮助。我提供的过滤功能告诉它只让满足未回答状态的项目通过。我提供的 map 函数将所有从过滤器中出来的对象都变成了它们的 id。

data["questions"].filter(function(obj) {
    return obj["status"] === "UNANSWERED";
}).map(function(obj) {
    return obj["id"];
});

Answer 2

您可以遍历问题并将所需的 id 保存到数组中：

var questions = data.questions;
var unanswered = [];
for(var i = 0, len = questions.length; i < len; i++) {
    if(questions[i].status === 'UNANSWERED') {
        unanswered.push(questions[i].id);
    }
}

unanswered 将是一组未回答的问题 ID。您不需要保存状态；你知道他们都是“未回答的”。

Answer 3

var results = [];
for (var question in data.questions) {
  if (data.questions[question].status === "UNANSWERED") {
    results.push({
      "status" : data.questions[question].status,
      "id" : data.questions[question].id
    });
  }
}

// Now results contains an array of unanswered questions,
// with just their status & id.