javascript - 如何使用 Angular 获取对象内属性的长度

Question

我有一个名为programs的json对象。在这个对象中，我有一个键/值数组。我需要计算有多少对象具有“status”的键/值:“Review”。所以这里我们有 4 个对象，其中两个具有“状态”:“审核”。我需要像这样返回这个计数 (2)

{
    "id": 3,
    "organizationName": "Watertown School",
      "programs": [
          {
              "id": 72,
              "programId": 456456,
              "programName": "name 1",
              "programType": "Phd",
              "applicationType": "Domestic",
              "concentration": "Medicine",
              "formId": 0,
              "isReviewed": true,
              "status": "Review"
          },
          {
              "id": 73,
              "programId": 4564561,
              "programName": "name 2",
              "programType": "Phd",
              "applicationType": "Domestic",
              "concentration": "Medicine",
              "formId": 0,
              "isReviewed": true,
              "status": "Draft"
          },
          {
              "id": 74,
              "programId": 10343431,
              "programName": "name 3",
              "programType": "Phd",
              "applicationType": "Domestic",
              "concentration": "Medicine",
              "formId": 0,
              "isReviewed": true,
              "status": "Review"
          },
          {
              "id": 75,
              "programId": 10031,
              "programName": "namw 4",
              "programType": "Phd",
              "applicationType": "Domestic",
              "concentration": "Medicine",
              "formId": 0,
              "isReviewed": true,
              "status": "Draft"
          },
      ]
}

Answer 1

取决于你在哪里需要这个？如果它在 dom 中，你可以这样做:

{{ (myObject.programs | filter:{ status: 'Review' }).length }}

这是一个 jsFiddle 显示它:http://jsfiddle.net/2jx5oL78/