Question

我正在尝试更新数组中的一个值。基本上我想更新数组中一个对象的状态值。这是我的数组

[
  {
    "projects": {
      "projectname": "one",
      "dateadded": "16 April 2018, 7:23AM",
      "status": 1
    }
  },
  {
    "projects": {
      "projectname": "two",
      "dateadded": "16 April 2018, 7:23AM",
      "status": 1
    }
  },
  {
    "projects": {
      "projectname": "three",
      "dateadded": "16 April 2018, 7:32AM",
      "status": 1
    }
  }
]

这是我的尝试，但它会更新数组中的所有内容。参数1是项目的名称 - 以查看我是否在正确的项目上

archive(){

    var parameter1 = this.navParams.get('param1');

    this.storage.get('projectsStore').then(data => {

      for (var i = 0; i < data.length; i++) {
        if (data[i].projects.projectname == parameter1) {
          this.project = [{ "projectname":data[i].projects.projectname, "dateadded":data[i].projects.dateadded, "location":data[i].projects.location, "status":0 }];
        }
      }

    });

    this.storage.set( 'projectsStore', this.project );

}

所以要澄清这是我想要实现的目标。让我们说用户执行项目3的归档功能，然后阵列需要看起来像这样（项目3的状态更新，但项目1和2没有更新）

[
  {
    "projects": {
      "projectname": "one",
      "dateadded": "16 April 2018, 7:23AM",
      "status": 1
    }
  },
  {
    "projects": {
      "projectname": "two",
      "dateadded": "16 April 2018, 7:23AM",
      "status": 1
    }
  },
  {
    "projects": {
      "projectname": "three",
      "dateadded": "16 April 2018, 7:32AM",
      "status": 0
    }
  }
]

Answer 1

如果您想更新status === projectname的{{1}}，您可以

＆＃13;

parameter1

＆＃13;

Answer 2

试试这个

function updateProject(projectName){
    let toBeUpdated = projects.find(item => item.projects.projectname === projectName);
    toBeUpdated && (toBeUpdated.projects.status = 0);
}

Answer 3

恕我直言，您应该修改您的JSON架构。作为一个对象数组是好的，但保持“项目”作为一个关键对我来说似乎不合逻辑。您可以将项目名称作为项目JSON对象的键，而不是这样。看起来应该是这样的：

public invokeEdit(event: MouseEvent): void {          
 console.log(event); 
 event.stopPropagation();
}

此结构可让您轻松更新任何项目的状态。拥有此结构后，您可以使用以下函数更新单个项目的状态：

[
  {
    "one": {
      "dateadded": "16 April 2018, 7:23AM",
      "status": 1
    }
  },
  {
    "two": {
      "dateadded": "16 April 2018, 7:23AM",
      "status": 1
    }
  },
  {
    "three": {
      "dateadded": "16 April 2018, 7:32AM",
      "status": 1
    }
  }
]

更新数组中一个对象的值

3 个答案: