如果选中相同的复选框，如何循环两个数组并进行比较Angular 2

Question

我有一个包含所有办公室列表的数组。另一个数组是用户选择的列表。所以现在我想显示所有 officelist，如果所选列表中的值与 office list 相同，则将选中该复选框。我就是这样做的。
代码

<div *ngFor="let item of officeLIST">
  <div *ngFor="let officeDATA of allOffice.office">
    <div *ngIf="item.office_id == officeDATA.office_id">
      <input #officeArray type="checkbox" id="officeArray" name="officeArray" class="form-control" value="{{item.officename}}"
        checked> {{(item.officename == "" ? "--No data--" : item.officename)}}
    </div>
    <div *ngIf="item.office_id != officeDATA.office_id">
      <input #officeArray type="checkbox" id="officeArray" name="officeArray" class="form-control" value="{{item.officename}}">      {{(item.officename == "" ? "--No data--" : item.officename)}}
    </div>
  </div>
</div>

结果是

我的办公室列表

this.officeLIST = [
  { "office_id": "1", "officename": "Sun Dept" },
  { "office_id": "2", "officename": "Moon" },
  { "office_id": "3", "officename": "Stars" }
]

allOffice.office 数组

"office": [
    {
      "office_id": "1",
      "officename": "Sun Dept"
    },
    {
      "office_id": "2",
      "officename": "Moon Dept"
    }
  ]

Answer 1

使用这个解决方案。这对我来说很好。我已经在构造函数中完成了所有的事情。如果你想在一个方法中这样做，只需使用构造函数中的代码块。

这是我的 ts 文件：

  officeLIST: Array<any> = [
    { "office_id": "1", "officename": "Sun Dept" },
    { "office_id": "2", "officename": "Moon" },
    { "office_id": "3", "officename": "Stars" }
  ];


  office: Array<any> = [
    {
      "office_id": "1",
      "officename": "Sun Dept"
    },
    {
      "office_id": "2",
      "officename": "Moon Dept"
    }
  ];
  newArray: Array<any> = [];
  constructor() {
    for (var i = 0; i < this.officeLIST.length; i++) {

      var ismatch = false; // we haven't found it yet

      for (var j = 0; j < this.office.length; j++) {

        if (this.officeLIST[i].office_id == this.office[j].office_id) {
          // we have found this.officeLIST[i]] in this.office, so we can stop searching
          ismatch = true;
          this.officeLIST[i].checked = true;//  checkbox status true
          this.newArray.push(this.officeLIST[i]);
          break;
        }//End if
        // if we never find this.officeLIST[i].office_id in this.office, the for loop will simply end,
        // and ismatch will remain false
      }
      // add this.officeLIST[i] to newArray only if we didn't find a match.
      if (!ismatch) {
        this.officeLIST[i].checked = false;//  checkbox status false
        this.newArray.push(this.officeLIST[i]);
      } //End if
    }
    console.log(this.newArray);

  }

这是我的html：

<div *ngFor="let item of newArray">
  <input type="checkbox" [checked]="item.checked"> {{item.officename}}
</div>

Answer 2

您的用户选择的数组将具有选定复选框的 ID。 假设他选择了太阳系和月亮，那么

this.userSelectedArray = ["1","2"];

<div *ngFor="let item of officeLIST">
      <input type="checkbox" [attr.checked]="userSelectedArray.indexOf(item.office_id) !== -1 ? true : false">
    </div>