css - Angular 2 : displaying items in row/column fashion

Question

我有一个格式如下的数组，其中第一个参数是要显示的文本，第二个是列号，第三个是行号。我想根据它们的列和行位置显示这些元素。

[[ "a",  "0", "0"],
["b", "0", "1"],
["c", "0", "2"],
["d", "1", "0"],
["e", "1", "1"],
["f", "2", "0"],
["g", "2", "1"]

]

期望的输出:

a d f
b e g
c

Answer 1

你可以这样做: Plunker

组件:

  value : string;
  rows : any[];
  cols : any[];
  arr : any = [[ "a",  "0", "0"],
    ["b", "0", "1"],
    ["c", "0", "2"],
    ["d", "1", "0"],
    ["e", "1", "1"],
    ["f", "2", "0"],
    ["g", "2", "1"]];

  constructor() { 
    this.rows = Array(3).fill();
    this.cols = Array(3).fill();
  }

  activeElement(r,c) : string{
    for(let elem of this.arr){
      if(parseInt(elem[1]) === c && parseInt(elem[2]) === r){
        console.log(true);
        return elem[0];
      }
    }
    return ""
  }

模板:

<div *ngFor="let row of rows; let rowId = index">
 <span *ngFor="let col of cols; let colId = index">
   {{activeElement(rowId,colId)}}
 </span>
</div>