如何将使用ngfor打印的数据拆分为3列(角)？

Question

数据

const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30];

我希望将这些数据拆分为3列，并按如下方式应用：

<ul>
    <li>1</li>
    <li>2</li>
    <li>3</li>
    ...
    <li>10</li>
</ul>
<ul>
    <li>11</li>
    <li>12</li>
    <li>13</li>
    ...
    <li>20</li>
</ul>
<ul>
    <li>21</li>
    <li>22</li>
    <li>23</li>
    ...
    <li>30</li>
</ul>

当使用ngfor时，如何分割数据？

<ul *ngFor="let item of arr">
    <li>{{item}}</li>
</ul>

Answer 1

首先，应该是这样的：

<ul>
    <li *ngFor="let item of arr">{{item}}</li>
</ul>

并将其添加到CSS中：

ul{
    -webkit-columns: 3;
    -moz-columns: 3;
    columns: 3;
}

Answer 2

您可以使用切片：

<ul>
  <li *ngFor="let item of arr.slice(0,10)">{{item}}</li>
</ul>

<ul>
  <li *ngFor="let item of arr.slice(10,20)">{{item}}</li>
</ul>

<ul>
 <li *ngFor="let item of arr.slice(20,30)>{{item}}</li>
</ul>

Answer 3

function chunkArray(myArray, chunk_size){
    var results = [];

    while (myArray.length) {
        results.push(myArray.splice(0, chunk_size));
    }    
    return results;
}

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30];

// Split in group of 3 items
arr = chunkArray(arr, 3);

在HTML中添加嵌套*ngFor

<ul *ngFor="let chunckedArr of arr">
    <li *ngFor="let item of chunckedArr">{{item}}</li>
</ul>