如何在每3列角后添加行 [英] How to add Row after every 3 columns in angular

问题描述

我想做的是每3个div格后添加一行div

What i am trying to do is add a row div after every 3 colum divs

示例输出需求:

<div class="row">
     <div class="col-md-6"></div>
     <div class="col-md-6"></div>
     <div class="col-md-6"></div>
</div>

我有很多这样的产品要

<div class="row" *ngFor="let p of relatedProperties;let i = index">
    <div class="col-md-6"  *ngIf="relatedProperties[i].title !== undefined">{{ relatedProperties[i].title }}</div>
    <div class="col-md-6" *ngIf="relatedProperties[i].title !== undefined">{{ relatedProperties[i].title }}</div>
    <div class="col-md-6" *ngIf="relatedProperties[i].title !== undefined">{{ relatedProperties[i].title }}</div>
  </div>

但是问题是我的每一行在一次过滤中打印相同的标题，而在下一次过滤中打印第二个

But the problem is that my every row prints same title on one iltration and second on next iltration

当前输出

<div class="row">
     <div class="col-md-6">Title1</div>
     <div class="col-md-6">Title1</div>
     <div class="col-md-6">Title1</div>
</div>

<div class="row">
         <div class="col-md-6">Title2</div>
         <div class="col-md-6">Title2</div>
         <div class="col-md-6">Title2</div>
</div>

<div class="row">
             <div class="col-md-6">Title3</div>
             <div class="col-md-6">Title3</div>
             <div class="col-md-6">Title3</div>
</div>

所需的输出

<div class="row">
         <div class="col-md-6">Title1</div>
         <div class="col-md-6">Title2</div>
         <div class="col-md-6">Title3</div>
    </div>

    <div class="row">
             <div class="col-md-6">Title4</div>
             <div class="col-md-6">Title5</div>
             <div class="col-md-6">Title6</div>
    </div>

    <div class="row">
                 <div class="col-md-6">Title7</div>
                 <div class="col-md-6">Title8</div>
                 <div class="col-md-6">Title9</div>
    </div>

推荐答案

如果将数组拆分为总是具有3个titel的子数组，则可以在模板中轻松遍历该数组.

If you split your Array into subarrays with always 3 titel's then you can easy loop through this Array in your template.

https://ng-run.com/edit/zZsztdvTOTpzbUC5Buuj?open=app%2Fapp.component.ts

组件html

<div class="row" *ngFor="let row of newTitleArr; let i = index">
    <div class="col" *ngFor="let col of newTitleArr[i]">{{ col.title }}</div>
</div>

ts分量

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
  titleArr = [
    { title: 'title1' },
    { title: 'title2' },
    { title: 'title3' },
    { title: 'title4' },
    { title: 'title5' },
    { title: 'title6' },
    { title: 'title7' },
    { title: 'title8' },
    { title: 'title9' },
    { title: 'title10' },
    { title: 'title11' },
    { title: 'title12' },
    { title: 'title13' },
  ];

  newTitleArr:any[];

  ngOnInit() {
     this.newTitleArr = this.splitArr(this.titleArr, 3)
  }

  splitArr(arr, size) {
     let newArr = [];
     for(let i = 0; i< arr.length; i += size) {
       newArr.push(arr.slice(i, i+size));
     }
     return newArr;
  }
}

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