Exploring table iteration in Angular 7

Question

Exploring table iteration in Angular 7

I am looking to create a table with one property per cell, but I want each row to contain 4 cells before moving on to the next row...

This is what I want:

<table>
      <tr>
        <td>
          <mat-checkbox>1</mat-checkbox>
        </td>
        <td>
          <mat-checkbox>2</mat-checkbox>
        </td>
        <td>
          <mat-checkbox>3</mat-checkbox>
        </td>
        <td>
          <mat-checkbox>4</mat-checkbox>
        </td>
      </tr>
      <tr>
        <td>
          <mat-checkbox>5</mat-checkbox>
        </td>
        <td>
          <mat-checkbox>6</mat-checkbox>
        </td>
        <td>
          <mat-checkbox>7</mat-checkbox>
        </td>
      </tr>
    </table>

I attempted the following code, but all values appear in a single column:

lista = [
    { value: "1" },
    { value: "2" },
    { value: "3" },
    { value: "4" },
    { value: "5" },
    { value: "6" },
    { value: "7" },

<table *ngFor="let list of lista">
   <tr>
     <td>
       <mat-checkbox>{{ list.value }}</mat-checkbox>
     </td>
   </tr>
</table>

javascript angular typescript loops angular-template

Answer 1

Answer №1

To start, organize your array into groups of 4 (chunk size), then proceed to loop through it in your template.

Within your component:

const data = [
    { value: "1" },
    { value: "2" },
    { value: "3" },
    { value: "4" },
    { value: "5" },
    { value: "6" },
    { value: "7" }
];

const chunkSize = 4;

// Divide the data into chunks of 4 and filter out any falsy values
const groups = data
.map((item, index) => { 
     return index % chunkSize === 0 ? data.slice(index, index + chunkSize): null; 
})
.filter(item => item);

Incorporate the following structure into your template:

<table >
   <tr *ngFor="let items of groups">
     <td *ngFor = "let innerItems of items">
       <mat-checkbox>{{ innerItems.value }}</mat-checkbox>
     </td>
   </tr>
</table>

Answer 2

To start, organize your array into groups of 4 (chunk size), then proceed to loop through it in your template.

Within your component:

const data = [
    { value: "1" },
    { value: "2" },
    { value: "3" },
    { value: "4" },
    { value: "5" },
    { value: "6" },
    { value: "7" }
];

const chunkSize = 4;

// Divide the data into chunks of 4 and filter out any falsy values
const groups = data
.map((item, index) => { 
     return index % chunkSize === 0 ? data.slice(index, index + chunkSize): null; 
})
.filter(item => item);

Incorporate the following structure into your template:

<table >
   <tr *ngFor="let items of groups">
     <td *ngFor = "let innerItems of items">
       <mat-checkbox>{{ innerItems.value }}</mat-checkbox>
     </td>
   </tr>
</table>

Answer 3

Answer №2

If you want to create a table using a 2d array, you can follow this structure:

  data = [
[
  {value: '1'},
  {value: '2'},
  {value: '3'},
  {value: '4'}
],

[
  {value: '5'},
  {value: '6'},
  {value: '7'},
  {value: '8'}
]
 ];

When it comes to displaying it in HTML, you can use the following code:

<table >
  <tr *ngFor="let row of data">
    <td *ngFor="let col of row">
      <mat-checkbox>{{ col.value }}</mat-checkbox>
    </td>
  </tr>
</table>

Answer 4

If you want to create a table using a 2d array, you can follow this structure:

  data = [
[
  {value: '1'},
  {value: '2'},
  {value: '3'},
  {value: '4'}
],

[
  {value: '5'},
  {value: '6'},
  {value: '7'},
  {value: '8'}
]
 ];

When it comes to displaying it in HTML, you can use the following code:

<table >
  <tr *ngFor="let row of data">
    <td *ngFor="let col of row">
      <mat-checkbox>{{ col.value }}</mat-checkbox>
    </td>
  </tr>
</table>

Answer 5

Answer №3

To create a table layout where each row contains four elements, you can adjust the iteration logic in your Angular template. Check out the revised code below:

<table>
  <tr *ngFor="let item of items; let i = index">
    <ng-container *ngIf="i % 4 === 0">
      </tr><tr>
    </ng-container>
    <td>
      <mat-checkbox>{{ item.value }}</mat-checkbox>
    </td>
  </tr>
</table>

In this updated snippet, a new row is opened and closed every four iterations within the loop. This ensures that each row consists of exactly four checkboxes.

The condition i % 4 === 0 determines when to start a fresh row by checking if the current index (i) is divisible by 4. If true, the closing and opening tags are applied accordingly.

Adopting this method guarantees that the items will be organized into rows with four checkboxes per row until all items have been processed.

Answer 6

To create a table layout where each row contains four elements, you can adjust the iteration logic in your Angular template. Check out the revised code below:

<table>
  <tr *ngFor="let item of items; let i = index">
    <ng-container *ngIf="i % 4 === 0">
      </tr><tr>
    </ng-container>
    <td>
      <mat-checkbox>{{ item.value }}</mat-checkbox>
    </td>
  </tr>
</table>

In this updated snippet, a new row is opened and closed every four iterations within the loop. This ensures that each row consists of exactly four checkboxes.

The condition i % 4 === 0 determines when to start a fresh row by checking if the current index (i) is divisible by 4. If true, the closing and opening tags are applied accordingly.

Adopting this method guarantees that the items will be organized into rows with four checkboxes per row until all items have been processed.

Exploring table iteration in Angular 7

Answer №1

Answer №2

Answer №3

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