Incorporate dynamic HTML into Angular by adding CSS styling

Just starting out with Angular and have limited front-end experience. I'm feeling a bit lost on how to proceed. Currently, I have a mat-table with a static datasource (will connect to a database in the future), and I need to dynamically change the background color of cells in a specific column based on whether they display "pass" or "fail." Where should I begin with this task? I've grasped the basic logic:

if (result == "pass") { add green styling}
else {add red styling}

But how can I implement this in reality using Angular? Any guidance would be appreciated.

Answer №1

try out this example :

  <div [ngStyle]="{'color': answer === 'correct' ? 'blue' : 'orange' }"></<div>

Answer №2

To achieve this effect, consider utilizing NgStyle as the most suitable method. Below is an example to demonstrate:

<div [ngStyle]="{'background-color': status === 'success' ? 'green' : 'red' }"></<div>

When the status is 'success', the background color of your div will be green; otherwise, it will be red.

For additional insights, feel free to visit this link.

Answer №3

As no reproducible example was provided, let's refer to a sample from the official Angular Material table documentation.

In this scenario, you have the flexibility to apply custom styles to individual cells based on specific conditions:

component.ts

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

export interface PeriodicElement {
  name: string;
  position: number;
  weight: number;
  symbol: string;
}

const ELEMENT_DATA: PeriodicElement[] = [
  { position: 1, name: 'Hydrogen', weight: 1.0079, symbol: 'H' },
  { position: 2, name: 'Helium', weight: 4.0026, symbol: 'He' },
  { position: 3, name: 'Lithium', weight: 6.941, symbol: 'Li' },
  { position: 4, name: 'Beryllium', weight: 9.0122, symbol: 'Be' },
  { position: 5, name: 'Boron', weight: 10.811, symbol: 'B' },
  { position: 6, name: 'Carbon', weight: 12.0107, symbol: 'C' },
  { position: 7, name: 'Nitrogen', weight: 14.0067, symbol: 'N' },
  { position: 8, name: 'Oxygen', weight: 15.9994, symbol: 'O' },
  { position: 9, name: 'Fluorine', weight: 18.9984, symbol: 'F' },
  { position: 10, name: 'Neon', weight: 20.1797, symbol: 'Ne' },
];

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
})
export class AppComponent {
  name = 'Angular ' + VERSION.major;
  displayedColumns: string[] = ['position', 'name', 'weight', 'symbol'];
  dataSource = ELEMENT_DATA;
}

HTML template

<table mat-table [dataSource]="dataSource" class="mat-elevation-z8">
  <ng-container matColumnDef="position">
    <th mat-header-cell *matHeaderCellDef>No.</th>
    <td mat-cell *matCellDef="let element">{{ element.position }}</td>
  </ng-container>

  <ng-container matColumnDef="name">
    <th mat-header-cell *matHeaderCellDef>Name</th>
    <td mat-cell *matCellDef="let element">{{ element.name }}</td>
  </ng-container>

  <ng-container matColumnDef="weight">
    <th mat-header-cell *matHeaderCellDef>Weight</th>
    <td mat-cell *matCellDef="let element">{{ element.weight }}</td>
  </ng-container>

  <!-- Custom Styling -->
  <ng-container matColumnDef="symbol">
    <th mat-header-cell *matHeaderCellDef>Symbol</th>
    <td 
      [ngStyle]="{ 
        'background-color: element.symbol === 'pass' ? red : green' 
      }" 
      mat-cell 
      *matCellDef="let element">{{ element.symbol }}
    </td>
  </ng-container>

  <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
  <tr mat-row *matRowDef="let row; columns: displayedColumns"></tr>
</table>

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