Issue in property binding in Angular through array

Question

I wanted to render three cards with given contents in array using string interpollation. As well as set the style property of the specific card according to the given string in the array.

But I am having issue setting style property to my card. Issue is whenever I try to set style using string interpolation my view just displays blank.

 <div class="row-sm-2" *ngFor="let post of classifications">
     <mat-card style={{ post.margin }}>
         <p style="color: #62697D;">{{ post.content }}</p>
     </mat-card>
 </div>

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


@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {

  classifications = [
    {margin: '0px; width: 100%', content: 'Hello there'},
    {margin: '20px; width: 100%', content: 'Hi there'},
    {margin: '20px; width: 100%', content: 'Well its angular'}
  ];

}

missing quotes? <mat-card style="{{ post.margin }}"> Also check the console. — Antoniossss
– Antoniossss, Commented Jun 18, 2020 at 6:17

Antoniossss · Accepted Answer · 2020-06-18 06:20:58Z

2

First, you are missing quotes, <mat-card style="{{ post.margin }}">

Secondly, this will resolve to a rubish markup like

<mat-card style="0px; width: 100%"> which is invalid - 0px of what?

use ngStyle to set element style dynamically.

answered Jun 18, 2020 at 6:20

Antoniossss

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1 Comment

50_Seconds _Of_Coding Over a year ago

Yeh I did saw that mistake and corrected it. But ngStyle is not working in my case. Instead I just only used [style]

Barremian · Accepted Answer · 2020-06-18 06:27:31Z

1

Either enclose it in quotations, or bind to [style]. Also it'd be better to structure the data the following way and access the styles using post.style instead of post.margin.

classifications = [
  {style: 'margin: 0px, width: 100%', content: 'Hello there'},
  {style: 'margin: 20px, width: 100%', content: 'Hi there'},
  {style: 'margin: 20px, width: 100%', content: 'Well its angular'}
];

<div class="row-sm-2" *ngFor="let post of classifications">
  <mat-card style="{{ post.style }}">
    <p style="color: #62697D;">{{ post.content }}</p>
  </mat-card>
</div>

Or

<div class="row-sm-2" *ngFor="let post of classifications">
  <mat-card [style]="post.style">
    <p style="color: #62697D;">{{ post.content }}</p>
  </mat-card>
</div>

edited Jun 18, 2020 at 6:27

answered Jun 18, 2020 at 6:20

Barremian

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2 Comments

50_Seconds _Of_Coding Over a year ago

Well first solution doesn't works. And your second solution is pretty much close to the answer. Instead of [ngStyle] I only used [style] and it worked.

Barremian Over a year ago

Yeah I've edited the answer. [ngStyle] expects an object as input. But you might have to modify the actual string that denotes the style. '0px; width: 100%' isn't a valid style.

50_Seconds _Of_Coding · Accepted Answer · 2020-06-18 06:22:24Z

0

<div class="row-sm-2" *ngFor="let post of classifications">
    <mat-card [style]= 'post.margin'>
        <p style="color: #62697D;">{{ post.content }}</p>
    </mat-card>
</div>

The issue was I was doing string interpolation instead I wanted to do is property binding all I have to do was remove curly braces

answered Jun 18, 2020 at 6:22

50_Seconds _Of_Coding

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