Manipulating the distinct look of the final element in an *ngFor loop

Question

Manipulating the distinct look of the final element in an *ngFor loop

I am trying to enhance the appearance of the last line of controls generated by an iterator by making it disabled and somewhat invisible. Currently, my code is functioning well, as shown below.

<div *ngFor="let item of data; let last = last;">

  <input class="form-control"
        [value]="item.e"
        [disabled]="last">

  <button (click)="onRemove(item)"
          class="btn btn-outline-danger"
          [style.visibility]="last?'hidden':''">Do</button>

</div>

I want to improve the quality of my code, particularly the management of visibility aspect. The disability setting looks good, but the visibility conditional seems cumbersome.

What would be a better way to handle visibility control in a more elegant manner?

I attempted the following approach, but it did not work.

<button (click)="onRemove(item)"
        class="btn btn-outline-danger"
        [style.visibility.hidden]="last">Do</button>

html css angular

Answer 1

Answer №1

If you're looking to hide an item, consider creating a CSS class specifically for that purpose.

.hidden {
  display: none;
}

Then, use this class based on certain conditions.

<button (click)="onRemove(item)" 
        class="btn btn-outline-danger"
        [class.hidden]="last">
</button>

You can see an example in action at this stackblitz link.

Answer 2

If you're looking to hide an item, consider creating a CSS class specifically for that purpose.

.hidden {
  display: none;
}

Then, use this class based on certain conditions.

<button (click)="onRemove(item)" 
        class="btn btn-outline-danger"
        [class.hidden]="last">
</button>

You can see an example in action at this stackblitz link.

Answer 3

Answer №2

To achieve this, you can use the syntax

[style.visibility]="last && 'hidden'"

.

Essentially, if the variable last is considered truthy, then last && 'hidden' will result in 'hidden'; otherwise, it will evaluate to a falsy value. When setting a style using [style.property], if the value is falsy, the property will not be applied.

If you want to learn more about truthy and falsy values, check out this resource. Additionally, explore how short-circuit logic can offer a more elegant way to evaluate values here.

Overall, your solution appears clean and clear, which is important for readability by other developers who may come across your code.

Answer 4

To achieve this, you can use the syntax

[style.visibility]="last && 'hidden'"

.

Essentially, if the variable last is considered truthy, then last && 'hidden' will result in 'hidden'; otherwise, it will evaluate to a falsy value. When setting a style using [style.property], if the value is falsy, the property will not be applied.

If you want to learn more about truthy and falsy values, check out this resource. Additionally, explore how short-circuit logic can offer a more elegant way to evaluate values here.

Overall, your solution appears clean and clear, which is important for readability by other developers who may come across your code.

Manipulating the distinct look of the final element in an *ngFor loop

Answer №1

Answer №2

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