The utilization of conditional expression necessitates the inclusion of all three expressions at the conclusion

<div *ngFor="let f of layout?.photoframes; let i = index" [attr.data-index]="i">
   <input type="number" [(ngModel)]="f.x" [style.border-color]="(selectedObject===f) ? 'red'"  />
</div>

An error is triggered by the conditional style.

The conditional expression (selectedObject===f) ? 'red' requires all 3 expressions at the end of the expression [(selectedObject===f) ? 'red']. What can be done to fix this?

Answer №1

Don't forget to include the outcome for the scenario where the condition evaluates to false. This means you must provide the appropriate ternary operator

Think of it as a if/else statement. If the condition is true, return red; otherwise, return blue.

(selectedObject === f) ? 'red' : 'blue'

Answer №2

While this pertains to a distinct scenario, in the realm of Angular, encountering an error message when using a pipe ( | ) within your view may necessitate enclosing said pipe within parentheses like so:

<input value={{device.id ? (device.id | decimalToHex) : ''}}>

If you omit the parentheses as shown below:

<input value={{device.id ? device.id | decimalToHex : ''}}>

You will encounter an error.

Answer №3

To fix the issue, simply delete the '?' symbol from the code line "layout?.photoframes".

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