[Solved] You want to create a navigation link that goes to a user detail page with a dynamic user ID, but only if the ID... Which is the best way to use RouterLink in the template to handle this condition? | Angular

Angular - Routing

You want to create a navigation link that goes to a user detail page with a dynamic user ID, but only if the ID is valid (non-null). Which is the best way to use RouterLink in the template to handle this condition?

A<a [routerLink]="userId ? ['/user', userId] : ['/user']">User Details</a>

B<a *ngIf="userId" [routerLink]="['/user', userId]">User Details</a>

C<a [routerLink]="['/user', userId || 'default']">User Details</a>

D<a [routerLink]="/user/{{userId}}">User Details</a>

Step-by-Step Solution

Solution:

Step 1: Understand conditional RouterLink binding
<a [routerLink]="userId ? ['/user', userId] : ['/user']">User Details</a> uses a ternary operator inside the binding to choose the path based on userId validity, which is clean and safe.
Step 2: Evaluate other options
<a *ngIf="userId" [routerLink]="['/user', userId]">User Details</a> hides the link if userId is falsy, which may be okay but removes the link entirely. <a [routerLink]="['/user', userId || 'default']">User Details</a> uses a fallback string which might not be desired. <a [routerLink]="/user/{{userId}}">User Details</a> uses interpolation inside the binding expression, which is invalid template syntax.
Final Answer:
<a [routerLink]="userId ? ['/user', userId] : ['/user']">User Details</a> -> Option A
Quick Check:
Use ternary inside binding for conditional paths [OK]

Quick Trick: Use ternary operator inside [routerLink] for conditions [OK]

Common Mistakes:

MISTAKES

Using interpolation inside routerLink attribute
Hiding link instead of changing path
Using fallback strings that may confuse routing

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Which is the best way to use RouterLink in the template to handle this condition?

Step 1: Understand conditional RouterLink binding

Step 2: Evaluate other options

Final Answer:

Quick Check:

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