RouterLink

Description

Consider the following route configuration: [{ path: 'user/:name', component: UserCmp }]. When linking to this user/:name route, you use the RouterLink directive.

If the link is static, you can use the directive as follows: <a routerLink="/user/bob">link to user component</a>

If you use dynamic values to generate the link, you can pass an array of path segments, followed by the params for each segment.

For instance ['/team', teamId, 'user', userName, {details: true}] means that we want to generate a link to /team/11/user/bob;details=true.

Multiple static segments can be merged into one (e.g., ['/team/11/user', userName, {details: true}]).

The first segment name can be prepended with /, ./, or ../:

• If the first segment begins with /, the router will look up the route from the root of the app.
• If the first segment begins with ./, or doesn't begin with a slash, the router will instead look in the children of the current activated route.
• And if the first segment begins with ../, the router will go up one level.

You can set query params and fragment as follows:

      
        content_copy
      
      <a [routerLink]="['/user/bob']" [queryParams]="{debug: true}" fragment="education">
  link to user component
</a>
    

RouterLink will use these to generate this link: /user/bob#education?debug=true.

(Deprecated in v4.0.0 use queryParamsHandling instead) You can also tell the directive to preserve the current query params and fragment:

      
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      <a [routerLink]="['/user/bob']" preserveQueryParams preserveFragment>
  link to user component
</a>
    

You can tell the directive how to handle queryParams. Available options are:

• 'merge': merge the queryParams into the current queryParams
• 'preserve': preserve the current queryParams
• default/'': use the queryParams only

Same options for NavigationExtras#queryParamsHandling.

      
        content_copy
      
      <a [routerLink]="['/user/bob']" [queryParams]="{debug: true}" queryParamsHandling="merge">
  link to user component
</a>
    

You can provide a state value to be persisted to the browser's History.state property (See https://developer.mozilla.org/en-US/docs/Web/API/History#Properties). It's used as follows:

      
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      <a [routerLink]="['/user/bob']" [state]="{tracingId: 123}">
  link to user component
</a>
    

And later the value can be read from the router through router.getCurrentNavigation. For example, to capture the tracingId above during the NavigationStart event:

      
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      // Get NavigationStart events
router.events.pipe(filter(e => e instanceof NavigationStart)).subscribe(e => {
  const navigation = router.getCurrentNavigation();
  tracingService.trace({id: navigation.extras.state.tracingId});
});
    

The router link directive always treats the provided input as a delta to the current url.

For instance, if the current url is /user/(box//aux:team).

Then the following link <a [routerLink]="['/user/jim']">Jim</a> will generate the link /user/(jim//aux:team).

See createUrlTree for more information.