{"id":701,"date":"2023-03-28T05:00:00","date_gmt":"2023-03-28T12:00:00","guid":{"rendered":"https:\/\/www.angulartraining.com\/daily-newsletter\/?p=701"},"modified":"2023-03-24T15:01:48","modified_gmt":"2023-03-24T22:01:48","slug":"resolver-function-for-the-angular-router","status":"publish","type":"post","link":"https:\/\/www.angulartraining.com\/daily-newsletter\/resolver-function-for-the-angular-router\/","title":{"rendered":"Resolver function for the Angular Router"},"content":{"rendered":"\n

The last router function of our guard series<\/a> is resolve<\/a><\/code>. It is the replacement for class-based resolvers. A resolver function runs after <\/strong>all guards have run and before <\/strong>the destination component is rendered. Such a function is typically used to preload component data before rendering it on the screen.<\/p>\n\n\n\n

For instance, in this example:<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

heroResolver<\/code> is a function that returns either some data or a Promise<\/code> or an Observable<\/code> of that data. Such data will be stored in the hero<\/code> property of a data<\/code> object returned by an Observable from the ActivatedRoute<\/code> service as follows:<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

<\/p>\n\n\n\n

Of course, we could resolve multiple different pieces of data using the following syntax: <\/p>\n\n\n

resolve: {user<\/span>: userResolver, session<\/span>: sessionResolver},<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
export<\/span> const<\/span> userResolver: ResolveFn<User> = ()<\/span> =><\/span> { \n    return<\/span> inject(UserService).getCurrentUser(); \n };<\/code><\/span>Code language:<\/span> TypeScript<\/span> (<\/span>typescript<\/span>)<\/span><\/small><\/pre>\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
The last router function of our guard series is resolve. It is the replacement for class-based resolvers. A resolver function runs after all guards have run and before the destination component is rendered. Such a function is typically used to preload component data before rendering it on the screen. For instance, in this example: heroResolver […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,25],"tags":[],"class_list":["post-701","post","type-post","status-publish","format-standard","hentry","category-angular","category-routing"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts\/701","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/comments?post=701"}],"version-history":[{"count":11,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts\/701\/revisions"}],"predecessor-version":[{"id":720,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts\/701\/revisions\/720"}],"wp:attachment":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/media?parent=701"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/categories?post=701"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/tags?post=701"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
A resolver function can use the inject<\/code> function<\/a> to use services and resolve data as follows:<\/p>\n\n\n