{"id":646,"date":"2023-03-13T05:00:00","date_gmt":"2023-03-13T12:00:00","guid":{"rendered":"https:\/\/www.angulartraining.com\/daily-newsletter\/?p=646"},"modified":"2023-03-09T16:02:40","modified_gmt":"2023-03-10T00:02:40","slug":"dependency-injection-and-provider-config","status":"publish","type":"post","link":"https:\/\/www.angulartraining.com\/daily-newsletter\/dependency-injection-and-provider-config\/","title":{"rendered":"Dependency Injection and Provider Config"},"content":{"rendered":"\n

As Angular developers, we use and create services fairly often. So, in today’s post, let’s demystify the following syntax and see what the different options for it are:<\/p>\n\n\n

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

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

When a service is provided in the root injector<\/strong> (providedIn: 'root'<\/code>), it means that such a service can be injected into any component of your application, and that service will be a singleton shared by all consumers in your application.<\/p>\n\n\n\n

If we want to restrict the scope of a service, we can provide it in a module <\/strong>or a component <\/strong>instead of the root injector. The syntax looks like this – we use the class name of the targeted module or component:<\/p>\n\n\n

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

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

When a service is provided in a module, only the components\/directives\/pipes\/services of that module can inject that service. However, when provided in a component, that component and its children<\/strong> can inject that service.<\/p>\n\n\n\n

From a syntax standpoint, it’s also important to mention that using providedIn<\/code> is equivalent to doing the following in a component or a module:<\/p>\n\n\n

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

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

The above code is equivalent to the following:<\/p>\n\n\n

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

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

So you only need one or the other; both would be redundant.<\/p>\n\n\n\n

Finally, there is another option available: platform<\/code>.<\/p>\n\n\n

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

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

The service would be injectable into any Angular app in the current browser tab. It’s a rare use case, but if you’re running multiple Angular applications on the same page and want to share a service between these applications, platform<\/code> is what you need.<\/p>\n\n\n\n

For more information, you can read that post of mine that covers all these options<\/a> (note: providedIn: 'any'<\/code> used to be an option but is now deprecated, which is why I didn’t mention it)<\/p>\n","protected":false},"excerpt":{"rendered":"

As Angular developers, we use and create services fairly often. So, in today’s post, let’s demystify the following syntax and see what the different options for it are: When a service is provided in the root injector (providedIn: ‘root’), it means that such a service can be injected into any component of your application, and […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,26],"tags":[],"class_list":["post-646","post","type-post","status-publish","format-standard","hentry","category-angular","category-dependency-injection"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts\/646","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=646"}],"version-history":[{"count":3,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts\/646\/revisions"}],"predecessor-version":[{"id":655,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/posts\/646\/revisions\/655"}],"wp:attachment":[{"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/media?parent=646"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/categories?post=646"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-json\/wp\/v2\/tags?post=646"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}