{"id":5704,"date":"2019-12-12T16:09:41","date_gmt":"2019-12-12T10:39:41","guid":{"rendered":"https:\/\/www.innovationm.com\/blog\/?p=5704"},"modified":"2023-01-20T18:55:26","modified_gmt":"2023-01-20T13:25:26","slug":"mobx-in-react","status":"publish","type":"post","link":"https:\/\/www.innovationm.com\/blog\/mobx-in-react\/","title":{"rendered":"MobX in React"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">MobX is the new upcoming state management solution. This blog is all about how to create a simple React-Native app using MobX.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">MobX is fast in speed than Redux, its easier to learn &amp; requires less boilerplate code.<\/span><\/p>\n<p><strong>Here are some of its main concepts<\/strong><\/p>\n<p><strong>Stores:<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Stores create data sources. A store is basically an ES6 class.\u00a0 \u00a0the state is automatically derived from a data source by MobX by using ES6 decorators.<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The store can expose the\u00a0<\/span><span style=\"font-weight: 400;\">observable<\/span><span style=\"font-weight: 400;\"> field(s), to which an <\/span><span style=\"font-weight: 400;\">observer<\/span><span style=\"font-weight: 400;\"> can react.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The store can additionally expose some derived <\/span><span style=\"font-weight: 400;\">observable<\/span><span style=\"font-weight: 400;\"> fields too. Which are pure functions on <\/span><span style=\"font-weight: 400;\">observable<\/span><span style=\"font-weight: 400;\"> fields? MobX calls them as <\/span><span style=\"font-weight: 400;\">computed<\/span><span style=\"font-weight: 400;\"> fields.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The store can also change the values of <\/span><span style=\"font-weight: 400;\">observable<\/span><span style=\"font-weight: 400;\"> fields via <\/span><span style=\"font-weight: 400;\">actions<\/span><span style=\"font-weight: 400;\">. Only in this way MobX can allow you to change state.<\/span><\/li>\n<\/ol>\n<p><strong>MobX has some core concepts:<\/strong><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Observables<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Computed Values<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Reactions<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Actions<\/span><\/li>\n<\/ul>\n<h3><strong>Observables:<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Observables extend functionality to subscribe to their changes.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">We can list down our class properties with @observable decorator &amp; using observers, check their values.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">These observers will be updated accordingly every time the values will change.<\/span><\/p>\n<h3><strong>Computed values:<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Computed values are derived from observables. These values will be automatically updated when the observables will change.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It should be kept in mind that, \u2018computed\u2019 has to be observed in order to be updated<\/span><\/p>\n<h3><strong>Reactions:<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Reactions are identical to computed values, but they are used to produce side-effects instead of returning new value (patching DOM, making network requests, etc.).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">MobX provides 3 reaction functions <\/span><span style=\"font-weight: 400;\"><a href=\"https:\/\/mobx.js.org\/refguide\/when.html\">when<\/a><\/span><span style=\"font-weight: 400;\">\u00a0<\/span><a href=\"https:\/\/mobx.js.org\/refguide\/autorun.html\"><span style=\"font-weight: 400;\">autorun<\/span><\/a><span style=\"font-weight: 400;\"> and <\/span><a href=\"https:\/\/mobx.js.org\/refguide\/reaction.html\"><span style=\"font-weight: 400;\">reaction<\/span><\/a><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><strong>When\u00a0<\/strong><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">when it takes two functions: predicate and effect. It executes and checks predicate until it returns <\/span><span style=\"font-weight: 400;\">true<\/span><span style=\"font-weight: 400;\">, and then executes the <\/span><span style=\"font-weight: 400;\">effect<\/span><span style=\"font-weight: 400;\"> function. After that, it disposes and stops reacting checked property.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><strong>Autorun\u00a0<\/strong><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">autorun is used in specific cases where you want a reactive function that will get fired every time the checked value is updated. Unlike <\/span><span style=\"font-weight: 400;\">computed<\/span><span style=\"font-weight: 400;\"> it doesn\u2019t have to be checked itself.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><strong>Reaction\u00a0<\/strong><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">the reaction is like autorun but gives you more control over what properties to check. It takes two functions, namely data-function and side-effect-function. data-function is observed and returns data that is used in side-effect-function.<\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-5707\" src=\"https:\/\/www.innovationm.com\/blog\/wp-content\/uploads\/2019\/12\/MObx-300x167.png\" alt=\"\" width=\"573\" height=\"319\" srcset=\"https:\/\/www.innovationm.com\/blog\/wp-content\/uploads\/2019\/12\/MObx-300x167.png 300w, https:\/\/www.innovationm.com\/blog\/wp-content\/uploads\/2019\/12\/MObx-768x427.png 768w, https:\/\/www.innovationm.com\/blog\/wp-content\/uploads\/2019\/12\/MObx-1024x569.png 1024w, https:\/\/www.innovationm.com\/blog\/wp-content\/uploads\/2019\/12\/MObx-624x347.png 624w, https:\/\/www.innovationm.com\/blog\/wp-content\/uploads\/2019\/12\/MObx.png 1141w\" sizes=\"(max-width: 573px) 100vw, 573px\" \/><\/p>\n<p><i><span style=\"font-weight: 400;\">Fig. 1.1: The MobX lifecycle<\/span><\/i><\/p>\n<h3><strong>Actions:<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Actions are responsible for altering the state.we can use them to explicitly mark that function with <\/span><span style=\"font-weight: 400;\">@action<\/span><span style=\"font-weight: 400;\"> decorator.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This decorator takes a function and wraps it into a\u00a0<\/span><span style=\"font-weight: 400;\">transaction<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">untracked<\/span><span style=\"font-weight: 400;\"> and allows state changes<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><strong>Transaction\u00a0<\/strong><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">the transaction is used to batch together updates in the state so until &amp; unless that function is completed, no observers will be notified. So we can update various properties at once.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><strong>Untracked\u00a0<\/strong><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">With the help of untracked, we can run code without establishing observers (just like reactions, or unlike computed\u2019s)<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><strong>Allow State Changes\u00a0<\/strong><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">allow state changes is used to allow or reject state changes for certain functions. By default allows an\u00a0<\/span><span style=\"font-weight: 400;\">action<\/span><span style=\"font-weight: 400;\"> to make changes (and disallows for <\/span><span style=\"font-weight: 400;\">computed<\/span><span style=\"font-weight: 400;\"> and <\/span><span style=\"font-weight: 400;\">observer<\/span><span style=\"font-weight: 400;\">).<\/span><\/p>\n<h2><strong>Observers:<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Honestly,\u00a0 <\/span><span style=\"font-weight: 400;\">observers<\/span><span style=\"font-weight: 400;\"> aren\u2019t part of MobX core. They are provided by the <\/span><span style=\"font-weight: 400;\">mobx-react<\/span><span style=\"font-weight: 400;\"> package. They are used to enable views to \u201cobserve\u201d <\/span><span style=\"font-weight: 400;\">observables<\/span><span style=\"font-weight: 400;\"> and re-render on change.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Let\u2019s explore a simple ValueStore. It provides an observable field named count value and actions <\/span><span style=\"font-weight: 400;\">increase_value<\/span><span style=\"font-weight: 400;\"> and <\/span><span style=\"font-weight: 400;\">decrease_value<\/span><span style=\"font-weight: 400;\"> to change the value.<\/span><\/p>\n<pre class=\"lang:js decode:true\">\/\/ @ flow\r\n\r\nimport {observable,action} from \u201cmobx\u201d;\r\n\r\nclass ValueStore{\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0@observable countValue=0;\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0@action increase_value()={\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this.countValue+=1;\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0@action decrease_value()={\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this.countValue-=1;\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\r\n\r\n}\r\n\r\nexport default ValueStore;<\/pre>\n<p><span style=\"font-weight: 400;\">Here is a look at a component that keeps track of count value and re-renders every time the count value gets changed.<\/span><\/p>\n<pre class=\"lang:js decode:true\">\/\/ RN imports\r\n\r\nimport { observer, inject } from \"mobx-react\";\r\n\r\n@inject(\"valueStore\")\r\n\r\n@observer\r\n\r\nclass Counter extends Component {\r\n\r\n\u00a0\u00a0render() {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return &lt;Text&gt;Count:\u00a0 {this.props.valueStore.count}&lt;\/Text&gt;;\r\n\r\n\u00a0\u00a0}\r\n\r\n}<\/pre>\n<p><span style=\"font-weight: 400;\">By decorating class with <\/span><span style=\"font-weight: 400;\">@observer,<\/span><span style=\"font-weight: 400;\"> MobX can infer reactions to the changes in store &amp; automatically subscribe to them and re-render component on getting changes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0<\/span><span style=\"font-weight: 400;\">@inject<\/span><span style=\"font-weight: 400;\"> is a MobX decorator that will provide component props with the mentioned store.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">MobX provides a React Provider that can be made as a parent component for all the components of your application. A MobX provider should be initialized with all the stores that you may want to be injected into your components.<\/span><\/p>\n<pre class=\"lang:js decode:true\">import { Provider } from \"mobx-react\";\r\n\r\nclass App extends Component {\r\n\r\n\u00a0\u00a0render() {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0return (\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0&lt;Provider {counterStore: new ValueStore(), userStore:\u00a0 \u00a0 \u00a0 new UserStore()}&gt;\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0&lt;Home \/&gt;\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0&lt;\/Provider&gt;\r\n\r\n\u00a0\u00a0\u00a0\u00a0);\r\n\r\n\u00a0}\r\n\r\n}\r\n\r\nexport default App;<\/pre>\n<p><span style=\"font-weight: 400;\"><br \/>\nNow, all children of the Home component can be injected with value stores and user stores.<\/span><\/p>\n<p>InnovationM is a globally renowned\u00a0<a href=\"https:\/\/www.innovationm.com\/android-app-development\">Android app development company in Delhi NCR<\/a> that caters to a strong &amp; secure Android app development, iOS app development, hybrid app development services. Our commitment &amp; engagement towards our target gives us brighter in the world of technology and has led us to establish success stories consecutively which makes us the best\u00a0<a href=\"https:\/\/www.innovationm.com\/ios-app-development\">iPhone app development company in Delhi NCR<\/a>.<\/p>\n<p>Thanks for giving your valuable time. Keep reading and keep learning &#x1f642;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MobX is the new upcoming state management solution. This blog is all about how to create a simple React-Native app using MobX. MobX is fast in speed than Redux, its easier to learn &amp; requires less boilerplate code. Here are some of its main concepts Stores: Stores create data sources. A store is basically an [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5708,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[360,257],"tags":[422,423,346,421,427,424,425,247,426,314],"class_list":["post-5704","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","category-react","tag-how-to-use-mobx-in-react","tag-how-to-use-mobx-with-react-hooks","tag-javascript","tag-js","tag-mobx-in-react","tag-mobx-react","tag-mobx-react-native","tag-react","tag-react-native-mobx","tag-reactjs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>MobX in React - InnovationM - Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.innovationm.com\/blog\/mobx-in-react\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MobX in React - InnovationM - Blog\" \/>\n<meta property=\"og:description\" content=\"MobX is the new upcoming state management solution. This blog is all about how to create a simple React-Native app using MobX. MobX is fast in speed than Redux, its easier to learn &amp; requires less boilerplate code. Here are some of its main concepts Stores: Stores create data sources. 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This blog is all about how to create a simple React-Native app using MobX. MobX is fast in speed than Redux, its easier to learn &amp; requires less boilerplate code. Here are some of its main concepts Stores: Stores create data sources. 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